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AD7845BR
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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 AD7845BR is a 12-bit CMOS multiplying digital-to-analog converter (MDAC) featuring an integrated output amplifier. Fabricated on the LC2MOS process, it supports full 4-quadrant multiplication with guaranteed monotonicity across its operating temperature range of –40°C to +85°C. The device utilizes parallel data inputs compatible with TTL and 5 V CMOS logic. Key electrical specifications include a maximum relative accuracy error of –1/2 LSB at +25°C and a settling time of 5 ms to 0.01% of full-scale range. It operates with dual power supplies ranging from ±14.25 V to ±15.75 V and includes on-chip application resistors for gain ranging and offset adjustment.
Feature Summary
- Integrated output amplifier providing voltage output capability with –10 V swing into a 2 kΩ load
- On-chip application resistors (RA, RB, RC) for simplified gain ranging and offset adjustment
- TTL and 5 V CMOS compatible digital inputs with standard CS and WR control signals
- Guaranteed monotonic performance over the full industrial temperature range
Applications
- Automatic Test Equipment
- Programmable Power Supplies
- Digital Attenuators
- Programmable Gain Amplifiers
- Digital-to-4–20 mA Converters
Procurement Notes
Verify the specific suffix 'BR' corresponds to the Industrial temperature grade (–40°C to +85°C) and SOIC-24 package option in the manufacturer's ordering guide. Confirm that the required accuracy specification matches the –1/2 LSB relative accuracy limit defined for this version. Ensure supply voltages remain within the ±14.25 V to ±15.75 V range to maintain specified performance parameters.
Selection Notes
Select the AD7845BR when a single-channel voltage-output MDAC with an internal amplifier is required for industrial environments. This model is suitable for applications needing precise gain ranging via internal resistors or those requiring guaranteed monotonicity without external trimming. Compare against the J/K versions if commercial temperature ranges are sufficient, or S/T versions for extended military/aerospace temperatures.
Part Context
The AD7845 series represents Analog Devices' first 4-quadrant multiplying DAC with an on-chip amplifier. The BR variant specifically denotes the industrial temperature grade housed in a 24-lead Small Outline Integrated Circuit (SOIC) package. It belongs to the broader AD7845 family which includes ceramic DIP and LCC options, differentiated primarily by temperature range and physical footprint.
Replacement Considerations
Direct pin-compatible replacements within the same family include the AD7845AR for identical functionality but with a wider –1 LSB accuracy specification. For extended temperature requirements, the AD7845SQ/883B or AD7845TQ/883B offer hermetic packaging and –55°C to +125°C operation.
