Overview
The AD7701AR, produced by Analog Devices Inc., is a 16-bit analog-to-digital converter (ADC) that utilizes a sigma-delta conversion technique. This device is renowned for its high resolution and accuracy, making it suitable for a variety of precision measurement applications. The AD7701AR features an on-chip digital filter with a six-pole Gaussian response, ensuring excellent linearity and endpoint accuracy through self-calibration of zero and full scale. The device can be powered by an external master clock or an on-chip crystal-controlled clock oscillator, and it offers a flexible serial interface compatible with UARTs and industry-standard microcontrollers.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 16 | Bits | |
| Integral Nonlinearity | ±0.0007% FSR (typ), ±0.0015% FSR (max) | % FSR | TMIN to TMAX |
| Differential Nonlinearity | ±0.125 LSB (typ), ±0.5 LSB (max) | LSB | TMIN to TMAX |
| Positive Full-Scale Error | ±0.13 LSB (typ), ±0.5 LSB (max) | LSB | |
| Power Supply Voltages | AVDD: 4.5/5.5 V, DVDD: 4.5/AVDD V, AVSS: –4.5/–5.5 V, DVSS: –4.5/–5.5 V | V | Min/Max |
| DC Power Supply Currents | AIDD: 2.7 mA (max), DIDD: 2 mA (max) | mA | Typically 2 mA and 1 mA respectively |
| Calibration Memory Retention Power Supply Voltage | 2.0 V | V | Min |
Key Features
- High Resolution and Accuracy: The AD7701AR offers 16-bit resolution with outstanding accuracy of ±0.0015% FSR, ensuring true, usable dynamic range without missing codes.
- Self-Calibration: On-chip self-calibration eliminates zero and gain errors, and can also include external circuits to remove system offsets and gain errors.
- Flexible Interface: The device features a flexible serial port with asynchronous mode compatible with UARTs and two synchronous modes suitable for interfacing to shift registers or microcontrollers.
- Low Power Consumption: CMOS construction ensures low power dissipation, with an ultralow power standby mode reducing idle power consumption to 10 µW.
- Temperature Stability: The effects of temperature drift are eliminated by on-chip self-calibration, ensuring stable performance across a wide temperature range.
Applications
- Loop-Powered Remote Sensing: Ideal for applications where power is limited, such as in remote sensing and monitoring systems.
- Battery-Powered Portable Instruments: Suitable for portable instruments where low power consumption is critical.
- Precision Measurement Systems: Used in various precision measurement applications requiring high accuracy and resolution.
- Industrial Automation: Employed in industrial automation systems for precise data acquisition and control.
Q & A
- What is the resolution of the AD7701AR?
The AD7701AR has a 16-bit resolution.
- What is the accuracy of the AD7701AR?
The accuracy is ±0.0015% FSR.
- Does the AD7701AR have self-calibration capabilities?
Yes, it has on-chip self-calibration to eliminate zero and gain errors.
- What types of interfaces does the AD7701AR support?
The device supports asynchronous and synchronous serial interfaces compatible with UARTs and microcontrollers.
- What is the power consumption of the AD7701AR in standby mode?
The power consumption in standby mode is 10 µW.
- What are the typical power supply voltages for the AD7701AR?
The typical power supply voltages are AVDD: 4.5/5.5 V, DVDD: 4.5/AVDD V, AVSS: –4.5/–5.5 V, DVSS: –4.5/–5.5 V.
- Is the AD7701AR suitable for high-temperature environments?
Yes, it operates from –40°C to +85°C.
- Can the AD7701AR be used in battery-powered devices?
Yes, it is suitable for battery-powered portable instruments due to its low power consumption.
- What is the typical DC power supply current for the AD7701AR?
The typical DC power supply current is 2 mA for AIDD and 1 mA for DIDD.
- Is the AD7701AR still in production?
No, the AD7701AR is obsolete and no longer manufactured. Available substitutes should be considered.
