AD7843ARQZ: 触摸屏数字转换器
The 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. (View the QSOP Package Dimensions.)
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.
AD7843是一款12位逐次逼近型ADC,具有同步串行接口以及用于驱动触摸屏的低导通电阻开关,采用2.2 V至5.25V单电源供电,吞吐量大于125 kSPS。AD7843采用的外部基准电压,可在1 V至+VCC范围内变化,而模拟输入范围为0 V至VREF。这款器件具有关断模式,此模式下功耗不足1 µA。AD7843提供两种封装：16引脚、0.15英寸、四分之一大小集成封装（QSOP）. 和16引脚超薄紧缩小型封装（TSSOP）。查看QSOP 封装尺寸。（格式： pdf,大小：19,569 字节）
同时也可查看AD7843的同类器件AD7873。AD7873与AD7843相似,但拥有更多功能,例如：一个片内温度传感器（-40°C至+ 85°C）,2.5 V片内基准电压源,以及电池和触摸压力测量。
AD7843ARQZ 特性
- 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
- 4线触摸屏接口
- 额定吞吐量：125 kSPS
- 低功耗：
{zd0}1.37 mW（125 kSPS,VCC = 3.6 V） - 单电源（VCC）：2.2 V至5.25 V
- 比率转换
- 高速串行接口
- 可编程8位或12位分辨率
- 2个辅助模拟输入
- 关断模式：{zd0}1 µA
- 16引脚QSOP和TSSOP封装
- 民用温度范围：0 ºC～＋70 ºC
- xx温度范围：－55ºC ～＋125ºC
- 工业用温度范围：不同型号的产品的温度范围可能不同。
- 汽车工作温度范围：-40 ℃～ +125 ℃
