Datasheet AD7298-1 (Analog Devices)

8-Channel, 1 MSPS, 10-Bit SAR ADC AD7298-1 FEATURES FUNCTIONAL BLOCK DIAGRAM 10-bit SAR ADC VDD GND 8 single-ended inputs Channel sequencer functionality VREF Fast throughput of 1 MSPS REF BUF Analog input range: 0 V to 2.5 V Temperature range: −40°C to +125°C 10-BIT VIN0 SUCCESSIVE Specified for V of 2.8 V to 3.6 V T/H DD APPROXIMATION Logic voltage V = 1.65 V to 3.6 V ADC DRIVE Power-down current: <10 µA INPUT V MUX AD7298-1 IN7 Internal 2.5 V reference Internal power-on reset SEQUENCER SCLK High speed serial interface SPI DOUT CONTROL DIN 20-lead LFCSP LOGIC CS VDRIVE
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.
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Document Outline Features Functional Block Diagram General Description Product Highlights Revision History Specifications Timing Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Description Typical Performance Characteristics Terminology Circuit Information Converter Operation Analog Input ADC Transfer Function VDRIVE The Internal or External Reference Control Register Modes of Operation Traditional Multichannel Mode of Operation Repeat Operation Power-Down Modes Normal Mode Partial Power-Down Mode Full Power-Down Mode Powering Up the AD7298-1 Reset Serial Interface Layout and Configuration Outline Dimensions Ordering Guide