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.