Single Channel, 200 ksps, 12-Bit A/D Converter
The ADC121S021 is a low-power, single channel CMOS
12-bit analog-to-digital converter with a high-speed serial
interface. Unlike the conventional practice of specifying per-
formance at a single sample rate only, the ADC121S021 is
fully specified over a sample rate range of 50 kSPS to 200
kSPS. The converter is based upon a successive-
approximation register architecture with an internal track-
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 ADC121S021 operates with a single supply that can
range from +2.7V to +5.25V. Normal power consumption
using a +3V or +5V supply is 1.5 mW and 7.9 mW, respec-
tively. The power-down feature reduces the power consump-
tion to as low as 2.6 µW using a +5V supply.
The ADC121S021 is packaged in a 6-lead SOT-23 package.
Operation over the industrial temperature range of −40˚C to
+85˚C is guaranteed.
n Specified over a range of sample rates.
n 6-lead SOT-23 package
n Variable power management
n Single power supply with 2.7V - 5.25V range
n SPI™/QSPI™/MICROWIRE/DSP compatible
n Power Consumption
— 3V Supply
— 5V Supply
+0.45/-0.25 LSB (typ)
+0.45/-0.4 LSB (typ)
72.3 dB (typ)
1.5 mW (typ)
7.9 mW (typ)
n Portable Systems
n Remote Data Acquisition
n Instrumentation and Control Systems
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Specified for Sample Rate Range of:
50 to 200 kSPS
200 to 500 kSPS
500 kSPS to 1 MSPS
−40˚C to +85˚C
−40˚C to +85˚C
6-Lead SOT-23 Package
6-Lead SOT-23 Package, Tape & Reel
SOT-23 Evaluation Board
TRI-STATE® is a trademark of National Semiconductor Corporation
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation DS201451