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ADS7845E
FEATURES
5-WIRE TOUCH SCREEN INTERFACE
RATIOMETRIC CONVERSION
SINGLE SUPPLY: 2V to 5V
UP TO 125kHz CONVERSION RATE
SERIAL INTERFACE
PROGRAMMABLE 8- OR 12-BIT RESOLUTION
AUXILIARY ANALOG INPUTS
FULL POWER-DOWN CONTROL
APPLICATIONS
PERSONAL DIGITAL ASSISTANTS
PORTABLE INSTRUMENTS
POINT-OF-SALES TERMINALS
PAGERS
TOUCH-SCREEN MONITORS
DESCRIPTION
The ADS7845 is a 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface and low on-resistance switches for driving touch screens. Typical power dissipation is 750µW at a 125kHz throughput rate and a +2.7V supply. The reference voltage (VREF ) can be varied between 1V and +VCC , providing a corresponding input voltage range of 0V to VREF . The device includes a shutdown mode which reduces typical power dissipation to under 0.5µW. The ADS7845 is guaranteed down to 2.7V operation.
Low power, high speed, and on-board switches make the ADS7845 ideal for battery-operated systems such as personal digital assistants with resistive touch screens and other portable equipment. The ADS7845 is avail able in a 16-lead SSOP package and is guaranteed over the –40°C to +85°C temperature range.
INFORMATION
| Category | | |
| Manufacturer | Texas Instruments | |
| Series | - | |
| Packaging | Tube | |
| Part Status | Active | |
| Touchscreen | 5 Wire Resistive | |
| Resolution (Bits) | 12 b | |
| Interface | Serial | |
| Voltage Reference | External | |
| Voltage - Supply | 2.7V ~ 5.5V | |
| Current - Supply | 280 µA | |
| Operating Temperature | -40°C ~ 85°C | |
| Mounting Type | Surface Mount | |
| Package / Case | 16-SSOP (0.154", 3.90mm Width) | |
| Supplier Device Package | 16-SSOP | |
| Base Product Number |
Drawing
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