AD7175-2 24-Bit, 250 kSPS, Sigma-Delta ADC with 20 µs Settling and True Rail-to-Rail Buffers

The AD7175-2 is a 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 50 kSPS (20 µs) for fully settled data. The output data rates range from 5 SPS to 250 kSPS.

The AD7175-2 integrates key analog and digital signal conditioning 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/60 Hz rejection at 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, or ±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. The AD7175-2 is in a 24-lead TSSOP package.

Applications

Features and Benefits

Fast and flexible output rate: 5 SPS to 250 kSPS

Channel scan data rate of 50 kSPS/channel (20 µs settling)

Performance specifications

17.2 noise free bits at 250 kSPS
20 noise free bits at 2.5 kSPS
24 noise free bits at 20 SPS
INL: ±1 ppm of FSR

17.2 noise free bits at 250 kSPS

20 noise free bits at 2.5 kSPS

24 noise free bits at 20 SPS

INL: ±1 ppm of FSR

85 dB rejection of 50 Hz and 60 Hz with 50 ms settling

User configurable input channels

2 fully differential channels or 4 single-ended channels
Crosspoint multiplexer

2 fully differential channels or 4 single-ended channels

Crosspoint multiplexer

On-chip 2.5 V 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 with AVDD1/AVSS at ±2.5 V

Split supply with AVDD1/AVSS at ±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

Serial port interface (SPI), QSPI, MICROWIRE, and DSP compatible

Data Sheets

Document	note
AD7175-2: 24-Bit, 250 kSPS, Sigma-Delta ADC with 20 μs Settling and True Rail-to-Rail Buffers Data Sheet (Rev. B)	PDF 1.24 M

User Guides

Document	note
UG-741: Evaluating the AD7175-2 24-Bit, 250 kSPS, Sigma-Delta ADC with 20 μs Settling and Integrated Analog Input Buffer	PDF 826.67 K

Technical Books

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7175-2BRUZ Production	24 ld TSSOP	OTH 62	-40 to 105C	12.68	11.85	Y
AD7175-2BRUZ-RL Production	24 ld TSSOP	REEL 2500	-40 to 105C	0	11.85	Y
AD7175-2BRUZ-RL7 Production	24 ld TSSOP	REEL 1000	-40 to 105C	0	11.85	Y