SBASAX3A May   2025  – September 2025 ADS9326 , ADS9327

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Thermal Information
    4. 6.4  Recommended Operating Conditions
    5. 6.5  Electrical Characteristics 
    6. 6.6  Electrical Characteristics: AVDD = 5V
    7. 6.7  Electrical Characteristics: AVDD = 3.3V
    8. 6.8  Timing Requirements
    9. 6.9  Switching Characteristics
    10. 6.10 Timing Diagrams
    11. 6.11 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Inputs
      2. 7.3.2 Reference
        1. 7.3.2.1 Internal Reference
          1. 7.3.2.1.1 Selectable Internal Reference with 5V AVDD
        2. 7.3.2.2 External Reference
        3. 7.3.2.3 External Reference With External Reference Buffer
      3. 7.3.3 ADC Transfer Function
      4. 7.3.4 Data Interface
      5. 7.3.5 Programmable Data Averaging Filter
        1. 7.3.5.1 Simple Average
          1. 7.3.5.1.1 Simple Average with Noncontinuous CONVST
        2. 7.3.5.2 Moving Average
      6. 7.3.6 CRC on Output Data Interface
      7. 7.3.7 ADC Output Data Randomizer
      8. 7.3.8 Data Frame Width
      9. 7.3.9 Daisy-Chain Mode
        1. 7.3.9.1 Daisy-Clock Mode
    4. 7.4 Device Functional Modes
      1. 7.4.1 Reset
      2. 7.4.2 Normal Operation
      3. 7.4.3 Low-Latency Mode
      4. 7.4.4 CS-CONVST Short Mode
      5. 7.4.5 Register Read Mode
      6. 7.4.6 Initialization Sequence
    5. 7.5 Programming
      1. 7.5.1 SPI Frame Length for Register Operations
      2. 7.5.2 Register Map Lock
      3. 7.5.3 Register Write
      4. 7.5.4 Register Read
  9. 8 Register Map: ADS9327
    1. 8.1 Register Bank 0
    2. 8.2 Register Bank 1
    3. 8.3 Register Bank 2
  10. 9 Register Map: ADS9326
    1. 9.1 Register Bank 0
    2. 9.2 Register Bank 1
    3. 9.3 Register Bank 2
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Analog 1VPP Sine-Cosine Encoder Interface
      2. 10.2.2 Design Requirements
      3. 10.2.3 Detailed Design Procedure
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Mechanical Data

5 Pin Configuration and Functions

Figure 5-1 VAE Package, 22-Pin VQFN (Top View)
Table 5-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
AINM_A 5 I Negative analog input for ADC A.
AINM_B 1 I Negative analog input for ADC B.
AINP_A 6 I Positive analog input for ADC A.
AINP_B 2 I Positive analog input for ADC B.
AVDD 7 P 5V or 3.3V analog power-supply pin. Connect a 1µF decoupling capacitor between pins 7 and 8.
CONVST 10 I Conversion start input pin. A CONVST falling edge starts the conversion for ADC A and ADC B.
CS 11 I Chip-select input pin; active low.
The host and device communicate when CS is low.
The data output pins go to Hi-Z when CS is high.
D0 16 O Serial communication pin: data output 0.
D1 15 O Serial communication pin: data output 1.
D2 14 O Serial communication pin: data output 2.
D3 13 O Serial communication pin: data output 3.
GND 8, 21 G Ground.
IOGND 18 G Ground for IOVDD supply. Connect to GND externally.
IOVDD 19 P Interface power-supply pin.
Connect a 0.1µF decoupling capacitor between pins 18 and 19.
REFIO 9 I/O Internal reference output. External reference input. Connect a 1µF decoupling capacitor to GND.
REF_CAP 3 O Internal reference voltage output. Connect a 1µF decoupling capacitor between pins 3 and 4.
REFM 4 G Negative reference input for the ADCs. Externally connect to the device GND.
SCLK 17 I Clock input pin for the serial interface.
SDI 12 I Serial data input pin.
This pin programs the device registers.
VCMOUT(2) 20 O Common-mode voltage output. Use VCMOUT to set the common-mode voltage at the ADC inputs. Connect a 100nF decoupling capacitor to ground.
VDD_1V8 22 P 1.8V analog power-supply pin. Connect a 1µF decoupling capacitor between pins 21 and 22.
Thermal Pad Pad P Exposed thermal pad. Connect to GND.
(1) I = Input, O = Output, I/O = Input or Output, G = Ground, P = Power.
(2) Not applicable for PADS9326VAER. Connect a 100nF decoupling capacitor to ground.