Analog Devices Inc. AD7194BCPZ

Overview

AD7194BCPZ from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, designed for high-precision analog front-end acquisition in industrial measurement systems. It delivers 11 nV RMS noise at 4.7 Hz (gain = 128), supports up to 8 differential or 16 pseudo-differential inputs, and operates from 3 V to 5.25 V AVDD with 4.65 mA total current draw - enabling direct interface to low-level transducer signals in PLC analog input modules.

For engineers reviewing the AD7194BCPZ datasheet, AD7194BCPZ pinout, AD7194BCPZ application, or AD7194BCPZ equivalent, key selection criteria include simultaneous 50/60 Hz rejection capability, programmable gain (1–128), fast-settling digital filter options, and guaranteed 24-bit no-missing-codes performance across its 4.7 Hz–4.8 kHz output data rate range.

Technical Context

The AD7194BCPZ implements a fourth-order sinc4 modulator with configurable chop mode and selectable filter types (sinc3/sinc4/fast settling), enabling trade-offs between noise, settling time, and line frequency rejection. Its on-chip 4.92 MHz clock supports internal timing or external crystal/clock synchronization via MCLK1/MCLK2 pins.

Digital interface compliance includes SPI, QSPI™, MICROWIRE™, and DSP protocols with Schmitt-triggered SCLK for noise immunity; the DOUT/RDY pin serves dual roles as serial data output and conversion-ready interrupt signal, while four general-purpose outputs (P0–P3) support system-level control functions.

Key Specifications

Pinout & Package

AD7194BCPZ is housed in a 32-lead LFCSP (Lead Frame Chip Scale Package) 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 AD7177-2BRUZ and ADS1258IRTCR, the AD7194BCPZ uniquely balances integrated PGA, multi-channel configurability, and hardware-accelerated 50/60 Hz rejection - making it optimal for cost-sensitive, space-constrained industrial DAQ where transducer-level signal conditioning and noise immunity are co-required.

Availability

AD7194BCPZ is available at Aetrix Electronics and suitable for PLC/DCS analog input modules, weigh scales, and chromatography systems requiring stable component supply across extended product lifecycles and industrial temperature ranges.

Supply support for AD7194BCPZ 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 industrial, automotive, and communications markets.

The AD7194BCPZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-resolution, low-drift measurement in harsh industrial environments - emphasizing noise performance, line-frequency immunity, and system-level integration.

FAQ

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

The AD7194BCPZ supports an output data rate range of 4.7 Hz to 4.8 kHz depending on filter configuration and chop mode. At 4.8 kHz, the device operates with sinc3 filter and chop disabled; lower rates enable higher resolution and improved noise performance, such as 11 nV RMS noise at 4.7 Hz with gain = 128. The AD7194BCPZ maintains guaranteed 24-bit no-missing-codes performance across this entire range.

Does the AD7194BCPZ require an external reference voltage?

No, the AD7194BCPZ can operate with AVDD as its reference source (ratiometric mode), but it also supports external references applied to REFIN1(±) or REFIN2(±) pins. The nominal reference voltage range is 1 V to AVDD, and the part includes reference detect circuitry that monitors REFINx levels (0.3 V–0.6 V thresholds) to prevent invalid conversions. This dual-reference capability makes the AD7194BCPZ adaptable to both cost-sensitive and high-accuracy system designs.

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

The AD7194BCPZ supports up to eight differential input channels or sixteen pseudo-differential input channels, selected via the pseudo bit in the configuration register. Inputs are routed through an internal multiplexer to the sigma-delta modulator, with AINCOM serving as the common reference point in pseudo-differential mode. Channel selection, gain, filter type, and data rate are all programmable via on-chip registers accessed through the SPI-compatible serial interface.

What package type is used for the AD7194BCPZ, and what is its thermal performance?

The AD7194BCPZ is packaged in a 32-lead LFCSP (CP-32-12) with an exposed pad that must be soldered to AGND for optimal thermal dissipation and noise performance. Its thermal resistance is θJA = 32.5°C/W and θJC = 32.71°C/W, enabling reliable operation at full rated current (4.65 mA) across the −40°C to +105°C industrial temperature range without forced airflow or heatsinking in typical PCB layouts.

Can the AD7194BCPZ perform simultaneous 50 Hz and 60 Hz rejection without external components?

Yes, the AD7194BCPZ provides hardware-based simultaneous 50 Hz and 60 Hz rejection through its configurable sinc filter architecture. When the REJ60 bit is set in the mode register, the first notch of the sinc filter is placed at 50 Hz and a second notch automatically appears at 60 Hz - delivering ≥120 dB rejection at both frequencies with no external filters or firmware intervention required. This feature is validated across all supported output data rates and gain settings.