Overview
The AD7147ACPZ-500RL7 is a high-performance capacitance-to-digital converter (CDC) IC produced by Analog Devices Inc. This device is part of the CapTouch™ family and is designed for use with single-electrode capacitance sensors, implementing functions such as buttons, scroll bars, and wheels. The AD7147 is known for its high sensitivity, noise immunity, and low power consumption, making it suitable for a variety of touch sensing applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Description |
|---|---|---|---|---|---|
| Resolution | 16 bits | No missing codes, guaranteed by design | |||
| Channels | 13 | Capacitance sensor inputs | |||
| Sampling Rate | 250k SPS | Samples per second | |||
| Voltage Supply | 2.6 V | 3.3 V | 3.6 V | V | Single supply operation |
| Communication Protocol | SPI (AD7147), I2C (AD7147-1) | Serial interface protocols | |||
| Operating Temperature | -40°C | +85°C | °C | Qualified for automotive and industrial applications | |
| Package | 24-lead LFCSP_WQ | Exposed pad, surface mount | |||
| Power Consumption | 1 mA (full power), 21.5 μA (low power) | Low operating current |
Key Features
- High-Resolution Touch Sensing: 16-bit resolution with femtofarad sensitivity
- Automatic Calibration and Compensation: On-chip automatic calibration logic and adaptive threshold and sensitivity levels to compensate for environmental changes
- Low Power Consumption: Full power mode: 1 mA, Low power mode: 21.5 μA
- Flexible Communication Interface: SPI-compatible (AD7147) and I2C-compatible (AD7147-1) serial interfaces
- No External RC Components Required: Integrated automatic conversion sequencer and no need for external RC components
- Wake-Up on Touch and Interrupt Output: Wake-up on touch capability and interrupt output along with general-purpose input/output (GPIO)
- Robust Design: Qualified for automotive and industrial applications with reliable performance across wide temperature ranges
Applications
- Consumer Electronics: Touch-sensitive interfaces in consumer devices
- Automotive Control Panels: Touch controls in automotive systems
- Portable Devices: Touch interfaces in handheld and portable devices
- Industrial Touch Controls: Industrial touch panels and control systems
Q & A
- What is the resolution of the AD7147?
The AD7147 has a 16-bit resolution with no missing codes
- How many capacitance sensor inputs does the AD7147 have?
The AD7147 has 13 capacitance sensor inputs
- What is the sampling rate of the AD7147?
The sampling rate is 250k samples per second
- What are the supported communication protocols for the AD7147?
The AD7147 supports SPI and the AD7147-1 supports I2C
- What is the operating temperature range of the AD7147?
The operating temperature range is -40°C to +85°C
- What is the power consumption of the AD7147 in full power and low power modes?
In full power mode, it consumes 1 mA, and in low power mode, it consumes 21.5 μA
- Does the AD7147 require external RC components?
No, the AD7147 does not require external RC components due to its integrated automatic conversion sequencer
- What are some of the key applications of the AD7147?
Key applications include consumer electronics, automotive control panels, portable devices, and industrial touch controls
- Is the AD7147 qualified for automotive applications?
- What is the package type of the AD7147?
The AD7147 is available in a 24-lead LFCSP_WQ package with an exposed pad
