AD7801BR

Overview

The AD7801BR is a single-channel, 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 an on-chip precision output buffer capable of rail-to-rail swing. The device utilizes a parallel microprocessor-compatible interface with double-buffered logic for synchronous or automatic updates. Key electrical parameters include a maximum settling time of 2 µs, ±1 LSB relative accuracy, and ±1 LSB differential nonlinearity. Power consumption is typically 5 mW at 3.3 V, reducing to less than 1 µA in power-down mode. It is available in 20-lead SOIC and TSSOP packages.

Feature Summary

• Single 8-bit resolution with ±1 LSB max relative accuracy and guaranteed monotonicity.
• On-chip output buffer provides rail-to-rail voltage swing with 2 µs max settling time.
• Flexible reference selection between internal VDD/2 source and external REFIN pin (1 V to VDD/2).
• Low power operation: <1 µA current draw in power-down mode.

Applications

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

Procurement Notes

Verify the specific package suffix when ordering: 'R' denotes the 20-lead Small Outline (SOIC) package, while 'RU' denotes the 20-lead Thin Shrink Small Outline (TSSOP) package. Ensure the temperature range matches the B version specification (-40°C to +105°C). Confirm supply voltage requirements align with the +2.7 V to +5.5 V operational limits.

Selection Notes

Select the AD7801BR for applications requiring low-power, single-supply DAC performance with high-speed parallel interfacing. Choose the internal reference configuration by tying REFIN to VDD for simplified designs, or use an external reference for higher precision if the input voltage falls within the 1 V to VDD/2 range. Ensure the load capacitance does not exceed 100 pF to maintain specified settling times.

Part Context

The AD7801BR belongs to the AD7801 family of 8-bit voltage-output DACs. It is designed for systems needing precise analog control with minimal power consumption. The 'B' suffix indicates the commercial temperature grade (-40°C to +105°C). It serves as a cost-effective solution for embedded control loops and signal generation in portable electronics.

Replacement Considerations

Direct pin-for-pin replacements within the same package type should be verified against updated datasheets for timing and electrical parameter compatibility. No specific substitute part numbers are confirmed in the provided documentation.