Overview
The AD7879-1ACPZ-RL, produced by Analog Devices Inc., is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed specifically for controlling resistive touch screens. 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 includes low on-resistance analog switches for driving the touch screen and incorporates advanced noise reduction techniques such as median and averaging filters to enhance signal quality.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12 bits |
| Throughput Rate | 105 kSPS |
| Power Supply | 1.6 V to 3.6 V |
| Package Type | 16-lead LFCSP (4 mm x 4 mm) |
| Shutdown Current | < 6 μA |
| Interface | Synchronous Serial (SPI), I2C (for AD7879-1) |
| Filtering | Median and Averaging Filters |
| Acquisition Time | Programmable |
| Conversion Mode | Slave or Standalone (Master) Mode |
Key Features
- Low on-resistance analog switches for driving 4-wire resistive touch screens.
- Advanced noise reduction using median and averaging filters.
- Programmable acquisition time and first conversion delay.
- Up to 16 averages per conversion.
- Automatic conversion sequencer and timer.
- Programmable pin for auxiliary input, battery monitor, or GPIO.
- Wake-up on touch function and shutdown mode for low power consumption.
- On-chip temperature sensor and result registers.
Applications
- Personal digital assistants.
- Smart handheld devices.
- Touch screen monitors.
- Point-of-sale terminals.
- Medical devices.
- Cell phones.
Q & A
- What is the resolution of the AD7879-1ACPZ-RL?
The AD7879-1ACPZ-RL has a resolution of 12 bits. - What is the throughput rate of the AD7879-1ACPZ-RL?
The throughput rate is 105 kSPS. - What is the power supply range for the AD7879-1ACPZ-RL?
The power supply range is from 1.6 V to 3.6 V. - What type of package does the AD7879-1ACPZ-RL come in?
The device comes in a 16-lead LFCSP package (4 mm x 4 mm). - What is the shutdown current of the AD7879-1ACPZ-RL?
The shutdown current is less than 6 μA. - What interfaces does the AD7879-1ACPZ-RL support?
The device supports synchronous serial (SPI) and I2C interfaces (for AD7879-1). - Does the AD7879-1ACPZ-RL have noise reduction features?
Yes, it includes median and averaging filters for noise reduction. - Can the acquisition time be programmed on the AD7879-1ACPZ-RL?
Yes, the acquisition time is programmable. - What conversion modes does the AD7879-1ACPZ-RL support?
The device supports both slave and standalone (master) conversion modes. - Does the AD7879-1ACPZ-RL have a wake-up on touch function?
Yes, it includes a wake-up on touch function.
