AD7779
Info : RECOMMENDED FOR NEW DESIGNS
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AD7779

8-Channel, 24-Bit, 16 kSPS Simultaneous Sampling ADC

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $7.90
Features
  • 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC)
  • Single-ended or true differential inputs
  • Programmable gain amplifier (PGA) per channel (gains of 1, 2, 4, and 8)
  • Low dc input current
    • ±1.5 nA (differential)
    • ±4 nA (single-ended)
  • Up to 16 kSPS output data rate (ODR) per channel
  • Programmable ODRs and bandwidth
  • Sample rate converter (SRC) for coherent sampling
    • Sampling rate resolution up to 15.2 µSPS
  • Low latency sinc3 filter path
  • Adjustable phase synchronization
  • Internal 2.5 V reference
  • Two power modes optimizing power dissipation and performance: high resolution mode and low power mode
  • Low resolution successive approximation (SAR) ADC for system and chip diagnostics
  • Power supply
    • Bipolar (±1.65 V) or unipolar (3.3 V) supplies
    • Digital input/output (I/O) supply: 1.8 V to 3.6 V
    • Performance temperature range: –40°C to +105°C
    • Functional temperature range: –40°C to +125°C
  • Performance
    • Combined ac and dc performance
    • 108 dB signal-to-noise ratio (SNR)/dynamic range at 16 kSPS in high resolution mode
    • −109 dB total harmonic distortion (THD)
    • ±7 ppm integral nonlinearity (INL)
    • ±40/PGAGAIN offset error and ±0.1% gain error
    • ±10 ppm/°C typical temperature coefficient
Additional Details
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The AD7779 is an 8-channel, simultaneous sampling ADC. There are eight full Σ-Δ ADCs on chip. The AD7779 provides an ultralow input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain. The AD7779 accepts VREF from 1 V up to 3.6 V. The analog inputs accept unipolar (0 V to VREF/GAIN) or true bipolar (±VREF/GAIN/2 V) analog input signals with 3.3 V or ±1.65 V analog supply voltages. The analog inputs can be configured to accept true differential, pseudo differential, or singleended signals to match different sensor output configurations.

Each channel contains an ADC modulator and a sinc3, low latency digital filter. An SRC is provided to allow fine resolution control over the AD7779 ODR. This control can be used in applications where the ODR resolution is required to maintain coherency with 0.01 Hz changes in the line frequency. The SRC is programmable through the serial port interface (SPI). The AD7779 implements two different interfaces: a data output interface and SPI control interface. The ADC data output interface is dedicated to transmitting the ADC conversion results from the AD7779 to the processor. The SPI interface is used to write to and read from the AD7779 configuration registers and for the control and reading of data from the SAR ADC. The SPI interface can also be configured to output the Σ-Δ conversion data.

The AD7779 includes a 12-bit SAR ADC. This ADC can be used for AD7779 diagnostics without having to decommission one of the Σ-Δ ADC channels dedicated to system measurement functions. With the use of an external multiplexer, which can be controlled through the three general-purpose inputs/outputs pins (GPIOs), and signal conditioning, the SAR ADC can be used to validate the Σ-Δ ADC measurements in applications where functional safety is required. In addition, the AD7779 SAR ADC includes an internal multiplexer to sense internal nodes.

The AD7779 contains a 2.5 V reference and reference buffer. The reference has a typical temperature coefficient of 10 ppm/°C. The AD7779 offers two modes of operation: high resolution mode and low power mode. High resolution mode provides a higher dynamic range while consuming 10.75 mW per channel; low power mode consumes just 3.37 mW per channel at a reduced dynamic range specification.

The specified operating temperature range is −40°C to +105°C, although the device is operational up to +125°C.

APPLICATIONS

  • Circuit breakers
  • General-purpose data acquisition
  • Electroencephalography (EEG)
  • Industrial process control
Part Models 2
1ku List Price Starting From $7.90

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7779ACPZ
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AD7779ACPZ-RL
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Product Lifecycle

PCN

May 11, 2020

- 20_0186

AD7779 AND AD7770 INL Max specification removal

AD7779ACPZ

PRODUCTION

AD7779ACPZ-RL

PRODUCTION

Nov 29, 2017

- 17_0190

AD7770/1/9 Metal Mask Edit

AD7779ACPZ

PRODUCTION

AD7779ACPZ-RL

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

May 11, 2020

- 20_0186

arrow down

AD7779 AND AD7770 INL Max specification removal

AD7779ACPZ

PRODUCTION

AD7779ACPZ-RL

PRODUCTION

Nov 29, 2017

- 17_0190

arrow down

AD7770/1/9 Metal Mask Edit

AD7779ACPZ

PRODUCTION

AD7779ACPZ-RL

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 1

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EVAL-AD7770-AD7771-AD7779

AD7770 / AD7771 / AD7779 Evaluation Board

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EVAL-AD7770-AD7771-AD7779

AD7770 / AD7771 / AD7779 Evaluation Board

AD7770 / AD7771 / AD7779 Evaluation Board

Features and Benefits

  • Full featured evaluation board for the AD7770, AD7771, and AD7779
  • PC control in conjunction with the Analog Devices, Inc., SDP, EVAL-SDP-CH1Z
  • PC software control and data analysis
  • Time and frequency domain
  • Standalone hardware capability

Product Detail

The EVAL-AD7770FMCZ/EVAL-AD7771FMCZ/EVAL-AD7779FMCZ evaluation kit features the AD7770, AD7771, and AD7779 24-bit, analog-to-digital converters (ADCs). The board interfaces with the system demonstration platform SDP-H1 controller board (EVAL-SDP-CH1Z). The SDP-H1 controller board supplies power to the EVAL-AD7770FMCZ/EVAL-AD7771FMCZ/EVAL-AD7779FMCZ evaluation board and also connects to a PC running a Windows® operating system via a USB cable. The AD777x evaluation software fully configures the AD7770, AD7771, and AD7779 device register functionality and provides dc and ac time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.


The EVAL-AD7770FMCZ/EVAL-AD7771FMCZ/EVAL-AD7779FMCZ evaluation board allows the user to evaluate the features of the ADC. The user PC software executable controls the AD7770, AD7771, and AD7779 over the USB cable through the SDP-H1 controller board.


Full specifications for the AD7770, AD7771, or AD7779 are available in the AD7770, AD7771, or AD7779 data sheets and should be consulted in conjunction with user guide UG-884 when working with the evaluation board.

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