ADS7844

ADS7844 ADS7844 ADS7844 SBAS100A – JANUARY 1998 – REVISED OCTOBER 2003 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES q SINGLE SUPPLY: 2.7V to 5V q 8-CHANNEL SINGLE-ENDED OR 4-CHANNEL DIFFERENTIAL INPUT q UP TO 200kHz CONVERSION RATE q ±1 LSB MAX INL AND DNL q NO MISSING CODES q 72dB SINAD q SERIAL INTERFACE q 20-LEAD QSOP AND 20-LEAD SSOP PACKAGES q ALTERNATE SOURCE FOR MAX147 APPLICATIONS q DATA ACQUISITION q TEST AND MEASUREMENT q INDUSTRIAL PROCESS CONTROL q PERSONAL DIGITAL ASSISTANTS q BATTERY-POWERED SYSTEMS DESCRIPTION The ADS7844 is an 8-channel, 12-bit sampling analog-todigital converter (ADC) with a synchronous serial interface. Typical power dissipation is 3mW at a 200kHz throughput rate and a +5V supply. The reference voltage (VREF) can be varied between 100mV and VCC, providing a corresponding input voltage range of 0V to VREF. The device includes a shutdown mode that reduces power dissipation to under 1µW. The ADS7844 is ensured down to 2.7V operation. Low power, high speed, and onboard multiplexer make the ADS7844 ideal for battery-operated systems such as personal digital assistants, portable multichannel data loggers, and measurement equipment. The serial interface also provides low-cost isolation for remote data acquisition. The ADS7844 is available in a 20-lead QSOP package and the MAX147 equivalent 20-lead SSOP package and is ensured over the –40°C to +85°C temperature range. CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM VREF Ei...