ADC124S021
4 Channel, 200 kSPS, 12-Bit A/D Converter
General 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 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.
The output serial data is straight binary, and is compatible
with several standards, such as SPI™, QSPI™, MICROW-
IRE, 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, 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.
The ADC124S021 is packaged in a 10-lead MSOP package.
Operation over the industrial temperature range of −40˚C to
+85˚C is guaranteed.
Features
n Specified over a range of sample rates.
n Four input channels
n Variable power management
n Single power supply with 2.7V - 5.25V range
Key Specifications
n DNL +0.4 / −0.2 LSB (typ)
n INL ± 0.35 LSB (typ)
n SNR 72.0 dB (typ)
n Power Consumption
— 3V Supply 2.2 mW (typ)
— 5V Supply 7.9 mW (typ)
Applications
n Portable Systems
n Remote Data Aquisitions
n Instrumentation and Control Systems
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Resolution Specified for Sample Rate Range of:
50 to 200 kSPS 200 to 500 kSPS 500 kSPS to 1 MSPS
12-bit ADC124S021 ADC124S051 ADC124S101
10-bit ADC104S021 ADC104S051 ADC104S101
8-bit ADC084S021 ADC084S051 ADC084S101
Connection Diagram
20124305
TRI-STATE
®
is a trademark of National Semiconductor Corporation
QSPI™ and SPI™ are trademarks of Motorola, Inc.
April 2005
ADC124S021
4
Channel,
200
kSPS,
12-Bit
A/D
Converter
© 2005 National Semiconductor Corporation DS201243 www.national.com