Analog Devices Inc. AD5303BRU-REEL

Overview

AD5303BRU-REEL from Analog Devices is a dual 8-bit buffered voltage-output DAC in a 16-lead TSSOP package, operating from 2.5 V to 5.5 V with 230 μA typical supply current at 3 V. It delivers rail-to-rail output swing (0 V to VDD), ±1 LSB INL (B version), and simultaneous DAC update via LDAC pin-ideal for digital gain/offset adjustment in portable instrumentation.

For engineers reviewing the AD5303BRU-REEL datasheet, AD5303BRU-REEL pinout, AD5303BRU-REEL application, or AD5303BRU-REEL equivalent, key selection considerations include its dual-channel 8-bit resolution, micropower operation (230 μA @ 3 V), rail-to-rail output buffer, 3-wire SPI-compatible interface, and guaranteed monotonicity across all codes.

Technical Context

The AD5303BRU-REEL implements two independent resistor-string DACs with on-chip reference buffers and rail-to-rail output amplifiers. Each DAC features separate reference inputs (VREFA/VREFB) configurable as buffered (input impedance >10 MΩ) or unbuffered (180 kΩ), enabling flexible gain scaling (0 V to VREF or 0 V to 2 VREF).

Its double-buffered 3-wire serial interface supports clock rates up to 30 MHz and is compatible with SPI, QSPI, MICROWIRE, and DSP standards. Power-on reset ensures outputs initialize to 0 V, while asynchronous CLR and LDAC pins enable deterministic zeroing and synchronized output updates without CPU intervention.

Key Specifications

Pinout & Package

AD5303BRU-REEL is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP) with 0.65 mm lead pitch, optimized for compact PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 8-bit DAC applications.

Compared with AD5303BRU-REEL, AD5302BRUZ-REEL7 reduces channel count and functionality to cut cost and size, while MAX522EUA+ trades micropower operation for broader vendor support-but neither matches the AD5303BRU-REEL's combination of dual-channel precision, rail-to-rail output, and 50 nA power-down.

Availability

AD5303BRU-REEL is available at Aetrix Electronics and suitable for portable instrumentation, digital calibration systems, and programmable analog sources requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD5303BRU-REEL 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD5303BRU-REEL belongs to Analog Devices' precision DAC product line, engineered specifically for low-power, high-accuracy analog control in space- and energy-constrained systems such as handheld test equipment and sensor signal conditioning modules.

FAQ

What is the maximum clock frequency supported by the AD5303BRU-REEL serial interface?

The AD5303BRU-REEL supports serial clock (SCLK) frequencies up to 30 MHz, enabling fast 16-bit writes in under 533 ns. This specification is valid across the full −40°C to +105°C operating temperature range and is compatible with standard SPI, QSPI, and MICROWIRE interfaces-ensuring seamless integration with common microcontrollers and DSPs without custom timing firmware.

Does the AD5303BRU-REEL require external reference components for operation?

No, the AD5303BRU-REEL does not require external reference components to function. It accepts external reference voltages applied directly to VREFA and VREFB pins, which may be configured as buffered (drawing <100 nA) or unbuffered (180 kΩ input impedance). The device itself contains no internal reference; reference accuracy and stability depend entirely on the external source connected to those pins.

How does the power-on reset behavior of the AD5303BRU-REEL ensure system reliability?

The AD5303BRU-REEL incorporates a hardware power-on reset circuit that forces both DAC outputs to 0 V at power-up and holds them there until the first valid write occurs. This prevents undefined analog transients during system startup-critical for protecting downstream circuitry like op-amps or ADC front-ends. The reset is independent of software initialization sequence, guaranteeing deterministic behavior even if firmware fails to execute.

Can the AD5303BRU-REEL generate bipolar output voltages?

Yes, the AD5303BRU-REEL can generate bipolar outputs when used with external op-amp circuitry. Its native output range is 0 V to VDD (unipolar), but application note AN-649 demonstrates how to configure it with an inverting summing amplifier and dual supplies to produce ±2.5 V outputs. This requires no modification to the AD5303BRU-REEL itself-only external passive and active components per channel.

What is the purpose of the BUF A and BUF B pins on the AD5303BRU-REEL?

The BUF A and BUF B pins on the AD5303BRU-REEL control whether the corresponding reference input (VREFA or VREFB) operates in buffered or unbuffered mode. When tied high, the internal reference buffer engages-offering >10 MΩ input impedance and enabling direct connection to high-impedance references. When tied low, the reference input becomes unbuffered (180 kΩ impedance), allowing wider input voltage range (0 V to VDD) but drawing more current from the reference source.