Overview
The AD7873ARQZ, produced by Analog Devices Inc., is a 12-bit successive approximation Analog-to-Digital Converter (ADC) designed specifically for controlling 4-wire resistive touchscreens. This device is integrated with a range of features that enhance touchscreen precision and functionality. It operates from a single supply voltage ranging from 2.2 V to 5.25 V and includes on-chip components such as a 2.5 V reference, temperature sensor, and low on-resistance switches for driving touchscreens. The AD7873 is ideal for applications requiring accurate touch screen control, temperature measurement, and battery monitoring, making it suitable for various portable and industrial devices.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Resolution | 12 bits | ||
| Supply Voltage Range | 2.2 V to 5.25 V | V | Functional from 2.2 V to 5.25 V |
| Throughput Rate | 125 kSPS | kSPS | Maximum with a 2 MHz clock |
| Operating Temperature Range | -40°C to +85°C | °C | |
| On-chip Reference Voltage | 2.5 V | V | Available for external use if buffered |
| Shutdown Current | < 1 µA | µA | Maximum in shutdown mode |
| Package Types | QSOP, TSSOP, LFCSP | 16-lead packages |
Key Features
- 4-wire resistive touchscreen control with low on-resistance switches
- 12-bit resolution for high precision touchscreen interaction
- Built-in 2.5 V reference voltage, which can be used externally if buffered
- On-board temperature measurement capability from -40°C to +85°C
- Touch pressure measurement
- Single-ended or differential input capability
- Serial interface for easy integration with microcontrollers
- Low voltage operation supporting portable and battery-powered devices
- Robust against ESD events and has a long operational life span
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sale terminals
- Pagers
- Portable instrumentation
- Vehicle navigation systems
- Industrial controls
Q & A
- What is the resolution of the AD7873ARQZ?
The AD7873ARQZ has a 12-bit resolution.
- What is the supply voltage range for the AD7873ARQZ?
The supply voltage range is from 2.2 V to 5.25 V.
- What is the maximum throughput rate of the AD7873ARQZ?
The maximum throughput rate is 125 kSPS with a 2 MHz clock.
- Does the AD7873ARQZ have an on-chip temperature sensor?
- Can the AD7873ARQZ measure touch pressure?
- What types of packages are available for the AD7873ARQZ?
The device is available in 16-lead QSOP, TSSOP, and LFCSP packages.
- Is the AD7873ARQZ robust against ESD events?
- How does the AD7873ARQZ conserve power when not in use?
- Can the AD7873ARQZ be easily integrated with microcontrollers?
- What are some common applications of the AD7873ARQZ?
