触摸屏控制器 Touch Screen Controller
Product Details
The AD7877 is a 12-bit, successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7877 operates from a single 2.7 V to 5.25 V power supply functional operation to 2.2 V, and features throughput rates of 125 kSPS. The AD7877 features direct battery measurement on two inputs, temperature and touch-pressure measurement.
The AD7877 also has an on-board reference of 2.5 V. When not in use, it can be shut down to conserve power. An external reference can also be applied and varied from 1 V to +VCC, with an analog input range of 0 V to VREF. The device includes a shutdown mode that reduces its current consumption to less than 1 μA.
To reduce the effects of noise from LCDs, the acquisition phase of the on-board ADC is controlled via the STOPACQ pin. User-programmable conversion controls include variable acquisition time and first conversion delay. Up to 16 averages can be taken per conversion. There is also an on-board DAC for LCD back-light or contrast control. The AD7877 runs in either slave or master mode using a conversion sequencer and timer. It is ideal for battery-powered systems such as personal digital assistants with resistive touch screens and other portable equipment.
The part is available in a 32-lead lead frame chip scale package LFCSP, and a 25-ball wafer level chip scale package WLCSP. AD7877W model is qualified for automotive applications.
**Applications**
### Features and Benefits
−40°C to +85°C
电源电压DC 3.00 V
供电电流 1 µA
通道数 8
负载电容 100 pF
位数 12
耗散功率 3.20 mW
分辨率Bits 12.0
输入电容 30.0 pF
工作温度Max 85 ℃
工作温度Min -40 ℃
电源电压 2.7V ~ 5.25V
安装方式 Surface Mount
引脚数 32
封装 VFQFN-32
封装 VFQFN-32
工作温度 -40℃ ~ 85℃
产品生命周期 Active
包装方式 Tape & Reel TR
RoHS标准 RoHS Compliant
含铅标准 Lead Free
军工级 No
ECCN代码 EAR99
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
AD7877ACPZ-REEL7 ADI 亚德诺 | 当前型号 | 当前型号 |
AD7843ARQZ 亚德诺 | 功能相似 | AD7877ACPZ-REEL7和AD7843ARQZ的区别 |
AD7877ACPZ-500RL7 亚德诺 | 功能相似 | AD7877ACPZ-REEL7和AD7877ACPZ-500RL7的区别 |