AD7303BR

Overview

The AD7303BR is a dual, 8-bit voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on a single +2.7 V to +5.5 V supply and features rail-to-rail output buffers with a typical settling time of 1.2 μs. The device utilizes a versatile 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards, supporting clock rates up to 30 MHz. It includes an internal reference or allows external reference input via the REF pin. The AD7303BR is housed in an 8-lead SOIC package and supports an operating temperature range of –40 °C to +105 °C.

Feature Summary

• Dual 8-bit DACs with rail-to-rail output buffering
• Single supply operation (+2.7 V to +5.5 V)
• 3-wire serial interface (SPI/QSPI/Microwire compatible)
• Internal or external reference capability

Applications

• Portable battery-powered instruments
• Digital gain and offset adjustment
• Programmable voltage and current sources
• Programmable attenuators

Procurement Notes

Verify the specific suffix 'BR' corresponds to the 8-lead SOIC package and the B version temperature range (-40 °C to +105 °C). Confirm that the ordering guide matches the required package option for the design. Check for any RoHS compliance details if required by the manufacturing process.

Selection Notes

Select the AD7303BR when dual 8-bit resolution with rail-to-rail output is required in a compact SOIC package. Ensure the application supports the 3-wire serial interface timing constraints. Consider the internal reference accuracy (±1% max) versus external reference needs. Verify power consumption requirements against the 2.3 mA max at 3.3 V specification.

Part Context

The AD7303 series includes variants such as the AD7303BN (Plastic DIP) and AD7303BRM (microSOIC). The AD7303BR specifically denotes the SOIC-8 package variant within the same functional family. All variants share identical electrical specifications and pinouts, differing only in physical packaging.

Replacement Considerations

Direct pin-compatible replacements include the AD7303BN and AD7303BRM. Ensure the substitute maintains the same package type (SOIC-8) and temperature grade (B Version: -40°C to +105°C) if form-fit-function replacement is required.

FAQ

What is the maximum serial clock frequency?

The serial clock frequency can be as high as 30 MHz.

How is the output voltage calculated?

The output voltage is given by VOUT = 2 × VREF × (N/256), where VREF is the reference voltage and N is the decimal equivalent of the input code (0-255).

What is the power consumption in full power-down mode?

In full power-down mode, the current consumption is typically 80 nA at +25°C and maximally 1 μA across the temperature range.