AD7738
PRODUCTION8-Channel, 8.5 kHz, 24-Bit Sigma-Delta A/D Converter
- Part Models
- 2
- 1ku List Price
- Starting From $10.97
Overview
- High Resolution ADC
- 24 Bits No Missing Codes
- 0.0015% Nonlinearity
- Optimized for Fast Channel Switching
- 18-Bits p-p Resolution (21 Bits Effective) at 500 Hz
- 16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz
- 15-Bits p-p Resolution (18 Bits Effective) at 15 kHz
- On-Chip Per Channel System Calibration
- Configurable Inputs
- 8 Single-Ended or 4 Fully Differential
- Input Ranges
- +625 mV, +1.25 V, +2.5 V, 625 mV, 1.25 V, 2.5 V
- 3-Wire Serial Interface
- SPI™, QSPI™, MICROWIRE™ and DSP Compatible
- Schmitt Trigger on Logic Inputs
- Single-Supply Operation
- 5 V Analog Supply
- 3 V or 5 V Digital Supply
- Package: 28-Lead TSSOP
The AD7738 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with a total conversion time of 117 µs (8.5 kHz channel switching) making it ideally suitable for high resolution multiplexing applications.
The AD7738 is based on a sigma-delta architecture and features up to 24 bits of no missing codes performance. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15.4 kHz conversion rate. The analog front end features 8 single-ended or 4 fully differential input channels with unipolar or bipolar 625 mV, 1.25 V and 2.5V input ranges and accepts a common mode input voltage from 200 mV above AGND to AVDD-300 mV. The multiplexer output is pinned out externally allowing the user to implement programmable gain or signal conditioning before applying the input signal to the ADC. The differential reference input features “No Reference” detect capability. The ADC also supports per channel system calibration options.
The digital serial interface can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered.
The part is specified for operation over the extended industrial temperature range of -40ºC to +105ºC and is available in 28-lead TSSOP package.
Documentation
Data Sheet 1
Application Note 11
Technical Articles 4
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7738BRUZ | 28-Lead TSSOP (4.4mm x 9.7mm) | ||
| AD7738BRUZ-REEL7 | 28-Lead TSSOP (4.4mm x 9.7mm) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 5, 2021 - 21_0035 Amkor Philippines as an Alternate Site for TSSOP_4.4 |
||
| AD7738BRUZ | PRODUCTION | |
| AD7738BRUZ-REEL7 | PRODUCTION | |
|
Feb 11, 2011 - 10_0005 Halogen Free Material Change for TSSOP Products Assembled at Amkor |
||
| AD7738BRUZ | PRODUCTION | |
| AD7738BRUZ-REEL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Evaluation Software 1
AD7732/4/8/9 Evaluation Software
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| AD7194 | PRODUCTION | 8-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA |
Tools & Simulations
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open ToolEvaluation Kits
AD7738 Evaluation Kit