Analog Devices Inc. ADUC814ARU

Overview

ADUC814ARU from Analog Devices is a fully integrated MicroConverter® combining a 12-bit, 247 kSPS multichannel ADC, dual 12-bit DACs, and an 8052-compatible 8-bit MCU with 8 kB Flash/EE program memory and 640 bytes Flash/EE data memory in a single 28-lead TSSOP package. It operates from 3 V or 5 V across −40°C to +125°C and supports laser power control, precision sensor conditioning, and battery-powered system monitoring.

For engineers reviewing the ADUC814ARU datasheet, ADUC814ARU pinout, ADUC814ARU application, or ADUC814ARU equivalent, key selection considerations include its on-chip PLL (16.78 MHz max), programmable 2.5 V reference, temperature monitor (±1.5°C accuracy), UART/SPI/I²C serial interfaces, and 11 programmable I/O lines with interrupt support.

Technical Context

The ADUC814ARU integrates an 8052-based core with three 16-bit timer/counters, a wake-up/RTC timer, watchdog timer, and power supply monitor. Its ADC features 6-channel multiplexing, high-speed data capture mode, and factory-calibrated offset/gain error matching (≤1 LSB typ).

Analog subsystem includes dual voltage-output DACs (12-bit, 15 µs settling), internal band gap reference (2.5 V ±2.5%), and configurable external reference input (1.0 V to VDD). Digital peripherals support in-circuit serial download via UART and single-pin emulation via DLOAD.

Key Specifications

Pinout & Package

ADUC814ARU is housed in a 28-lead TSSOP package (4.4 mm × 9.7 mm), fully specified for −40°C to +125°C operation. Pin assignments are validated per Analog Devices Rev. A datasheet Figure 2 and Table 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixed-signal microcontroller applications.

Compared with ADUC814ARU, ADUC7024BCPZ62 offers greater compute headroom but higher power and cost, while MAX11270ETJ+ delivers superior resolution at the expense of system integration - ADUC814ARU uniquely balances 12-bit precision, embedded control, and ultra-low-power operation in a 28-pin TSSOP.

Availability

ADUC814ARU is available at Aetrix Electronics and suitable for optical networking, base station power control, and precision instrument applications requiring stable component supply and long-term industrial temperature support.

Supply support for ADUC814ARU 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, founded in 1965 and headquartered in Wilmington, MA.

The ADuC814 belongs to the MicroConverter® family - designed specifically to integrate precision data acquisition, signal conditioning, and embedded control in space-constrained industrial and communications systems.

FAQ

What is the maximum ADC sampling rate supported by the ADUC814ARU?

The ADUC814ARU supports a maximum ADC sampling rate of 247 kSPS in standard mode and 147 kSPS in calibrated high-accuracy mode. This rate is achievable with the internal 2.5 V reference and applies to all six analog input channels. The ADC maintains 12-bit resolution and ≤2 LSB integral nonlinearity at 147 kSPS, making it suitable for medium-speed sensor monitoring and closed-loop control applications where timing determinism is critical.

Does the ADUC814ARU support external reference voltage, and what is the valid input range?

Yes, the ADUC814ARU supports external reference voltage applied to the VREF/CREF pins. The valid input range is 1.0 V minimum to DVDD maximum, with input impedance of 20 kΩ and leakage current ≤10 µA. When using an external reference, the internal band gap reference must be disabled via ADCCON1.6 bit. This configuration allows full-scale ADC conversion ranges aligned to system-specific analog rails, such as 1.0 V for low-voltage sensor interfaces or 3.3 V for industrial 0–3.3 V signals.

How many I/O pins does the ADUC814ARU provide, and which ones support analog functions?

The ADUC814ARU provides 11 programmable digital I/O lines: Port 1 (P1.0–P1.7) and Port 3 (P3.0–P3.4, P3.6–P3.7). Of these, P1.2 through P1.7 serve as the six-channel analog input multiplexer (ADC0–ADC5), and P1.6/P1.7 double as DAC0/DAC1 outputs. All digital I/O pins feature internal pull-ups and support interrupt generation. No additional GPIOs are available beyond these 11 pins, and analog functionality is strictly limited to the designated P1.x pins - no other pins accept analog signals.

What are the power supply requirements and operating voltage ranges for the ADUC814ARU?

The ADUC814ARU operates from a single supply with AVDD and DVDD tied together at either 3 V (2.7–3.3 V) or 5 V (4.5–5.5 V). Both supplies must remain within 0.3 V of each other, and AGND and DGND are internally shorted. Total supply current ranges from 15 µA in power-down mode (32 kHz oscillator active) to 20 mA at 16.78 MHz core clock and 5 V supply. The device is fully specified across −40°C to +125°C, with guaranteed performance at both voltage rails without derating.

Can the ADUC814ARU perform in-system programming, and what interface is used?

Yes, the ADUC814ARU supports in-circuit serial download (programming and debugging) via its UART interface using the on-chip factory firmware. No external hardware programmer is required - only a UART-to-USB bridge and Analog Devices' QuickStart™ Development System software. Programming is performed through pins P3.0 (RxD) and P3.1 (TxD), with DLOAD (Pin 2) used to enter download mode at power-on or reset. Flash memory endurance is rated at 100,000 cycles with 100-year data retention, enabling reliable field updates in deployed equipment.