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ADS7845

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 CONTROLApplication·PERSONAL DIGITAL ASSISTANTS·PORTABLE INSTRUMENTS·POINT-OF-SALES TERM...

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SeekIC No. : 004277257 Detail

ADS7845: 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·FUL...

ADS7845 Data Sheet

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Part Number:
ADS7845
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Application

·PERSONAL DIGITAL ASSISTANTS
·PORTABLE INSTRUMENTS
·POINT-OF-SALES TERMINALS
·PAGERS
·TOUCH-SCREEN MONITORS


Pinout

Connection Diagram


Specifications

+VCC to GND .............................................................. 0.3V to +6V
Analog Inputs to GND .................................... 0.3V to +VCC + 0.3V
Digital Inputs to GND ..................................... 0.3V to +VCC + 0.3V
Power Dissipation ................................................................ 250mW
Maximum Junction Temperature ......................................... +150°C
Operating Temperature Range ..........................  40°C to +85°C
Storage Temperature Range ............................ 65°C to +150°C
Lead Temperature (soldering, 10s) .................................... +300°C
NOTE: (1) Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability.


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 750mW 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 0.5mW.

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 available in a 16-lead SSOP package and is guaranteed over the 40°C to +85°C temperature range.




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