Overview
The AD7147PACPZ-1500R7, produced by Analog Devices Inc., is a programmable capacitance-to-digital converter (CDC) designed for use with capacitance sensors. This component is part of the CapTouch™ controller family and is optimized for implementing functions such as buttons, scroll bars, and wheels in various electronic devices. The AD7147 features on-chip environmental calibration, automatic compensation for environmental changes, and adaptive threshold and sensitivity levels, making it suitable for a wide range of applications, including ultrathin designs that require only one PCB layer.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 2.6 | 3.6 | V | ||
| Operating Temperature | -40 | 85 | °C | ||
| Conversion Rate | 111 | sps | |||
| Resolution | 16 Bits | No Missing Codes | |||
| Update Rate | 8.73 | 9 | 9.27 | ms | 12 conversion stages, decimation = 64 |
| Interface | SPI (AD7147), I2C (AD7147-1) | ||||
| Package Type | 24-lead, 4 mm * 4 mm LFCSP | ||||
| Operating Current (Full Power Mode) | 1 | mA | |||
| Operating Current (Low Power Mode) | 21.5 | μA |
Key Features
- Programmable capacitance-to-digital converter (CDC) with femtofarad resolution.
- 13 capacitance sensor inputs with automatic conversion sequencer.
- No external RC components required.
- On-chip automatic calibration logic and automatic compensation for environmental changes.
- Adaptive threshold and sensitivity levels.
- SPI-compatible (AD7147) and I2C-compatible (AD7147-1) serial interfaces.
- Interrupt output and general-purpose input/output (GPIO).
- Active shield output to minimize noise pickup in the sensor.
- Low operating current with full power mode at 1 mA and low power mode at 21.5 μA.
- Qualified for automotive applications.
Applications
- Cell phones
- Personal music and multimedia players
- Smart handheld devices
- Television, A/V, and remote controls
- Gaming consoles
- Digital still cameras
Q & A
- What is the AD7147PACPZ-1500R7 used for?
The AD7147PACPZ-1500R7 is used as a programmable capacitance-to-digital converter (CDC) for implementing functions such as buttons, scroll bars, and wheels in various electronic devices.
- What are the key interfaces supported by the AD7147?
The AD7147 supports SPI (Serial Peripheral Interface) and the AD7147-1 supports I2C (Inter-Integrated Circuit) interfaces.
- What is the resolution of the AD7147 CDC?
The resolution of the AD7147 CDC is 16 bits.
- What is the operating temperature range of the AD7147?
The operating temperature range is from -40°C to +85°C.
- Does the AD7147 require external RC components?
No, the AD7147 does not require external RC components.
- What is the typical operating current in full power mode?
The typical operating current in full power mode is 1 mA.
- What is the typical operating current in low power mode?
The typical operating current in low power mode is 21.5 μA.
- Is the AD7147 qualified for automotive applications?
Yes, the AD7147 is qualified for automotive applications.
- What package type is the AD7147 available in?
The AD7147 is available in a 24-lead, 4 mm * 4 mm LFCSP package.
- Does the AD7147 have on-chip calibration logic?
Yes, the AD7147 has on-chip automatic calibration logic to compensate for environmental changes.
