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AD7845SQ
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Product Detailed Parameters
- Description：IC DAC 12BIT V-OUT 24CDIP
- Series：-
- Mfr：Analog Devices Inc.
- Package：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)：±1 (Max), ±1 (Max)
- Architecture：R-2R
- Operating Temperature：-55°C ~ 125°C
- Package / Case：24-CDIP (0.300", 7.62mm)
- Supplier Device Package：24-CDIP
- Mounting Type：Through Hole
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Overview
The AD7845SQ is a 12-bit CMOS multiplying digital-to-analog converter (MDAC) with an integrated output amplifier, fabricated on the LC2MOS process. It supports full 4-quadrant multiplication and features three on-chip application resistors for gain ranging and offset adjustment. The device accepts parallel TTL and 5 V CMOS compatible digital inputs controlled by CS and WR signals. It operates within an extended temperature range of -55°C to +125°C and is housed in a hermetic Q-24 Cerdip package.
Feature Summary
- Integrated output amplifier capable of supplying -10 V into a 2 kΩ load
- Three on-chip application resistors (RA, RB, RC) for gain ranging and offsetting
- Guaranteed monotonic operation across the full operating temperature range
- TTL and 5 V CMOS compatible digital inputs with standard latch control
Applications
- Automatic Test Equipment
- Digital Attenuators
- Programmable Power Supplies
- Programmable Gain Amplifiers
- Digital-to-4–20 mA Converters
Procurement Notes
Verify that the ordering suffix /883B confirms MIL-STD-883, Class B processing requirements are met. Confirm the Q-24 Cerdip package specification matches the design constraints. Ensure the extended temperature grade (-55°C to +125°C) aligns with system environmental specifications before procurement.
Selection Notes
Select this component when a 12-bit resolution with 4-quadrant multiplying capability and an integrated buffer is required. The SQ variant is appropriate for applications demanding extended temperature performance (-55°C to +125°C). Consider the on-chip application resistors if gain ranging or offset adjustments are needed without external components.
Part Context
The AD7845 is the industry’s first 4-quadrant multiplying D/A converter with an on-chip amplifier. The SQ/883B designation indicates it belongs to the S-grade temperature range and undergoes specific military/aerospace screening processes as defined by the /883B suffix.
Replacement Considerations
AD7845TQ/883B offers identical functionality with improved relative accuracy at +25°C (-1/2 LSB vs -1 LSB) while maintaining the same package and temperature range.
