SBASA81A
January 2023 – December 2023
ADS9815
,
ADS9817
PRODUCTION DATA
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
Recommended Operating Conditions
5.4
Thermal Information
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 Inputs
6.3.1.1
Input Clamp Protection Circuit
6.3.1.2
Programmable Gain Amplifier (PGA)
6.3.1.3
Wide-Common-Mode Voltage Rejection Circuit
6.3.1.4
Gain Error Calibration
6.3.2
ADC Transfer Function
6.3.3
ADC Sampling Clock Input
6.3.4
Reference
6.3.4.1
Internal Reference Voltage
6.3.4.2
External Reference Voltage
6.3.5
Sample Synchronization
6.3.6
Data Interface
6.3.6.1
Data Clock Output
6.3.6.2
ADC Output Data Randomizer
6.3.6.3
Test Patterns for Data Interface
6.3.6.3.1
User-Defined Test Pattern
6.3.6.3.2
User-Defined Alternating Test Pattern
6.3.6.3.3
Ramp Test Pattern
6.4
Device Functional Modes
6.4.1
Power-Down
6.4.2
Reset
6.4.3
Initialization Sequence
6.4.4
Normal Operation
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 Application
8.2.1
Data Acquisition (DAQ) System
8.2.2
Design Requirements
8.2.3
Detailed Design Procedure
8.2.3.1
CMOS Data Interface
8.2.4
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
Receiving Notification of Documentation Updates
9.2
Support Resources
9.3
Trademarks
9.4
Electrostatic Discharge Caution
9.5
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RSH|56
MPQF191C
Thermal pad, mechanical data (Package|Pins)
RSH|56
QFND099F
Orderable Information
sbasa81a_oa
sbasa81a_pm
1
Features
8-
channel, 18-bit ADC with analog front-end:
Dual, simultaneous sampling
: 4 × 1 channels
Constant 1-MΩ input impedance front-end
Programmable analog input ranges:
±12 V, ±10 V, ±7 V, ±5 V, ±3.5 V, and ±2.5 V
Single-ended and differential inputs
±12-V common-mode voltage range
Input overvoltage protection: Up to ±18 V
User-selectable analog input bandwidth:
21 kHz and 400 kHz
Integrated low-drift precision references
ADC reference: 4.096 V
2.5-V reference output for external circuits
Excellent AC and DC performance at full-throughput:
DNL:
±0.3 LSB
, INL:
±1.5 LSB
SNR:
92.2 dB
, THD:
–112 dB
Power supply:
Analog and digital: 5 V and 1.8 V
Digital interface: 1.2 V to 1.8 V
Temperature range: –40°C to +125°C