Analog Devices Inc. AD7712SQ

Overview

AD7712SQ from Analog Devices is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for precision low-frequency signal conditioning in industrial measurement systems. It features dual analog input channels (AIN1 differential low-level, AIN2 single-ended high-level), programmable gain (1–128), on-chip 2.5 V reference, and digital filtering with selectable notch frequencies up to 1 kHz - enabling direct interface with strain gauges and transducers in smart transmitter applications.

For engineers reviewing the AD7712SQ datasheet, AD7712SQ pinout, AD7712SQ application, or AD7712SQ equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with functional distinctions, and supply-ready availability details - all grounded in Analog Devices' official REV. F documentation.

Technical Context

The AD7712SQ implements a charge-balancing sigma-delta architecture with an analog modulator followed by an on-chip digital filter whose first notch frequency is software-programmable via the control register. It supports both self-clocking (via internal SCLK generation) and external clocking modes, with master clock input (MCLK IN) ranging from 400 kHz to 10 MHz depending on supply voltage.

Its dual-input architecture separates low-level transducer signals (AIN1±, PGA-gain configurable) from high-level ±4 VREF/GAIN inputs (AIN2), each with independent calibration registers. The device integrates self-, system-, and background calibration modes, and supports bidirectional serial communication using TFS/RFS frame sync and SDATA/SCLK lines under MODE-controlled protocol selection.

Key Specifications

Pinout & Package

AD7712SQ is supplied in a 24-lead CERDIP (Q-24) package - hermetically sealed, suitable for extended temperature operation (–55°C to +125°C) and high-reliability industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7712SQ, AD7714BRUZ offers more input channels but requires external reference and lacks hardware power-down, while ADS1258IPWR provides higher channel density and speed but sacrifices programmable notch filtering and ultra-low standby power - making AD7712SQ uniquely suited for low-power, high-rejection industrial transmitters.

Availability

AD7712SQ is available at Aetrix Electronics and suitable for smart transmitter design, portable instrumentation development, and process control system integration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7712SQ 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 AD7712SQ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency industrial measurement applications demanding 24-bit resolution, low drift, and robust 50/60 Hz interference rejection in harsh environments.

FAQ

What is the operating temperature range of the AD7712SQ?

The AD7712SQ is qualified for operation from –55°C to +125°C, as specified in the Analog Devices ordering guide for the S-grade version. This extended temperature range is enabled by its CERDIP (Q-24) hermetic package and internal design hardening, making it suitable for aerospace, downhole, and military applications where commercial-grade parts would fail.

Does the AD7712SQ include an internal voltage reference?

Yes, the AD7712SQ includes an internal 2.5 V bandgap reference available at the REF OUT pin, with ±1% initial tolerance and 20 ppm/°C typical drift. This reference can be used to excite sensors or serve as a stable reference for the ADC itself, eliminating the need for an external reference IC in many designs - though the device also supports external differential reference inputs (REF IN±) for higher precision.

How does the AD7712SQ handle 50 Hz and 60 Hz power-line interference?

The AD7712SQ achieves ≥100 dB rejection of 50 Hz and 60 Hz interference through its programmable digital filter notch. When configured for notch frequencies of 10 Hz, 25 Hz, 50 Hz, or 30 Hz/60 Hz respectively, the filter's first notch provides deep attenuation at those exact frequencies - a feature critical for industrial environments with strong AC magnetic fields or noisy power supplies.

Can the AD7712SQ interface directly with a strain gauge bridge?

Yes, the AD7712SQ is explicitly designed for direct strain gauge interface via its AIN1(±) differential input channel. With programmable gain up to 128× and built-in 4.5 µA burnout current source (controllable via register), it supports ratiometric measurement, open-wire detection, and high-resolution digitization of mV-level bridge outputs without external amplification or discrete current sources.

What power supply configurations does the AD7712SQ support?

The AD7712SQ supports flexible power supply configurations: AVDD (+5 V to +10 V), DVDD (+5 V), and VSS (0 V or –5 V). It operates in single-supply mode (VSS = AGND) for inputs > –30 mV, or dual-supply mode (VSS = –5 V) to support bipolar inputs down to –VREF on AIN1. Power dissipation is 25 mW typical in active mode and 100 µW typical in hardware STANDBY mode.