Overview
The AD7718BR, produced by Analog Devices Inc., is a high-resolution analog-to-digital converter (ADC) designed for low-frequency measurement applications. This 24-bit Σ-Δ ADC features a programmable gain front end and can be configured as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels. It operates from a single 3 V or 5 V supply, making it versatile for various power requirements. The device is part of the AD7708/AD7718 family, which offers a pin-for-pin compatible upgrade path from 16-bit to 24-bit resolution without hardware modifications.
Key Specifications
| Parameter | Value | Unit | Test Conditions |
|---|---|---|---|
| Resolution | 24 Bits | - | - |
| Output Update Rate | 5.4 Hz min to 105 Hz max | Hz | CHOP = 0 |
| Input Range | ±20 mV to ±2.56 V | V | - |
| Integral Nonlinearity | ±10 ppm of FSR max | ppm | - |
| Offset Error | ±3 µV typ | µV | - |
| Offset Error Drift vs. Temp | 10 nV/°C typ | nV/°C | - |
| Supply Voltage | 2.7 V to 3.6 V or 4.75 V to 5.25 V | V | - |
| Package | 28-lead SOIC | - | - |
| Operating Temperature | –40°C to +85°C | °C | - |
Key Features
- 24-bit Σ-Δ ADC with programmable gain front end
- Configurable as 4/5 fully-differential or 8/10 pseudo-differential input channels
- Simultaneous 50 Hz and 60 Hz rejection
- Factory-calibrated single conversion cycle setting
- Operates from a single 3 V or 5 V supply
- Low power consumption (3.84 mW typ at 3 V supply)
- Pin-for-pin compatible with AD7708 for easy upgrade from 16-bit to 24-bit resolution
- On-board PLL generating internal operating frequency from a 32 kHz crystal
- Software programmable output data rate
Applications
- Low-frequency measurement applications
- Industrial process control
- Medical devices requiring high precision and low noise
- Automotive sensors and monitoring systems
- Environmental monitoring and data acquisition systems
Q & A
- What is the resolution of the AD7718BR ADC?
The AD7718BR has a 24-bit resolution.
- What are the configurable input channel options for the AD7718BR?
The AD7718BR can be configured as 4/5 fully-differential or 8/10 pseudo-differential input channels.
- What is the operating voltage range for the AD7718BR?
The AD7718BR operates from a single 2.7 V to 3.6 V or 4.75 V to 5.25 V supply.
- What is the typical power consumption of the AD7718BR at 3 V supply?
The typical power consumption is 3.84 mW at a 3 V supply.
- Does the AD7718BR have simultaneous 50 Hz and 60 Hz rejection capability?
- What type of package is the AD7718BR available in?
The AD7718BR is available in a 28-lead SOIC package.
- What is the operating temperature range for the AD7718BR?
The operating temperature range is –40°C to +85°C.
- Is the AD7718BR pin-for-pin compatible with other models?
- How is the output data rate of the AD7718BR controlled?
The output data rate of the AD7718BR is software programmable.
- What is the purpose of the on-board PLL in the AD7718BR?
The on-board PLL generates the internal operating frequency from a 32 kHz crystal.
