AD7190 Sigma-Delta Converter

4.8kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA - Available at Digi-Key

Analog Devices introduces a sigma-delta ADC (analog-to-digital converter) that features the industry's best combination of data rate and noise-free resolution. While the resolution of competing devices degrades quickly at speeds beyond 1kHz, ADI's 24-bit AD7190 sigma-delta ADC achieves greater than true 16-bit noise-free resolution up to 2.4kHz across all input voltages from 40mV to 5V. This level of performance allows designers to measure much smaller signals faster and with greater accuracy which can significantly improve system performance for precision instruments.
AD7190 Datasheet

Analog Devices, Inc. AD7190 Sigma-Delta Converter

Overview
Features & Applications
Diagram
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Overview

On-chip PGA Delivers Ultra-low Noise Performance and Industry-leading Offset Drift
The AD7190 sigma-delta ADC includes an advanced, on-chip PGA (programmable gain amplifier) with ultra-low noise and drift from dc to 4.8kHz. The innovative design of the integrated PGA allows the AD7190 sigma-delta ADC to realize an ultra-low noise of only 7nV rms (root mean squared) at 4.7Hz data rate with a gain of 128, and an industry-leading offset drift of only 5nV/ degrees C. In addition to delivering two bits better resolution than competing sigma-delta ADCs designed to convert small input signals at kHz data rates, the highly integrated AD7190 reduces signal chain cost by up to 25 percent through on-chip features that include an oscillator; temperature sensor; bridge power-down switch; reference detect monitor; and a choice of single-ended, pseudo-differential or fully differential input channels. Also included on-chip are simultaneous 50-/60-Hz rejection; offset and gain calibration; open sensor detection; a choice of chopped or non-chopped signal; and four general-purpose output pins. A zero-latency mode is selectable in order to reduce software overheads if a valid conversion per data output is desired.

Features

RMS noise: 8.5nV @ 4.7Hz (gain = 128)
16 noise free bits @ 2.4kHz (gain = 128)
Up to 22.5 noise free bits (gain = 1)
Offset drift: 5nV/°C
Gain drift: 1ppm/°C
Specified drift over time
2 differential/4 pseudo differential input channels
Automatic channel sequencer
Programmable gain (1 to 128)
Output data rate: 4.7Hz to 4.8kHz
Internal or external clock
Simultaneous 50Hz/60Hz rejection

Applications

Weigh scales
Strain gauge transducers
Pressure measurement
Temperature measurement
Chromatography
PLC/DCS analog input modules
Data acquisition
Medical and scientific instrumentation

Functional Block Diagram

Analog Devices, Inc. AD7190 Block Diagram

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Digi-Key Part Number	ADI Part Number	Sampling Rate (Per Second)	Power Dissipation (Max)	Number of Inputs and Type	Package / Case
AD7190BRUZ-ND	AD7190BRUZ	4.8k	36.8mW	2 Differential, Bipolar; 4 Pseudo-Differential, Bipolar	24-TSSOP