8-Channel, 1 MSPS, 10-Bit SAR ADCAD7298-1FEATURESFUNCTIONAL BLOCK DIAGRAM10-bit SAR ADCVDDGND8 single-ended inputs Channel sequencer functionalityVREFFast throughput of 1 MSPSREFBUFAnalog input range: 0 V to 2.5 VTemperature range: −40°C to +125°C10-BITVIN0SUCCESSIVESpecified for V of 2.8 V to 3.6 VT/HDDAPPROXIMATIONLogic voltage V= 1.65 V to 3.6 VADCDRIVEPower-down current: <10 µAINPUTVMUXAD7298-1IN7Internal 2.5 V reference Internal power-on resetSEQUENCERSCLKHigh speed serial interface SPIDOUTCONTROLDIN20-lead LFCSPLOGICCSVDRIVE 001 PD/RST 09321- Figure 1. GENERAL DESCRIPTION The AD7298-1 is a 10-bit, high speed, low power, 8-channel, PRODUCT HIGHLIGHTS successive approximation ADC. The part operates from a single 1. Ideal y Suited to Monitoring System Variables in a Variety 3.3 V power supply and features throughput rates up to 1 MSPS. of Systems. This includes telecommunications, and process The device contains a low noise, wide bandwidth track-and-hold and industrial control. amplifier that can handle input frequencies in excess of 30 MHz. 2. High Throughput Rate of 1 MSPS with Low Power The AD7298-1 offers a programmable sequencer, which enables Consumption. the selection of a preprogrammable sequence of channels for 3. Eight Single-Ended Inputs with a Channel Sequencer. A conversion. The device has an on-chip, 2.5 V reference that can consecutive sequence of channels can be selected on which be disabled to al ow the use of an external reference. the ADC cycles and converts. The device offers a 4-wire serial interface compatible with SPI and DSP interface standards. The AD7298-1 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also offers flexible power/throughput rate management options. The part is offered in a 20-lead LFCSP package. Rev. AInformation furnished by Analog Devices is believed to be accurate and reliable. However, noresponsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. NoOne Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.license is granted by implication or otherwise under any patent or patent rights of Analog Devices.Tel: 781.329.4700