Overview
The AD7873ACPZ-REEL, produced by Analog Devices Inc., is a 12-bit successive approximation analog-to-digital converter (ADC) designed specifically for touch screen applications. This device integrates multiple functionalities, including direct battery measurement, temperature measurement, and touch pressure measurement. It operates from a single supply voltage ranging from 2.2 V to 5.25 V and features a throughput rate of 125 kSPS. The AD7873 is housed in a compact 16-lead QSOP, TSSOP, or LFCSP package, offering significant space-saving advantages.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Resolution | 12 bits | ||
| Interface | Serial | ||
| Voltage Supply | 2.2 V to 5.25 V | V | |
| Operating Temperature | -40°C to 85°C | °C | |
| Conversion Rate | 125 kSPS | kSPS | Maximum throughput rate |
| Conversion Time | 12 DCLK cycles | DCLK cycles | Maximum conversion time |
| Track-and-Hold Acquisition Time | 3 DCLK cycles | DCLK cycles | Minimum track-and-hold acquisition time |
| Output Coding | Straight (Natural) Binary | ||
| Shutdown Current | < 1 µA | µA | Maximum current in shutdown mode |
| Package | 16-VQFN Exposed Pad, CSP |
Key Features
- On-board 2.5 V reference voltage, which can be used for auxiliary input, battery monitor, and temperature measurement.
- Low on-resistance switches for driving touch screens.
- Direct battery measurement and temperature measurement capabilities.
- Touch pressure measurement.
- Shutdown mode to reduce power consumption to less than 1 µA.
- External reference option, variable from 1 V to VCC.
- On-chip track-and-hold, multiplexer, ADC, reference, temperature sensor, and serial interface.
Applications
- Personal digital assistants.
- Smart hand-held devices.
- Touch screen monitors.
- Point-of-sale terminals.
- Pagers.
Q & A
- What is the resolution of the AD7873ADC?
The AD7873 has a resolution of 12 bits. - What is the operating voltage range of the AD7873?
The AD7873 operates from a single supply voltage ranging from 2.2 V to 5.25 V. - What is the maximum throughput rate of the AD7873?
The maximum throughput rate of the AD7873 is 125 kSPS. - Does the AD7873 have an on-board reference voltage?
Yes, the AD7873 has an on-board 2.5 V reference voltage. - What are the package options for the AD7873?
The AD7873 is available in 16-lead QSOP, TSSOP, or LFCSP packages. - What is the shutdown current of the AD7873?
The shutdown current of the AD7873 is less than 1 µA. - Can the AD7873 measure battery voltage and temperature?
Yes, the AD7873 can measure battery voltage and temperature directly. - What is the operating temperature range of the AD7873?
The operating temperature range of the AD7873 is from -40°C to 85°C. - Does the AD7873 support external reference voltage?
Yes, the AD7873 supports an external reference voltage that can be varied from 1 V to VCC. - What are some typical applications of the AD7873?
The AD7873 is typically used in personal digital assistants, smart hand-held devices, touch screen monitors, point-of-sale terminals, and pagers.
