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  • ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters

    • SBAS556B October   2013  – August 2014 ADS7254 , ADS7854 , ADS8354

      PRODUCTION DATA.  

  • CONTENTS
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  • ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configurations and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  Handling Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: ADS8354
    6. 7.6  Electrical Characteristics: ADS7854
    7. 7.7  Electrical Characteristics: ADS7254
    8. 7.8  Electrical Characteristics: All Devices
    9. 7.9  Timing Requirements: Interface Mode
    10. 7.10 Timing Characteristics: Serial Interface
    11. 7.11 Typical Characteristics: ADS8354
    12. 7.12 Typical Characteristics: ADS7854
    13. 7.13 Typical Characteristics: ADS7254
    14. 7.14 Typical Characteristics: Common to ADS8354, ADS7854, and ADS7254
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Reference
      2. 8.3.2 Analog Inputs
        1. 8.3.2.1 Analog Input: Full-Scale Range Selection
        2. 8.3.2.2 Analog Input: Common-Mode Voltage Range
      3. 8.3.3 Transfer Function
    4. 8.4 Device Functional Modes
    5. 8.5 Register Maps and Serial Interface
      1. 8.5.1 Serial Interface
      2. 8.5.2 Write to User Programmable Registers
        1. 8.5.2.1 Configuration Register (CFR)
        2. 8.5.2.2 REFDAC Registers (REFDAC_A and REFDAC_B)
      3. 8.5.3 Data Read Operation
        1. 8.5.3.1 Reading User-Programmable Registers
        2. 8.5.3.2 Conversion Data Read
          1. 8.5.3.2.1 32-CLK, Dual-SDO Mode (CFR.B11 = 0, CFR.B10 = 0, Default)
          2. 8.5.3.2.2 32-CLK, Single-SDO Mode (CFR.B11 = 0, CFR.B10 = 1)
          3. 8.5.3.2.3 16-CLK, Dual-SDO Mode (CFR.B11 = 1, CFR.B10 = 0)
          4. 8.5.3.2.4 16-CLK, Single-SDO Mode (CFR.B11 = 1, CFR.B10 = 1)
      4. 8.5.4 Low-Power Modes
        1. 8.5.4.1 STANDBY Mode
        2. 8.5.4.2 Software Power-Down (SPD) Mode
      5. 8.5.5 Frame Abort, Reconversion, or Short-Cycling
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Input Amplifier Selection
      2. 9.1.2 Antialiasing Filter
    2. 9.2 Typical Applications
      1. 9.2.1 DAQ Circuit to Achieve Maximum SINAD for a 10-kHz Input Signal at Full Throughput
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 DAQ Circuit to Achieve Maximum SINAD for a 100-kHz Input Signal at Full Throughput
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power-Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RTE|16
    • MPQF149D
  • PW|16
    • MPDS361A
Thermal pad, mechanical data (Package|Pins)
  • RTE|16
    • QFND298F
Orderable Information
  • sbas556b_oa
  • sbas556b_pm
search No matches found.
  • Full reading width
    • Full reading width
    • Comfortable reading width
    • Expanded reading width
  • Card for each section
  • Card with all content

 

DATA SHEET

ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters

1 Features

  • 16-, 14-, and 12-Bit, Pin-Compatible Family
  • Simultaneous Sampling of Two Channels
  • Supports Fully-Differential Inputs
  • High Speed:
    • ADS8354: 16 Bits, 700 kSPS
    • ADS7854: 14 Bits, 1 MSPS
    • ADS7254: 12 Bits, 1 MSPS
  • Excellent DC Performance:
    • ADS8354:
      • 16-Bit NMC DNL, ±2.5-LSB Max INL
    • ADS7854:
      • 14-Bit NMC DNL, ±1.5-LSB Max INL
    • ADS7254:
      • 12-Bit NMC DNL, ±1-LSB Max INL
  • Excellent AC Performance:
    • ADS8354:
      • 93-dB SNR, –100-dB THD
    • ADS7854:
      • 88-dB SNR, –95-dB THD
    • ADS7254:
      • 72-dB SNR, –90-dB THD
  • Dual, Programmable, and Buffered
    2.5-V Internal Reference
  • Fully-Specified Over the Extended Industrial Temperature Range: –40°C to 125°C
  • Small Footprint:
    WQFN-16 (3-mm × 3-mm) and TSSOP-16

2 Applications

  • Motor Control:
    Position Measurement Using Encoders
  • Optical Networking: EDFA Gain Control Loops
  • Protection Relays
  • Power Quality Measurement
  • Three-Phase Power Controls
  • Programmable Logic Controllers

3 Description

The ADS8354, ADS7854, and ADS7254 belong to a family of pin-compatible, dual, high-speed, simultaneous-sampling, analog-to-digital converters (ADCs) that support fully-differential analog inputs.

Each device includes two individually programmable reference sources that can be used for system-level gain calibration. Also, a flexible serial interface that can operate over a wide power-supply range enables easy communication with a large variety of host controllers. Power consumption for a given throughput can be optimized by using the two low-power modes supported by the device. All devices are fully specified over the extended industrial temperature range (–40°C to 125°C) and are available in pin-compatible, WQFN-16 (3-mm ×
3-mm) and TSSOP-16 packages.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
ADSxx54 TSSOP (16) 5.00 mm × 4.40 mm
WQFN (16) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application Diagram

apps_fbd_556.gif

4 Revision History

Changes from A Revision (July 2014) to B Revision

  • Made changes to the ADS8354 preview device and moved to Production Data statusGo
  • Changed document status from Mixed Status to Production DataGo
  • Corrected cross-reference for Figure 98Go

Changes from * Revision (October 2013) to A Revision

  • Made changes to product preview data sheetGo

5 Device Comparison Table

PRODUCT RESOLUTION (Bits) INPUT CONFIGURATION NMC (Bits) INL (LSB) SNR (dB)
ADS8354 16 Fully-differential 16 ±2.5 93 (typ)
ADS7854 14 Fully-differential 14 ±1.5 88 (typ)
ADS7254 12 Fully-differential 12 ±1 74 (typ)
ADS8353 16 Single-ended and
pseudo-differential		 16 ±2.5 89 (typ)
ADS7853 14 Single-ended and
pseudo-differential		 14 ±2 84 (typ)
ADS7253 12 Single-ended and
pseudo-differential		 12 ±1 73.5 (typ)

6 Pin Configurations and Functions

RTE Package
WQFN-16
(Top View)
po_qfn16_bas556.gif
PW Package
TSSOP-16
(Top View)
po_tssop16_bas584.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
TSSOP WQFN
AINM_A 2 16 Analog input Negative analog input, channel A
AINM_B 7 5 Analog input Negative analog input, channel B
AINP_A 1 15 Analog input Positive analog input, channel A
AINP_B 8 6 Analog input Positive analog input, channel B
AVDD 16 14 Supply Supply voltage for ADC operation
CS 11 9 Digital input Chip-select signal; active low
DVDD 9 7 Digital I/O supply Digital I/O supply
GND 15 13 Supply Digital ground
REFGND_A 4 2 Supply Reference ground potential A
REFGND_B 5 3 Supply Reference ground potential B
REFIO_A 3 1 Analog input/output Reference voltage input/output, channel A
REFIO_B 6 4 Analog input/output Reference voltage input/output, channel B
SCLK 12 10 Digital input Clock for serial communication
SDI 10 8 Digital input Data input for serial communication
SDO_A 13 11 Digital output Data output for serial communication, channel A and channel B
SDO_B 14 12 Digital output Data output for serial communication, channel B
Thermal pad — Thermal pad Supply Exposed thermal pad (only for WQFN). TI recommends connecting this pin to the printed circuit board (PCB) ground.

7 Specifications

7.1 Absolute Maximum Ratings(1)

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
AVDD to REFGND_x or DVDD to GND –0.3 6 V
Analog (AINP_x and AINM_x) and reference input (REFIO_x) voltage with respect to REFGND_x REFGND_x – 0.3 AVDD + 0.3 V
Digital input voltage with respect to GND GND – 0.3 DVDD + 0.3 V
Ground voltage difference |REFGND_x-GND| 0.3 V
Input current to any pin except supply pins ±10 mA
Maximum virtual junction temperature, TJ 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –65 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –2000 2000 V
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) –500 500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
AVDD Analog supply voltage 5 V
DVDD Digital supply voltage 3.3 V

7.4 Thermal Information

THERMAL METRIC(1) ADS8354, ADS7854, ADS7254 UNIT
RTE (WQFN) PW (TSSOP)
16 PINS 16 PINS
RθJA Junction-to-ambient thermal resistance 33.3 86.9 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 29.5 21
RθJB Junction-to-board thermal resistance 7.3 39.1
ψJT Junction-to-top characterization parameter 0.2 0.8
ψJB Junction-to-board characterization parameter 7.4 38.4
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.9 N/A
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics: ADS8354

All minimum and maximum specifications are at TA = –40°C to 125°C, AVDD = 5 V, DVDD = 3.3 V, VREF_A = VREF_B = VREF = 2.5 V (internal), and fDATA = 700 kSPS, unless otherwise noted.
Typical values are at TA = 25°C, AVDD = 5 V, and DVDD = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RESOLUTION
Resolution 16 Bits
DC ACCURACY(2)
NMC No missing codes 32-clock mode 16 Bits
INL Integral nonlinearity 32-clock mode –2.5 ±1 2.5 LSB
DNL Differential nonlinearity 32-clock mode –0.99 ±0.7 2 LSB
EIO Input offset error –1 ±0.5 1 mV
EIO match ADC_A to ADC_B –1 ±0.5 1 mV
dEIO/dT Input offset thermal drift ±1 μV/°C
EG Gain error Referenced to the voltage at REFIO_x –0.1 ±0.05 0.1 %FS
EG match ADC_A to ADC_B –0.1 ±0.05 0.1 %FS
dEG/dT Gain error thermal drift Referenced to the voltage at REFIO_x ±1 ppm/°C
CMRR Common-mode rejection ratio Both ADCs, dc to 20 kHz 70 dB
AC ACCURACY(1)
SINAD Signal-to-noise + distortion VREF = 2.5 V,
±VREF input range, 32-clock mode		 88.6 dB
VREF = 2.5 V,
±2 × VREF input range, 32-clock mode		 88.4 dB
VREF = 5 V (external),
±VREF input range, 32-clock mode		 92.2 dB
SNR Signal-to-noise ratio VREF = 2.5 V,
±VREF input range, 32-clock mode		 89 dB
VREF = 2.5 V,
±2 × VREF input range, 32-clock mode		 89 dB
VREF = 5 V (external),
±VREF input range, 32-clock mode		 93 dB
THD Total harmonic distortion VREF = 2.5 V,
±VREF input range, 32-clock mode		 –99 dB
VREF = 2.5 V,
±2 × VREF input range, 32-clock mode		 –97.5 dB
VREF = 5 V (external),
±VREF input range, 32-clock mode		 –100 dB
SFDR Spurious-free dynamic range VREF = 2.5 V,
±VREF input range, 32-clock mode		 100 dB
VREF = 2.5 V,
±2 × VREF input range, 32-clock mode		 99 dB
VREF = 5 V (external),
±VREF input range, 32-clock mode		 100 dB
ISOXT ADC-to-ADC isolation fIN = 15 kHz at 10 %FS,
fNOISE = 25 kHz at FS		 –110 dB
(1) All ac parameters are tested at –0.5 dBFS and a 20-kHz input frequency.
(2) LSB = least significant bit.

7.6 Electrical Characteristics: ADS7854

All minimum and maximum specifications are at TA = –40°C to 125°C, AVDD = 5 V, DVDD = 3.3 V, VREF_A = VREF_B = VREF = 2.5 V (internal), and fDATA = 1 MSPS, unless otherwise noted.
Typical values are at TA = 25°C, AVDD = 5 V, and DVDD = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RESOLUTION
Resolution 14 Bits
DC ACCURACY(2)
NMC No missing codes 32-clock mode 14 Bits
16-clock mode 13 Bits
INL Integral nonlinearity 32-clock mode –1.5 ±0.5 1.5 LSB
16-clock mode –2 ±0.8 2 LSB
DNL Differential nonlinearity 32-clock mode –0.99 ±0.4 1 LSB
16-clock mode –1 ±0.7 2 LSB
EIO Input offset error –1 ±0.5 1 mV
EIO match ADC_A to ADC_B –1 ±0.5 1 mV
dEIO/dT Input offset thermal drift ±1 μV/°C
EG Gain error Referenced to the voltage at REFIO_x –0.1 ±0.05 0.1 %FS
EG match ADC_A to ADC_B –0.1 ±0.05 0.1 %FS
dEG/dT Gain error thermal drift Referenced to the voltage at REFIO_x ±1 ppm/°C
CMRR Common-mode rejection ratio Both ADCs, dc to 20 kHz 70 dB
AC ACCURACY(1)
SINAD Signal-to-noise + distortion VREF = 2.5 V,
±VREF input range		 32-clock mode 81.8 83.7 dB
16-clock mode 82.9 dB
VREF = 2.5 V,
±2 × VREF input range		 32-clock mode 83.7 dB
16-clock mode 82.9 dB
VREF = 5 V (external),
±VREF input range		 32-clock mode 84.6 dB
16-clock mode 84.1 dB
SNR Signal-to-noise ratio VREF = 2.5 V,
±VREF input range		 32-clock mode 82 84 dB
16-clock mode 83.5 dB
VREF = 2.5 V,
±2 × VREF input range		 32-clock mode 84 dB
16-clock mode 83.5 dB
VREF = 5 V (external),
±VREF input range		 32-clock mode 85 dB
16-clock mode 84.5 dB
THD Total harmonic distortion VREF = 2.5 V,
±VREF input range		 32-clock mode –95 dB
16-clock mode –92 dB
VREF = 2.5 V,
±2 × VREF input range		 32-clock mode –95 dB
16-clock mode –92 dB
VREF = 5 V (external),
±VREF input range		 32-clock mode –98 dB
16-clock mode –93 dB
SFDR Spurious-free dynamic range VREF = 2.5 V,
±VREF input range		 32-clock mode 97.5 dB
16-clock mode 95 dB
VREF = 2.5 V,
±2 × VREF input range		 32-clock mode 97.5 dB
16-clock mode 95 dB
VREF = 5 V (external),
±VREF input range		 32-clock mode 99 dB
16-clock mode 95 dB
ISOXT ADC-to-ADC isolation fIN = 15 kHz at 10 %FS,
fNOISE = 25 kHz at FS		 –90 dB
(1) All ac parameters are tested at –0.5 dBFS and a 20-kHz input frequency.
(2) LSB = least significant bit.

7.7 Electrical Characteristics: ADS7254

All minimum and maximum specifications are at TA = –40°C to 125°C, AVDD = 5 V, DVDD = 3.3 V, VREF_A = VREF_B = VREF = 2.5 V (internal), and fDATA = 1 MSPS, unless otherwise noted.
Typical values are at TA = 25°C, AVDD = 5 V, and DVDD = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RESOLUTION
Resolution 12 Bits
DC ACCURACY(2)
NMC No missing codes 12 Bits
INL Integral nonlinearity –1 ±0.25 1 LSB
DNL Differential nonlinearity –0.99 ±0.25 1 LSB
EIO Input offset error –1 ±0.5 1 mV
EIO match ADC_A to ADC_B –1 ±0.5 1 mV
dEIO/dT Input offset thermal drift ±1 μV/°C
EG Gain error Referenced to the voltage at REFIO_x –0.1 ±0.05 0.1 %FS
EG match ADC_A to ADC_B –0.1 ±0.05 0.1 %FS
dEG/dT Gain error thermal drift Referenced to the voltage at REFIO_x ±1 ppm/°C
CMRR Common-mode rejection ratio Both ADCs, dc to 20 kHz 70 dB
AC ACCURACY(1)
SINAD Signal-to-noise + distortion VREF = 2.5 V,
±VREF input range		 73.4 dB
VREF = 2.5 V,
±2 × VREF input range		 72.4 73.4 dB
VREF = 5 V (external),
±VREF input range		 73.9 dB
SNR Signal-to-noise ratio VREF = 2.5 V,
±VREF input range		 73.5 dB
VREF = 2.5 V,
±2 × VREF input range		 72.5 73.5 dB
VREF = 5 V (external),
±VREF input range		 74 dB
THD Total harmonic distortion VREF = 2.5 V,
±VREF input range		 –92 dB
VREF = 2.5 V,
±2 × VREF input range		 –92 dB
VREF = 5 V (external),
±VREF input range		 –92 dB
SFDR Spurious-free dynamic range VREF = 2.5 V,
±VREF input range		 95 dB
VREF = 2.5 V,
±2 × VREF input range		 95 dB
VREF = 5 V (external),
±VREF input range		 95 dB
ISOXT ADC-to-ADC isolation fIN = 15 kHz at 10 %FS,
fNOISE = 25 kHz at FS		 –100 dB
(1) All ac parameters are tested at –0.5 dBFS and a 20-kHz input frequency.
(2) LSB = least significant bit.

7.8 Electrical Characteristics: All Devices

All minimum and maximum specifications are at TA = –40°C to 125°C, AVDD = 5 V, DVDD = 3.3 V, VREF_A = VREF_B = VREF = 2.5 V, and fDATA = maximum, unless otherwise noted.
Typical values are at TA = 25°C, AVDD = 5 V, and DVDD = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
FSR Full-scale input range (1)
(AINP_x – AINM_x)		 ±VREF range –VREF VREF V
±2 × VREF range, AVDD ≥ 2 × VREF –2 × VREF 2 × VREF V
VIN Absolute input voltage
(AINP_x and AINM_x to REFGND)		 ±VREF range 0 VREF V
±2 × VREF range, AVDD ≥ 2 × VREF 0 2 × VREF V
VCM Common-mode voltage range
(AINP_x + AINM_x) / 2		 ±VREF range (VREF / 2) – 0.1 VREF / 2 (VREF / 2) + 0.1 V
±2 × VREF range VREF – 0.1 VREF VREF + 0.1 V
Ci Input capacitance In sample mode 40 pF
In hold mode 4 pF
Ilkg(i) Input leakage current 0.1 µA
INTERNAL VOLTAGE REFERENCE
VREFOUT Reference output voltage REFDAC_x = 1FFh (default),
at 25°C		 2.495 2.500 2.505 V
VREF-match VREF_A to VREF_B matching REFDAC_x = 1FFh (default),
at 25°C		 ±1 mV
REFDAC_x resolution(4) 1.1 mV
dVREFOUT/dT Reference voltage temperature drift REFDAC_x = 1FFh (default) ±10 ppm/°C
dVREFOUT/dt Long-term stability 1000 hours 150 ppm
RO Internal reference output impedance 1 Ω
IREFOUT Reference output dc current 2 mA
CREFOUT Recommended output capacitor 10 µF
tREFON Reference output settling time For CREF = 10 μF 8 ms
VOLTAGE REFERENCE INPUT
VREF Reference voltage (input) ±VREF range 2.4 2.5 AVDD V
±2 × VREF range 2.4 2.5 AVDD / 2 V
IREF Average Reference input current Per ADC 300 μA
CREF External ceramic reference capacitance 10 μF
Ilkg(dc) DC leakage current ±0.1 μA
SAMPLING DYNAMICS
tA Aperture delay 8 ns
tA match ADC_A to ADC_B 40 ps
tAJIT Aperture jitter 50 ps
DIGITAL INPUTS(2)
VIH High-level input voltage DVDD > 2.3 V 0.7 DVDD DVDD + 0.3 V
DVDD ≤ 2.3 V 0.8 DVDD DVDD + 0.3 V
VIL Low-level input voltage DVDD > 2.3 V –0.3 0.3 DVDD V
DVDD ≤ 2.3 V –0.3 0.2 DVDD V
Input current ±10 nA
DIGITAL OUTPUTS(2)
VOH High-level output voltage IOH = 500-µA source 0.8 DVDD DVDD V
VOL Low-level output voltage IOH = 500-µA sink 0 0.2 DVDD V
POWER SUPPLY
AVDD Analog supply voltage
(AVDD to AGND)		 ±VREF range Internal reference 4.5 5.0 5.5 V
External reference: VEXT_REF < 4.5 V 4.5 5.0 5.5 V
External reference: VEXT_REF > 4.5 V VEXT_REF 5.0 5.5 V
±2 × VREF range Internal reference 5.0 5.0 5.5 V
External reference 2 × VREF_EXT 5.0 5.5 V
DVDD Digital supply voltage
(DVDD to AGND)		 1.65 5.5 V
AIDD Analog supply current AVDD = 5 V, fastest throughput
internal reference		 8.5 10 mA
AVDD = 5 V, fastest throughput
external reference(3)		 7.5 mA
AVDD = 5 V, no conversion
internal reference		 5.5 7 mA
AVDD = 5 V, no conversion
external reference(3)		 4.5 mA
AVDD = 5 V, STANDBY mode
Internal Reference		 2.5 mA
AVDD = 5 V, STANDBY mode
external reference(3)		 1 mA
Power-down mode 10 50 μA
DIDD Digital supply current DVDD = 3.3 V, CLOAD = 10 pF,
fastest throughput		 0.5 mA
DVDD = 5 V, CLOAD = 10 pF
fastest throughput		 1 mA
PD Power dissipation
(normal operation)		 AVDD = 5V, fastest throughput,
internal reference		 42.5 50 mW
(1) Ideal input span, does not include gain or offset error.
(2) Specified by design; not production tested.
(3) With internal reference powered down, CFR.B6 = 0.
(4) Refer to the Reference section for more details.

7.9 Timing Requirements: Interface Mode(1)

PARAMETER ASSOCIATED FIGURES
tCLK CLOCK period Figure 1, Figure 90, Figure 91, Figure 92, Figure 93
tACQ Acquisition time Figure 90, Figure 91, Figure 92, Figure 93
tCONV Conversion time Figure 90, Figure 91, Figure 92, Figure 93
(1) These parameters are specific to the interface mode of operation. Refer to the Conversion Data Read section for more details.

7.10 Timing Characteristics: Serial Interface

PARAMETER TEST CONDITIONS ASSOCIATED FIGURES MIN TYP MAX UNIT
TIMING REQUIREMENTS
tPH_CK CLOCK high time Figure 1 0.4 0.6 tCLK
tPL_CK CLOCK low time 0.4 0.6 tCLK
fCLK CLOCK frequency 1 / tCLK MHz
tPH_CS CS high time Figure 1 40 ns
tPH_CS_SHRT CS high time after frame abort ADS8354 Figure 98 150 ns
ADS7854 100 ns
ADS7254 70 ns
tSU_CSCK Setup time: CS falling edge to SCLK falling edge Figure 1 15 ns
tD_CKCS Delay time: Last SCLK falling edge to CS rising edge 15 ns
tSU_CKDI Setup time: DIN data valid to SCLK falling edge 5 ns
tHT_CKDI Hold time: SCLK falling edge to (previous) data valid on DIN 5 ns
tPU_STDBY Power-up time from STANDBY mode Figure 95 1 µs
tPU_SPD Power-up time from SPD mode With internal reference Figure 97 3 ms
With external reference 1 ms
TIMING SPECIFICATIONS
tTHROUGHPUT Throughput time ADS8354 32-CLK mode Figure 90, Figure 91 1.425 µs
ADS7854 32-CLK mode 1 µs
16-CLK mode Figure 92, Figure 93 1 µs
ADS7254 32-CLK mode Figure 90, Figure 91 1 µs
16-CLK mode Figure 92, Figure 93 1 µs
fTHROUGHPUT Throughput Figure 90, Figure 91, Figure 92, Figure 93 1 / tTHROUGHPUT kSPS
tDV_CSDO Delay time: CS falling edge to data enable Figure 1 12 ns
tDZ_CSDO Delay time: CS rising edge to data going to 3-state 12 ns
tD_CKDO Delay time: SCLK falling edge to next data valid 20 ns

Figure 1 shows the details of the serial interface between the device and the digital host controller.

tim_generic_bas556.gifFigure 1. Serial Interface Timing Diagram

7.11 Typical Characteristics: ADS8354

At TA = 25°C, AVDD = 5 V, DVDD = 3.3 V, VREF = 2.5 V (internal), and fDATA = 700 kSPS, unless otherwise noted.
C201_SBAS556.png
fIN = 20 kHz SNR = 89.5 dB THD = –100 dB
Figure 2. Typical FFT
C203_SBAS556.png
fIN = 2 kHz
Figure 4. SNR vs Temperature
C205_SBAS556.png
fIN = 2 kHz
Figure 6. SNR vs Reference Voltage
C207_SBAS556.png
VREF = 5 V
Figure 8. SNR vs Input Frequency
C209_SBAS556.png
fIN = 2 kHz
Figure 10. THD vs Temperature
C213_SBAS556.png
VREF = 5 V
Figure 12. THD vs Input Frequency
C224_SBAS556.png
Figure 14. Analog Supply Current vs Temperature
C216_SBAS556.png
Figure 16. Offset Error vs Temperature
C218_SBAS556.png
Figure 18. Typical DNL
C220_SBAS556.png
Figure 20. DNL vs Temperature
C222_SBAS556.png
Figure 22. DNL vs Reference Voltage
C202_SBAS556.png
fIN = 250 kHz SNR = 82.2 dB THD = –98 dB
Figure 3. Typical FFT
C204_SBAS556.png
fIN = 2 kHz
Figure 5. SINAD vs Temperature
C206_SBAS556.png
fIN = 2 kHz
Figure 7. SINAD vs Reference Voltage
C208_SBAS556.png
VREF = 5 V
Figure 9. SINAD vs Input Frequency
C211_SBAS556.png
fIN = 2 kHz
Figure 11. THD vs Reference Voltage
C215_SBAS556.png
65536 data points VIN-DIFF = 0 V
Figure 13. DC Histogram
C226_SBAS556.png
Figure 15. Analog Supply Current vs SCLK Frequency
C217_SBAS556.png
Figure 17. Gain Error vs Temperature
C219_SBAS556.png
Figure 19. Typical INL
C221_SBAS556.png
Figure 21. INL vs Temperature
C223_SBAS556.png
Figure 23. INL vs Reference Voltage

7.12 Typical Characteristics: ADS7854

At TA = 25°C, AVDD = 5 V, DVDD = 3.3 V, VREF = 2.5 V (internal), and fDATA = 1 MSPS, unless otherwise noted.
C001_SBAS556.png
fIN = 2 kHz SNR = 83.8 dB THD = –96.1 dB
16-CLK interface
Figure 24. Typical FFT
C051_SBAS556.png
fIN = 2 kHz SNR = 84.9 dB THD = –98.7 dB
32-CLK interface
Figure 26. Typical FFT
C003_SBAS556.png
fIN = 2 kHz
Figure 28. SNR vs Temperature
C005_SBAS556.png
fIN = 2 kHz
Figure 30. SNR vs Reference Voltage
C007_SBAS556.png
VREF = 5 V
Figure 32. SNR vs Input Frequency
C009_SBAS556.png
fIN = 2 kHz
Figure 34. THD vs Temperature
C013_SBAS556.png
VREF = 5 V
Figure 36. THD vs Input Frequency
C030_SBAS556.png
16-CLK interface
Figure 38. Analog Supply Current vs SCLK Frequency
C015_SBAS556.png
16-CLK interface 65536 data points VIN-DIFF = 0 V
Figure 40. DC Histogram
C018_SBAS556.png
Figure 42. Offset Error vs Temperature
C020_SBAS556.png
16-CLK interface
Figure 44. Typical DNL
C054_SBAS556.png
32-CLK interface
Figure 46. Typical DNL
C022_SBAS556.png
Figure 48. DNL vs Temperature
C024_SBAS556.png
Figure 50. DNL vs Reference Voltage
C002_SBAS556.png
fIN = 100 kHz SNR = 83.5 dB THD = –93.1 dB
16-CLK interface
Figure 25. Typical FFT
C002_SBAS556.png
fIN = 100 kHz SNR = 84.4 dB THD = –95.1 dB
32-CLK interface
Figure 27. Typical FFT
C004_SBAS556.png
fIN = 2 kHz
Figure 29. SINAD vs Temperature
C006_SBAS556.png
fIN = 2 kHz
Figure 31. SINAD vs Reference Voltage
C008_SBAS556.png
VREF = 5 V
Figure 33. SINAD vs Input Frequency
C011_SBAS556.png
fIN = 2 kHz
Figure 35. THD vs Reference Voltage
C026_SBAS556.png
Figure 37. Analog Supply Current vs Temperature
C056_SBAS556.png
32-CLK interface
Figure 39. Analog Supply Current vs SCLK Frequency
C053_SBAS556.png
32-CLK interface 65536 data points VIN-DIFF = 0 V
Figure 41. DC Histogram
C019_SBAS556.png
Figure 43. Gain Error vs Temperature
C021_SBAS556.png
16-CLK interface
Figure 45. Typical INL
C055_SBAS556.png
32-CLK interface
Figure 47. Typical INL
C023_SBAS556.png
Figure 49. INL vs Temperature
C025_SBAS556.png
Figure 51. INL vs Reference Voltage

7.13 Typical Characteristics: ADS7254

At TA = 25°C, AVDD = 5 V, DVDD = 3.3 V, VREF = 2.5 V (internal), and fDATA = 1 MSPS, unless otherwise noted.
C101_SBAS556.png
fIN = 2 kHz SNR = 73.5 dB THD = –91.1 dB
16-CLK interface
Figure 52. Typical FFT
C151_SBAS556.png
fIN = 2 kHz SNR = 73.7 dB THD = –92 dB
32-CLK interface
Figure 54. Typical FFT
C103_SBAS556.png
fIN = 2 kHz
Figure 56. SNR vs Temperature
C105_SBAS556.png
fIN = 2 kHz
Figure 58. SNR vs Reference Voltage
C107_SBAS556.png
VREF = 5 V
Figure 60. SNR vs Input Frequency
C109_SBAS556.png
fIN = 2 kHz
Figure 62. THD vs Temperature
C113_SBAS556.png
VREF = 5 V
Figure 64. THD vs Input Frequency
C030_SBAS556.png
16-CLK interface
Figure 66. Analog Supply Current vs SCLK Frequency
C153_SBAS556.png
16-CLK interface 65536 data points VIN-DIFF = 0 V
Figure 68. DC Histogram
C116_SBAS556.png
Figure 70. Offset Error vs Temperature
C118_SBAS556.png
16-CLK interface
Figure 72. Typical DNL
C154_SBAS556.png
32-CLK interface
Figure 74. Typical DNL
C120_SBAS556.png
Figure 76. DNL vs Temperature
C122_SBAS556.png
Figure 78. DNL vs Reference Voltage
C102_SBAS556.png
fIN = 250 kHz SNR = 73.2 dB THD = –88.2 dB
16-CLK interface
Figure 53. Typical FFT
C152_SBAS556.png
fIN = 250 kHz SNR = 73.6 dB THD = –88.3 dB
32-CLK interface
Figure 55. Typical FFT
C104_SBAS556.png
fIN = 2 kHz
Figure 57. SINAD vs Temperature
C106_SBAS556.png
fIN = 2 kHz
Figure 59. SINAD vs Reference Voltage
C108_SBAS556.png
VREF = 5 V
Figure 61. SINAD vs Input Frequency
C111_SBAS556.png
fIN = 2 kHz
Figure 63. THD vs Reference Voltage
C124_SBAS556.png
Figure 65. Analog Supply Current vs Temperature
C126_SBAS556.png
32-CLK interface
Figure 67. Analog Supply Current vs SCLK Frequency
C115_SBAS556.png
32-CLK interface 65536 data points VIN-DIFF = 0 V
Figure 69. DC Histogram
C117_SBAS556.png
Figure 71. Gain Error vs Temperature
C119_SBAS556.png
16-CLK interface
Figure 73. Typical INL
C155_SBAS556.png
32-CLK interface
Figure 75. Typical INL
C121_SBAS556.png
Figure 77. INL vs Temperature
C123_SBAS556.png
Figure 79. INL vs Reference Voltage

7.14 Typical Characteristics: Common to ADS8354, ADS7854, and ADS7254

At TA = 25°C, AVDD = 5 V, DVDD = 3.3 V, VREF = 2.5 V (internal), and fDATA = maximum, unless otherwise noted.
C027_SBAS556.png
Figure 80. STANDBY Current vs Temperature
C016_SBAS556.png
Figure 82. Internal Reference Output vs Temperature
C028_SBAS556.png
Figure 81. Power-Down Current vs Temperature
C017_SBAS556.png
ROUT = 0.67 Ω
Figure 83. Internal Reference Output Impedance

 
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