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April 2005 www.DataSheet4U.com
ADC124S021 4 Channel, 200 kSPS, 12-Bit A/D Converter
ADC124S021 4 Channel, 200 kSPS, 12-Bit A/D Converter
General Description
The ADC124S021 is a low-power, four-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 ADC124S021 is fully specified over a sample rate range of 50 kSPS to 200 kSPS. The converter is based on a successive-approximation register architecture with an internal track-and-hold circuit. It can be configured to accept up to four input signals at inputs IN1 through IN4. 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 ADC124S021 operates with a single supply that can range from +2.7V to +5.25V. Normal power consumption using 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 ADC124S021 is packaged in a 10-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. Four 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 +0.4 / −0.2 LSB (typ) ± 0.35 LSB (typ) 72.0 dB (typ) 2.2 mW (typ) 7.9 mW (typ)
Applications
n Portable Systems n Remote Data Aquisitions 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 ADC124S021 ADC104S021 ADC084S021 Specified for Sample Rate Range of: 200 to 500 kSPS ADC124S051 ADC104S051 ADC084S051 500 kSPS to 1 MSPS ADC124S101 ADC104S101 ADC084S101
Connection Diagram
20124305
TRI-STATE ® is a trademark of National Semiconductor Corporation QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation
DS201243
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ADC124S021
Ordering Information
Order Code ADC124S021CIMM ADC124S021CIMMX ADC124S021EVAL Temperature Range −40˚C to +85˚C −40˚C to +85˚C Description 10-Lead MSOP Package
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X21C X21C
10-Lead MSOP Package, Tape & Reel Evaluation Board
Block Diagram
20124307
Pin Descriptions and Equivalent Circuits
Pin No. ANALOG I/O 4-7 DIGITAL I/O 10 9 8 1 POWER SUPPLY 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 analog supply and signals. SCLK DOUT DIN CS 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. Digital data input. The ADC124S021’s Control Register is loaded through this pin on rising edges of the SCLK pin. Chip select. On the falling edge of CS, a conversion process begins. Conversions continue as long as CS is held low. IN1 to IN4 Analog inputs. These signals can range from 0V to VA. Symbol Description
2
VA
3
GND
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2
ADC124S021
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage VA Voltage on Any Pin to GND Input Current at Any Pin (Note 3) Package Input Current(Note 3) Power Consumption at TA = 25˚C ESD Susceptibility (Note 5) Human Body Model Machine Model Junction Temperature Storage Temperature −0.3V to 6.5V −0.3V to VA +0.3V
Operating Ratings (Notes 1, 2)
Operating Temperature Range VA Supply Voltage Digital Input Pins Voltage Range Clock Frequency Analog Input Voltage
www.DataSheet4U.com −40˚C ≤ TA ≤ +85˚C
+2.7V to +5.25V −0.3V to VA 0.8 MHz to 3.2 MHz 0V to VA
± 10 mA ± 20 mA
See (Note 4) 2500V 250V +150˚C −65˚C to +150˚C
Package Thermal Resistance
Package 10-lead MSOP θJA 190˚C / W
Soldering process must comply with National Semiconductor’s Reflow Temperature Profile specifications. Refer to www.national.com/packaging. (Note 6)
(Note 9) The following specifications apply for VA = +2.7V to 5.25V, GND = 0V, fSCLK = 0.8 MHz to 3.2 MHz, fSAMPLE = 50 kSPS to 200 kSPS, CL = 35 pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25˚C. Symbol Parameter Conditions Typical Limits (Note 7) 12 +0.35 −0.35 +0.4 −0.2 +0.37 +0.8 −1.1 +1.1 −0.8 Units
ADC124S021 Converter Electrical Characteristics
STATIC CONVERTER CHARACTERISTICS Resolution with No Missing Codes INL DNL VOFF OEM FSE FSEM Integral Non-Linearity Differential Non-Linearity Offset Error Channel to Channel Offset Error Match Full-Scale Error Channel to.