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ADS7845E
andnbsp;
FEATURES
andnbsp;5-WIRE TOUCH SCREEN INTERFACE
andnbsp;RATIOMETRIC CONVERSION
andnbsp;SINGLE SUPPLY: 2V to 5V
andnbsp;UP TO 125kHz CONVERSION RATE
andnbsp;SERIAL INTERFACE
andnbsp;PROGRAMMABLE 8- OR 12-BIT RESOLUTION
andnbsp;AUXILIARY ANALOG INPUTS
andnbsp;FULL POWER-DOWN CONTROL
andnbsp;
APPLICATIONS
andnbsp;PERSONAL DIGITAL ASSISTANTS
andnbsp;PORTABLE INSTRUMENTS
andnbsp;POINT-OF-SALES TERMINALS
andnbsp;PAGERS
andnbsp;TOUCH-SCREEN MONITORS
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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 750andmicro;W 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 0.5andmicro;W. 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 andndash;40anddeg;C to +85anddeg;C temperature range.
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INFORMATION
Category | andnbsp; | |
Manufacturer | Texas Instruments | andnbsp; |
Series | - | andnbsp; |
Packaging | Tube | andnbsp; |
Part Status | Active | andnbsp; |
Touchscreen | 5 Wire Resistive | andnbsp; |
Resolution (Bits) | 12 b | andnbsp; |
Interface | Serial | andnbsp; |
Voltage Reference | External | andnbsp; |
Voltage - Supply | 2.7V ~ 5.5V | andnbsp; |
Current - Supply | 280 andmicro;A | andnbsp; |
Operating Temperature | -40anddeg;C ~ 85anddeg;C | andnbsp; |
Mounting Type | Surface Mount | andnbsp; |
Package / Case | 16-SSOP (0.154andquot;, 3.90mm Width) | andnbsp; |
Supplier Device Package | 16-SSOP | andnbsp; |
Base Product Number |
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Drawing
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