SBAS533E March   2011  – February 2023 ADS4222 , ADS4225 , ADS4226 , ADS4242 , ADS4245 , ADS4246

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions – LVDS Mode
    2.     Pin Functions – CMOS Mode
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: ADS4246, ADS4245, ADS4242
    6. 7.6  Electrical Characteristics: ADS4226, ADS4225, ADS4222
    7. 7.7  Electrical Characteristics: General
    8. 7.8  Digital Characteristics
    9. 7.9  Timing Requirements: LVDS and CMOS Modes (1)
    10. 7.10 Serial Interface Timing Characteristics (1)
    11. 7.11 Reset Timing (Only When Serial Interface Is Used)
    12. 7.12 Typical Characteristics
      1. 7.12.1 ADS4246
      2. 7.12.2 ADS4245
      3. 7.12.3 ADS4242
      4. 7.12.4 ADS4226
      5. 7.12.5 ADS4225
      6. 7.12.6 ADS4222
      7. 7.12.7 General
      8. 7.12.8 Contour
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Analog Input
        1. 8.3.1.1 Drive Circuit Requirements
        2. 8.3.1.2 Driving Circuit
      2. 8.3.2 Clock Input
      3. 8.3.3 Digital Functions
      4. 8.3.4 Gain for SFDR/SNR Trade-off
      5. 8.3.5 Offset Correction
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down
        1. 8.4.1.1 Global Power-Down
        2. 8.4.1.2 Channel Standby
        3. 8.4.1.3 Input Clock Stop
    5. 8.5 Programming
      1. 8.5.1 47
      2. 8.5.2 Parallel Configuration Only
      3. 8.5.3 Serial Interface Configuration Only
      4. 8.5.4 Using Both Serial Interface and Parallel Controls
      5. 8.5.5 Parallel Configuration Details
      6. 8.5.6 Serial Interface Details
        1. 8.5.6.1 Register Initialization
        2. 8.5.6.2 Serial Register Readout
      7. 8.5.7 Digital Output Information
        1. 8.5.7.1 Output Interface
        2. 8.5.7.2 DDR LVDS Outputs
        3. 8.5.7.3 LVDS Buffer
        4. 8.5.7.4 Parallel CMOS Interface
        5. 8.5.7.5 CMOS Interface Power Dissipation
        6. 8.5.7.6 Multiplexed Mode of Operation
        7. 8.5.7.7 Output Data Format
    6. 8.6 Register Maps
      1. 8.6.1 64
      2. 8.6.2 Description Of Serial Registers
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Analog Input
        2. 9.2.2.2 Clock Driver
        3. 9.2.2.3 Digital Interface
        4. 9.2.2.4 SNR and Clock Jitter
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Sharing DRVDD and AVDD Supplies
      2. 9.3.2 Using DC/DC Power Supplies
      3. 9.3.3 Power Supply Bypassing
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 Grounding
        2. 9.4.1.2 Supply Decoupling
        3. 9.4.1.3 Exposed Pad
        4. 9.4.1.4 Routing Analog Inputs
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Device Nomenclature
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Pin Functions – CMOS Mode

Figure 6-3 ADS4246, ADS4245, and ADS4242
RGC Package
64-Pin VQFN With Exposed Thermal Pad
CMOS Mode (Top View)
Figure 6-4 ADS4226, ADS4225, and ADS4222
RGC Package
64-Pin VQFN With Exposed Thermal Pad
CMOS Mode (Top View)
Table 6-2 Pin Functions
PIN TYPE DESCRIPTION
NAME ADS4246, 45, 42 ADS4226, 25, 22
AGND 17, 18, 21, 24, 27, 28, 31, 32 17, 18, 21, 24, 27, 28, 31, 32 Input Analog ground
AVDD 16, 22, 33, 34 16, 22, 33, 34 Input Analog power supply
CLKM 26 26 Input Differential clock negative input
CLKOUT 57 57 Output CMOS output clock
CLKP 25 25 Input Differential clock positive input
CTRL1 35 35 Input Digital control input pins. Together, they control various power-down modes.
CTRL2 36 36 Input Digital control input pins. Together, they control various power-down modes.
CTRL3 37 37 Input Digital control input pins. Together, they control various power-down modes.
DA0 40 42 Output Channel A ADC output data bits, CMOS levels
DA1 41 43 Output Channel A ADC output data bits, CMOS levels
DA2 42 44 Output Channel A ADC output data bits, CMOS levels
DA3 43 45 Output Channel A ADC output data bits, CMOS levels
DA4 44 46 Output Channel A ADC output data bits, CMOS levels
DA5 45 47 Output Channel A ADC output data bits, CMOS levels
DA6 46 50 Output Channel A ADC output data bits, CMOS levels
DA7 47 51 Output Channel A ADC output data bits, CMOS levels
DA8 50 52 Output Channel A ADC output data bits, CMOS levels
DA9 51 53 Output Channel A ADC output data bits, CMOS levels
DA10 52 54 Output Channel A ADC output data bits, CMOS levels
DA11 53 55 Output Channel A ADC output data bits, CMOS levels
DA12 54 -- Output Channel A ADC output data bits, CMOS levels (ADS424x only)
DA13 55 -- Output Channel A ADC output data bits, CMOS levels (ADS424x only)
DB0 60 62 Output Channel B ADC output data bits, CMOS levels
DB1 61 63 Output Channel B ADC output data bits, CMOS levels
DB2 62 2 Output Channel B ADC output data bits, CMOS levels
DB3 63 3 Output Channel B ADC output data bits, CMOS levels
DB4 2 4 Output Channel B ADC output data bits, CMOS levels
DB5 3 5 Output Channel B ADC output data bits, CMOS levels
DB6 4 6 Output Channel B ADC output data bits, CMOS levels
DB7 5 7 Output Channel B ADC output data bits, CMOS levels
DB8 6 8 Output Channel B ADC output data bits, CMOS levels
DB9 7 9 Output Channel B ADC output data bits, CMOS levels
DB10 8 10 Output Channel B ADC output data bits, CMOS levels
DB11 9 11 Output Channel B ADC output data bits, CMOS levels
DB12 10 -- Output Channel B ADC output data bits, CMOS levels (ADS424x only)
DB13 11 -- Output Channel B ADC output data bits, CMOS levels (ADS424x only)
DRGND 49, PAD 49, PAD Input Output buffer ground. The Thermal PAD is connected to DRGND
DRVDD 1, 48 1, 48 Input Output buffer supply
INM_A 30 30 Input Differential analog negative input, channel A
INM_B 20 20 Input Differential analog negative input, channel B
INP_A 29 29 Input Differential analog positive input, channel A
INP_B 19 19 Input Differential analog positive input, channel B
NC 38, 39, 58, 59 38, 39, 40, 41,58, 59, 60, 61 — Do not connect, must be floated
RESET 12 12 Input Serial interface RESET input.
When using the serial interface mode, the internal registers must be initialized through a hardware RESET by applying a high pulse on this pin or by using the software reset option; refer to the Serial Interface Configuration section.
In parallel interface mode, the RESET pin must be permanently tied high. SDATA and SEN are used as parallel control pins in this mode. This pin has an internal 150-kΩ pulldown resistor.
SCLK 13 13 Input This pin functions as a serial interface clock input when RESET is low. It controls the low-speed mode when RESET is tied high; see Table 8-6 for detailed information. This pin has an internal 150-kΩ pulldown resistor.
SDATA 14 14 Input Serial interface data input; this pin has an internal 150-kΩ pulldown resistor.
SDOUT 64 64 Output This pin functions as a serial interface register readout when the READOUT bit is enabled. When READOUT = 0, this pin is in high-impedance state.
SEN 15 15 Input This pin functions as a serial interface enable input when RESET is low. It controls the output interface and data format selection when RESET is tied high; see Table 8-7 for detailed information. This pin has an internal 150-kΩ pullup resistor to AVDD.
UNUSED 56 56 — This pin is not used in the CMOS interface
VCM 23 23 Output This pin outputs the common-mode voltage (0.95 V) that can be used externally to bias the analog input pins