AD7843ARUZ

AD7843 is a 12bit successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screen. The external reference applied to the device can be varied from 1V to +VCC, while the analogue input range is from 0V to VREF. The device includes a shutdown mode that reduces the current consumption to less than 1µA. This device features on-board switches. This, coupled with low power and high speed operation, make this device ideal for battery-powered systems such as personal digital assistants with resistive touch screens, and other portable equipment. It is widely used in application like personal digital assistants, smart hand-held devices, touch screen monitors, point-of-sales terminals, pagers.

• 4-wire touch screen interface
• Throughput rate is 125KSPS maximum
• Operating voltage range is 2.7V to 3.6V
• Ratiometric conversion
• High speed serial interface
• 2 auxiliary analogue inputs
• Integral nonlinearity is ±2LSB maximum
• Gain error is ±4LSB maximum, offset error is ±6LSB maximum
• Power supply rejection ratio is 70dB typical
• Operating temperature is -40°C to +85°C, package style is 16-lead TSSOP

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