AD7701BNZ

Analog To Digital Converters (ADC) Overview

The AD7701BNZ is a monolithic 16-bit sigma-delta analog-to-digital converter featuring a six-pole Gaussian digital low-pass filter. It operates with supply voltages of +5 V and -5 V, supporting unipolar (0 to +2.5 V) or bipolar (±2.5 V) input ranges. The device achieves a maximum output data rate of 4 kSPS with an integral nonlinearity error of ±0.0015% FSR. Power consumption is typically 25 mW during normal operation and reduces to 10 µW in standby mode.

Analog To Digital Converters (ADC) Feature Summary

• On-chip self-calibration circuitry eliminates zero and gain errors
• Six-pole Gaussian digital filter provides high noise rejection
• Flexible serial interface supports synchronous and asynchronous modes
• Ultralow power standby mode for battery-powered applications

Analog To Digital Converters (ADC) Applications

• Industrial process control systems
• Weigh scales and force measurement
• Portable instrumentation devices
• Remote data acquisition networks

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix BNZ corresponds to the PDIP-20 package and commercial temperature range (-40°C to +85°C). Confirm that external voltage references are required as the device does not contain an internal reference. Ensure proper ESD precautions are taken during handling due to CMOS construction sensitivity.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high resolution and excellent linearity without missing codes. The integrated digital filter simplifies design by removing the need for external anti-aliasing filters. Consider the external clock requirement and the need for dual positive and negative power supplies when designing the system architecture.

Analog To Digital Converters (ADC) Part Context

The AD7701 belongs to Analog Devices' family of precision sigma-delta ADCs designed for low-frequency signal conditioning. It integrates a charge-balancing modulator with a microcontroller-based calibration system. The BNZ suffix indicates a plastic dual in-line package suitable for through-hole mounting in industrial environments.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitutes include other parts within the AD7701 series such as the AD7701BRZ for surface mount applications. Verify pin compatibility and electrical specifications before substitution.

Analog To Digital Converters (ADC) FAQ

How is the sampling rate determined?

The sampling rate is derived from the master clock input frequency divided by 256.

What is the purpose of the SC1 and SC2 pins?

These pins determine the type of calibration performed when the CAL pin is activated, allowing for system offset and gain error correction.

Can the AD7701 operate without an external crystal?

Yes, it can use an external clock source on the CLKIN pin, but if using the internal oscillator, a crystal must be connected between CLKOUT and CLKIN.