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AD7835ASZ
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Product Detailed Parameters
- Description：IC DAC 14BIT V-OUT 44MQFP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tray
- Number of Bits：14
- Number of D/A Converters：4
- Settling Time：10µs (Typ)
- Output Type：Voltage - Buffered
- Differential Output：No
- Data Interface：Parallel
- Reference Type：External
- Voltage - Supply, Analog：±11.4V ~ 15.75V
- Voltage - Supply, Digital：5V
- INL/DNL (LSB)：±2 (Max), ±0.9 (Max)
- Architecture：R-2R
- Operating Temperature：-40°C ~ 85°C
- Package / Case：44-QFP
- Supplier Device Package：44-MQFP (10x10)
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD7835ASZ is a quad 14-bit digital-to-analog converter (DAC) from Analog Devices, housed in a 44-lead MQFP package. It features parallel data loading with support for both 14-bit and double-byte (8-bit/6-bit) formats. The device provides four voltage outputs with a maximum span of 14 V and a range of ±8.192 V. Key specifications include a typical output settling time of 10 µs, differential nonlinearity of ±0.9 LSB, and relative accuracy of ±2 LSB. It operates with +5 V logic supply and ±15 V analog supplies.
Feature Summary
- Quad 14-bit LC2MOS DAC architecture with parallel input interface
- Supports 14-bit straight loading or double-byte (8-bit/6-bit) loading modes
- Voltage outputs ranging from ±8.192 V with a maximum span of 14 V
- Asynchronous CLR input for setting outputs to user-defined DSG potential
- Simultaneous or individual channel updates via LDAC control
Applications
- Process control systems
- Automatic test equipment
- General-purpose instrumentation
Procurement Notes
Verify the package type corresponds to the 44-lead MQFP format specified for the AD7835. Confirm that the design supports parallel data interfaces, as this variant differs from the serial-loading AD7834. Ensure power supply sequencing protects against VCC exceeding VDD by more than 0.3 V during startup.
Selection Notes
Select the AD7835ASZ when a parallel interface is required for multi-channel applications. The ASZ suffix indicates lead-free compliance. Verify that the system can provide separate ±15 V analog supplies and a +5 V logic supply. Consider the AD7834 if serial bus saving is preferred over parallel pin count.
Part Context
The AD7835 is part of the AD7834/AD7835 family of monolithic quad DACs. While the AD7834 utilizes a serial interface with dedicated address pins for daisy-chaining, the AD7835 uses a parallel interface with hardware address decoding (A0-A2). Both share similar accuracy specifications and LC2MOS technology but differ significantly in digital interfacing requirements.
Replacement Considerations
The AD7834 is a functional substitute only if the system interface is changed from parallel to serial. No direct pin-compatible parallel replacements are documented in the provided source material.
