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AD7945BRZ
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Product Detailed Parameters
- Description：IC DAC 12BIT A-OUT 20SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：12
- Number of D/A Converters：1
- Settling Time：600µs (Typ)
- Output Type：Current - Unbuffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：External
- Voltage - Supply, Analog：5V
- Voltage - Supply, Digital：5V
- INL/DNL (LSB)：±0.5 (Max), ±0.5 (Max)
- Architecture：R-2R
- Operating Temperature：-40°C ~ 85°C
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Mounting Type：Surface Mount
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Overview
The AD7945BRZ is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring a parallel interface. It operates on a single +5 V supply in Normal Mode or +3.3 V to +5 V in Biased Mode. Key electrical specifications include ±0.5 LSB maximum relative accuracy, differential nonlinearity (DNL), and integral nonlinearity (INL). The device achieves a typical output voltage settling time of 600 ns to 0.01% and exhibits a low glitch impulse of 60 nV-s. Power consumption is typically 5 mW under standard operating conditions.
Feature Summary
- 12-bit resolution with ±0.5 LSB guaranteed linearity (INL/DNL)
- Fast parallel interface with 40 ns minimum write pulsewidth
- Low power operation: typically 5 mW at +5 V supply
- Low glitch impulse of 60 nV-s for high-fidelity signal generation
Applications
- Battery-powered instrumentation systems
- Laptop computer peripheral interfaces
- Direct upgrades for legacy 754x series DAC designs
Procurement Notes
Verify the specific package variant, as the BRZ suffix denotes the SOP-20 form factor. Confirm that the required temperature range aligns with the B Grade specification (-40°C to +85°C). Ensure the design supports the necessary parallel control signals (CS, WR) and current-mode output termination.
Selection Notes
Select the AD7945BRZ when a 12-bit parallel input interface is required rather than serial (AD7943) or byte-wide (AD7948). Choose this component for applications needing fast settling times and low power dissipation. Verify that the system can accommodate the current-output architecture and external feedback amplifier requirements.
Part Context
This component belongs to the AD7943/AD7945/AD7948 family of multiplying DACs. While functionally similar regarding core DAC performance, the AD7945 is distinct within the family due to its dedicated 12-bit parallel data bus, contrasting with the serial shift register of the AD7943 and the dual-byte structure of the AD7948.
Replacement Considerations
The datasheet identifies the AD7545 as a legacy industry-standard part that the AD7945 replaces. Designers upgrading from the AD7545 should note improvements in speed and power consumption while maintaining pin compatibility.
