Analog Devices Inc. AD7172-4BCPZ-RL7

Overview

AD7172-4BCPZ-RL7 from Analog Devices is a low-noise, low-power, 24-bit sigma-delta ADC with true rail-to-rail analog and reference input buffers, supporting up to 31.25 kSPS output data rate, ±2 ppm INL accuracy, and 4 fully differential or 8 single-ended input channels - deployed in high-precision multichannel instrumentation for temperature/pressure sensing and chromatography systems.

For engineers reviewing the AD7172-4BCPZ-RL7 datasheet, AD7172-4BCPZ-RL7 pinout, AD7172-4BCPZ-RL7 application, or AD7172-4BCPZ-RL7 equivalent, key selection criteria include noise-free resolution (24 bits at 5 SPS), simultaneous 50/60 Hz rejection, crosspoint multiplexer flexibility, buffered rail-to-rail input range, and SPI/QSPI/MICROWIRE-compatible serial interface with Schmitt-triggered SCLK.

Technical Context

The AD7172-4BCPZ-RL7 integrates a sinc5+sinc1 digital filter for single-cycle settling at ≤161 μs per channel and supports programmable filter modes including enhanced 50 Hz/60 Hz rejection at 27.27 SPS. Its crosspoint multiplexer enables per-channel configuration of input type (differential/single-ended), buffer enable, reference selection, and gain calibration.

It features dual LDOs (1.8 V) for AVDD1/AVDD2 and IOVDD domains, split-supply operation (±2.5 V or ±1.65 V), and GPIO-controlled external multiplexer synchronization. The internal 2 MHz clock offers ±2.5% accuracy, while crystal (16.384 MHz) or external clock (2.048 MHz) options support timing-critical applications.

Key Specifications

Pinout & Package

The AD7172-4BCPZ-RL7 is housed in a 5 mm × 5 mm, 32-lead LFCSP package with exposed thermal pad soldered to AVSS for mechanical stability and heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.

Compared with AD7172-4BCPZ-RL7, AD7177-2BRUZ trades channel scalability for higher resolution and lower noise floor, while ADS1263IPBSR adds integrated analog front-end functions at the cost of reduced configurability in reference and buffer routing.

Availability

AD7172-4BCPZ-RL7 is available at Aetrix Electronics and suitable for process control, medical instrumentation, chromatography, and scientific data acquisition requiring stable component supply across long-lifecycle industrial programs.

Supply support for AD7172-4BCPZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7172-4BCPZ-RL7 belongs to the AD717x family of precision sigma-delta ADCs designed specifically for multichannel, low-power, high-accuracy industrial and scientific measurement systems.

FAQ

What is the maximum channel scan rate supported by the AD7172-4BCPZ-RL7?

The AD7172-4BCPZ-RL7 achieves a maximum channel scan rate of 6.21 kSPS per channel with 161 μs settling time for fully settled data. This is enabled by its sinc5+sinc1 digital filter architecture and crosspoint multiplexer, allowing rapid switching between up to eight single-ended or four differential inputs while maintaining accuracy and noise performance specified in the AD7172-4BCPZ-RL7 datasheet.

Does the AD7172-4BCPZ-RL7 support external reference inputs?

Yes, the AD7172-4BCPZ-RL7 supports both internal and external reference configurations. It provides dedicated REF+ and REF− pins accepting 1 V to AVDD1 differential reference voltage, with true rail-to-rail buffering enabling direct connection to precision external references such as the ADR4525. Reference selection (REF1 or REF2) is controlled per channel via the REF_SELx bits in the SETUPCONx registers of the AD7172-4BCPZ-RL7.

How does the AD7172-4BCPZ-RL7 handle 50 Hz and 60 Hz interference rejection?

The AD7172-4BCPZ-RL7 implements enhanced digital filters that deliver 120 dB rejection of 50 Hz and 60 Hz interference at 20 SPS output data rate (post-filter), and simultaneous 50/60 Hz rejection at 27.27 SPS. This is achieved without external notch filters or additional hardware, making the AD7172-4BCPZ-RL7 ideal for use in electrically noisy industrial environments where mains-frequency interference is prevalent.

What power supply configurations are supported by the AD7172-4BCPZ-RL7?

The AD7172-4BCPZ-RL7 supports multiple supply configurations: AVDD1 = 3.0 V to 5.5 V, AVDD2 = IOVDD = 2 V to 5.5 V, and split supplies (AVDD1/AVSS = ±2.5 V or ±1.65 V). It integrates two 1.8 V LDOs for analog and digital domains, and specifies 1.5 mA total current consumption in full operating mode with buffers enabled - enabling robust operation in both single- and dual-supply industrial systems using the AD7172-4BCPZ-RL7.

Can the AD7172-4BCPZ-RL7 interface with standard SPI controllers?

Yes, the AD7172-4BCPZ-RL7 features a 3- or 4-wire SPI-compatible serial interface with Schmitt-triggered SCLK, supporting QSPI, MICROWIRE, and DSP protocols. It operates with CS, SCLK, DIN, and DOUT/RDY signals, and includes CRC checksum protection and register-level access control. The AD7172-4BCPZ-RL7 requires no special timing constraints beyond standard SPI setup/hold times, ensuring seamless integration with common microcontrollers and FPGAs.