Overview
The AD7843ARUZ-REEL7, produced by Analog Devices Inc., is a 12-bit successive approximation analog-to-digital converter (ADC) designed specifically for touch screen applications. This component features a synchronous serial interface and low on-resistance switches, making it ideal for driving touch screens efficiently. It operates on a single supply voltage ranging from 2.2 V to 5.25 V, offering low power consumption and high throughput rates of up to 125 kSPS with a 2 MHz clock.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12-bit (programmable 8-bit or 12-bit) |
| Throughput Rate | 125 kSPS max |
| Supply Voltage | 2.2 V to 5.25 V |
| Power Consumption | 1.37 mW max at 125 kSPS with VCC = 3.6 V |
| Conversion Time | 12 DCLK cycles max |
| Track-and-Hold Acquisition Time | 3 DCLK cycles min |
| Input High Voltage | 2.4 V min |
| Input Low Voltage | 0.4 V max |
| Output High Voltage | VCC − 0.2 V min (ISOURCE = 250 µA) |
| Output Low Voltage | 0.4 V max (ISINK = 250 µA) |
| Package Type | 16-lead TSSOP |
Key Features
- 4-wire touch screen interface
- Low power consumption
- High speed serial interface
- Programmable 8-bit or 12-bit resolution
- Two auxiliary analog inputs
- Shutdown mode with low current consumption (1 µA max)
- Ratiometric conversion
- On-chip track-and-hold, multiplexer, ADC, and serial interface
Applications
The AD7843ARUZ-REEL7 is primarily used in touch screen applications, including resistive touch screens in various devices such as smartphones, tablets, and industrial control panels. Its low power consumption and high throughput rate make it suitable for battery-powered devices and applications requiring fast and accurate touch screen data acquisition.
Q & A
- What is the resolution of the AD7843ARUZ-REEL7? The AD7843ARUZ-REEL7 has a programmable resolution of either 8-bit or 12-bit.
- What is the maximum throughput rate of the AD7843ARUZ-REEL7? The maximum throughput rate is 125 kSPS.
- What is the supply voltage range for the AD7843ARUZ-REEL7? The supply voltage range is from 2.2 V to 5.25 V.
- How much power does the AD7843ARUZ-REEL7 consume at 125 kSPS with VCC = 3.6 V? The power consumption is 1.37 mW max.
- What type of interface does the AD7843ARUZ-REEL7 use? It uses a synchronous serial interface.
- What is the package type of the AD7843ARUZ-REEL7? The package type is 16-lead TSSOP.
- Does the AD7843ARUZ-REEL7 have a shutdown mode? Yes, it has a shutdown mode with a current consumption of 1 µA max.
- What are the auxiliary inputs on the AD7843ARUZ-REEL7? There are two auxiliary analog inputs.
- How does the AD7843ARUZ-REEL7 handle touch screen settling time? It can operate in differential mode, maintain touch screen drivers on, or use a 15 DCLK cycle mode to handle settling time.
- What is the typical application of the AD7843ARUZ-REEL7? It is primarily used in resistive touch screen applications.
