Overview
The AD7843ARQZ is a 12-bit successive approximation analog-to-digital converter (ADC) designed by Analog Devices Inc. This component is specifically tailored for touch screen digitizer applications, offering high performance, low power consumption, and a compact package. It operates from a single supply voltage ranging from 2.2 V to 5.25 V, making it suitable for battery-powered systems.
Key Specifications
| Parameter | Specification |
|---|---|
| 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 |
| Shutdown Current | 1 µA max |
| Interface | High speed serial interface |
| Package | 16-lead QSOP and TSSOP |
| Analog Input Range | 0 V to VREF (where VREF can be between 1 V and VCC) |
| Conversion Time | 12 DCLK cycles max |
| Track-and-Hold Acquisition Time | 3 DCLK cycles min |
Key Features
- 4-wire touch screen interface
- Low power consumption: 1.37 mW max at 125 kSPS with VCC = 3.6 V
- High speed serial interface
- Programmable 8-bit or 12-bit resolution
- 2 auxiliary analog inputs
- Shutdown mode: 1 µA max
- Ratiometric conversion
- On-chip track-and-hold, multiplexer, ADC, and serial interface
- Low on-resistance switches for driving touch screens
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sales terminals
- Pagers
- Other portable equipment with resistive touch screens
Q & A
- What is the resolution of the AD7843ARQZ?
The AD7843ARQZ has a programmable resolution of either 8-bit or 12-bit.
- What is the maximum throughput rate of the AD7843ARQZ?
The maximum throughput rate is 125 kSPS.
- What is the operating supply voltage range for the AD7843ARQZ?
The operating supply voltage range is from 2.2 V to 5.25 V.
- How much power does the AD7843ARQZ consume at maximum throughput?
The power consumption is 1.37 mW max at 125 kSPS with VCC = 3.6 V.
- What is the current consumption in shutdown mode?
The current consumption in shutdown mode is less than 1 µA.
- What types of packages are available for the AD7843ARQZ?
The component is available in 16-lead QSOP and TSSOP packages.
- What is the analog input range for the AD7843ARQZ?
The analog input range is from 0 V to VREF, where VREF can be between 1 V and VCC.
- Does the AD7843ARQZ have any auxiliary analog inputs?
Yes, it has 2 auxiliary analog inputs.
- What is the primary application of the AD7843ARQZ?
The primary application is for touch screen digitizer systems in various portable devices.
- Is the AD7843ARQZ suitable for battery-powered systems?
Yes, it is suitable due to its low power consumption and high speed operation.
