ADS1257IRGWT Part Information

Details for ADS1257IRGWT by Texas Instruments

Semiconductors - ICs>Data & Signal Conversion>Analog-to-Digital Converters - ADC

Part Description

The ADS1257 is a low-noise, 30-kSPS, 24-bit, deltasigma (ΔΣ) analog-to-digital converter (ADC) with an integrated multiplexer (mux), input buffer, and programmable gain amplifier (PGA) in a small 20-pin, 5-mm × 5-mm VQFN package. The combination of integration, high conversion rate, and 24-bit resolution together in a small package makes the device ideally suited for space-constrained applications. The input multiplexer accepts either two differential or three single-ended input measurements. The sensorbreak detection circuit verifies the input connection continuity to the ADC. The selectable input buffer greatly increases the input impedance, and in many cases, eliminates the need for external buffers. The buffer input voltage range includes AGND. The lownoise PGA provides gains from 1 to 64 to accommodate a wide range of inputs signals. The programmable digital filter optimizes ADC resolution (up to 23 bits noise-free) and conversion rates (up to 30 kSPS). The digital filter provides single-cycle settled conversions, and rejection of 50-Hz and 60-Hz interference signals. The SPI-compatible serial interface operates with as little as three wires, simplifying connections to external controllers. Integrated calibration features support both self and system correction of offset and gain errors for all PGA gain settings. Two bidirectional digital I/Os pins control external circuits.

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Part Features

  • 2 General-Purpose Input/Outputs
  • 4 Analog Inputs u2013 2 Differential or 3 Single-Ended Measurements
  • 5-V Tolerant SPIu2122-Compatible Serial Interface
  • 50-Hz and 60-Hz Rejection
  • Differential-Input PGA
  • Excellent DC Performance u2013 Offset Drift: 4 nV/u00b0C (Gain = 64) u2013 Gain Drift: 0.8 ppm/u00b0C u2013 Nonlinearity: 3 ppm (Gain = 1)
  • High Impedance Input Buffer
  • Integrated Sensor Break Detection
  • Power Supplies: u2013 Analog: 5 V u2013 Digital: 1.8 V to 3.6 V
  • Programmable Data Rates: 2.5 SPS to 30 kSPS
  • Single-Cycle Settled Conversions (u2264 1000 SPS)
  • Small 5-mm u00d7 5-mm VQFN Package
  • Up to 23-Bits Noise-Free Resolution

Part Specifications

Resolution (Bits) 24bit
Sampling Rate 30kSPS
Input Channel Type Differential Single Ended
Data Interface SPI
Supply Voltage Type Single
Supply Voltage Min 4.75V
Supply Voltage Max 5.25V
ADC / DAC Case Style VQFN
No. of Pins 20Pins
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range Quad 24-Bit Sigma-Delta ADCs
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 3 - 168 hours
SVHC No SVHC (27-Jun-2018)
RoHS Compliant

Alternative Part Descriptions

  • 24-Bit, 30kSPS, 4-Ch Industrial ADC With Integrated PGA | Texas Instruments

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