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Product Detailed Parameters
- Description：IC DAC 17BIT A-OUT 16SOIC
- Series：LOGDAC®
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：17
- Number of D/A Converters：1
- Settling Time：-
- Output Type：Current - Unbuffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：-
- Voltage - Supply, Analog：5V
- Voltage - Supply, Digital：5V
- INL/DNL (LSB)：-
- Architecture：R-2R
- Operating Temperature：-40°C ~ 85°C
- Package / Case：16-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：16-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD7111ACR is a monolithic logarithmic multiplying D/A converter fabricated in LC2MOS technology. It attenuates an analog input signal over a range of 0 dB to 88.5 dB with a nominal resolution of 0.375 dB. The device utilizes an onboard 8-bit buffer and decode logic to generate a 17-bit word for a 17-bit R-2R ladder. It operates on a single +5 V supply, features on-chip data latches, and accepts standard parallel digital inputs. The component is housed in a 16-pin SOIC package.
Feature Summary
- Dynamic Range: 88.5 dB attenuation capability
- Resolution: 0.375 dB step size
- Architecture: 17-bit R-2R ladder driven by decoded 8-bit input
- Interface: Parallel 8-bit data port with CS and WR control signals
Applications
- Audio Attenuators
- Sonar Systems
- Function Generators
- Digitally Controlled AGC Systems
Procurement Notes
Verify the specific grade (AC) against the required temperature range (-40°C to +85°C) and accuracy specifications (0 dB to 72 dB guaranteed range). Confirm the SOIC package option matches the design footprint. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS structure.
Selection Notes
Select the AD7111ACR when a wide dynamic range with fine step resolution is required in a compact surface-mount package. Compare performance against the AD7111A pin-compatible alternative if transparent latch operation via level-triggered WR is needed instead of edge-triggered loading. Consider output amplifier selection carefully to manage phase lag and offset errors.
Part Context
The AD7111/AD7111A series represents Analog Devices' LOGDAC family of logarithmic converters. These devices combine precision bipolar circuits with low-power CMOS logic. The AC grade specifically denotes industrial temperature performance within this product line, offering enhanced accuracy ranges compared to commercial grades.
Replacement Considerations
The AD7111A is pin and function compatible with the industry-standard AD7524, allowing for upgrades from existing designs. Other AD7111 variants such as AD7111ABR or AD7111KNZ may serve as alternatives depending on package preference or temperature requirements.
FAQ
How does the AD7111ACR handle digital-to-analog glitches?
The device is designed to minimize glitches resulting from digital feedthrough through its proprietary LC2MOS process. Typical glitch impulse is specified at 10 nV-sec.
What is the refresh time requirement for the AD7111ACR?
A minimum refresh time (tRFSH) of 3 µs is required for data to propagate through the decoder before a new data write can be attempted.
How is monotonicity defined for this component?
The device is monotonic if the analog output decreases or remains constant as the digital code increases. Monotonicity ranges depend on the selected attenuation step size and temperature grade.
