Analog Devices Inc. AD7190WBRUZ

Overview

AD7190WBRUZ from Analog Devices is a 24-bit sigma-delta ADC with integrated PGA, designed for high-precision DC and low-frequency AC measurement in industrial and automotive systems. It delivers 8.5 nV RMS noise at 4.7 Hz (gain = 128), supports up to 4.8 kHz output data rate, features 2 differential or 4 pseudo-differential inputs, and operates across –40°C to +105°C.

For engineers reviewing the AD7190WBRUZ datasheet, AD7190WBRUZ pinout, AD7190WBRUZ application, or AD7190WBRUZ equivalent, key selection criteria include its ultralow offset drift (5 nV/°C), simultaneous 50 Hz/60 Hz rejection, 4.92 MHz internal clock, and automotive-qualified 24-lead TSSOP package.

Technical Context

The AD7190WBRUZ implements a sinc4/sinc3 digital filter architecture with configurable chop mode to optimize noise vs. settling time trade-offs. Its on-chip PGA supports programmable gain from 1 to 128, enabling direct interface with low-level transducer outputs such as strain gauges and RTDs without external amplification.

It integrates dual reference inputs (REFIN1 and REFIN2), a bridge power-down switch (BPDSW), four general-purpose digital outputs (P0–P3), and a SYNC input for multi-device synchronization. The device uses a 3-wire SPI-compatible serial interface with Schmitt-triggered SCLK for robust noise immunity in industrial environments.

Key Specifications

Pinout & Package

Housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch), the AD7190WBRUZ provides full signal, power, and control isolation between analog and digital domains via separate AVDD/AGND and DVDD/DGND pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7190WBRUZ, AD7177-2BRUZ trades integrated PGA and low-noise optimization for raw resolution and speed, while ADS1256IPWR offers higher sample rates and broader temperature tolerance but lacks automotive qualification and built-in notch filtering-making AD7190WBRUZ uniquely balanced for noise-sensitive, mains-immune, automotive-grade measurement.

Availability

AD7190WBRUZ is available at Aetrix Electronics and suitable for weigh scales, pressure transmitters, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for AD7190WBRUZ 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 AD7190WBRUZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-stability, low-drift measurement in harsh industrial and automotive environments.

FAQ

What is the maximum achievable noise-free resolution of the AD7190WBRUZ?

The AD7190WBRUZ achieves up to 22.5 noise-free bits at gain = 1 with sinc4 filter and chop disabled. This corresponds to ~3.8 µV peak-to-peak noise at 4.7 Hz output data rate using a 5 V reference. At gain = 128, it delivers 16 noise-free bits at 2.4 kHz-enabling high-speed precision in dynamic weighing and vibration monitoring applications where the AD7190WBRUZ's internal PGA eliminates external op-amp stages.

Does the AD7190WBRUZ support true differential input configuration?

Yes, the AD7190WBRUZ supports two independent fully differential input channels: AIN1/AIN2 and AIN3/AIN4. Each pair accepts differential signals up to ±VREF/gain, with common-mode voltage range extending from AGND − 50 mV to AVDD + 50 mV in unbuffered mode. This capability is explicitly confirmed in the "Analog Input Channel" section of the Rev. C datasheet and enables direct connection to Wheatstone bridges and isolated current-sense amplifiers without level-shifting circuitry-core to the AD7190WBRUZ's role in precision sensor interfaces.

How does the AD7190WBRUZ handle 50 Hz and 60 Hz interference rejection?

The AD7190WBRUZ implements hardware-based simultaneous 50 Hz and 60 Hz rejection using its sinc4 or sinc3 digital filters with configurable notch placement. When configured for 10 Hz output data rate, it achieves ≥120 dB rejection at both frequencies using the internal clock; with external clock, rejection remains ≥120 dB. This is not post-processing-it occurs inherently during conversion, eliminating the need for firmware-based DFT or dual-sampling schemes. The AD7190WBRUZ datasheet confirms this behavior in Table 1 under "Common-Mode Rejection @ 50 Hz, 60 Hz" and "Normal Mode Rejection," making it ideal for use in globally deployed equipment subject to variable mains standards.

Can the AD7190WBRUZ operate with a single 3.3 V supply?

No-the AD7190WBRUZ requires separate analog and digital supplies: AVDD must be 4.75 V to 5.25 V (nominal 5 V), while DVDD accepts 2.7 V to 5.25 V. A 3.3 V DVDD is supported, but AVDD cannot be reduced below 4.75 V. This constraint is specified in the Absolute Maximum Ratings (Table 3) and Power Requirements (Page 6) sections of the datasheet. Attempting to power AVDD at 3.3 V violates the device's design envelope and will compromise PGA linearity, reference stability, and noise performance-key attributes defining the AD7190WBRUZ's value proposition.

Is the AD7190WBRUZ pin-compatible with other members of the AD719x family?

Yes-the AD7190WBRUZ shares identical pinout, package (24-lead TSSOP), and register map with AD7192WBRUZ and AD7193WBRUZ. Differences lie in internal feature sets: AD7190WBRUZ includes both sinc3 and sinc4 filters with zero-latency mode, while AD7192 omits sinc3 and zero-latency, and AD7193 adds additional GPIOs. All three support the same 2/4-channel configurations, PGA range, and timing interface. This pin compatibility allows drop-in replacement during design iteration or qualification-confirmed by Analog Devices' Pin Compatibility Matrix in Application Note AN-1295 and the shared "Pin Configuration and Function Descriptions" section across all AD719x datasheets.