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ADS922x Dual, Simultaneous-Sampling, 16-Bit, 20MSPS SAR ADCs With Fully Differential ADC Input Driver
SBASAG2C
December 2023 – March 2025
ADS9227
,
ADS9228
,
ADS9229
PRODUCTION DATA
CONTENTS
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ADS922x Dual, Simultaneous-Sampling, 16-Bit, 20MSPS SAR ADCs With Fully Differential ADC Input Driver
1
1
Features
2
Applications
3
Description
4
Device Comparison Table
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Thermal Information
6.4
Recommended Operating Conditions
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Switching Characteristics
6.8
Timing Diagrams
6.9
Typical Characteristics: All Devices
6.10
Typical Characteristics: ADS9229
6.11
Typical Characteristics: ADS9228
6.12
Typical Characteristics: ADS9227
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Analog Inputs
7.3.2
Analog Input Bandwidth
7.3.3
ADC Transfer Function
7.3.4
Reference
7.3.4.1
Internal Reference Voltage
7.3.4.2
External Reference Voltage
7.3.5
Temperature Sensor
7.3.6
Data Averaging
7.3.7
Digital Down Converter
7.3.8
Data Interface
7.3.8.1
Data Frame Width
7.3.8.2
ADC Output Data Randomizer
7.3.8.3
Synchronizing Multiple ADCs
7.3.9
Test Patterns for Data Interface
7.3.9.1
Fixed Pattern
7.3.9.2
Digital Ramp
7.3.9.3
Alternating Test Pattern
7.3.10
ADC Sampling Clock Input
7.4
Device Functional Modes
7.4.1
Reset
7.4.2
Power-Down Options
7.4.3
Normal Operation
7.4.4
Initialization Sequence
7.5
Programming
7.5.1
Register Write
7.5.2
Register Read
7.5.3
Multiple Devices: Daisy-Chain Topology for SPI Configuration
7.5.3.1
Register Write With Daisy-Chain
7.5.3.2
Register Read With Daisy-Chain
8
Register Map
8.1
Register Bank 0
8.2
Register Bank 1
8.3
Register Bank 2
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Data Acquisition (DAQ) Circuit for ≤20kHz Input Signal Bandwidth
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.3
Application Curves
9.2.2
Data Acquisition (DAQ) Circuit for ≤100kHz Input Signal Bandwidth
9.2.2.1
Design Requirements
9.2.2.2
Application Curves
9.2.3
Data Acquisition (DAQ) Circuit for ≤1MHz Input Signal Bandwidth
9.2.3.1
Design Requirements
9.2.3.2
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.2
Layout Example
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Related Documentation
10.2
Receiving Notification of Documentation Updates
10.3
Support Resources
10.4
Trademarks
10.5
Electrostatic Discharge Caution
10.6
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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Data Sheet
ADS922x Dual, Simultaneous-Sampling, 16-Bit, 20MSPS SAR ADCs With Fully Differential ADC Input Driver
1
Features
High-speed sampling rate:
20MSPS/ch
ADS9229
:
20MSPS/ch
,
230mW/ch
ADS9228
:
10MSPS/ch
,
146mW/ch
ADS9227
:
5MSPS/ch
,
95mW/ch
2-channel, simultaneous sampling
Feature integration:
Integrated ADC driver
Integrated precision reference
Common-mode voltage output buffer
High-performance:
16-bit
no missing codes
INL:
±0.3LSB
, DNL:
±0.3LSB
SNR:
93.9dB
Wide input bandwidth (–3dB):
ADS9229
and
ADS9228
: 90MHz
ADS9227
: 45MHz
Serial LVDS interface:
SDR and DDR output modes
Synchronous clock and data output
Extended operating range: –40°C to +125°C
2
Applications
Power analyzers
Source measurement units (SMU)
Marine equipment
Servo drive position feedback
DC power supplies, AC sources, electronic loads
