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AD7865AS-3
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Product Detailed Parameters
- Description：IC ADC 14BIT 4CH 5V 44-MQFP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bag
- Number of Bits：14
- Sampling Rate (Per Second)：350k
- Number of Inputs：-
- Input Type：-
- Data Interface：Parallel
- Configuration：-
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- 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 AD7865AS-3 is a four-channel, simultaneous sampling, 14-bit analog-to-digital converter (ADC) operating from a single +5 V supply. It features four track/hold amplifiers and a successive approximation ADC with a conversion time of 2.4 µs per channel. The device supports input ranges of ±2.5 V and offers overvoltage protection up to ±18 V. Maximum throughput is 350 kSPS for a single channel and 100 kSPS for all four channels. It utilizes a high-speed parallel interface compatible with 3 V processors and includes an internal 2.5 V reference.
Feature Summary
- Four simultaneously sampled inputs preserve relative phase information across channels.
- Hardware or software selectable channel sequence allows conversion of any subset of the four channels.
- High-speed parallel interface facilitates direct connection to microprocessors and DSPs.
- Low power consumption with a dedicated standby mode for energy savings.
Applications
- AC Motor Control
- Uninterruptible Power Supplies
- Industrial Power Meters/Monitors
- Data Acquisition Systems
Procurement Notes
Verify the specific suffix 'AS' indicates the commercial temperature range (-40°C to +85°C) and plastic leaded quad flatpack package. Confirm the '-3' designation corresponds to the ±2.5 V bipolar input range. Ensure compatibility with system voltage levels and interface requirements before integration.
Selection Notes
Select this model when simultaneous sampling of four channels is required to maintain signal phase relationships. Choose the AD7865AS-3 specifically for applications requiring a ±2.5 V input range. Consider the AD7865BS-3 variant if tighter integral nonlinearity accuracy is necessary within the same temperature and package constraints.
Part Context
The AD7865 belongs to Analog Devices' family of fast, low-power, multi-channel ADCs. The AS-3 variant specifically targets industrial applications needing precise bipolar signal acquisition. It complements other models in the series that offer different input ranges like ±10 V or unipolar options, providing flexibility for various sensor interfaces.
Replacement Considerations
The AD7865BS-3 serves as a higher-accuracy alternative within the same package and temperature range. For unipolar applications, the AD7865AS-2 provides equivalent performance with a 0 V to 5 V input range. Cross-referencing pinouts and timing characteristics is essential when substituting these variants.
