Overview
The AD7747ARUZ-REEL7, produced by Analog Devices Inc., is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC). This device is designed to measure capacitance directly connected to its inputs, making it suitable for various capacitive sensing applications. The AD7747 features inherent high resolution, high linearity, and high accuracy, making it a robust solution for precise capacitance measurements.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Conversion Input Range | ±8.192 pF | pF | Factory calibrated | ||
| Update Rate | 5 Hz | 45 Hz | Hz | ||
| Resolution (Temperature Sensor) | 0.1°C | °C | |||
| Accuracy (Temperature Sensor) | ±2°C | °C | |||
| Power Supply Voltage | 2.7 V | 5.25 V | V | Single-supply operation | |
| Current Consumption | 0.7 mA | mA | |||
| Operating Temperature | -40°C | 125°C | °C | ||
| Package Type | 16-Lead TSSOP | ||||
| Interface | 2-Wire, I2C compatible |
Key Features
- High-resolution, Σ-Δ capacitance-to-digital conversion with up to 19.5-bit effective resolution and ±10 fF factory calibration accuracy.
- High linearity (±0.01%) and high accuracy in capacitance measurements.
- On-chip temperature sensor with 0.1°C resolution and ±2°C accuracy.
- Internal clock oscillator and voltage reference, eliminating the need for external components.
- 2-wire, I2C-compatible serial interface for easy communication.
- Active shield for shielding sensor connections and simultaneous 50 Hz and 60 Hz rejection at 8.1 Hz update rate.
- Single-ended or differential capacitive sensor support with one plate connected to ground.
Applications
- Automotive systems: Pressure measurement, position sensing, proximity sensing, level sensing, and flow metering.
- Industrial systems: Similar applications as automotive, including impurity detection.
- Medical systems: Precise capacitance measurements for various medical devices.
Q & A
- What is the AD7747ARUZ-REEL7 used for?
The AD7747ARUZ-REEL7 is a high-resolution, Σ-Δ capacitance-to-digital converter used for precise capacitance measurements in various applications such as automotive, industrial, and medical systems.
- What is the resolution of the temperature sensor in the AD7747?
The temperature sensor in the AD7747 has a resolution of 0.1°C and an accuracy of ±2°C.
- What is the operating temperature range of the AD7747?
The AD7747 operates over a temperature range of -40°C to 125°C.
- What type of interface does the AD7747 use?
The AD7747 uses a 2-wire, I2C-compatible serial interface.
- What is the power supply voltage range for the AD7747?
The AD7747 can operate with a single power supply voltage ranging from 2.7 V to 5.25 V.
- What is the typical current consumption of the AD7747?
The typical current consumption of the AD7747 is 0.7 mA.
- What type of package does the AD7747 come in?
The AD7747 comes in a 16-Lead TSSOP package.
- Does the AD7747 support differential capacitive sensors?
Yes, the AD7747 supports both single-ended and differential capacitive sensors with one plate connected to ground.
- What are some common applications of the AD7747?
The AD7747 is commonly used in automotive, industrial, and medical systems for applications such as pressure measurement, position sensing, proximity sensing, level sensing, and flow metering.
- Does the AD7747 have any built-in calibration features?
Yes, the AD7747 has built-in calibration features including a programmable on-chip digital-to-capacitance converter (CAPDAC) for balancing common-mode capacitance.
