Analog Devices Inc. AD7194BCPZ-REEL

Overview

AD7194BCPZ-REEL from Analog Devices is a 24-bit sigma-delta analog-to-digital converter (ADC) with integrated PGA, supporting up to 8 differential or 16 pseudo-differential inputs, 4.8 kHz max output data rate, 11 nV RMS noise at 4.7 Hz (gain = 128), and simultaneous 50/60 Hz rejection - deployed in high-precision industrial PLC analog input modules and weigh scale front ends.

For engineers reviewing the AD7194BCPZ-REEL datasheet, AD7194BCPZ-REEL pinout, AD7194BCPZ-REEL application, or AD7194BCPZ-REEL equivalent, key selection criteria include noise performance at low output data rates, programmable gain (1–128), internal/external clock flexibility, 4.7 Hz to 4.8 kHz data rate range, and simultaneous 50/60 Hz line rejection capability for noisy industrial environments.

Technical Context

The AD7194BCPZ-REEL implements a 24-bit sigma-delta modulator with on-chip programmable gain amplifier (PGA) and flexible digital filter architecture including Sinc3, Sinc4, and fast-settling modes. It supports both internal 4.92 MHz clock and external crystal/clock sources, enabling precise timing control across varying system requirements.

Dual reference inputs (REFIN1±, REFIN2±), configurable unipolar/bipolar operation, and four general-purpose digital outputs (P0–P3) allow direct interface with transducer signal chains and host microcontrollers. The device features zero-latency mode for deterministic conversion timing and built-in burnout currents for open-wire detection.

Key Specifications

Pinout & Package

AD7194BCPZ-REEL is housed in a 32-lead LFCSP (5 mm × 5 mm, 0.8 mm height) with exposed pad connected to AGND for thermal and noise performance optimization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7194BCPZ-REEL, AD7177-2BRUZ offers superior resolution and noise but lacks multi-channel capability and PGA, while ADS1263IPBSR adds diagnostics and internal references at the cost of higher current draw and reduced temperature rating - making AD7194BCPZ-REEL optimal for space-constrained, multi-sensor industrial modules requiring robust 105°C operation and flexible gain.

Availability

AD7194BCPZ-REEL is available at Aetrix Electronics and suitable for PLC/DCS analog input modules, weigh scales, and pressure transmitters requiring stable component supply across long-lifecycle industrial programs.

Supply support for AD7194BCPZ-REEL 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 AD7194BCPZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-resolution industrial measurement systems demanding low noise, high CMRR, and robust 50/60 Hz rejection in harsh electromagnetic environments.

FAQ

What is the maximum output data rate supported by the AD7194BCPZ-REEL?

The AD7194BCPZ-REEL supports an output data rate range of 4.7 Hz to 4.8 kHz. At the upper limit of 4.8 kHz, the device delivers 24-bit no-missing-codes performance with Sinc4 filter and chop disabled. This maximum rate is achievable with internal clock operation and gain = 1 configuration, making AD7194BCPZ-REEL suitable for high-throughput applications such as fast-scan chromatography detectors.

Does the AD7194BCPZ-REEL support simultaneous 50 Hz and 60 Hz line frequency rejection?

Yes, the AD7194BCPZ-REEL supports simultaneous 50 Hz and 60 Hz rejection via its programmable digital filter. When the REJ60 bit in the mode register is set to 1, the sinc filter places notches at both frequencies, delivering 120 dB rejection at each - confirmed in Table 1 under Common-Mode Rejection. This feature eliminates the need for external hardware filters in globally deployed industrial equipment.

What package type and thermal characteristics does the AD7194BCPZ-REEL use?

The AD7194BCPZ-REEL is packaged in a 32-lead LFCSP (5 mm × 5 mm, 0.8 mm height) with exposed pad. Its thermal resistance is θJA = 32.5°C/W and θJC = 32.71°C/W, as specified in Table 4. The exposed pad must be soldered to AGND for optimal thermal dissipation and noise performance - critical for maintaining 11 nV RMS noise in precision measurement applications.

Can the AD7194BCPZ-REEL operate with separate analog and digital supply voltages?

Yes, the AD7194BCPZ-REEL supports independent analog and digital supplies: AVDD ranges from 3 V to 5.25 V, and DVDD ranges from 2.7 V to 5.25 V. This separation allows mixed-voltage system design - for example, AVDD = 5 V for optimal analog performance while DVDD = 3.3 V interfaces with a 3.3 V microcontroller. The absolute maximum ratings confirm AVDD and DVDD may differ by up to 2.25 V without risk.

How many analog input channels does the AD7194BCPZ-REEL support, and how are they configured?

The AD7194BCPZ-REEL supports up to eight differential input channels or sixteen pseudo-differential channels, selectable via the CONFIG register's pseudo bit. Pins AIN1–AIN16 serve as analog inputs, with AINCOM acting as the common reference for pseudo-differential mode. Channel selection is controlled by the on-chip multiplexer, and the device includes internal burnout currents for open-wire detection on all inputs.