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ADS921x Dual, Simultaneous-Sampling, 18-Bit, 20MSPS SAR ADC With Fully Differential ADC Input Driver
SBASA74B
January 2023 – May 2024
ADS9218
,
ADS9219
PRODMIX
CONTENTS
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ADS921x Dual, Simultaneous-Sampling, 18-Bit, 20MSPS SAR ADC With Fully Differential ADC Input Driver
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: All Devices
5.10
Typical Characteristics: ADS9219
5.11
Typical Characteristics: ADS9218
5.12
Typical Characteristics: ADS9217
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Analog Inputs
6.3.2
Analog Input Bandwidth
6.3.3
ADC Transfer Function
6.3.4
Reference Voltage
6.3.5
Temperature Sensor
6.3.6
Data Averaging
6.3.7
Digital Down Converter
6.3.8
Data Interface
6.3.8.1
Data Frame Width
6.3.8.2
Synchronizing Multiple ADCs
6.3.8.3
Test Patterns for Data Interface
6.3.8.3.1
Fixed Pattern
6.3.8.3.2
Alternating Test Pattern
6.3.8.3.3
Digital Ramp
6.3.9
ADC Sampling Clock Input
6.4
Device Functional Modes
6.4.1
Reset
6.4.2
Power-Down Options
6.4.3
Normal Operation
6.4.4
Initialization Sequence
6.5
Programming
6.5.1
Register Write
6.5.2
Register Read
6.5.3
Multiple Devices: Daisy-Chain Topology for SPI Configuration
6.5.3.1
Register Write With Daisy-Chain
6.5.3.2
Register Read With Daisy-Chain
7
Register Map
7.1
Register Bank 0
7.2
Register Bank 1
7.3
Register Bank 2
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Data Acquisition (DAQ) Circuit for ≤20kHz Input Signal Bandwidth
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.3
Application Curves
8.2.2
Data Acquisition (DAQ) Circuit for ≤100kHz Input Signal Bandwidth
8.2.2.1
Design Requirements
8.2.2.2
Application Curves
8.2.3
Data Acquisition (DAQ) Circuit for ≤1MHz Input Signal Bandwidth
8.2.3.1
Design Requirements
8.2.3.2
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
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
11.1
Mechanical Data
IMPORTANT NOTICE
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Data Sheet
ADS921x Dual, Simultaneous-Sampling, 18-Bit, 20MSPS SAR ADC With Fully Differential ADC Input Driver
1
Features
High-speed and low-power:
ADS9219
:
20MSPS/ch
,
187mW/ch
ADS9218
:
10MSPS/ch
,
146mW/ch
ADS9217
:
5MSPS/ch
,
95mW/ch
2-channel, simultaneous sampling
Feature integration:
Integrated ADC driver
Integrated precision reference
Common-mode voltage output buffer
High performance:
18-bit
no-missing-codes
INL:
±1LSB
, DNL:
±0.75LSB
SNR:
95.5dB
and 104.5dB SNR with OSR = 16
Wide input bandwidth:
ADS9219
: 135MHz (–3dB)
ADS9218
: 90MHz (–3dB)
ADS9217
: 45MHz (–3dB)
Serial LVDS interface:
SDR and DDR output modes
Synchronous clock and data output
Extended operating range: –40°C to +125°C
