Overview
The AD7718BRU, produced by Analog Devices Inc., is a high-resolution, low-power analog-to-digital converter (ADC) designed for low-frequency measurement applications. This component is part of the AD7718 series, which includes a 24-bit Σ-Δ ADC with a programmable gain amplifier (PGA). It is available in a 28-lead TSSOP package and is suitable for a wide range of applications requiring high accuracy and low noise.
Key Specifications
| Parameter | Unit | Test Conditions | Value |
|---|---|---|---|
| Resolution | Bits | - | 24 |
| Output Update Rate | Hz | CHOP = 0 | 5.4 Hz min, 105 Hz max |
| Input Range | V | - | ±20 mV to ±2.56 V |
| Integral Nonlinearity | ppm of FSR | - | ±10 ppm max |
| Offset Error | µV | - | ±3 µV typ |
| Offset Error Drift vs. Temp | nV/°C | - | 10 nV/°C typ |
| Full-Scale Error | ppm of FSR | - | ±10 ppm max |
| Supply Voltage | V | - | 2.7 V to 3.6 V or 4.75 V to 5.25 V |
| Power Dissipation (at 3 V supply) | mW | - | 3.84 mW typ |
| Operating Temperature | °C | - | –40°C to +85°C |
Key Features
- 24-bit Σ-Δ ADC with PGA for high resolution and low noise.
- Programmable gain front end for flexibility in input signal ranges.
- Simultaneous 50 Hz and 60 Hz rejection for improved accuracy in noisy environments.
- Factory-calibrated single conversion cycle setting for ease of use.
- Configurable as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels.
- On-board PLL generating the required internal operating frequency from a 32 kHz crystal.
- Software programmable output data rate.
- Pin-for-pin compatibility with the 16-bit AD7708, allowing for easy upgrade without hardware modifications.
Applications
The AD7718BRU is ideal for various low-frequency measurement applications, including:
- Industrial process control and monitoring.
- Medical devices requiring high accuracy and low noise.
- Automotive sensors and diagnostics.
- Environmental monitoring systems.
- Test and measurement equipment.
Q & A
- What is the resolution of the AD7718BRU?
The AD7718BRU has a 24-bit resolution. - What are the input signal ranges for the AD7718BRU?
The input signal ranges from ±20 mV to ±2.56 V. - What is the power dissipation of the AD7718BRU when operating from a 3 V supply?
The power dissipation is 3.84 mW typical. - Can the AD7718BRU be configured for different types of input channels?
Yes, it can be configured as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels. - What is the operating temperature range of the AD7718BRU?
The operating temperature range is –40°C to +85°C. - Is the AD7718BRU pin-for-pin compatible with other models?
Yes, it is pin-for-pin compatible with the 16-bit AD7708. - What is the purpose of the on-board PLL in the AD7718BRU?
The on-board PLL generates the required internal operating frequency from a 32 kHz crystal. - Can the output data rate of the AD7718BRU be programmed?
Yes, the output data rate is software programmable. - What are some common applications of the AD7718BRU?
Common applications include industrial process control, medical devices, automotive sensors, environmental monitoring, and test and measurement equipment. - What is the supply voltage range for the AD7718BRU?
The supply voltage range is 2.7 V to 3.6 V or 4.75 V to 5.25 V.
