Analog Devices Inc. ADUC847BSZ8-3

Overview

ADUC847BSZ8-3 from Analog Devices is a 24-bit Σ-Δ ADC MicroConverter IC integrating an 8051-compatible single-cycle MCU, 62 kB Flash/EE program memory, 4 kB Flash/EE data memory, and 2304 bytes RAM. It features one 24-bit primary ADC with up to 10 input channels, 12-bit voltage-output DAC, dual 16-bit Σ-Δ DACs, UART/SPI/I²C interfaces, and operates from 2.7–3.6 V or 4.75–5.25 V supply. Used in high-precision industrial sensor monitoring and portable instrumentation.

For engineers reviewing the ADUC847BSZ8-3 datasheet, ADUC847BSZ8-3 pinout, ADUC847BSZ8-3 application, or ADUC847BSZ8-3 equivalent, key selection criteria include 24-bit no-missing-codes ADC resolution, on-chip 62 kB Flash with 100-year retention, 1.57 MHz core clock at 3.6 V (4.8 mA typical), −40°C to +125°C operation in 52-lead MQFP, and integrated excitation current sources for bridge sensor biasing.

Technical Context

The ADUC847BSZ8-3 implements a high-accuracy Σ-Δ ADC architecture with programmable gain amplifier (PGA), chop-stabilized offset drift of 10 nV/°C, and 22-bit rms effective resolution. Its 8051-based MCU core runs at up to 12.58 MHz via on-chip PLL and supports three 16-bit timers, dual data pointers, and extended 11-bit stack pointer.

It integrates dual excitation current sources (200 μA each), a temperature-compensated internal 1.25 V reference (±1% initial tolerance), and supports external references up to AVDD. The ADC supports bipolar/unipolar modes, selectable update rates from 5.4 Hz to 1365 Hz, and includes hardware rejection of 50/60 Hz interference with REJ60 bit enabled.

Key Specifications

Pinout & Package

ADUC847BSZ8-3 is housed in a 52-lead MQFP package (14 mm × 14 mm), lead-free and RoHS-compliant, rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision ADC + MCU applications.

Compared with ADUC847BSZ8-3, ADUC848BSZ8-3 trades 24-bit ADC resolution for lower cost and same footprint, while ADUCM360BCPZ-RL7 offers modern ARM compute but requires external biasing for bridge sensors and lacks the integrated dual 200 μA sources.

Availability

ADUC847BSZ8-3 is available at Aetrix Electronics and suitable for industrial weigh scales, portable environmental sensors, pressure transmitter calibration tools, and high-precision data loggers requiring stable component supply across extended temperature ranges.

Supply support for ADUC847BSZ8-3 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 ADuC847 is part of Analog Devices' MicroConverter® family-designed specifically for precision sensor signal conditioning and embedded control in space- and power-constrained industrial and instrumentation systems.

FAQ

What is the maximum ADC conversion rate of the ADUC847BSZ8-3 with chopping enabled?

The ADUC847BSZ8-3 achieves a maximum primary ADC conversion rate of 105 Hz when chopping is enabled (ADCMODE.3 = 0). This mode delivers 24-bit no-missing-codes performance with 10 nV/°C offset drift, optimized for high-precision DC measurements such as strain gauge or RTD readouts where noise rejection is critical. At this rate, effective resolution reaches 22-bit rms.

Does the ADUC847BSZ8-3 support external reference inputs, and what voltage range is acceptable?

Yes, the ADUC847BSZ8-3 supports external reference inputs via REFIN+ and REFIN− pins. It accepts reference voltages from 1 V up to AVDD (2.7–3.6 V or 4.75–5.25 V), enabling ratiometric measurements against stable external references like precision voltage references or sensor bridges. Internal 1.25 V reference is also available with ±1% initial tolerance and 100 ppm/°C tempco.

How many analog input channels does the ADUC847BSZ8-3 support, and are they configurable for differential operation?

The ADUC847BSZ8-3 supports up to 10 analog input channels (AIN1–AIN10) with AINCOM as common-mode reference. All channels are configurable for true differential operation using the internal programmable gain amplifier (PGA), supporting bipolar (±VREF/GAIN) or unipolar (0–VREF/GAIN) input ranges. Channel selection is controlled via ADC0CON2 register.

What is the Flash memory endurance and data retention specification for the ADUC847BSZ8-3?

The ADUC847BSZ8-3 features 62 kB of on-chip Flash/EE program memory and 4 kB of Flash/EE data memory, both rated for 100,000 write/erase cycles and 100 years of data retention at 55°C junction temperature. These specifications are validated per JEDEC Std. 22 methods A117 and apply across the full operating temperature range (−40°C to +125°C).

Can the ADUC847BSZ8-3 generate excitation currents for 4-wire RTD measurements, and what are their matching specifications?

Yes, the ADUC847BSZ8-3 integrates two matched excitation current sources (IEXC1 and IEXC2), each delivering 200 μA with ±10% initial tolerance and <200 ppm/°C drift. At 25°C, current matching is ±1%, and drift matching is 20 ppm/°C-enabling accurate 4-wire RTD measurements without external current sources or trimming components.