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AD7801BRZ-REEL
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Product Detailed Parameters
- Description：IC DAC 8BIT V-OUT 20SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Number of Bits：8
- Number of D/A Converters：1
- Settling Time：2µs
- Output Type：Voltage - Buffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：External
- Voltage - Supply, Analog：2.7V ~ 5.5V
- Voltage - Supply, Digital：2.7V ~ 5.5V
- INL/DNL (LSB)：±1 (Max), ±1 (Max)
- Architecture：Current Source
- Operating Temperature：-40°C ~ 105°C
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD7801BRZ-REEL is a single-channel, 8-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It operates from 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 and DSP-compatible interface with double-buffered logic for synchronous updates. Key electrical specifications 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 packaged in a 20-lead SOIC.
Feature Summary
- Single 8-bit resolution with rail-to-rail voltage output capability
- Parallel interface compatible with standard microprocessors and DSPs
- Internal or external reference selection via REFIN pin
- Low power operation: <1 µA current draw in power-down mode
Applications
- Portable battery-powered instruments
- Programmable voltage and current sources
- Digital gain and offset adjustment circuits
- Programmable attenuators
Procurement Notes
Verify the 'REEL' suffix indicates tape-and-reel packaging rather than tube packaging when sourcing. Confirm the 'B' suffix corresponds to the -40°C to +105°C industrial temperature range. Check manufacturer documentation for current production status as older variants may be obsolete.
Selection Notes
Select this component for applications requiring low-cost, single-supply 8-bit conversion with high-speed parallel interfacing. Ensure the load impedance matches the buffer's drive capability (10 kΩ to VDD/GND). For bipolar output requirements, external circuitry such as op-amps is necessary as the device is unipolar by default.
Part Context
The AD7801BRZ-REEL belongs to the AD7801 family of 8-bit DACs. The 'BR' designation specifies the 20-lead Small Outline Integrated Circuit (SOIC) package with industrial temperature rating. The 'Z' suffix typically denotes lead-free compliance, while '-REEL' specifies the reel packaging format for automated assembly.
Replacement Considerations
Direct functional substitutes within the same family include the AD7801BR (tube package) and AD7801BRU (TSSOP package). Verify pin compatibility and thermal characteristics when transitioning between SOIC and TSSOP footprints.
FAQ
How is the internal reference selected?
The internal reference (VDD/2) is selected by connecting the REFIN pin directly to the VDD supply.
What is the function of the CLR pin?
The CLR pin is an asynchronous clear input. When driven low, it loads all zeros into the DAC register, forcing the output to zero volts.
Can the AD7801 operate in bipolar mode natively?
No, the AD7801 is designed for unipolar operation (0 V to VDD). Bipolar operation requires external circuitry, such as an operational amplifier configuration.
