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AD7845KR
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Product Detailed Parameters
- Description：IC DAC 12BIT V-OUT 24SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube,Tube
- Number of Bits：12
- Number of D/A Converters：1
- Settling Time：5µs
- Output Type：Voltage - Buffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：External
- Voltage - Supply, Analog：±14.25V ~ 15.75V
- Voltage - Supply, Digital：-
- INL/DNL (LSB)：±0.75 (Max), ±1 (Max)
- Architecture：R-2R
- Operating Temperature：0°C ~ 70°C
- Package / Case：24-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：24-SOIC
- Mounting Type：Surface Mount
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Overview
The AD7845KR is a 12-bit CMOS multiplying digital-to-analog converter (MDAC) with an integrated output amplifier, manufactured by Analog Devices. It operates within a commercial temperature range of 0°C to +70°C and features a 24-lead SOIC package. The device supports ±15 V power supplies and utilizes a parallel interface controlled by CS and WR signals. Key electrical specifications include a settling time of 5 µs to 0.01% full-scale range, a typical glitch impulse of 5 nV-s, and a unity gain small signal bandwidth of 600 kHz. Relative accuracy at +25°C is specified as -1/2 LSB maximum.
Feature Summary
- Integrated on-chip output amplifier providing full 4-quadrant multiplying capability
- Three internal application resistors (RA, RB, RC) for gain ranging and offset adjustment
- TTL and 5 V CMOS compatible digital inputs with latched data architecture
- Laser-trimmed input offset voltage and guaranteed monotonicity over the operating temperature range
Applications
- Automatic Test Equipment
- Programmable Gain Amplifiers
- Digital Attenuators
- Programmable Power Supplies
- Digital-to-4–20 mA Converters
Procurement Notes
Verify the specific suffix KR corresponds to the 24-lead SOIC package and commercial temperature grade (0°C to +70°C). Confirm that the ordering code matches the required relative accuracy specification of -1/2 LSB maximum at +25°C. Ensure compatibility with standard TTL logic levels for microprocessor interfacing.
Selection Notes
Select the AD7845KR when a compact surface-mount solution is required for 12-bit multiplying DAC applications. The SOIC package offers space savings compared to DIP options while maintaining the same electrical performance. Consider the internal application resistors if gain ranging or offset nulling is needed without external components.
Part Context
The AD7845KR belongs to the AD7845 family of complete 12-bit multiplying DACs fabricated on the LC2MOS process. This technology allows precision linear components and digital circuitry to be implemented on a single chip. The KR variant specifically denotes the plastic SOIC package option within the broader product line that includes DIP, PLCC, and LCC packages.
Replacement Considerations
Direct pin-compatible replacements within the same package and temperature grade are limited in public documentation. Other variants such as AD7845KN (DIP) or AD7845AR (Industrial Temp) share functional similarities but differ in package type or operating temperature range.
