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AD7948BRSZ
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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：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 AD7948BRSZ is a 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead SSOP package. It features an 8-bit byte interface with separate chip selects for most significant and least significant bytes. The device operates on a single +3.3 V to +5 V supply, consuming typically 5 mW. Key electrical specifications include ±0.5 LSB maximum integral and differential nonlinearity, a settling time of 600 ns to 0.01%, and a glitch impulse of 60 nV-s. It supports both normal mode (+5 V) and biased mode operation.
Feature Summary
- 12-bit resolution with ±0.5 LSB INL and DNL accuracy
- 8-bit parallel byte interface with CSMSB/CSLSB control
- Low power consumption: typically 5 mW at +5 V
- Fast settling time: 600 ns to 0.01% full scale
Applications
- Battery-powered instrumentation
- Laptop computer systems
- Upgrades for legacy 754x series DAC designs
Procurement Notes
Verify the specific ordering suffix 'BRSZ' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Ensure the design supports the required 8-bit byte interface timing constraints, specifically the 40 ns write pulsewidth minimum at +5 V supplies.
Selection Notes
Select this component when an 8-bit parallel interface is preferred over the 12-bit parallel (AD7945) or serial (AD7943) alternatives within the same family. It is suitable for applications requiring fast updating rates with moderate pin count. Verify that the system can accommodate the external reference input and output amplifier configuration required for current-mode operation.
Part Context
This part 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 full 12-bit parallel bus, the AD7948 utilizes an 8-bit byte interface. All three devices share similar accuracy, speed, and power characteristics, allowing for flexible interface selection based on system architecture.
Replacement Considerations
Publicly confirmed direct substitutes include the AD7945BRSZ (12-bit parallel interface) and AD7943BRS (serial interface). These parts are pin-compatible within the SSOP-20 package but require interface logic adjustments due to different data widths and control signals.
