AD7298

Preliminary Technical Data FEATURES 12 bit SAR ADC 8 single-ended inputs Channel sequencer functionality Fast throughput of 1Msps Analog Input Range 0 to 2.5V 12-bit temperature-to-digital converter Temperature sensor accuracy of ±2°C typical Temperature range: −40°C to +125°C Specified for VDD of 2.8 V to 3.6V Logic Voltage VDRIVE = 1.65V to 3.6V Power-down current : <10 µA Internal 2.5V Reference Internal Power on Reset High speed serial interface SPI™ 20-lead LFCSP 8-Channel, 1MSPS, 12-Bit SAR ADC with Temperature Sensor AD7298 FUNCTIONAL BLOCK DIAGRAM Figure 1. GENERAL DESCRIPTION The AD7298 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3V power supply and features throughput rates up to 1MSPS. The device contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 70 MHz. The AD7298 offers a programmable sequencer, which enables the selection of a pre-programmable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be www.DataSheet4U.com disabled to allow the use of an external reference. The AD7298 includes a high accuracy band-gap temperature sensor, which is monitored and digitized by the12-bit ADC to give a resolution of 0.25°C. The device offers a 4-wire serial interface compatible with SPI, and DSP interface standards. The AD7298 uses advanced design techniques to achieve very low...