ADI AD7175-2BRUZ

The AD7175-2 is a low noise, fast settling, multiplexed, 2/4-channel (fully differential/pseudo-differential) Σ-Δ ADC for low-bandwidth inputs. For fully settled data, the maximum channel scan rate is 50 kSPS (20 µs). The output data rate ranges from 5 SPS to 250 kSPS. The AD7175-2 integrates key analog and digital signal conditioning blocks that allow users to configure each analog input channel independently. Each feature can be selected on a per-channel basis. True rail-to-rail buffers integrated at the analog inputs and external reference inputs provide easy-to-drive high-impedance inputs. A precision 2.5 V low-drift (2 ppm/°C) bandgap internal voltage reference with output reference buffer adds embedded functionality while reducing external component count. The digital filter provides simultaneous 50 Hz/60 Hz rejection at an output data rate of 27.27 SPS. Users can switch between different filter options as needed for each channel in the application. The ADC automatically sequences through each selected channel. Additional digital processing features include offset and gain calibration registers configurable on a per-channel basis. The device operates from a 5 V AVDD1 or ±2.5 V AVDD1/AVSS, 2 V to 5 V AVDD2, and IOVDD supply. The AD7175-2 is rated for an operating temperature range of −40°C to +105°C and is available in a 24-lead TSSOP package.

• Fast and flexible output rates: 5 SPS to 250 kSPS channel scan data rate: 50 kSPS/channel [20 µs settling time]
• Performance specifications: 17.2-bit noise-free resolution (250 kSPS); 20-bit noise-free resolution (2.5 kSPS); 24-bit noise-free resolution (20 SPS); INL: ±τ ppm of FSR
• 50 Hz and 60 Hz rejection: 85 dB, settling time 50 ms
• User-configurable input channels: 2 differential channels or 4 single-ended channels crosspoint multiplexer
• 2.5 V on-chip voltage reference (±2 ppm/°C drift)
• True rail-to-rail analog and reference input buffers
• Internal or external clock
• Power supply: AVDD1 = 5 V, AVDD2 = IOVDD = 2 V to 5 V split supply, AVDD1/AVSS = ±2.5 V
• ADC current: 8.4 mA
• Temperature range: -40°C to +105°C
• 3- or 4-wire serial digital interface (Schmitt trigger on SCLK) compatible with SPI, QSPI, MICROWIRE, and DSP

• Process Control: PLC/DCS module temperature and pressure measurement
• Medical and scientific multi-channel instrumentation
• Chromatography instruments