AD7843ARQZ Datasheet PDF - ADI

Product Details

●The AD7843 is a 12-bit successive-approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The part operates from a single 2.2 V to 5.25 V power supply and features throughput rates greater than 125 kSPS. The external reference applied to the AD7843 can be varied from 1 V to +VCC, while the analog input range is from 0 V to VREF. The device includes a shutdown mode that reduces the current consumption to less than 1 µA. This part is available in a 16-lead 0.15" Quarter Size Outline (QSOP) package and a 16-lead Thin Shrink Small Outline (TSSOP) package. 

●Also see the AD7843 sister part, which is the AD7873. This part is similar to the AD7843 but has added functionality such as an on-chip temperature sensor (-40°C to + 85°C), on-chip 2.5 V reference and direct battery and touch-pressure measurement.

●### Features and Benefits

● 4-wire touch screen interface

● Specified throughput rate of 125 kSPS

● Low power consumption:

●1.37 mW max at 125 kSPS with VCC = 3.6 V

● Single supply, VCC of 2.2 V to 5.25 V

● Ratiometric conversion

● High speed serial interface

● Programmable 8-bit or 12-bit resolution

● 2 auxiliary analog inputs

● Shutdown mode: 1 µA max

● 16-lead QSOP and TSSOP packages