AD7305YR

Overview

The AD7305YR is a quad, 8-bit digital-to-analog converter (DAC) from Analog Devices Inc., featuring a parallel interface. It operates from single +3 V to +5 V or ±5 V supplies, with a guaranteed range of 2.7 V to 5.5 V. The device includes four internal precision buffers that swing rail-to-rail, allowing the reference input range to include both supply rails for positive or negative full-scale output voltages. Key electrical parameters include an 8-bit resolution, 1 MS/s sampling rate, and a settling time of 1 µs to ±0.1% of full scale. Power consumption is less than 9 mW at 3 V, with a shutdown current of 40 µA.

Feature Summary

• Quad 8-bit DAC architecture with rail-to-rail buffered outputs
• Parallel data interface with standard address decode and WR control
• Internal power-on reset sets outputs to zero scale at turn-on
• Hardware shutdown feature via A0/SHDN pin (40 µA typical current)

Applications

• Automotive output span voltage control
• Instrumentation and digitally controlled calibration systems
• Pin-compatible replacement for AD7226 when VDD < 5.5 V

Procurement Notes

Verify the specific suffix 'YR' against the manufacturer's ordering guide to confirm package type and temperature range, as datasheets may list multiple variants. Confirm availability status, as older components may be discontinued or subject to long lead times. Ensure the parallel interface requirements match the host system's digital logic capabilities.

Selection Notes

Select the AD7305YR over the AD7304 if a parallel interface is preferred over the serial SPI interface. This component is suitable for applications requiring simultaneous updates of all four channels via the LDAC strobe. Consider the 20-lead TSSOP package dimensions for PCB layout constraints. Verify that the external reference voltage source can drive the required input capacitance and resistance.

Part Context

The AD7305 is part of the AD7304/AD7305 family of micropower DACs. While the AD7304 utilizes a serial interface, the AD7305 provides a parallel interface for faster data loading in compatible systems. Both devices share identical analog performance characteristics, including R-2R ladder architecture and rail-to-rail output capability.

Replacement Considerations

The AD7305 is explicitly documented as a pin-compatible replacement for the AD7226 when operating with VDD less than 5.5 V. When substituting, ensure the legacy system supports the parallel data format and that the power supply rails remain within the 2.7 V to 5.5 V specification.