Analog Devices Inc. AD7194BCPZ-REEL7

Overview

AD7194BCPZ-REEL7 from Analog Devices is a 24-bit sigma-delta 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-designed for high-precision industrial measurement systems such as PLC analog input modules and weigh scales.

For engineers reviewing the AD7194BCPZ-REEL7 datasheet, AD7194BCPZ-REEL7 pinout, AD7194BCPZ-REEL7 application, or AD7194BCPZ-REEL7 equivalent, key selection considerations include noise performance at low output rates, programmable gain (1–128), internal/external clock flexibility, 32-lead LFCSP package constraints, and SPI-compatible 3-wire interface timing compliance.

Technical Context

The AD7194BCPZ-REEL7 implements a sinc4/sinc3 digital filter architecture with selectable chop mode, enabling zero-latency operation and fast settling options. Its on-chip PGA supports gain settings from 1 to 128, and reference detection circuitry allows dual reference inputs (REFIN1, REFIN2) with configurable polarity and buffering.

It features four general-purpose digital outputs (P0–P3), a dedicated SYNC pin for multi-device synchronization, and independent AVDD (3–5.25 V) and DVDD (2.7–5.25 V) supplies. The internal 4.92 MHz clock can be routed to MCLK2 or bypassed for external crystal/clock input via MCLK1/MCLK2 pins.

Key Specifications

Pinout & Package

AD7194BCPZ-REEL7 is housed in a 32-lead LFCSP (5 mm × 5 mm, 0.8 mm height) with exposed pad connected to AGND. Pin functions support flexible analog routing, reference selection, and digital control-including dual reference inputs, SYNC for multi-ADC synchronization, and DOUT/RDY dual-function pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7194BCPZ-REEL7, AD7177-2BRUZ delivers superior resolution and noise floor but sacrifices channel density and integrated signal conditioning, while ADS1256IDBT offers higher speed and lower cost at the expense of robustness in electrically noisy environments.

Availability

AD7194BCPZ-REEL7 is available at Aetrix Electronics and suitable for PLC/DCS analog input modules, strain gauge transducer interfaces, and medical instrumentation requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7194BCPZ-REEL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The AD7194BCPZ-REEL7 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for industrial process control, scientific instrumentation, and high-fidelity sensor signal conditioning where noise, drift, and reliability are critical.

FAQ

What is the maximum output data rate supported by the AD7194BCPZ-REEL7?

The AD7194BCPZ-REEL7 supports a maximum output data rate of 4.8 kHz when chop mode is disabled and the sinc4 filter is selected. At this rate, noise performance degrades to ~1.5 µV RMS, but it enables faster response in dynamic measurement applications such as flow metering or vibration analysis where latency matters more than ultra-low noise.

Does the AD7194BCPZ-REEL7 require an external crystal to operate?

No, the AD7194BCPZ-REEL7 includes an internal 4.92 MHz clock that can drive the ADC core without external components. An external crystal may be connected between MCLK1 and MCLK2 only if tighter frequency stability or synchronization across multiple AD7194BCPZ-REEL7 devices is required-otherwise, the internal clock suffices for most industrial applications.

How many analog input channels does the AD7194BCPZ-REEL7 support in differential mode?

The AD7194BCPZ-REEL7 supports up to eight fully differential input channels (AIN1–AIN8 paired with AINCOM, plus AIN9–AIN16). When configured for pseudo-differential mode using AINCOM as the common reference, it supports up to 16 single-ended inputs-providing flexibility for mixed-sensor systems in compact PLC modules.

What is the purpose of the SYNC pin on the AD7194BCPZ-REEL7?

The SYNC pin on the AD7194BCPZ-REEL7 resets the digital filter states and analog modulator across all instances when pulled low, enabling precise time-aligned sampling across multiple AD7194BCPZ-REEL7 devices. This is essential for phase-coherent multi-channel acquisition in power quality analyzers or synchronized sensor arrays.

Can the AD7194BCPZ-REEL7 perform simultaneous 50 Hz and 60 Hz rejection without external filtering?

Yes, the AD7194BCPZ-REEL7 achieves simultaneous 50 Hz and 60 Hz rejection through its programmable digital filter-specifically when REJ60 = 1 in the mode register, which places notches at both frequencies. This hardware-based rejection operates independently of external analog filters and maintains 120 dB attenuation at both frequencies under specified conditions.