AD7861AP

Overview

The AD7861AP is an 11-bit resolution simultaneous sampling analog-to-digital converter (ADC) designed for motor control and power measurement applications. It features four input channels sampled simultaneously, with seven single-ended analog inputs total. The device operates on a single +5 V supply and includes an internal 2.5 V reference. Key electrical parameters include a conversion time of 40 clock cycles per channel, a system clock range of 6.25 MHz to 12.5 MHz, and a nominal input level of 0–5 V. Relative accuracy is ±2 LSB max, with differential nonlinearity at ±2.5 LSB max. The package option is P-44A.

Feature Summary

• Four-channel simultaneous sample-and-hold amplifier preserves relative phase information for out-of-phase signals.
• User-definable channel sequencing allows acquisition of two, three, or four channels per group via M0/M1 mode select pins.
• Register-based input/output structure facilitates memory-mapped integration with digital signal processors and microcontrollers.

Applications

• Motor Control
• 3-Phase Power Measurement
• Cellular Phones

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm temperature range and package type. Ensure compatibility with existing board layouts regarding the P-44A plastic leadless chip carrier dimensions. Confirm that the internal reference tolerance meets system requirements without external calibration.

Selection Notes

Select this component when simultaneous sampling of multiple voltage inputs is required to maintain phase integrity. Verify that the 11-bit resolution and 0–5 V input range align with sensor output specifications. Consider the 6.25 MHz to 12.5 MHz clock requirement for timing constraints in the host processor interface.

Part Context

The AD7861 is part of Analog Devices' portfolio of data acquisition subsystems intended for industrial and consumer electronics. It is often paired with 16-bit fixed-point DSPs to create cost-effective microcontroller solutions for complex signal processing tasks in motor drives and power systems.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Evaluate other simultaneous sampling ADCs from Analog Devices or Texas Instruments based on pin compatibility and resolution requirements.