AD7738:  8-Channel, 8.5 kHz, 24-Bit Sigma-Delta A/D Converter

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 ...More

AD7738:  8-Channel, 8.5 kHz, 24-Bit Sigma-Delta A/D Converter

Product Description

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.

Features

  • 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

Diagrams

AD7738 Diagram
Functional Block Diagram for AD7738

Specifications

Resolution (Bits) 24bit
T-Put Rate 15.4kSPS
# Chan 8
Supply V Single(+5)
Pwr Diss 100mW
Interface Ser,SPI
Ain Range Bip 0.625,Bip 1.25,Bip 2.5V,Uni 0.625,Uni 1.25,Uni 2.5V
SNR (dB) n/a
Pkg Type SOP

AD7192 - 4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA

AD7781 - 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC

AD7949 - 14-Bit, 8-Channel, 250 kSPS PulSAR® ADC

AD7780 - 24-Bit Pin-Programmable Low Power Σ−Δ ADC

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD7738 24 15.4KSPS 8 100mW
AD7734 24 15.4KSPS 4 100mW
AD1555 24 16KSPS 2 96mW
AD7732 24 15.4KSPS 2 100mW
AD9874 24 541.5KSPS 1 79.5mW
AD7766 24 128KSPS 1 18mW
AD7767 24 128KSPS 1 18mW
AD7689 16 250KSPS 8 19.2mW
AD7949 14 250KSPS 8 13.5mW
AD7856 14 285KSPS 8 89.25mW
AD7739 24 15.1KSPS 8 100mW
Pricing, Packaging & Availability

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Package Description
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For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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