Analog Devices Inc. AD7892BR-1

Overview

AD7892BR-1 from Analog Devices is a 12-bit, single-supply successive approximation ADC with ±5 V or ±10 V input range, 500 kSPS throughput, ±1 LSB relative accuracy, and dual serial/parallel interface - used in precision data acquisition systems for industrial process monitoring and sensor signal digitization.

For engineers reviewing the AD7892BR-1 datasheet, AD7892BR-1 pinout, AD7892BR-1 application, or AD7892BR-1 equivalent, this page delivers verified electrical specs, SOIC-24 package mapping, real-world timing constraints, and validated alternative parts for embedded analog front-end design.

Technical Context

The AD7892BR-1 integrates an on-chip track/hold amplifier with 400 ns acquisition time, internal +2.5 V reference (±10 mV @ +25°C), and LC2MOS process architecture enabling bipolar input scaling without external op-amps. Its MODE pin selects between parallel (12-bit TTL-compatible DB0–DB11) and three-wire serial (RFS/SCLK/SDATA) interfaces.

Conversion is initiated by CONVST rising edge; EOC falling pulse signals completion (100 ns nominal width). The part operates at +5 V ±5% with 18 mA typical supply current and enters standby mode (<100 µA) when STANDBY is low - critical for power-constrained portable instrumentation.

Key Specifications

Pinout & Package

AD7892BR-1 is housed in a 24-lead SOIC (R-24) package with standard 0.3" width and 0.050" lead pitch. Thermal impedance θ_JA = 75°C/W enables operation up to +85°C ambient without derating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7892BN-1, AD7892BR-1 offers superior thermal performance in compact layouts; versus ADS7822U, it delivers higher throughput, integrated reference, and robust industrial input protection - making AD7892BR-1 optimal for ruggedized embedded data acquisition.

Availability

AD7892BR-1 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test equipment, and motor control feedback systems requiring stable component supply across extended product lifecycles.

Supply support for AD7892BR-1 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.

The AD7892 family was designed for high-speed, low-power, single-supply data acquisition in industrial, instrumentation, and embedded control applications - emphasizing precision, interface flexibility, and ruggedness.

FAQ

What input voltage ranges does the AD7892BR-1 support?

The AD7892BR-1 supports two selectable analog input ranges: ±10 V (when VIN2 is grounded) or ±5 V (when VIN2 is tied to VIN1). Both configurations maintain ±1 LSB relative accuracy and tolerate up to ±17 V on VIN1 without damage - essential for interfacing with industrial transducers subject to cable-induced transients.

How does the AD7892BR-1 handle reference voltage selection?

The AD7892BR-1 uses the REF OUT/REF IN pin for dual-purpose reference handling: internally, it provides a buffered +2.5 V reference (±10 mV @ +25°C); externally, it accepts 2.375–2.625 V sources like the AD780. When an external reference is applied, it overdrives the internal node - ensuring gain accuracy tracks the external reference's stability and temperature coefficient.

Can the AD7892BR-1 operate in both parallel and serial modes simultaneously?

No - the AD7892BR-1 operates exclusively in one interface mode at a time, selected by the MODE pin: high for parallel (DB0–DB11 active), low for serial (RFS/SCLK/SDATA active). In serial mode, pins DB8–DB11 must be left unconnected, and DB11/LOW and DB10/LOW must be tied low to avoid undefined behavior during conversion.

What is the minimum time required between conversions for the AD7892BR-1?

The AD7892BR-1 requires ≥400 ns between the EOC falling edge and the next CONVST rising edge - equal to its track/hold acquisition time. This ensures the internal sampling capacitor fully settles to ±1/2 LSB before the next hold command. Violating this interval degrades DC accuracy and introduces missing codes in high-speed streaming applications.

Does the AD7892BR-1 require external clock circuitry?

No - the AD7892BR-1 is self-clocked: conversion timing is governed entirely by internal logic and the CONVST trigger. No external crystal, oscillator, or clock generator is needed. In serial mode, however, an external SCLK signal (driven by the host MCU) is required to shift out data - but this is a data-transfer clock, not a conversion clock.