32-Bit, 10 kSPS, Sigma-Delta ADC with 100 µs
Settling and True Rail-to-Rail Buffers
32-bit data output
Fast and flexible output rate: 5 SPS to 10 kSPS
Channel scan data rate of 10 kSPS/channel (100 µs settling)
19.1 noise free bits at 10 kSPS
20.2 noise free bits at 2.5 kSPS
24.6 noise free bits at 5 SPS
INL: ±1 ppm of FSR
85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling
User configurable input channels
2 fully differential channels or 4 single-ended channels
On-chip 2.5 V reference (±2 ppm/°C drift)
True rail-to-rail analog and reference input buffers
The AD7177-2 is a 32-bit low noise, fast settling, multiplexed,
2-/4-channel (fully/pseudo differential) Σ-Δ analog-to-digital
converter (ADC) for low bandwidth inputs. It has a maximum
channel scan rate of 10 kSPS (100 µs) for fully settled data. The
output data rates range from 5 SPS to 10 kSPS.
The AD7177-2 integrates key analog and digital signal condition-
ing blocks to allow users to configure an individual setup for
each analog input channel in use. Each feature can be user selected
on a per channel basis. Integrated true rail-to-rail buffers on the
analog inputs and external reference inputs provide easy to drive
high impedance inputs. The precision 2.5 V low drift (2 ppm/°C)
band gap internal reference (with output reference buffer) adds
embedded functionality to reduce external component count.
Internal or external clock
The digital filter allows simultaneous 50 Hz and 60 Hz rejection
Power supply: AVDD1 − AVSS = 5 V, AVDD2 = IOVDD = 2.5 V
at a 27.27 SPS output data rate. The user can switch between
to 5 V
different filter options according to the demands of each
Split supply with AVDD1/AVSS at ±2.5 V
channel in the application. The ADC automatically switches
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
through each selected channel. Further digital processing
functions include offset and gain calibration registers,
configurable on a per channel basis.
The device operates with a 5 V AVDD1 supply, or with ±2.5 V
AVDD1/AVSS, and 2 V to 5 V AVDD2 and IOVDD supplies.
The specified operating temperature range is −40°C to +105°C.
Process control: PLC/DCS modules
The AD7177-2 is available in a 24-lead TSSOP package.
Temperature and pressure measurement
Medical and scientific multichannel instrumentation
FUNCTIONAL BLOCK DIAGRAM
AVDD1 AVDD2 REGCAPA
REF– REF+ REFOUT
XTAL AND INTERNAL
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