April 2005
ADC124S021
4 Channel, 200 kSPS, 12-Bit A/D Converter
General Description
Features
n Specified over a range of sample rates.
n Four input channels
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 speci-
fied 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.
n Variable power management
n Single power supply with 2.7V - 5.25V range
Key Specifications
n DNL
n INL
+0.4 / −0.2 LSB (typ)
0.35 LSB (typ)
n SNR
72.0 dB (typ)
The output serial data is straight binary, and is compatible
n Power Consumption
— 3V Supply
— 5V Supply
™
™
with several standards, such as SPI , QSPI , MICROW-
IRE, and many common DSP serial interfaces.
2.2 mW (typ)
7.9 mW (typ)
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, respec-
tively. The power-down feature reduces the power consump-
tion to just 0.14 µW using a +3V supply, or 0.32 µW using a
+5V supply.
Applications
n Portable Systems
n Remote Data Aquisitions
n Instrumentation and Control Systems
The ADC124S021 is packaged in a 10-lead MSOP package.
Operation over the industrial temperature range of −40˚C to
+85˚C is guaranteed.
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Resolution
Specified for Sample Rate Range of:
200 to 500 kSPS
50 to 200 kSPS
ADC124S021
ADC104S021
ADC084S021
500 kSPS to 1 MSPS
ADC124S101
12-bit
10-bit
8-bit
ADC124S051
ADC104S051
ADC104S101
ADC084S051
ADC084S101
Connection Diagram
20124305
TRI-STATE® is a trademark of National Semiconductor Corporation
™
™
QSPI and SPI are trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation
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