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AD7948ARSZ-B
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Product Detailed Parameters
- Description：IC DAC 12BIT A-OUT 20SSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：12
- Number of D/A Converters：1
- Settling Time：5µs (Typ)
- Output Type：Current - Unbuffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：External
- Voltage - Supply, Analog：3V ~ 5.5V
- Voltage - Supply, Digital：3V ~ 5.5V
- INL/DNL (LSB)：±1 (Max), ±0.9 (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 AD7948ARSZ-B is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices Inc., featuring an 8-bit byte interface. It operates on a single +3.3 V to +5 V supply in Biased Mode, with guaranteed linearity of ±1 LSB INL and DNL. The device supports fast write pulsewidths of 40 ns at +5 V and 60 ns at +3.3 V. It offers low power consumption, typically 5 mW, and includes features such as data override logic and dual chip select inputs for MSB/LSB handling. The component is housed in a 20-lead SSOP package.
Feature Summary
- 12-bit resolution with ±1 LSB relative accuracy in Biased Mode
- 8-bit byte interface with CSMSB and CSLSB control
- Fast write pulsewidth: 40 ns min at +5 V, 60 ns min at +3.3 V
- Low glitch impulse: 60 nV-s typical
Applications
- Battery-powered instrumentation
- Laptop computer systems
- Upgrades for 754x series DAC designs
Procurement Notes
Verify the ordering suffix 'ARSZ' corresponds to the RS-20 SSOP package and industrial temperature range (-40°C to +85°C). Confirm that the '-B' designation indicates Biased Mode operation specifications. Ensure compatibility with single-supply voltage ranges of +3.3 V to +5 V before procurement.
Selection Notes
Select the AD7948 variant specifically when an 8-bit parallel interface is required rather than serial or full 12-bit parallel options. Choose the '-B' suffix version for single-supply applications requiring biased mode operation. Verify that the 40 ns write timing meets system clock requirements at the intended supply voltage.
Part Context
This component belongs to the AD7943/AD7945/AD7948 family of fast 12-bit multiplying DACs. While the AD7943 uses a serial interface and the AD7945 uses a 12-bit parallel interface, the AD7948 provides an 8-bit byte interface. All variants share similar core DAC architecture and performance characteristics but differ in digital input configuration.
Replacement Considerations
Public confirmed substitutes include AD7943 and AD7945 models within the same family, though interface differences apply. Legacy replacements for 5 V designs include the AD7543, AD7545, and AD7548 series.
