AD7173-8 Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC

The AD7173-8 is a fast settling, highly accurate, low power, 8-/ 16-channel, multiplexed ADC for low bandwidth input signals with integrated input buffers.

Integrated precision, 2.5 V, low drift (3.5 ppm/°C), band gap reference and integrated oscillator.

Eight flexible setups with configurability for output data rate, digital filter mode, offset/gain error correction, reference selection, buffer enables and more.

Sinc5 + sinc1 filter maximizes channel scan rate, and sinc3 filter maximizes resolution and enhanced 50 Hz/60 Hz rejection, with four selectable options to maximize rejection.

Integrated diagnostic features, including CRC, register checksum, temperature sensor, crosspoint multiplexer, burnout currents, and GPIOs/GPOs.

APPLICATIONS

Process control: PLC/DCS modules Voltage, current, temperature, and pressure measurement Flow meters
Medical and scientific multichannel instrumentation
Seismic instrumentation
Chemical analysis instrumentation: chromatography

Features and Benefits

Low power, 8-/16-channel, highly integrated multiplexed analog-to-digital converter (ADC)

Integration

Precision analog input buffers and reference input buffers
2.5 V precision reference (3.5 ppm/°C)
Cross point multiplexer (enable system diagnostic)
8 full differential or 16 single-ended channels
Clock oscillator
GPIO and GPO pins with automatic external mux control

Precision analog input buffers and reference input buffers

2.5 V precision reference (3.5 ppm/°C)

Cross point multiplexer (enable system diagnostic)

8 full differential or 16 single-ended channels

Clock oscillator

GPIO and GPO pins with automatic external mux control

Fast and flexible output rate: 1.25 SPS to 31.25 kSPS

Channel scan data rate: 6.21 kSPS/channel (161 μs settling)

Performance specifications

17.5 noise free bits at 31.25 kSPS
24 noise free bits at 1.25 SPS
INL: ±3 ppm/FSR

17.5 noise free bits at 31.25 kSPS

24 noise free bits at 1.25 SPS

INL: ±3 ppm/FSR

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

Operates with either 3.3 V or5 V supply

Single supply
3.3 V or 5 V AVDD1, 2 V to 5 V AVDD2, and 2 V to 5 V IOVDD
Optional split supply
AVDD1 and AVSS ± 2.5 V or AVDD1 and AVSS ± 1.65 V

Single supply

3.3 V or 5 V AVDD1, 2 V to 5 V AVDD2, and 2 V to 5 V IOVDD

Optional split supply

AVDD1 and AVSS ± 2.5 V or AVDD1 and AVSS ± 1.65 V

Current: 1.4 mA

3-/4-wire serial digital interface (Schmitt trigger on SCLK)

CRC error checking
SPI, QSPI, MICROWIRE, and DSP compatible

CRC error checking

SPI, QSPI, MICROWIRE, and DSP compatible

Package: 40-lead 6 mm × 6 mm LFCSP

Temperature range: −40°C to +105°C

Analog to Digital Converters

A/D Converters

Instrumentation and Measurement

Battery Testing and Formation

IBIS Models

AD7173-8 IBIS Model .IBS

Design Tools

AD7173-8 Filter Model .XLSX

Reference Designs

Software & Systems Requirements

AD717x Eval+ Software .ZIP

Data Sheets

Document	note
AD7173-8: Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC Data Sheet (Rev. A)	PDF 1082 kB

User Guides

Document	note
UG-631: Evaluating the AD7173-8 24-Bit, 31.25 kSPS, Sigma-Delta ADC with 161 μs Settling and Integrated Analog Input Buffers	PDF 803 kB

Technical Books

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7173-8BCPZ Production	40 ld LFCSP (6x6mm w/3.9mm pad)	OTH 490	-40 to 105C	8.51	7.95	Y
AD7173-8BCPZ-RL Production	40 ld LFCSP (6x6mm w/3.9mm pad)	REEL 2500	-40 to 105C	0	7.95	Y