The ADC122S021 is a low-power, two-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 ADC122S021 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 one or two input signals at inputs IN1 and
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 ADC122S021 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
The ADC122S021 is packaged in an 8-lead VSSSOP package. Operation over the industrial
temperature range of −40°C to +85°C is ensured.
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