AD7304YR

Overview

The AD7304YR is a quad, 8-bit digital-to-analog converter (DAC) from Analog Devices Inc., designed for operation with single +3 V to +5 V or ±5 V power supplies. It features four independent voltage-output channels with rail-to-rail buffered outputs and individual reference inputs. The device utilizes an SPI-compatible 3-wire serial interface (SDI, CLK, CS) for data input. Key electrical specifications include a maximum settling time of 1 µs, integral nonlinearity (INL) and differential nonlinearity (DNL) of ±1 LSB, and a reference multiplying bandwidth of 2.6 MHz. Power consumption is less than 9 mW at 3 V, with a 40 µA shutdown current.

Feature Summary

• Quad 8-bit DAC architecture with internal precision buffers providing true rail-to-rail output swing.
• SPI-compatible 3-wire serial interface supporting high-speed data transfer.
• Independent reference inputs (VREFA–VREFD) allowing per-channel full-scale voltage configuration.
• Internal power-on reset ensures zero-scale output state upon initialization.
• Hardware shutdown capability via the SDI/SHDN pin, reducing supply current to 40 µA.

Applications

• Automotive output span voltage adjustment
• Instrumentation systems requiring digitally controlled calibration
• Pin-compatible replacement for AD7226 in designs operating below 5.5 V

Procurement Notes

Verify the specific suffix 'YR' against the manufacturer's official ordering guide to confirm package type and temperature range, as standard listings often specify 'BRUZ' (TSSOP-16, -40°C to +85°C). Confirm RoHS compliance status directly with the supplier documentation. Ensure the serial interface requirements match the host microcontroller's SPI mode before procurement.

Selection Notes

Select this component when a low-power, quad-channel DAC with independent reference control is required. The AD7304 is suitable for applications needing rail-to-rail output swing on both positive and negative supplies. Compare against the AD7305 if a parallel interface is preferred instead of serial. Ensure the system logic levels are compatible with the specified VIL and VIH thresholds for reliable communication.

Part Context

The AD7304 belongs to the AD7304/AD7305 family of 8-bit DACs. It differs from the AD7305 primarily by its serial interface and four independent reference inputs, whereas the AD7305 uses a parallel interface and a single common reference. Both share identical analog performance characteristics and pinouts for their respective packages.

Replacement Considerations

The AD7304 serves as a pin-compatible replacement for the AD7226 when the supply voltage is less than 5.5 V. When substituting, verify that the target application does not require the parallel interface of the AD7226, as the AD7304 requires a serial protocol change.