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AD7859BS
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Product Detailed Parameters
- Description：IC ADC 12BIT 8CH LP 44-MQFP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bag
- Number of Bits：12
- Sampling Rate (Per Second)：200k
- Number of Inputs：-
- Input Type：-
- Data Interface：Parallel
- Configuration：-
- Ratio - S/H:ADC：-
- Number of A/D Converters：2
- Architecture：-
- Reference Type：-
- Voltage - Supply, Analog：-
- Voltage - Supply, Digital：-
- Features：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：44-QFP
- Supplier Device Package：44-MQFP (10x10)
- Mounting Type：Surface Mount
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Overview
The AD7859BS is an 8-channel, 12-bit Analog-to-Digital Converter (ADC) from Analog Devices Inc., housed in a 44-pin PQFP package. It operates on a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS with a master clock of 4 MHz. The device features a track-and-hold amplifier with a 500 ns acquisition time and offers flexible parallel I/O interfaces supporting both 16-bit word and 8-bit byte transfers. Power consumption is typically 15 mW at 3 V in normal operation, with advanced power-down modes reducing dissipation to approximately 1.3 mW at 10 kSPS.
Feature Summary
- Integrated self-calibration and system calibration capabilities ensure long-term accuracy across temperature variations.
- Flexible parallel interface allows data transfer in either 16-bit words or two 8-bit bytes via the W/B pin configuration.
- Multiple power management options enable significant energy savings through automatic power-down after conversion.
Applications
- Battery-powered systems such as personal digital assistants and mobile communications devices
- Medical instruments requiring precise analog signal acquisition
- Instrumentation and control systems utilizing multi-channel data acquisition
Procurement Notes
Verify the specific suffix 'BS' against official documentation to confirm it denotes the standard speed variant with ±1/2 LSB linearity error in the S-44 package. Ensure compatibility with existing PCB footprints for the 44-pin PQFP form factor. Confirm that the required operating voltage range aligns with the specified 3 V to 5.5 V limits for reliable performance.
Selection Notes
Select the AD7859BS when high-speed sampling up to 200 kSPS is required alongside low power consumption. Choose this model over the AD7859L if faster conversion times are necessary, noting the higher power draw. Consider the integrated reference and calibration features if external precision components are to be minimized in the design.
Part Context
This component belongs to the AD7859 family of 12-bit sampling ADCs designed for low-power, multi-channel applications. The BS designation specifically identifies the standard speed version packaged in a plastic quad flatpack. It shares architectural similarities with other members of the series but differs in speed optimization and linearity specifications compared to the low-power L variant.
Replacement Considerations
Direct substitutes within the same family include the AD7859AP (PLCC package) and AD7859AS (standard PQFP). For lower power requirements, the AD7859LAS is available but operates at a reduced 100 kSPS rate. Verify pinout compatibility when switching between PQFP and PLCC packages.
