Overview
The AD7147ACPZ-1500RL7, produced by Analog Devices Inc., is a 16-bit capacitance-to-digital converter (CDC) designed for use with capacitance sensors. This CapTouch™ controller is integrated with on-chip environmental calibration, making it suitable for various touch-sensitive applications. The device features a 16-bit, 250 kHz sigma-delta (∑-Δ) converter and supports up to 13 capacitance sensor inputs. It operates on a single supply voltage ranging from 2.6 V to 3.6 V and is available in a 24-lead, 4 mm x 4 mm LFCSP package.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Description |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 2.6 | 3.6 | V | Operating voltage range | |
| Operating Temperature | -40 | 85 | °C | Temperature range for operation | |
| Update Rate | 8.73 | 9 | 9.27 | ms | For 12 conversion stages, decimation = 64 |
| Resolution | 16 | Bits | CINx input range | ||
| CINx Input Range | ±8 | pF | No missing codes | ||
| Power Consumption (Full Power Mode) | 1 | mA | |||
| Power Consumption (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 environmental compensation
- Automatic 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
- Wake-up on touch capability
- On-chip RAM to store calibration data
Applications
- Cell phones
- Personal music and multimedia players
- Smart handheld devices
- Television, A/V, and remote controls
- Gaming consoles
- Digital still cameras
- Automotive applications
Q & A
- What is the AD7147ACPZ-1500RL7 used for?
The AD7147ACPZ-1500RL7 is used as a capacitance-to-digital converter for touch-sensitive applications, including buttons, scroll bars, and wheels.
- What is the operating voltage range of the AD7147ACPZ-1500RL7?
The operating voltage range is from 2.6 V to 3.6 V.
- How many capacitance sensor inputs does the AD7147ACPZ-1500RL7 support?
The device supports up to 13 capacitance sensor inputs.
- Does the AD7147ACPZ-1500RL7 require external RC components?
No, it does not require external RC components.
- What types of serial interfaces are supported by the AD7147ACPZ-1500RL7?
The AD7147 supports SPI-compatible and the AD7147-1 supports I2C-compatible serial interfaces.
- What is the resolution of the capacitance-to-digital converter?
The resolution is 16 bits.
- What is the update rate of the AD7147ACPZ-1500RL7?
The update rate varies depending on the decimation factor, but for 12 conversion stages with decimation = 64, it is approximately 9 ms.
- Does the AD7147ACPZ-1500RL7 have wake-up on touch capability?
- What is the package type of the AD7147ACPZ-1500RL7?
- Is the AD7147ACPZ-1500RL7 qualified for automotive applications?
- What is the power consumption in full power mode and low power mode?
