Analog Devices Inc. AD7719BRUZ-REEL7

Overview

AD7719BRUZ-REEL7 from Analog Devices is a factory-calibrated, dual-channel Σ-Δ analog front-end IC integrating a 24-bit main ADC and 16-bit auxiliary ADC, programmable gain amplifier (PGA), dual 200 µA excitation current sources, low-side power switches, on-chip temperature sensor, and 4-bit digital I/O port. It operates from single 3 V or 5 V supply, delivers simultaneous 50/60 Hz rejection at 20 Hz update rate, and targets precision sensor measurement in portable instrumentation and industrial transmitters.

For engineers reviewing the AD7719BRUZ-REEL7 datasheet, AD7719BRUZ-REEL7 pinout, AD7719BRUZ-REEL7 application, or AD7719BRUZ-REEL7 equivalent, key selection criteria include dual-channel resolution (24-/16-bit), simultaneous sampling capability, ±13-bit p-p noise performance at ±20 mV/20 Hz, rail-to-rail input buffer, and TSSOP-28 package compatibility with legacy SOIC footprints.

Technical Context

The AD7719BRUZ-REEL7 implements two independent Σ-Δ modulators with separate reference inputs (REFIN1 for main channel, REFIN2 for auxiliary), programmable gain (1–128), and software-selectable unipolar/bipolar operation. Its on-chip PLL locks to a 32.768 kHz crystal to generate internal clocks, enabling precise timing control for synchronized conversion cycles.

It integrates switchable excitation current sources (IEXC1/IEXC2) with ±1% matching and 200 ppm/°C drift, low-side power switches (SW1/SW2) with 3–7 Ω R_ON, and reference detect circuitry that asserts NOXREF when REFIN falls below 0.3 V - all managed via eight on-chip configuration registers accessible through a 3-wire SPI-compatible serial interface.

Key Specifications

Pinout & Package

AD7719BRUZ-REEL7 is housed in a 28-lead TSSOP package (RU-28), pin-compatible with the SOIC-28 AD7719BR variant and optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7719BRUZ-REEL7, AD7190BRUZ offers superior noise performance but lacks dual-channel synchronization and sensor excitation, while ADS1258IPWR provides higher channel count and speed at the expense of on-chip analog support - making AD7719BRUZ-REEL7 uniquely suited for compact, self-contained dual-sensor front ends.

Availability

AD7719BRUZ-REEL7 is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, weigh scales, and 4–20 mA transmitters requiring stable component supply, long-term manufacturability, and guaranteed traceability.

Supply support for AD7719BRUZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7719 belongs to Analog Devices' precision Σ-Δ ADC product line, designed specifically for low-frequency, high-resolution sensor signal conditioning in industrial, instrumentation, and portable measurement applications.

FAQ

What is the maximum update rate for simultaneous operation of both ADCs in AD7719BRUZ-REEL7?

The AD7719BRUZ-REEL7 supports simultaneous sampling and conversion of both channels at an output update rate ranging from 5.4 Hz to 105 Hz in 0.732 ms increments. At 20 Hz, it achieves 13-bit p-p resolution for ±20 mV inputs and 18-bit p-p for ±2.56 V inputs - critical for real-time industrial monitoring where synchronized dual-sensor capture is required without inter-channel skew.

Does AD7719BRUZ-REEL7 require external calibration during system deployment?

No, AD7719BRUZ-REEL7 is factory-calibrated at 25°C with 4 V supplies and 2.5 V reference, eliminating field calibration for most applications. System zero and full-scale calibrations remain optional to correct for user-specific supply voltage or temperature deviations - but the AD7719BRUZ-REEL7 delivers specified ±10 ppm INL and ±3 µV offset error without them.

How does the reference detect function operate in AD7719BRUZ-REEL7?

The AD7719BRUZ-REEL7 monitors REFIN1 voltage continuously: the NOXREF bit in the status register asserts when REFIN1 drops below 0.3 V and clears when above 0.65 V. This hardware-level detection enables immediate fault response - such as disabling conversions or triggering alarms - without firmware polling, ensuring robust operation in systems with unstable reference supplies.

Can AD7719BRUZ-REEL7 drive a 3-wire RTD directly without external components?

Yes, AD7719BRUZ-REEL7 integrates two matched 200 µA excitation current sources (IEXC1/IEXC2), low-side power switches (SW1/SW2), and a rail-to-rail input buffer - enabling direct 3-wire RTD connection. The excitation sources can be routed to IOUT1/IOUT2 and switched to AIN1–AIN4, while the on-chip PGA configures gain to match RTD resistance ranges, eliminating discrete op-amps and current sources.

What digital interface protocols does AD7719BRUZ-REEL7 support?

AD7719BRUZ-REEL7 features a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols. It uses CS, SCLK, DIN, DOUT, and RDY signals - with Schmitt-triggered SCLK for noise immunity - and supports both CS-decoded and CS-tied-low modes. The interface is register-mapped via an 8-register set, allowing full configuration and data readback without external glue logic.