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AD7948BNZ
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Product Detailed Parameters
- Description：IC DAC 12BIT A-OUT 20DIP
- 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-DIP (0.300", 7.62mm)
- Supplier Device Package：20-PDIP
- Mounting Type：Through Hole
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Overview
The AD7948BNZ is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, featuring an 8-bit byte interface. It operates on a single +5 V supply with guaranteed specifications for industrial temperature ranges (-40°C to +85°C). The device provides current output with a typical settling time of 600 ns to 0.01% and low glitch impulse of 60 nV-s. Key accuracy metrics include ±0.5 LSB maximum relative accuracy, differential nonlinearity (DNL), and integral nonlinearity (INL). It serves as a direct replacement for legacy industry-standard DACs while offering superior speed and lower power consumption.
Feature Summary
- 12-bit resolution with ±0.5 LSB max INL and DNL
- 8-bit parallel byte interface with 40 ns write pulsewidth
- Fast settling time of 600 ns to 0.01% full-scale
- Low power consumption: 5 mW typical at +5 V
Applications
- Battery-powered instrumentation
- Laptop computers
- Upgrades for all 754x series DACs in 5 V designs
Procurement Notes
Verify the package option 'N' corresponds to the Plastic DIP configuration when sourcing the AD7948BNZ. Confirm that the B Grade specification aligns with the required -40°C to +85°C operating range. Ensure the design supports the +5 V nominal supply voltage specified for this variant.
Selection Notes
Select the AD7948BNZ when an 8-bit byte interface is preferred over serial or full parallel options within the AD794x family. This model is suitable for applications requiring fast data throughput via byte-wide transfers. Compare against the AD7943 (serial) and AD7945 (parallel) if interface compatibility dictates a different control scheme.
Part Context
The AD7948BNZ 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 utilizes an 8-bit byte interface. All three share similar performance characteristics, including low power and high speed, but differ in data input architecture.
Replacement Considerations
The datasheet identifies the AD7948 as a superior replacement for the industry-standard AD7548. Designers upgrading from the AD7548 should verify pinout compatibility and ensure that the improved speed and lower power specifications are compatible with the existing system constraints.
