ADC122S101 2 Channel, 1 MSPS 12-Bit A/D Converter
April 2005
ADC122S101
2 Channel, 1 MSPS 12-Bit A/D Converter
General Description
The ADC122S101 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 ADC122S101 is fully speci-
fied over a sample rate range of 500 kSPS to 1 MSPS. The
converter is based on a successive-approximation register
architecture 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
™
, MICROW-
IRE, and many common DSP serial interfaces.
The ADC122S101 operates with a single supply that can
range from +2.7V to +5.25V. Normal power consumption
using a +3V or +5V supply is 4.3 mW and 13.1 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 ADC122S101 is packaged in an 8-lead MSOP package.
Operation over the industrial temperature range of −40˚C to
+85˚C is guaranteed.
Features
n
n
n
n
Specified over a range of sample rates.
Two input channels
Variable power management
Single power supply with 2.7V - 5.25V range
Key Specifications
n
n
n
n
DNL
INL
SNR
Power Consumption
— 3V Supply
— 5V Supply
+0.9 / −0.6 LSB (typ)
±
0.64 LSB (typ)
72.4 dB (typ)
4.3 mW (typ)
13.1 mW (typ)
Applications
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.
Resolution
50 to 200 kSPS
12-bit
10-bit
8-bit
ADC122S021
ADC102S021
ADC082S021
Specified for Sample Rate Range of:
200 to 500 kSPS
ADC122S051
ADC102S051
ADC082S051
500 kSPS to 1 MSPS
ADC122S101
ADC102S101
ADC082S101
Connection Diagram
20125205
Ordering Information
Order Code
ADC122S101CIMM
ADC122S101CIMMX
ADC122S101EVAL
Temperature Range
−40˚C to +85˚C
−40˚C to +85˚C
Description
8-Lead MSOP Package
8-Lead MSOP Package, Tape & Reel
Evaluation Board
Top Mark
X24C
X24C
TRI-STATE
®
is a trademark of National Semiconductor Corporation
QSPI
™
and SPI
™
are trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation
DS201252
www.national.com
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
