ADC121S705 Datasheet, PDF (1/22 Pages) Texas Instruments – 12-Bit, 500 kSPS to 1 MSPS, Differential Input, Micro Power A/D Converter

December 2006
ADC121S705
12-Bit, 500 kSPS to 1 MSPS, Differential Input, Micro Power
A/D Converter
General Description
The ADC121S705 is a 12-bit, 500 kSPS to 1 MSPS sampling
Analog-to-Digital (A/D) converter that features a fully differ-
ential, high impedance analog input and an external refer-
ence. The reference voltage can be varied from 1.0V to V_A,
with a corresponding resolution between 244µV and V_A di-
vided by 4096.
The output serial data is binary 2's complement and is com-
patible with several standards, such as SPI™, QSPI™, MI-
CROWIRE™, and many common DSP serial interfaces. The
differential input, low power consumption, and small size
make the ADC121S705 ideal for direct connection to trans-
ducers in battery operated systems or remote data acquisition
applications.
Operating from a single 5V supply, the supply current when
operating at 1 MSPS is typically 2.3 mA. The supply current
drops down to 0.3 µA typically when the ADC121S705 enters
power-down mode. The ADC121S705 is available in the
MSOP-8 package. Operation is guaranteed over the indus-
trial temperature range of −40°C to +105°C and clock rates
of 8 MHz to 16 MHz.
Features
■ ^{True Differential Inputs}
■ ^{Guaranteed performance from 500 kSPS to 1 MSPS}
■ ^{External Reference}
■ ^{Wide Input Common-Mode Voltage Range}
■ ^{SPI™/QSPI™/MICROWIRE™/DSP compatible Serial}
Interface
Key Specifications
■ ^{Conversion Rate}
■ ^INL
■ ^DNL
■ ^{Offset Error}
■ ^{Gain Error}
■ ^SINAD
■ ^{Power Consumption at V}_A ^{= 5V}
■ — ^{Active, 1 MSPS}
— Active, 500 kSPS
— Power-Down
500 kSPS to 1 MSPS
± 0.95 LSB (max)
± 0.95 LSB (max)
± 3.0 LSB (max)
± 6.5 LSB (max)
69.5 dB (min)
11.5 mW (typ)
9.0 mW (typ)
1.5 µW (typ)
Applications
■ ^{Automotive Navigation}
■ ^{Portable Systems}
■ ^{Medical Instruments}
■ ^{Instrumentation and Control Systems}
■ ^{Motor Control}
■ ^{Direct Sensor Interface}
Connection Diagram
20186705
Ordering Information
Order Code
ADC121S705CIMM
ADC121S705CIMMX
ADC121S705EB
Temperature Range
−40°C to +105°C
−40°C to +105°C
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2007 National Semiconductor Corporation 201867
Description
8-Lead MSOP Package, 1000 Units Tape & Reel
8-Lead MSOP Package, 3500 Units Tape & Reel
Evaluation Board
Top Mark
X1AC
X1AC
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