Features and Benefits
- 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
Product DetailsThe 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.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The EVAL-AD7738EBZ is a fully featured evaluation Board for the AD7738. The evaluation board can be connected to a PC via the PC COM serial port. Software is provided enabling the user to perform detailed analysis of the ADC's performance.
Documentation & Resources
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015
AN-389: Using Sigma-Delta Converters-Part 22/14/2015
AN-388: Using Sigma-Delta Converters-Part 12/14/2015
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002
AN-283: Sigma-Delta ADCs and DACs9/24/2002
AN-626: Using the AD7732/AD7734/AD7738/AD7739 Checksum Register (Rev. 0)1/1/2000
AN-663: AD7732/AD7734/AD7738/AD7739 Calibration Registers (Rev. 0)1/1/2000
AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power Applications (Rev. 0)1/1/2000
Designing Power Supplies for High Speed ADC2/1/2012
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter1/12/2006
Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs6/1/2002
Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs10/1/2001
Software & Systems Requirements
Tools & Simulations
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.
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.