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AD7859AP
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Product Detailed Parameters
- Description：IC ADC 12BIT 8CH 200KSPS 44PLCC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bulk
- 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-LCC (J-Lead)
- Supplier Device Package：44-PLCC (16.59x16.59)
- Mounting Type：Surface Mount
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Overview
The AD7859AP is an 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC). It operates from a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS. The device features a flexible parallel interface supporting both 16-bit word and 8-bit byte transfers. Key specifications include a typical signal-to-noise ratio of 71 dB, integral nonlinearity of ±0.5 LSB, and differential nonlinearity of ±1 LSB. Power consumption is typically 15 mW at 3 V in normal mode, with options for automatic power-down after conversion.
Feature Summary
- Integrated self-calibration and system calibration mechanisms to maintain accuracy over time and temperature variations.
- Flexible parallel I/O port allowing configuration for either 16-bit word or 8-bit byte data transfer modes.
- Multiple power management options including automatic power-down after conversion to optimize energy efficiency.
- Pseudo-differential sampling scheme with input track-and-hold acquisition capability.
Applications
- Battery-powered systems such as personal digital assistants and mobile communications devices.
- Medical instruments requiring precise analog signal digitization.
- Instrumentation and control systems utilizing multi-channel data acquisition.
- Pen computers and high-speed modem applications.
Procurement Notes
Verify the specific ordering suffix to confirm package type and temperature range. The 'A' version denotes commercial temperature operation (-40°C to +85°C). Confirm availability status as older components may have limited production support. Ensure compatibility with existing board layouts for the 44-pin PLCC package if applicable.
Selection Notes
Select the AD7859AP when speed optimization is prioritized over the lower-power AD7859L variant. Choose this component for designs requiring 200 kSPS throughput with 8 multiplexed inputs. Consider the parallel interface requirements and available PCB space for the 44-pin plastic lead chip carrier package during the design phase.
Part Context
This component belongs to the AD7859 family of high-speed, low-power ADCs manufactured by Analog Devices. The family includes variants optimized for different performance trade-offs, such as the AD7859L for reduced power consumption. The AD7859AP specifically utilizes the PLCC package format within the broader product line.
Replacement Considerations
The AD7859AS serves as a direct pin-compatible alternative using the PQFP package. Designers should verify that the thermal characteristics and physical footprint differences between PLCC and PQFP packages are acceptable for the target application before substitution.
