Analog Devices Inc. AD7173-8BCPZ-RL

Overview

AD7173-8BCPZ-RL from Analog Devices is a low-power, 24-bit sigma-delta ADC with 8 fully differential or 16 single-ended input channels, integrated 2.5 V reference (3.5 ppm/°C), crosspoint multiplexer, and on-chip oscillator. It delivers 17.5 noise-free bits at 31.25 kSPS and ±3 ppm FSR INL, targeting high-accuracy industrial process monitoring and multichannel sensor acquisition systems.

For engineers reviewing the AD7173-8BCPZ-RL datasheet, AD7173-8BCPZ-RL pinout, AD7173-8BCPZ-RL application, or AD7173-8BCPZ-RL equivalent, key selection considerations include channel scan rate (6.21 kSPS/channel), sinc5+sinc1 vs. sinc3 filter trade-offs, internal buffer enablement impact on input current (±2 nA), and dual-supply flexibility (AVDD1 = 3.3 V or 5 V, IOVDD = 2–5.5 V).

Technical Context

The AD7173-8BCPZ-RL implements a programmable sigma-delta modulator with selectable digital filters: sinc5+sinc1 for maximum channel scan throughput (161 µs settling) and sinc3 for enhanced 50 Hz/60 Hz rejection (120 dB) and resolution (24 noise-free bits at 1.25 SPS). Its crosspoint multiplexer enables system-level diagnostics by routing any analog input to any ADC channel path.

It integrates dual LDOs (1.8 V for analog/digital domains), precision reference buffers, burnout currents (±10 µA), GPIO/GPO pins with automatic external mux control, and CRC-protected SPI/QSPI/MICROWIRE/DSP-compatible serial interface with Schmitt-triggered SCLK - all operating across −40°C to +105°C.

Key Specifications

Pinout & Package

AD7173-8BCPZ-RL uses a 40-lead, 6 mm × 6 mm LFCSP package with exposed thermal pad soldered to AVSS. Pin functions are validated per Analog Devices Rev. B datasheet (Page 10–11), including dedicated analog inputs (AIN0–AIN16), reference terminals (REF+, REF−, REFOUT), clock interfaces (XTAL1, XTAL2/CLKIO), and configurable I/O (GPIO0, GPIO1, GPO2, GPO3, ERROR, SYNC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7173-8BCPZ-RL, AD7172-2BRUZ reduces channel count and diagnostic capability for compact dual-sensor designs, while ADS127L01IPBSR trades integration for raw speed and demands external support circuitry - making AD7173-8BCPZ-RL optimal for scalable, self-diagnosing multichannel systems.

Availability

AD7173-8BCPZ-RL is available at Aetrix Electronics and suitable for process control PLC modules, medical multichannel instrumentation, and seismic data acquisition systems requiring stable component supply, extended temperature operation (−40°C to +105°C), and long-term parametric consistency.

Supply support for AD7173-8BCPZ-RL 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD7173-8BCPZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, engineered for industrial process automation, scientific instrumentation, and energy monitoring where multichannel accuracy, low power, and integrated diagnostics are critical.

FAQ

What is the maximum channel scan rate supported by the AD7173-8BCPZ-RL?

The AD7173-8BCPZ-RL achieves a channel scan data rate of 6.21 kSPS per channel with 161 µs settling time when using the sinc5+sinc1 filter configuration. This allows full acquisition across all 16 single-ended or 8 differential channels within approximately 2.56 ms, enabling real-time monitoring in fast-loop industrial control applications. The AD7173-8BCPZ-RL's crosspoint multiplexer ensures consistent signal path integrity during rapid channel switching.

Does the AD7173-8BCPZ-RL require an external crystal for operation?

No, the AD7173-8BCPZ-RL includes an integrated 2 MHz oscillator with ±2.5% accuracy, sufficient for most industrial applications. External crystal (14–16.384 MHz) or clock input (2–2.048 MHz) is optional and used only when tighter timing accuracy or synchronization across multiple devices is required. The AD7173-8BCPZ-RL automatically configures its internal clock circuitry based on the CLOCKSEL bit setting in the ADCMODE register.

How does the AD7173-8BCPZ-RL handle 50 Hz and 60 Hz interference rejection?

The AD7173-8BCPZ-RL provides 120 dB rejection of 50 Hz and 60 Hz line noise at 20 SPS using its enhanced sinc3 filter with built-in notch characteristics. This rejection is achieved without external components and remains effective across temperature variations due to the 3.5 ppm/°C internal reference drift specification. The AD7173-8BCPZ-RL also supports user-selectable filter modes (sinc5+sinc1, sinc3, or enhanced 50/60 Hz rejection variants) via the Filter Configuration Registers.

Can the AD7173-8BCPZ-RL operate with split analog supplies?

Yes, the AD7173-8BCPZ-RL supports split analog supplies: AVDD1 and AVSS can be configured as ±2.5 V or ±1.65 V, enabling bipolar input signal acquisition. In this mode, the analog input voltage range becomes ±VREF (±2.5 V), and the device maintains full 24-bit resolution and ±3 ppm/FSR INL performance. The AD7173-8BCPZ-RL's dual LDO architecture (REGCAPA and REGCAPD) independently regulates analog and digital domains under split-supply conditions.

What diagnostic features are integrated into the AD7173-8BCPZ-RL?

The AD7173-8BCPZ-RL integrates CRC error checking on serial communications, register checksum validation, an on-chip temperature sensor (±2°C accuracy post-calibration), burnout current sources (±10 µA), crosspoint multiplexer-based signal path diagnostics, and GPIO/GPO pins for automated external multiplexer control. These features allow system-level health monitoring and calibration verification without additional external circuitry - a capability confirmed in the AD7173-8BCPZ-RL Functional Block Diagram and Integrated Functions section of the datasheet.