National Semiconductor ADC121S021 Single Channel, 50 to 200 ksps, 12-Bit A/D Converter Owner's Manual - User Guide
Summary
The ADC121S021 is a high-speed, low-power 12-bit Analog-to-Digital Converter designed for demanding portable and industrial data acquisition systems. It operates over a flexible single supply range (2.7V–5.25V) and features variable performance from 50 to 200 ksps, compatible with major digital interfaces like SPI and QSPI. This technical guide details the unit's electrical characteristics, package options (LLP/SOT-23), and suitability for instrumentation and control applications requiring reliability across industrial temperature ranges.
Manual Details
| Brand | National |
|---|---|
| Pages | 15 |
| File Size | 712.69 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What are the operating sample rate specifications?
The ADC121S021 operates over a sample rate range of 50 ksps to 200 ksps.
How does the device handle power management?
Using the power-down feature, the power consumption can be reduced to as low as 2.6 µW with a +5.25V supply.
What data interfaces are compatible with the output?
The serial data is compatible with standards including SPI, QSPI, MICROWIRE, and common DSP interfaces.
What is the guaranteed operating temperature range?
Operation is guaranteed over the industrial temperature range of −40˚C to +85˚C.