AD7172-2 Series

Low Power, with 4- or 8-channel, 24-bit, 31.25 kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers

Catalog

Low Power, with 4- or 8-channel, 24-bit, 31.25 kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers

Part	Mounting Type	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Package / Case	Supplier Device Package	Number of Bits	Number of A/D Converters	Data Interface	Architecture	Voltage - Supply, Analog [Max]	Voltage - Supply, Analog [Min]	Number of Inputs	Sampling Rate (Per Second)	Input Type	Reference Type
Analog Devices AD7172-2BRUZ	Surface Mount	5.5 V	2 V	MUX-ADC	-40 °C	105 ░C	24-TSSOP	0.173 in 4.4 mm	24-TSSOP	24	1	DSP SPI	Sigma-Delta	5.5 V	2 V	2 4	31.25 Per Second	Differential Single Ended	External Internal
Analog Devices AD7172-2BRUZ-RL	Surface Mount	5.5 V	2 V	MUX-ADC	-40 °C	105 ░C	24-TSSOP	0.173 in 4.4 mm	24-TSSOP	24	1	DSP SPI	Sigma-Delta	5.5 V	2 V	2 4	31.25 Per Second	Differential Single Ended	External Internal
Analog Devices AD7172-4BCPZ-RL7	Surface Mount	5.5 V	2 V	MUX-ADC	-40 °C	105 ░C	32-WFQFN Exposed Pad CSP		32-LFCSP (5x5)	24	1	DSP SPI	Sigma-Delta	5.5 V	2 V	4 8	31.25 Per Second	Differential Single Ended	External Internal
Analog Devices AD7172-2BRUZ-RL7	Surface Mount	5.5 V	2 V	MUX-ADC	-40 °C	105 ░C	24-TSSOP	0.173 in 4.4 mm	24-TSSOP	24	1	DSP SPI	Sigma-Delta	5.5 V	2 V	2 4	31.25 Per Second	Differential Single Ended	External Internal

Catalog

Low Power, with 4- or 8-channel, 24-bit, 31.25 kSPS, Sigma-Delta ADC with True Rail-to-Rail Buffers

Key Features

• Fast and flexible output rate: 1.25 SPS to 31.25 kSPS

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

• Performance specifications

• 17.2 noise free bits at 31.25 kSPS

• 24 noise free bits at 5 SPS

• INL: ±2 ppm of FSR

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

• User configurable input channels

• 4 fully differential channels or 8 single-ended channels

• Crosspoint multiplexer

• True rail-to-rail analog and reference input buffers

• Internal or external clock

• Power supply

• AVDD1 = 3.0 V to 5.5 V, AVDD2 = IOVDD = 2 V to 5.5 V

• Split supply with AVDD1 and AVSS at ±2.5 V or ±1.65 V

• ADC current: 1.5 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 DSPcompatible

Description

TThe AD7172-2 is an intelligent, low noise, low power, multiplexed, Σ-Δ analog-to-digital converter (ADC) with 2- or 4-channel (fully differential/single-ended) inputs for low bandwidth signals. The AD7172-2 has a maximum channel scan rate of 6.21 kSPS (161 µs) for fully settled data. The output data rates range from 1.25 SPS to 31.25 kSPS.The AD7172-2 integrates key analog and digital signal conditioning blocks to allow users to configure an individual setup for each analog input channel in use via the SPI. 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 an output reference buffer) adds embedded functionality to reduce the 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, with further digital processing functions such as offset and gain calibration registers, which are also configurable on a per channel basis. General-purpose inputs/outputs (GPIOs) control external multiplexers synchronous to the ADC conversion timing.The specified operating temperature range is −40°C to +105°C. The AD7172-2 is in a 24-lead TSSOP package.ApplicationsProcess control: PLC/DCS modules- Temperature and pressure measurementMedical and scientific multichannel instrumentationChromatography