AD7175 test board

AD7175: Fast and flexible output rates: 5 SPS to 250 kSPS

• Channel scan 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)
  • 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 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
  • Separate power supply, AVDD1/AVSS is ±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)
  • Serial Port Interface (SPI), QSPI, MICROWIRE and DSP compatible

In addition to the ADC, the board also contains a differential amplifier circuit designed based on the AD8220 instrumentation amplifier to evaluate the differential input performance of the AD7175. The power supply uses TPS63070, ADP7115, ADP7182 and ADM660 to provide ±5V and 3.3V power rails for the op amp and ADC. Compatible with 2-16V input.