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Product Detailed Parameters
- Description：IC DAC 18BIT V-OUT 20TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：18
- Number of D/A Converters：1
- Settling Time：1µs (Typ)
- Output Type：Voltage - Unbuffered
- Differential Output：No
- Data Interface：SPI, DSP
- Reference Type：External
- Voltage - Supply, Analog：7.5V ~ 16.5V, -2.5V ~ 16.5V
- Voltage - Supply, Digital：2.7V ~ 5.5V
- INL/DNL (LSB)：±0.5, ±0.5
- Architecture：R-2R
- Operating Temperature：-40°C ~ 125°C
- Package / Case：20-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：20-TSSOP
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD5781BRUZ is a single-channel, true 18-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on bipolar supplies up to ±16.5 V and features a maximum integral nonlinearity (INL) of ±0.5 LSB and differential nonlinearity (DNL) of ±0.5 LSB, ensuring monotonic operation. The device supports a versatile 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, with clock rates up to 35 MHz. Key electrical parameters include a 1 µs settling time, 7.5 nV/√Hz noise spectral density, and an operating temperature range of −40°C to +125°C.
Feature Summary
- True 18-bit resolution with ±0.5 LSB INL and DNL guarantees monotonicity.
- Wide supply range supporting up to ±16.5 V for high-voltage applications.
- Low noise performance with 7.5 nV/√Hz spectral density and <0.05 ppm/°C temperature drift.
- Integrated power-on reset ensures the DAC output powers up to 0 V.
Applications
- Medical instrumentation
- Test and measurement equipment
- Industrial control systems
- Scientific and aerospace instrumentation
Procurement Notes
Verify the specific suffix 'BRUZ' corresponds to the B-version specifications in the datasheet, particularly regarding INL limits under different reference conditions. Confirm package availability in TSSOP-20 and ensure compatibility with the required analog and digital supply voltages during sourcing.
Selection Notes
Select this component when high accuracy and wide voltage swing are required. The B-version offers tighter linearity specs compared to the A-version. Ensure external buffering amplifiers like the AD8676 are used for reference inputs to maintain specified linearity. Check that the system can accommodate the ±16.5 V supply rails if utilizing the full dynamic range.
Part Context
The AD5781 belongs to a family of high-precision DACs including the 20-bit AD5791. It is designed for applications demanding high relative accuracy and low noise. The BRUZ variant specifies the industrial temperature grade (-40°C to +125°C) and the TSSOP-20 surface-mount package.
Replacement Considerations
The AD5791BRUZ is a 20-bit alternative within the same product family offering higher resolution. For lower resolution needs, the AD5541A or AD5542A provide 16-bit accuracy with 5 V operation. Verify pinout and software compatibility when substituting.
