AD4190-4

RECOMMENDED FOR NEW DESIGNS

24-Bit, 62.5kSPS, Multichannel, Low-Noise Precision Sigma-Delta ADC

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Input referred noise: 10nV at 3.8SPS, Gain = 128
  • Crosspoint multiplexed analog inputs
  • 4 Differential/8 Pseudodifferential inputs
  • Ultra-low noise integrated PGA, gains of 0.5 to 128
  • Output data rate: 3.8SPS to 62.5kSPS
  • Flexible digital filters
    • Low latency sinc filters
    • Simultaneous 50Hz/60Hz rejection
  • Band-gap reference with 5ppm/°C drift typical
  • Internal oscillator
  • Analog power supply: 4.75V to 5.25V or ±2.5V
  • Digital power supply: 1.7V to 5.25V
  • Matched programmable excitation current sources
  • Low-side power switches
  • Four general-purpose inputs/outputs
  • On-chip bias voltage generator
  • Internal temperature sensor
  • Internal and system calibration
  • Sensor burnout detection
  • Diagnostic functions
  • Per channel configuration
  • Flexible automatic channel sequencer
  • 3- or 4-wire serial interface (Schmitt trigger on SCLK)
    • SPI, QSPI, MICROWIRE, and DSP compatible
  • TDM compatible interface for data streaming
  • Performance temperature range: −40°C to +105°C
  • Functional temperature range: −40°C to +125°C
  • Available in 32-lead 4mm x 6mm LFCSP package

The AD4190-4 is a low noise, completely integrated analog front end for high precision measurement applications. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC) and can be configured to have four differential or eight single-ended or pseudodifferential inputs. The on-chip low-noise gain stage ensures that signals of small amplitude can be interfaced directly to the ADC.

The AD4190-4 offers the highest degree of signal chain integration. The device contains an internal reference and accepts two external differential references, which can be internally buffered. Other key integrated features include:

  • Programmable gain amplifier (PGA). Due to the programmable gain (0.5 to 128), the PGA allows direct interfacing to transducers with low output amplitudes such as resistive bridges, thermocouples, and resistance temperature detectors (RTDs).
  • The PGA has a wide common-mode input range, which gives designers a greater margin for widely varying input common modes.
  • Low drift, well matched precision current sources. Use the excitation current sources to excite 2-, 3-, and 4-wire RTDs or bridge type sensors. Excitation current output options include 10μA, 50μA, 100μA, 250μA, 500μA, 1mA, and 1.5mA. The currents can also be added if higher currents are required.
  • Use the low-side power switch (PDSW) to power down bridge sensors between conversions.
  • Voltage bias for thermocouples (the VBIAS source sets the common-mode voltage of a channel to (AVDD + AVSS)/2.
  • The smart sequencer allows the conversion of each enabled preconfigured channel in a predetermined order, which allows a mix of transducer, system checks, and diagnostic measurements to be interleaved. The sequencer eliminates the need for repetitive serial interface communication with the device to change configuration. Configure the 16-channels in the sequence. Each of these channels selects from eight user-defined ADC setups that allow selection of gain, filter type, output data rate, buffering, and reference source.

Please see data sheet for the full description

APPLICATIONS

  • Industrial process control: PLC/DCS modules
  • Temperature measurement
  • Pressure measurement
  • Medical and scientific instrumentation
  • Chromatography
  • Environmental monitoring
  • Electrical test and measurement
  • Instrumentation
  • Weigh scale
AD4190-4
24-Bit, 62.5kSPS, Multichannel, Low-Noise Precision Sigma-Delta ADC
AD4190-4 Functional Block Diagram AD4190-4 Pin Configuration AD4190-4 Chip Illustration
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Documentation

Data Sheet 1

User Guide 1

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Software Resources

Device Drivers 2

Evaluation Kits

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EVAL-AD4190-4

Evaluating the AD4190-4, 24-Bit, 62.5kSPS, Multichannel, Low-Noise Precision Sigma-Delta ADC with PGA

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Features and Benefits

Product Details

The EVAL-AD4190-4ARDZ evaluation board features the AD4190-4, which is a 24-bit, multichannel, low-noise precision sigma-delta analog-to-digital converter (ADC).

The EVAL-AD4190-4ARDZ evaluation board connects to the USB port of the PC by connecting to the SDP-K1 controller board. A 5V USB supply by the PC is regulated to supply the AD4190-4 and support all necessary components.

The AD4190-4 ACE plug-in fully configures the AD4190-4 device register functionality and provides DC time domain analysis in the form of waveform graphs and associated noise analysis for ADC performance evaluation. The AC analysis is also provided by the software such as a fast fourier transform (FFT), which displays the first five harmonics of the following parameters: SNR, SFDR, S/N+D, and THD.

The EVAL-AD4190-4ARDZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the AD4190-4 over the USB through the SDP-K1 system demonstration platform (SDP) board.

Full specifications on the AD4190-4 are available in the AD4190-4 data sheet available from Analog Devices, Inc., and must be consulted with this user guide when using the EVAL-AD4190-4ARDZ evaluation board.
EVAL-AD4190-4
Evaluating the AD4190-4, 24-Bit, 62.5kSPS, Multichannel, Low-Noise Precision Sigma-Delta ADC with PGA
EVAL-AD4195-4 Board Photo Angle View EVAL-AD4195-4 Board Photo Top View EVAL-AD4195-4 Board Photo Bottom View

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