Overview
The AD7701BN, produced by Analog Devices Inc., is a 16-bit sigma-delta analog-to-digital converter (ADC) known for its high accuracy and low power consumption. This device utilizes a sigma-delta conversion technique, where the analog input is continuously sampled by an analog modulator, and the modulator output is processed by an on-chip digital filter. The AD7701BN offers excellent linearity and endpoint accuracy, ensured by self-calibration of zero and full scale, which can be initiated at any time. This ADC is suitable for a variety of applications requiring precise analog-to-digital conversion.
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/V max |
| DC Power Supply Currents | AIDD: 2.7 mA (max), DIDD: 2 mA (max) | mA | Typically 2 mA (AIDD), 1 mA (DIDD) |
| Operating Temperature Range | –40°C to +85°C | °C |
Key Features
- High Resolution and Accuracy: The AD7701BN offers 16-bit resolution with outstanding 0.0015% accuracy and no missing codes, ensuring a true 16-bit dynamic range.
- Self-Calibration: On-chip self-calibration eliminates zero and gain errors, and can also be extended to null system offset and gain errors in the input channel.
- Flexible Interface: The device features a flexible synchronous/asynchronous interface compatible with UARTs and the serial ports of industry-standard 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.
Applications
- Remote Sensing: Ideal for loop-powered remote sensing applications due to its low power consumption.
- Portable Instruments: Suitable for battery-powered portable instruments.
- Industrial Automation: Used in various industrial automation applications requiring precise analog-to-digital conversion.
- Medical Devices: Applicable in medical devices where high accuracy and low power are critical.
Q & A
- What is the resolution of the AD7701BN?
The AD7701BN has a 16-bit resolution.
- What is the accuracy of the AD7701BN?
The AD7701BN offers an accuracy of ±0.0015% FSR.
- Does the AD7701BN have any missing codes?
No, the AD7701BN ensures no missing codes, providing a true 16-bit dynamic range.
- How does the AD7701BN handle temperature drift?
The AD7701BN eliminates the effects of temperature drift through on-chip self-calibration.
- What types of interfaces does the AD7701BN support?
The AD7701BN supports both synchronous and asynchronous interfaces, compatible with UARTs and industry-standard microcontrollers.
- What is the power consumption of the AD7701BN in standby mode?
The power consumption in standby mode is reduced to 10 µW.
- What is the operating temperature range of the AD7701BN?
The operating temperature range is –40°C to +85°C.
- Can the AD7701BN be used in battery-powered devices?
Yes, the AD7701BN is suitable for battery-powered portable instruments due to its low power consumption.
- How is the output data accessed from the AD7701BN?
The output data is accessed through a flexible serial port.
- Is the AD7701BN still in production?
No, the AD7701BN is listed as obsolete by some suppliers.
