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ADS816x 8-Channel, 16-Bit, 1MSPS, SAR ADC With Direct Sensor Interface
SBAS817D
November 2017 – June 2024
ADS8166
,
ADS8167
,
ADS8168
PRODUCTION DATA
CONTENTS
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ADS816x 8-Channel, 16-Bit, 1MSPS, SAR ADC With Direct Sensor Interface
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Thermal Information
5.4
Recommended Operating Conditions
5.5
Electrical Characteristics
5.6
Timing Requirements
5.7
Switching Characteristics
5.8
Timing Diagrams
5.9
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Analog Multiplexer
6.3.1.1
Multiplexer Configurations
6.3.1.2
Multiplexer With Minimum Crosstalk
6.3.1.3
Early Switching for Direct Sensor Interface
6.3.2
Reference
6.3.3
REFby2 Buffer
6.3.4
Converter Module
6.3.4.1
Internal Oscillator
6.3.4.2
ADC Transfer Function
6.3.5
Low-Dropout Regulator (LDO)
6.4
Device Functional Modes
6.4.1
Channel Selection Using Internal Multiplexer
6.4.1.1
Manual Mode
6.4.1.2
On-The-Fly Mode
6.4.1.3
Auto Sequence Mode
6.4.1.4
Custom Channel Sequencing Mode
6.4.2
Digital Window Comparator
6.5
Programming
6.5.1
Data Transfer Protocols
6.5.1.1
Enhanced-SPI Interface
6.5.1.1.1
Protocols for Configuring the Device
6.5.1.1.2
Protocols for Reading From the Device
6.5.1.1.2.1
SPI Protocols With a Single SDO
6.5.1.1.2.2
SPI Protocols With Dual SDO
6.5.1.1.2.3
Clock Re-Timer Data Transfer
6.5.1.1.2.3.1
Output Bus Width Options
6.5.2
Register Read/Write Operation
7
Register Maps
7.1
Interface and Hardware Configuration Registers
7.1.1
REG_ACCESS Register (address = 00h) [reset = 00h]
7.1.2
PD_CNTL Register (address = 04h) [reset = 00h]
7.1.3
SDI_CNTL Register (address = 008h) [reset = 00h]
7.1.4
SDO_CNTL1 Register (address = 0Ch) [reset = 00h]
7.1.5
SDO_CNTL2 Register (address = 0Dh) [reset = 00h]
7.1.6
SDO_CNTL3 Register (address = 0Eh) [reset = 00h]
7.1.7
SDO_CNTL4 Register (address = 0Fh) [reset = 00h]
7.1.8
DATA_CNTL Register (address = 10h) [reset = 00h]
7.1.9
PARITY_CNTL Register (address = 11h) [reset = 00h]
7.2
Device Calibration Registers
7.2.1
OFST_CAL Register (address = 18h) [reset = 00h]
7.2.2
REF_MRG1 Register (address = 19h) [reset = 00h]
7.2.3
REF_MRG2 Register (address = 1Ah) [reset = 00h]
7.2.4
REFby2_MRG Register (address = 1Bh) [reset = 00h]
7.3
Analog Input Configuration Registers
7.3.1
AIN_CFG Register (address = 24h) [reset = 00h]
7.3.2
COM_CFG Register (address = 27h) [reset = 00h]
7.4
Channel Sequence Configuration Registers Map
7.4.1
DEVICE_CFG Register (address = 1Ch) [reset = 00h]
7.4.2
CHANNEL_ID Register (address = 1Dh) [reset = 00h]
7.4.3
SEQ_START Register (address = 1Eh) [reset = 00h]
7.4.4
SEQ_ABORT Register (address = 1Fh) [reset = 00h]
7.4.5
ON_THE_FLY_CFG Register (address = 2Ah) [reset = 00h]
7.4.6
AUTO_SEQ_CFG1 Register (address = 80h) [reset = 00h]
7.4.7
AUTO_SEQ_CFG2 Register (address = 82h) [reset = 00h]
7.4.8
Custom Channel Sequencing Mode Registers
7.4.8.1
CCS_START_INDEX Register (address = 88h) [reset = 00h]
7.4.8.2
CCS_END_INDEX Register (address = 89h) [reset = 00h]
7.4.8.3
CCS_SEQ_LOOP Register (address = 8Ah) [reset = 00h]
7.4.8.4
CCS_CHID_INDEX_m Registers (address = 8C, 8E, 90, 92, 94, 96, 98, 9A, 9C, 9E, A0, A2, A4, A6, A8, and AAh) [reset = 00h]
7.4.8.5
REPEAT_INDEX_m Registers (address = 8D, 8F, 91, 93, 95, 97, 99, 9B, 9D, 9F, A1, A3, A5, A7, A9, and ABh) [reset = 00h]
7.5
Digital Window Comparator Configuration Registers Map
7.5.1
ALERT_CFG Register (address = 2Eh) [reset = 00h]
7.5.2
HI_TRIG_AINx[15:0] Register (address = 4Dh to 30h) [reset = 0000h]
7.5.3
LO_TRIG_AINx[15:0] Register (address = 71h to 54h) [reset = 0000h]
7.5.4
HYSTERESIS_AINx[7:0] Register (address = 4Fh to 33h) [reset = 00h]
7.5.5
ALERT_LO_STATUS Register (address = 78h) [reset = 00h]
7.5.6
ALERT_HI_STATUS Register (address = 79h) [reset = 00h]
7.5.7
ALERT_STATUS Register (address = 7Ah) [reset = 00h]
7.5.8
CURR_ALERT_LO_STATUS Register (address = 7Ch) [reset = 00h]
7.5.9
CURR_ALERT_HI_STATUS Register (address = 7Dh) [reset = 00h]
7.5.10
CURR_ALERT_STATUS Register (address = 7Eh) [reset = 00h]
8
Application and Implementation
8.1
Application Information
8.1.1
Multiplexer Input Connection
8.2
Typical Applications
8.2.1
1MSPS DAQ Circuit With Lowest Distortion and Noise Performance
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.3
Application Curve
Power Supply Recommendations
8.3
Layout
8.3.1
Layout Guidelines
8.3.1.1
Analog Signal Path
8.3.1.2
Grounding and PCB Stack-Up
8.3.1.3
Decoupling of Power Supplies
8.3.1.4
Reference Decoupling
8.3.1.5
Reference Buffer Decoupling
8.3.1.6
Multiplexer Input Decoupling
8.3.1.7
ADC Input Decoupling
8.3.1.8
Example Schematic
8.3.2
Layout Example
9
Device and Documentation Support
9.1
Documentation Support
9.1.1
Related Documentation
9.2
Receiving Notification of Documentation Updates
9.3
Support Resources
9.4
Trademarks
9.5
Electrostatic Discharge Caution
9.6
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RHB|32
MPQF130D
Thermal pad, mechanical data (Package|Pins)
RHB|32
QFND029X
Orderable Information
sbas817d_oa
sbas817d_pm
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Data Sheet
ADS816x 8-Channel, 16-Bit, 1MSPS, SAR ADC With Direct Sensor Interface
1
Features
Compact low-power data acquisition system:
MUX breakout enables single external driver amplifier
16-bit SAR ADC
Low-drift integrated reference and buffer
0.5 × V
REF
output for analog input DC biasing
Excellent AC and DC performance:
SNR: 92dB, THD: –110dB
INL: ±0.3LSB, 16-bit no missing codes
Multiplexer with channel sequencer:
Multiple channel-sequencing options:
Manual mode, on-the-fly mode, auto sequence mode, custom channel sequencing
Fast response time with on-the-fly mode
System monitoring features:
Per channel programmable window comparator
False trigger avoidance with programmable hysteresis
Enhanced-SPI digital interface:
1MSPS throughput with 16MHz SCLK
High-speed, 50MHz digital interface
Wide operating range:
External V
REF
input range: 2.5V to 5V
AVDD from 3V to 5.5V
DVDD from 1.65V to 5.5V
–40°C to +125°C temperature range
2
Applications
Chemistry, gas analyzers
Anesthesia delivery systems
Mixed modules (AI, AO, DI, DO)
Intra-DC interconnects (metro)
