AD7175-8 24-Bit, 8-/16-Channel, 250 kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers

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

The AD7175-8 is a low noise, fast settling, multiplexed, 8-/16- channel (fully/pseudo differential) Σ-Δ analog-to-digital converter (ADC) for low bandwidth inputs. It has a maximum channel scan rate of 50 kSPS (20 ìs) for fully settled data. The output data rates range from 5 SPS to 250 kSPS.

The AD7175-8 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.

The digital filter allows simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application. The ADC automatically switches 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 . AVSS supply, or with ±2.5 V AVDD1/AVSS, and 2.5 V to 5 V AVDD2 and IOVDD supplies. The specified operating temperature range is .40°C to +105°C. The AD7175-8 is available in a 40-lead LFCSP package.

Features and Benefits

Fast and flexible output rate: 5 SPS to 250 kSPS
Channel scan data rate of 50 kSPS/channel (20 ìs settling)
Performance specifications
17.2 noise free bits at 250 kSPS
20.2 noise free bits at 2.5 kSPS
24 noise free bits at 20 SPS
INL: ±1 ppm of FSR
85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling

User configurable input channels
8 fully differential channels or 16 single-ended channels
Crosspoint multiplexer
On-chip 2.5 V reference (±2 ppm/°C drift)
True rail-to-rail analog and reference input buffers
See data sheet for additional features

Analog to Digital Converters

A/D Converters

Aerospace and Defense

Solutions

Data Sheets

Document	note
AD7175-8: 24-Bit, 8-/16-Channel, 250 kSPS, Sigma- Delta ADC with True Rail-to-Rail Buffers Preliminary Data Sheet (Rev. 0)	PDF 1.03 M

User Guides

Document	note
UG-901: Evaluating the AD7175-8 24-Bit, 250 kSPS, Sigma-Delta ADC with 20 µs Settling and Integrated Analog Input Buffers	PDF 688.61 K

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7175-8BCPZ Production	40 ld LFCSP (6x6mm w/3.9mm pad)	OTH 490	-40 to 105C	13.7	12.8	Y
AD7175-8BCPZ-RL Production	40 ld LFCSP (6x6mm w/3.9mm pad)	REEL 2500	-40 to 105C	0	12.8	Y
AD7175-8BCPZ-RL7 Production	40 ld LFCSP (6x6mm w/3.9mm pad)	REEL 750	-40 to 105C	0	12.8	Y