AD7305BRU

Overview

The AD7305BRU is a quad, 8-bit digital-to-analog converter (DAC) from Analog Devices Inc. It features four independent channels with rail-to-rail buffered voltage outputs and operates on single supplies of +2.7 V to +5.5 V or dual supplies of ±5 V. The device utilizes a fast parallel interface with standard address decoding and a write control line for data loading. Key electrical specifications include an integral nonlinearity (INL) and differential nonlinearity (DNL) of ±1 LSB maximum, a settling time of 1 µs to ±0.1% full scale, and a reference multiplying bandwidth of 2.6 MHz. It consumes less than 9 mW at 3 V and includes an internal power-on reset.

Feature Summary

• Quad 8-bit DAC architecture with true rail-to-rail output swing capability
• Fast parallel input interface utilizing DB0-DB7, WR, A0, and A1 pins
• Internal precision buffers drive loads up to 2 kΩ in parallel with 500 pF
• Hardware shutdown mode reduces supply current to 40 µA when A0/SHDN pin is floated

Applications

• Automotive output span voltage generation
• Instrumentation and digitally controlled calibration systems
• Pin-compatible replacement for AD7226 when operating below 5.5 V

Procurement Notes

Verify the package type upon ordering; the BRU suffix indicates a 20-lead TSSOP surface-mount package. Confirm that the application design accommodates the parallel interface requirements, including address decoding logic for the A0 and A1 pins. Ensure the external reference voltage remains within the specified VSS to VDD range to maintain rail-to-rail performance.

Selection Notes

Select the AD7305BRU over the AD7304 variant when a parallel data interface is preferred over serial communication. This component is suitable for applications requiring simultaneous updates via the LDAC strobe. Verify that the system can provide the necessary address lines and write signals, as the device lacks the serial shift register complexity found in the AD7304.

Part Context

The AD7305 is part of the AD7304/AD7305 family of low-power, quad 8-bit DACs. While sharing identical analog performance and R-2R ladder architecture with the AD7304, it differs by employing a parallel data interface and a single common reference input, whereas the AD7304 uses a serial interface and four independent reference inputs.

Replacement Considerations

The datasheet identifies the AD7305 as a pin-compatible replacement for the industry-standard AD7226, provided the supply voltage is maintained below 5.5 V.