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ADC122S021CIMM/NOPB 数据手册 - National Semiconductor（美国国家半导体）
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ADC122S021CIMM/NOPB数据手册
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ADC122S021
January 30, 2010
2 Channel, 50 ksps to 200 ksps 12-Bit A/D Converter
General Description
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 con-
verter is based on a successive-approximation register archi-
tecture with an internal track-and-hold circuit. It can be
configured to accept one or two input signals at inputs IN1
and IN2.
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 us-
ing 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
supply.
The ADC122S021 is packaged in an 8-lead MSOP package.
Operation over the industrial temperature range of −40°C to
+85°C is guaranteed.
Features
■
Specified over a range of sample rates.
■
Two input channels
■
Variable power management
■
Single power supply with 2.7V - 5.25V range
Key Specifications
■
DNL +0.4 / −0.2 LSB (typ)
■
INL ± 0.35 LSB (typ)
■
SNR 72.0 dB (typ)
■
Power Consumption
■
—
3V Supply 2.2 mW (typ)
—
5V Supply 7.9 mW (typ)
Applications
■
Portable Systems
■
Remote Data Acquisition
■
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 ADC122S021 ADC122S051 ADC122S101
10-bit ADC102S021 ADC102S051 ADC102S101
8-bit ADC082S021 ADC082S051 ADC082S101
Connection Diagram
20124605
Ordering Information
Order Code Temperature Range Description Top Mark
ADC122S021CIMM −40°C to +85°C 8-Lead MSOP Package X18C
ADC122S021CIMMX −40°C to +85°C 8-Lead MSOP Package, Tape & Reel X18C
ADC122S021EVAL Evaluation Board
TRI-STATE® is a trademark of National Semiconductor Corporation
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2010 National Semiconductor Corporation 201246 www.national.com
ADC122S021 2 Channel, 50 ksps to 200 ksps 12-Bit A/D Converter
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