AD7739:  8-Channel, 4 kHz, 24-Bit Sigma-Delta A/D Converter

The AD7739 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with a total conversion time of 250 µs (4 kHz channel switching) making it ideally ...More

AD7739:  8-Channel, 4 kHz, 24-Bit Sigma-Delta A/D Converter

Product Description

The AD7739 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with a total conversion time of 250 µs (4 kHz channel switching) making it ideally suitable for high resolution multiplexing applications.

The AD7739 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 2.5 V input ranges and accepts a common mode input voltage from 200 mV above AGND to AVDD-300 mV. The ADC 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 24-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 4 kHz
    - On-Chip Per Channel System Calibration
  • Configurable Inputs 8 Single-Ended or 4 Fully Differential
  • Input Ranges
    - +625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 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: 24-Lead TSSOP

Diagrams

AD7739 Diagram
Functional Block Diagram for AD7739

Specifications

Resolution (Bits) 24bit
T-Put Rate 15.1kSPS
# Chan 8
Supply V Single(+5)
Pwr Diss (max) 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

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Part# Res Throughput Rate # of Inputs Operating Pwr Diss
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AD7766 24 128KSPS 1 18mW
AD7767 24 128KSPS 1 18mW