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1FEATURES

2? Specified Over a Range of Sample Rates.

? Four Input Channels

? Variable Power Management

? Single Power Supply with 2.7V - 5.25V Range

APPLICATIONS

? Portable Systems

? Remote Data Acquisition

? Instrumentation and Control Systems

KEY SPECIFICATIONS

? DNL: +0.4 / ?0.2 LSB (typ)

? INL: ± 0.35 LSB (typ)

? SNR: 72.0 dB (typ)

? Power Consumption

– 3V Supply: 2.2 mW (typ)

– 5V Supply: 7.9 mW (typ)

DESCRIPTION

The ADC124S021 is a low-power, four-channel CMOS 12-bit analog-to-digital converter with a high-

speed serial interface. Unlike the conventional

practice of specifying performance at a single sample

rate only, the ADC124S021 is fully specified over a

sample rate range of 50 ksps to 200 ksps. The

converter is based on a successive-approximation

register architecture with an internal track-and-hold

circuit. It can be configured to accept up to four input

signals at inputs IN1 through IN4.

The output serial data is straight binary, and is

compatible with several standards, such as SPI?,

QSPI?, MICROWIRE, and many common DSP serial interfaces.

The ADC124S021 operates with a single supply that

can range from +2.7V to +5.25V. Normal power

consumption using a +3V or +5V supply is 2.2 mW

and 7.9 mW, respectively. The power-down feature

reduces the power consumption to just 0.14 μW using a +3V supply, or 0.32 μW using a +5V supply.

The ADC124S021 is packaged in a 10-lead VSSOP

package. Operation over the industrial temperature

range of ?40°C to +85°C is ensured.