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AD7845AR
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Product Detailed Parameters
- Description：IC DAC 12BIT MULT LC2MOS 24-SOIC
- Series：-
- 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：24-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：24-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD7845AR is a complete 12-bit multiplying digital-to-analog converter (DAC) fabricated on LC2MOS technology. It integrates an output amplifier and three application resistors for gain ranging and offset adjustment. The device supports full 4-quadrant multiplication with TTL and 5 V CMOS compatible digital inputs. Key electrical specifications include a maximum relative accuracy of -1 LSB at +25°C, a settling time of 5 µs to 0.01% FSR, and a unity gain small signal bandwidth of 600 kHz. It operates within a supply voltage range of ±14.25 V to ±15.75 V and functions across an industrial temperature range of –40 °C to +85 °C.
Feature Summary
- First industry DAC with integrated output amplifier and full 4-quadrant multiplying capability
- On-chip application resistors (RA, RB, RC) facilitate gain ranging and voltage offsetting
- TTL and 5 V CMOS compatible digital inputs simplify microprocessor interfacing
- Guaranteed monotonic operation over the entire operating temperature range
Applications
- Automatic Test Equipment
- Digital Attenuators
- Programmable Power Supplies
- Programmable Gain Amplifiers
- Digital-to-4–20 mA Converters
Procurement Notes
Verify the specific suffix 'AR' corresponds to the Industrial temperature grade (-40 °C to +85 °C) and SOIC package option when sourcing. Confirm that the component meets the required absolute maximum ratings, particularly regarding power dissipation limits and ESD sensitivity precautions during handling.
Selection Notes
Select the AD7845AR for applications requiring high-speed settling and precise multiplying functionality in a space-saving surface-mount package. Ensure the system design accommodates the specified ±15 V nominal supply rails and utilizes the internal application resistors if gain scaling or offset adjustments are necessary for the target analog output range.
Part Context
The AD7845AR belongs to the AD7845 family of 12-bit CMOS multiplying DACs. This series distinguishes itself by combining the DAC core with a laser-trimmed output amplifier on a single chip. The 'AR' designation specifically identifies the industrial temperature variant housed in a 24-lead SOIC package, differentiating it from commercial DIP or military hermetic versions.
Replacement Considerations
Direct replacements within the same family include the AD7845BR for improved accuracy or other package variants like the AD7845JPZ. Verify pin compatibility and thermal performance when substituting packages.
