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Product Detailed Parameters
- Description：IC DAC DUAL LOGARITHMIC 20-SOIC
- Series：LOGDAC®
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：-
- Number of D/A Converters：-
- Settling Time：-
- Output Type：-
- Differential Output：-
- Data Interface：-
- Reference Type：-
- Voltage - Supply, Analog：-
- Voltage - Supply, Digital：-
- INL/DNL (LSB)：-
- Architecture：-
- Operating Temperature：-
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD7112BR is a dual logarithmic multiplying digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead SOIC package. It provides a dynamic range of 88.5 dB with a resolution of 0.375 dB per step. The device operates on a single +5 V supply and features two independent DAC channels (A and B), each capable of attenuating an analog input signal over the specified range. Key electrical parameters include a maximum gain error of ±0.15 dB, output leakage current of 400 nA max, and a typical DC supply rejection of 0.005 dB/%. The component supports four-quadrant multiplication and includes internal data latches for both DACs.
Feature Summary
- Dual 17-bit R-2R CMOS multiplying D/A converters with extensive digital logic
- Wide dynamic range of 88.5 dB with 0.375 dB resolution steps
- Four-quadrant multiplication capability for variable gain or attenuation control
- On-chip data latches for both DAC A and DAC B
Applications
- Audio attenuators and volume control systems
- Sonar systems requiring precise signal attenuation
- Automatic Gain Control (AGC) loops
- Programmable state variable filters
Procurement Notes
Verify the specific suffix 'BR' corresponds to the 20-lead SOIC package and the B-grade accuracy specifications (-40°C to +85°C). Confirm that the required attenuation accuracy ranges align with the B-version guarantees provided in the datasheet specifications table.
Selection Notes
Select the AD7112BR when a dual-channel logarithmic response is required for audio or sonar applications. Ensure the external operational amplifier selected has low input bias current (<10 nA) and low offset voltage (<50 µV) to minimize DC errors at the output. Consider phase compensation capacitors if using high-speed amplifiers to maintain stability.
Part Context
The AD7112 belongs to the LOGDAC family of products, designed specifically for applications requiring wide dynamic range and excellent channel matching. The 'B' grade indicates specific accuracy limits compared to the 'C' grade, particularly regarding monotonicity and gain error ranges. The 'R' suffix denotes the surface-mount SOIC package option.
Replacement Considerations
The AD7112CN is a pin-compatible alternative offering a wider accuracy range (0 dB to 72 dB) but housed in a Plastic DIP package. For surface-mount requirements, the AD7112CR provides the same package type as the BR variant but with C-grade performance specifications.
