ADC12D040CIVS National Semiconductor, ADC12D040CIVS Datasheet

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ADC12D040CIVS

Manufacturer Part Number
ADC12D040CIVS
Description
DUAL 12BIT ADC, 40MSPS, SMD, 12D040
Manufacturer
National Semiconductor
Datasheet

Specifications of ADC12D040CIVS

Resolution (bits)
12bit
Input Channel Type
Differential
Data Interface
Parallel
Supply Voltage Range - Analogue
4.75V To 5.25V
Supply Voltage Range - Digital
2.35V To 5.25V, 4.75V To 5.25V
Sampling Rate
40MSPS
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2003 National Semiconductor Corporation
ADC12D040
Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with
Internal/External Reference
General Description
The ADC12D040 is a dual, low power monolithic CMOS
analog-to-digital converter capable of converting analog in-
put signals into 12-bit digital words at 40 Megasamples per
second (MSPS), minimum. This converter uses a differential,
pipeline architecture with digital error correction and an on-
chip sample-and-hold circuit to minimize die size and power
consumption while providing excellent dynamic perfor-
mance. Operating on a single 5V power supply, the
ADC12D040 achieves 10.9 effective bits at 10 MHz input
and consumes just 600 mW at 40 MSPS, including the
reference current. The Power Down feature reduces power
consumption to 75 mW.
The differential inputs provide a full scale differential input
swing equal to 2V
input. Full use of the differential input is recommended for
optimum performance. The digital outputs for the two ADCs
are available on separate 12-bit buses with an output data
format choice of offset binary or 2’s complement.
For ease of interface, the digital output driver power pins of
the ADC12D040 can be connected to a separate supply
voltage in the range of 2.4V to the digital supply voltage,
making the outputs compatible with low voltage systems.
The ADC12D040’s speed, resolution and single supply op-
eration make it well suited for a variety of applications.
This device is available in the 64-lead TQFP package and
will operate over the industrial temperature range of −40˚C to
+85˚C.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
REF
with the possibility of a single-ended
DS200460
Features
n Binary/2’s complement output format
n Single supply operation
n Internal sample-and-hold
n Outputs 2.4V to 5V compatible
n TTL/CMOS compatible inputs/outputs
n Power down mode
n On-chip reference buffer
n Internal/External Reference
Key Specifications
n Resolution
n Conversion Rate
n SNR (f
n ENOB (f
n SFDR (f
n Crosstalk
n Data Latency
n Supply Voltage
n Power Consumption, Operating
Applications
n Ultrasound and Imaging
n Instrumentation
n Communications Receivers
n Sonar/Radar
n xDSL
n Cable Modems
n DSP Front Ends
IN
IN
IN
= 10 MHz)
= 10 MHz)
= 10 MHz)
November 2003
40 MSPS (min)
6 Clock Cycles
10.9 bits (typ)
600 mW (typ)
www.national.com
68 dB (typ)
80 dB (typ)
80 dB (typ)
+5V
12 Bits
±
5%

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ADC12D040CIVS Summary of contents

Page 1

... This device is available in the 64-lead TQFP package and will operate over the industrial temperature range of −40˚C to +85˚C. TRI-STATE ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation Features n Binary/2’s complement output format n Single supply operation n Internal sample-and-hold n Outputs 2 ...

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... Connection Diagram Ordering Information Industrial (−40˚C ≤ T ADC12D040CIVS ADC12D040CIVSX ADC12D040EVAL www.national.com ≤ +85˚C) Package A 64 Pin TQFP 64 Pin TQFP Tape and Reel Evaluation Board 2 20046001 ...

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Block Diagram 3 20046002 www.national.com ...

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Pin Descriptions and Equivalent Circuits Pin No. Symbol ANALOG I A− B− REF 11 INT/EXT REF ...

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Pin Descriptions and Equivalent Circuits Pin No. Symbol 24–29 DA0–DA11 34–39 42–47 DB0–DB11 52–57 ANALOG POWER 9, 18 10, 17, 20, 61, AGND 64 DIGITAL POWER 33 32, 49 DGND ...

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... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications – Voltage on Any Input or Output Pin Input Current at Any Pin (Note 3) Package Input Current (Note 3) Package Dissipation 25˚C A ESD Susceptibility ...

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Converter Electrical Characteristics Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V 0V, INT/EXT = +2.0V, OEA, OEB = 0V REF ...

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DC and Logic Electrical Characteristics Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, V +3.0V 0V, INT/EXT = REF apply for ...

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AC Electrical Characteristics input voltage must be ≤4.85V to ensure accurate conversions. Note 8: To guarantee accuracy required that |V Note 9: With the test condition for V = +2.0V (4V REF Note 10: Typical figures are at ...

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Specification Definitions APERTURE DELAY is the time after the rising edge of the clock to when the input signal is acquired or held for conver- sion. APERTURE JITTER (APERTURE UNCERTAINTY) is the variation in aperture delay from sample to sample. ...

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Timing Diagram Transfer Characteristic Output Timing 20046010 FIGURE 1. Transfer Characteristic 11 20046009 www.national.com ...

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Typical Performance Characteristics otherwise stated @ Spectral Response Fin = 9.95 MHz MHz CLK Crosstalk Response Fin = 9.95 MHz MHz, F CROSSTALK INL www.national.com 5V IMD ...

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Typical Performance Characteristics otherwise stated (Continued) INL & DNL vs. Temperature DNL & INL vs. Clock Duty Cycle SNR, SINAD, SFDR vs. Supply Voltage 5V 3V DNL & INL vs. ...

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Typical Performance Characteristics otherwise stated (Continued) SNR, SINAD, SFDR vs. Clock Frequency SNR, SINAD, SFDR vs. Reference Voltage Distortion vs. Supply Voltage www.national.com 5V 3V SNR, SINAD, SFDR vs. Clock ...

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Typical Performance Characteristics otherwise stated (Continued) Distortion vs. Clock Frequency Distortion vs. Reference Voltage Power Consumption vs. Reference Voltage 5V 3V Distortion vs. Clock Duty Cycle 20046046 Distortion vs. Temperature ...

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Functional Description Operating on a single +5V supply, the ADC12D040 uses a pipeline architecture and has error correction circuitry to help ensure maximum performance. The differential analog input signal is digitized to 12 bits. The reference input is buffered to ...

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Applications Information FIGURE 3. Angular Errors Between the Two Input Signals Will Reduce the Output Level or Cause Distortion TABLE 1. Input to Output Relationship — Differential Input V V Binary Output − V − ...

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Applications Information FIGURE 4. Application Circuit using Transformer or Differential Op-Amp Drive Circuit www.national.com (Continued) 18 20046013 ...

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Applications Information FIGURE 5. Differential Drive Circuit of Figure 4 TABLE 3. Resistor Values for Circuit of Figure 5 SIGNAL RANGE 0 - 0.25V 140Ω 768Ω 226Ω 0.5V 255Ω 768Ω 976Ω 1.0V 464Ω ...

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Applications Information 2.2 OEA, OEB The OEA or OEB pin, when high, puts the output pins into a high impedance state. When this pin is low the outputs are in the active state. The ADC12D040 will continue to convert whether ...

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Applications Information other lines can introduce jitter into the clock line, which can lead to degradation of SNR. Also, the high speed clock can introduce noise into the analog chain. Be especially careful with the layout of inductors. Mutual inductance ...

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Applications Information FIGURE 7. Isolating the ADC Clock from other Circuitry with a Clock Tree 7.0 COMMON APPLICATION PITFALLS Driving the inputs (analog or digital) beyond the power supply rails. For proper operation, all inputs should not go more than ...

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... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted 64-Lead TQFP Package Ordering Number ADC12D040CIVS NS Package Number VECO64A 2. A critical component is any component of a life ...

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