Analog Devices Inc. AD7172-2BRUZ-RL

Description
The AD7172-2 is a low-power, 24-bit, 31.25 KSPS sigma-delta ADC with true rail-to-rail buffers. It features a fast and flexible output rate ranging from 1.25 SPS to 31.25 KSPS, with a channel scan data rate of 6.21 kSPS/channel (161 μs settling). The ADC offers high performance specifications, including 17.2 noise-free bits at 31.25 KSPS and 24 noise-free bits at 5 SPS. It has an INL of ±2 ppm of FSR and 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling.
The AD7172-2 provides user-configurable input channels, allowing for 2 fully differential channels or 4 single-ended channels. It includes a crosspoint multiplexer, an on-chip 2.5 V reference (±2 ppm/°C drift), and true rail-to-rail analog and reference input buffers. The ADC can operate with an internal or external clock and supports a power supply range of AVDD1 = 3.0 V to 5.5 V, AVDD2 = 10 V, and VDD = 2 V to 5.5 V. It has a split supply with AVDD1 and AVSS at ±2.5 V or ±1.65 V and consumes only 1.5 mA of current. The operating temperature range is -40°C to 105°C.

Features
Fast and flexible output rate: 1.25 SPS to 31.25 KSPS
Channel scan data rate of 6.21 kSPS/channel (161 μs settling)
Performance specifications:
17.2 noise-free bits at 31.25 KSPS
24 noise-free bits at 5 SPS
INL: ±2 ppm of FSR
85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
User-configurable input channels:
2 fully differential channels
4 single-ended channels
Crosspoint multiplexer
On-chip 2.5 V reference (±2 ppm/°C drift)
True rail-to-rail analog and reference input buffers
Internal or external clock
Power supply:
AVDD1 = 3.0 V to 5.5 V
AVDD2 = 10 V
VDD = 2 V to 5.5 V
Split supply with AVDD1 and AVSS at ±2.5 V or ±1.65 V
ADC current: 1.5 mA
Temperature range: -40°C to 105°C
3- or 4-wire serial digital interface (Schmitt trigger on SCLK)
Serial port interface (SPI), QSPI-, MICROWIRE-, and DSP-compatible

Applications
Process control: PLC/DCS modules
Temperature and pressure measurement
Medical and scientific multichannel instrumentation
Chromatography