ADI AD7177-2BRUZ

The AD7177-2 is a 32-bit, low noise, fast settling, multiplexed, 2/4-channel (fully differential/pseudo-differential) Σ-Δ ADC designed for low bandwidth inputs. The device achieves a maximum channel scan rate of 10 kSPS (100 μs) for fully settled data. The output data rate ranges from 5 SPS to 10 kSPS. The AD7177-2 integrates key analog and digital signal conditioning blocks, allowing users to configure each analog input channel independently. Individual channel functions can be selected on a per-channel basis. Integrated true rail-to-rail input buffers on 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 reference with an output reference buffer enhances embedded functionality while reducing external component count. The digital filter provides simultaneous 50 Hz and 60 Hz rejection at an output data rate of 27.27 SPS. Users can switch between different filter options to meet the requirements of 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 supply, a 2 V to 5 V AVDD2 supply, and an IOVDD supply. The AD7177-2 is rated for an operating temperature range of −40°C to +105°C and is available in a 24-lead TSSOP package.

• 32-bit data output
• Fast and flexible output data rate: 5 SPS to 10 kSPS
• Channel scan data rate: 10 kSPS/channel (100 μs settling time)
• 19.1-bit noise-free resolution (10 kSPS)
• 20.2-bit noise-free resolution (2.5 kSPS)
• 24.6-bit noise-free resolution (5 SPS)
• Integral nonlinearity (INL): ±1 ppm of FSR
• 50 Hz and 60 Hz rejection: 85 dB, settling time 50 ms
• User-configurable input channels: 2 fully differential or 4 single-ended channel crosspoint multiplexer
• 2.5 V on-chip reference (±2 ppm/°C drift)
• True rail-to-rail analog and reference input buffers
• Internal or external clock
• Power supply: AVDD1 - AVSS = 5 V, AVDD2 = |OVDD = 2.5 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), SPI, QSPI, MICROWIRE, and DSP compatible

• Process Control: PLC/DCS modules
• Temperature and pressure measurement
• Medical and scientific multi-channel instrumentation
• Chromatographs