Overview
The AD7843ARUZ, produced by Analog Devices Inc., is a 12-bit successive approximation Analog-to-Digital Converter (ADC) designed specifically for touch screen applications. It features a synchronous serial interface and low on-resistance switches, making it ideal for driving resistive touch screens in various portable and battery-powered devices. The device operates from a single supply voltage ranging from 2.2 V to 5.25 V and is known for its high throughput rate and low power consumption.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | Programmable 8-bit or 12-bit |
| Throughput Rate | Up to 125 kSPS |
| Supply Voltage | 2.2 V to 5.25 V |
| Power Consumption | 1.37 mW max at 125 kSPS with VCC = 3.6 V |
| Shutdown Current | Less than 1 µA |
| Input Range | 0 V to VREF (1 V to +VCC) |
| Package Type | 16-lead QSOP and TSSOP |
| Logic Input High Voltage | 2.4 V min |
| Logic Input Low Voltage | 0.4 V max |
| Output High Voltage | VCC - 0.2 V min (ISOURCE = 250 µA) |
Key Features
- 4-wire touch screen interface
- High speed serial interface
- Ratiometric conversion
- Low power consumption
- Programmable resolution (8-bit or 12-bit)
- Two auxiliary analog inputs
- Shutdown mode with current consumption less than 1 µA
- On-chip track-and-hold, multiplexer, and ADC
- Low on-resistance switches for driving touch screens
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sales terminals
- Pagers and other portable equipment
Q & A
- What is the resolution of the AD7843ARUZ?
The AD7843ARUZ has a programmable resolution of either 8-bit or 12-bit.
- What is the throughput rate of the AD7843ARUZ?
The throughput rate of the AD7843ARUZ is up to 125 kSPS.
- What is the supply voltage range for the AD7843ARUZ?
The AD7843ARUZ operates from a single supply voltage ranging from 2.2 V to 5.25 V.
- How much power does the AD7843ARUZ consume?
The AD7843ARUZ consumes a maximum of 1.37 mW at 125 kSPS with VCC = 3.6 V.
- What is the shutdown current of the AD7843ARUZ?
The shutdown current of the AD7843ARUZ is less than 1 µA.
- What types of packages are available for the AD7843ARUZ?
The AD7843ARUZ is available in 16-lead QSOP and TSSOP packages.
- What is the input range for the AD7843ARUZ?
The input range for the AD7843ARUZ is from 0 V to VREF (1 V to +VCC).
- Does the AD7843ARUZ have any auxiliary analog inputs?
Yes, the AD7843ARUZ has two auxiliary analog inputs.
- What are some common applications of the AD7843ARUZ?
The AD7843ARUZ is commonly used in personal digital assistants, smart hand-held devices, touch screen monitors, point-of-sales terminals, and pagers.
- How does the AD7843ARUZ interface with touch screens?
The AD7843ARUZ interfaces with touch screens through a 4-wire touch screen interface and low on-resistance switches.
