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Numéro de référence | ADC122S625 | ||
Description | Dual 12-Bit - 50 kSPS to 200 kSPS - Simultaneous Sampling A/D Converter | ||
Fabricant | National Semiconductor | ||
Logo | |||
1 Page
February 25, 2008
www.DataSheet4U.com
ADC122S625
Dual 12-Bit, 50 kSPS to 200 kSPS, Simultaneous Sampling
A/D Converter
General Description
The ADC122S625 is a dual 12-bit, 50 kSPS to 200 kSPS si-
multaneous sampling Analog-to-Digital (A/D) converter. The
analog inputs on both channels are sampled simultaneously
to preserve their relative phase information to each other. The
converter is based on a successive-approximation register
architecture where the differential nature of the analog inputs
is maintained from the internal track-and-hold circuits
throughout the A/D converter to provide excellent common-
mode signal rejection. The ADC122S625 features an external
reference that can be varied from 1.0V to VA.
The ADC122S625's serial data output is binary 2's comple-
ment and is compatible with several standards, such as
SPI™, QSPI™, MICROWIRE™, and many common DSP se-
rial interfaces. The serial clock (SCLK) and chip select bar
(CS) are shared by both channels.
Operating from a single 5V analog supply and a reference
voltage of 2.5V, the total power consumption while operating
at 200 kSPS is typically 8.6 mW. With the ADC122S625 op-
erating in power-down mode, the power consumption re-
duces to 2.6 µW. The differential input, low power consump-
tion, and small size make the ADC122S625 ideal for direct
connection to sensors in motor control applications.
Operation is guaranteed over the industrial temperature
range of −40°C to +105°C and clock rates of 1.6 MHz to 6.4
MHz. The ADC122S625 is available in a 10-lead MSOP pack-
age.
Features
■ True Simultaneous Sampling Differential Inputs
■ Guaranteed performance from 50 kSPS to 200 kSPS
■ External Reference
■ Wide Input Common-Mode Voltage Range
■ Single High-Speed Serial Data Output
■ Operating Temperature Range of −40°C to +105°C
■ SPI™/QSPI™/MICROWIRE™/DSP compatible Serial
Interface
Key Specifications
■ Conversion Rate
50 kSPS to 200 kSPS
■ INL
±1 LSB (max)
■ DNL
±0.95 LSB (max)
■ SNR
71 dBc (min)
■ THD
-72 dBc (min)
■ ENOB
11.25 bits (min)
■ Power Consumption at 200 kSPS
— Converting, VA = 5V, VREF = 2.5V 8.6 mW (typ)
— Power-Down, VA = 5V, VREF = 2.5V 2.6 µW (typ)
Applications
■ Motor Control
■ Power Meters/Monitors
■ Multi-Axis Positioning Systems
■ Instrumentation and Control Systems
■ Data Acquisition Systems
■ Medical Instruments
■ Direct Sensor Interface
Connection Diagram
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.
© 2008 National Semiconductor Corporation 300553
30055305
www.national.com
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Pages | Pages 20 | ||
Télécharger | [ ADC122S625 ] |
No | Description détaillée | Fabricant |
ADC122S625 | Dual 12-Bit - 50 kSPS to 200 kSPS - Simultaneous Sampling A/D Converter | National Semiconductor |
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