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
