AD7879-1ACPZ-500R7

AD7879 is a 12bit successive approximation analogue-to-digital converter (SAR ADCs) with a synchronous serial interface and low on-resistance switches for driving 4-wire resistive touch screens. It works with a very low power supply of 1.6V to 3.6V and features a throughput rate of 105KSPS. This device includes a shutdown mode that reduces current consumption to less than 6μA. To reduce the effects of noise from LCDs and other sources, this device contains a pre-processing block. The pre-processing function consists of a median filter and an averaging filter. The combination of these two filters provides a more robust solution, discarding the spurious noise in the signal and keeping only the data of interest. The size of both filters is programmable. It is widely used in applications such as personal digital assistants, smart handheld devices, touch screen monitors, point-of-sale terminals, medical devices, cell phones etc.

• Median and averaging filter to reduce noise
• Automatic conversion sequencer and timer
• User-programmable conversion parameters
• Auxiliary analogue input/battery monitor (0.5V to 5V)
• 1 optional GPIO, interrupt outputs (INT, PENIRQ)
• Touch-pressure measurement, wake-up on touch function
• Noise is 70µV rms typical at (VCC = 1.6V to 3.6V)
• Integral nonlinearity is ±3LSB max at (LSB size = 390µV)
• Conversion time is 9.5µs typ at (VCC = 1.6V to 3.6V), I²C interface
• Operating temperature range from -40°C to +85°C, package style is 16-lead LFCSP

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