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ADC121S021 Datasheet

12-Bit A/D Converter

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October 2005
ADC121S021
Single Channel, 200 ksps, 12-Bit A/D Converter
General Description
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-
and-hold circuit.
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.
Features
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
Key Specifications
n DNL
n INL
n SNR
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)
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
Specified for Sample Rate Range of:
50 to 200 kSPS
200 to 500 kSPS
500 kSPS to 1 MSPS
12-bit
ADC121S021
ADC121S051
ADC121S101
10-bit
ADC101S021
ADC101S051
ADC101S101
8-bit
ADC081S021
ADC081S051
ADC081S101
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Connection Diagram
Ordering Information
Order Code
ADC121S021CIMF
ADC121S021CIMFX
ADC121S021EVAL
Temperature Range
−40˚C to +85˚C
−40˚C to +85˚C
20145105
Description
6-Lead SOT-23 Package
6-Lead SOT-23 Package, Tape & Reel
SOT-23 Evaluation Board
Top Mark
X07C
X07C
TRI-STATE® is a trademark of National Semiconductor Corporation
QSPIand SPIare trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation DS201451
www.national.com


National Semiconductor Electronic Components Datasheet

ADC121S021 Datasheet

12-Bit A/D Converter

No Preview Available !

Block Diagram
20145107
Pin Descriptions and Equivalent Circuits
Pin No.
ANALOG I/O
3
DIGITAL I/O
4
Symbol
VIN
SCLK
5 SDATA
6 CS
POWER SUPPLY
1 VA
2 GND
Description
Analog inputs. This signal can range from 0V to VA.
Digital clock input. This clock directly controls the conversion and readout processes.
Digital data output. The output samples are clocked out of this pin on falling edges of
the SCLK pin.
Chip select. On the falling edge of CS, a conversion process begins.
Positive supply pin. This pin should be connected to a quiet +2.7V to +5.25V source
and bypassed to GND with a 1 µF capacitor and a 0.1 µF monolithic capacitor located
within 1 cm of the power pin.
The ground return for the supply and signals.
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www.national.com
2


Part Number ADC121S021
Description 12-Bit A/D Converter
Maker National Semiconductor
Total Page 14 Pages
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