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AD7945BRS
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Product Detailed Parameters
- Description：IC DAC 12BIT A-OUT 20SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube,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-SSOP (0.209", 5.30mm Width)
- Supplier Device Package：20-SSOP
- Mounting Type：Surface Mount
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Overview
The AD7945BRS is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead Shrink Small Outline Package (SSOP). It features a parallel interface with 12-bit data inputs and operates on a single +5 V supply. Key electrical specifications include ±0.5 LSB maximum relative accuracy and differential nonlinearity, a typical power dissipation of 5 mW, and a fast settling time of 600 ns to 0.01% full-scale range. The device supports normal current mode operation and is designed for applications requiring low glitch impulse and high speed.
Feature Summary
- 12-bit resolution with ±0.5 LSB max INL and DNL
- Parallel digital interface with CS and WR control signals
- Fast settling time of 600 ns typ to 0.01% FSR
- Low power consumption: 5 mW typ at +5 V supply
Applications
- Battery-powered instrumentation
- Laptop computers
- Upgrades for all 754x series DACs (5 V designs)
Procurement Notes
Verify the package type corresponds to the RS suffix (SSOP-20) and confirm the temperature grade B (-40°C to +85°C). Ensure the design utilizes a single +5 V supply for Normal Mode operation as specified in the datasheet. Cross-reference pinouts for the SSOP variant against the DIP/SOP versions if board space is constrained.
Selection Notes
Select the AD7945BRS when a parallel interface is required instead of the serial AD7943 or byte-oriented AD7948. This model is suitable for systems needing a single-channel 12-bit output with high linearity. Consider the SSOP package only if surface-mount assembly is necessary; otherwise, the DIP or SOP variants may offer easier prototyping.
Part Context
The AD7945BRS belongs to the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. It serves as a direct replacement for the industry-standard AD7545, offering superior speed and lower power consumption. The 'B' indicates industrial temperature range performance, while 'RS' denotes the specific SSOP package configuration.
Replacement Considerations
Public confirmed substitute part numbers include AD7945BN (DIP-20) and AD7945BR (SOP-20), which share identical electrical characteristics but differ in package form factor.
