Overview
The AD7873ARUZ-REEL, produced by Analog Devices Inc., is a 12-bit successive approximation Analog-to-Digital Converter (ADC) designed with a synchronous serial interface. This device is particularly suited for applications requiring low on-resistance switches, making it ideal for driving touch screens. The AD7873 operates from a single supply voltage ranging from 2.2 V to 5.25 V and features a throughput rate of 125 kSPS when provided with a 2 MHz clock. It includes on-chip components such as a track-and-hold circuit, multiplexer, ADC, reference, temperature sensor, and serial interface, all housed in compact 16-lead QSOP, TSSOP, or LFCSP packages.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 12-bit |
| Conversion Rate | 125 kSPS |
| Supply Voltage | 2.2 V to 5.25 V |
| Analog Input Range | 0 V to VREF (externally applied VREF: 1 V to +VCC) |
| On-board Reference | 2.5 V |
| Package Types | 16-lead QSOP, TSSOP, LFCSP |
| Shutdown Current | < 1 µA |
| Clock Frequency | Up to 2 MHz |
Key Features
- Direct battery measurement, temperature measurement, and touch pressure measurement capabilities.
- On-board 2.5 V reference that can be used for auxiliary input, battery monitor, and temperature measurement modes.
- Low on-resistance switches for driving touch screens.
- On-chip track-and-hold circuit, multiplexer, ADC, reference, temperature sensor, and serial interface.
- Shutdown mode to reduce current consumption to less than 1 µA.
- Compact 16-lead QSOP, TSSOP, or LFCSP packages for space-saving designs.
Applications
- Personal digital assistants.
- Smart hand-held devices.
- Touch screen monitors.
- Point-of-sale terminals.
- Pagers.
Q & A
- What is the resolution of the AD7873 ADC?
The AD7873 is a 12-bit successive approximation ADC.
- What is the conversion rate of the AD7873?
The AD7873 has a throughput rate of 125 kSPS.
- What is the supply voltage range for the AD7873?
The AD7873 operates from a single supply voltage ranging from 2.2 V to 5.25 V.
- What types of packages are available for the AD7873?
The AD7873 is available in 16-lead QSOP, TSSOP, and LFCSP packages.
- Does the AD7873 have an on-board reference voltage?
Yes, the AD7873 has an on-board 2.5 V reference voltage.
- What is the purpose of the low on-resistance switches in the AD7873?
The low on-resistance switches are designed for driving touch screens.
- Can the AD7873 measure battery voltage and temperature?
Yes, the AD7873 has capabilities for direct battery measurement and temperature measurement.
- How much current does the AD7873 consume in shutdown mode?
In shutdown mode, the AD7873 consumes less than 1 µA.
- What is the maximum clock frequency for the AD7873?
The maximum clock frequency for the AD7873 is up to 2 MHz.
- What types of devices typically use the AD7873?
The AD7873 is typically used in personal digital assistants, smart hand-held devices, touch screen monitors, point-of-sale terminals, and pagers.
