Overview
The AD7879-1ACPZ-500R7, produced by Analog Devices Inc., is a 12-bit successive approximation analog-to-digital converter (SAR ADC) specifically designed for resistive touch screen applications. This device operates with a low power supply ranging from 1.6 V to 3.6 V and features a high throughput rate of 105 kSPS. It is available in a 4 mm × 4 mm, 16-lead lead frame chip scale package (LFCSP) and supports both SPI and I2C serial interfaces. The AD7879-1ACPZ-500R7 includes advanced noise reduction capabilities through programmable median and averaging filters, making it highly suitable for noisy environments such as those near LCDs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Supply Voltage | 1.6 to 3.6 | V |
| Throughput Rate | 105 kSPS | |
| Conversion Time | 9.5 µs (including 2 µs acquisition time) | µs |
| Shutdown Current | < 6 µA | µA |
| Package Type | 16-lead LFCSP | |
| Interface | SPI, I2C | |
| Filter Types | Median, Averaging |
Key Features
- Low Power Operation: The device operates from a single supply voltage ranging from 1.6 V to 3.6 V, making it suitable for battery-powered applications.
- High Throughput Rate: Achieves a throughput rate of 105 kSPS, ensuring fast and efficient data conversion.
- Noise Reduction: Includes programmable median and averaging filters to reduce noise from sources like LCDs.
- Flexible Interface: Supports both SPI and I2C serial interfaces for versatile communication options.
- Low Resistance Analog Switches: Features low resistance analog switches for switching X and Y excitation voltages to the touch screen and on-chip temperature sensor.
- Programmable Conversion Controls: Allows for variable acquisition time, first conversion delay, and up to 16 averages per conversion.
- Auxiliary Input/Battery Monitor/GPIO: A programmable pin can function as an auxiliary input, battery monitor, or general-purpose input/output (GPIO).
Applications
- Resistive Touch Screens: Ideal for controlling and interfacing with resistive touch screens in various devices.
- Portable Electronics: Suitable for battery-powered devices due to its low power consumption.
- Industrial Control Systems: Can be used in industrial settings where robust and reliable touch screen control is necessary.
- Medical Devices: Applicable in medical devices that require precise and noise-resistant touch screen interfaces.
- Consumer Electronics: Used in various consumer electronics such as smartphones, tablets, and other touch-enabled devices.
Q & A
- What is the resolution of the AD7879-1ACPZ-500R7?
The AD7879-1ACPZ-500R7 has a 12-bit resolution.
- What is the operating voltage range of the AD7879-1ACPZ-500R7?
The device operates from a single supply voltage ranging from 1.6 V to 3.6 V.
- What is the throughput rate of the AD7879-1ACPZ-500R7?
The throughput rate is 105 kSPS.
- What types of filters does the AD7879-1ACPZ-500R7 include?
The device includes programmable median and averaging filters.
- What interfaces does the AD7879-1ACPZ-500R7 support?
The device supports both SPI and I2C serial interfaces.
- What is the package type of the AD7879-1ACPZ-500R7?
The device is available in a 16-lead lead frame chip scale package (LFCSP).
- Can the AD7879-1ACPZ-500R7 be used in battery-powered applications?
Yes, it is suitable for battery-powered applications due to its low power consumption.
- What is the purpose of the low resistance analog switches in the AD7879-1ACPZ-500R7?
The low resistance analog switches are used to switch the X and Y excitation voltages to the touch screen and the on-chip temperature sensor.
- Can the AD7879-1ACPZ-500R7 be programmed for different conversion controls?
Yes, it allows for variable acquisition time, first conversion delay, and up to 16 averages per conversion.
- What additional functionalities does the programmable pin offer in the AD7879-1ACPZ-500R7?
The programmable pin can function as an auxiliary input, battery monitor, or general-purpose input/output (GPIO).
