Rainbow-electronics ADC12D040 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics ADC12D040. Rainbow Electronics ADC12D040 User Manual Manual do Utilizador

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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
REF
with the possibility of a single-ended
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.
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 12 Bits
n Conversion Rate 40 MSPS (min)
n SNR (f
IN
= 10 MHz) 68 dB (typ)
n ENOB (f
IN
= 10 MHz) 10.9 bits (typ)
n SFDR (f
IN
= 10 MHz) 80 dB (typ)
n Crosstalk 80 dB (typ)
n Data Latency 6 Clock Cycles
n Supply Voltage +5V
±
5%
n Power Consumption, Operating 600 mW (typ)
Applications
n Ultrasound and Imaging
n Instrumentation
n Communications Receivers
n Sonar/Radar
n xDSL
n Cable Modems
n DSP Front Ends
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
November 2003
ADC12D040 Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with Internal/External Reference
© 2003 National Semiconductor Corporation DS200460 www.national.com
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Resumo do Conteúdo

Página 1 - Internal/External Reference

ADC12D040Dual 12-Bit, 40 MSPS, 600 mW A/D Converter withInternal/External ReferenceGeneral DescriptionThe ADC12D040 is a dual, low power monolithic CM

Página 2 - Ordering Information

Specification DefinitionsAPERTURE DELAY is the time after the rising edge of theclock to when the input signal is acquired or held for conver-sion.APE

Página 3 - Block Diagram

Timing Diagram20046009Output TimingTransfer Characteristic20046010FIGURE 1. Transfer CharacteristicADC12D040www.national.com11

Página 4

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise statedSpectral Response@Fin = 9.95 MHz,FCLK=40MHzIMD

Página 5

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)INL & DNL vs. Temperature DNL

Página 6

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)SNR, SINAD, SFDR vs. Clock Frequen

Página 7

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)Distortion vs. Clock Frequency Dis

Página 8 - AC Electrical Characteristics

Functional DescriptionOperating on a single +5V supply, the ADC12D040 uses apipeline architecture and has error correction circuitry to helpensure max

Página 9

Applications Information (Continued)TABLE 1. Input to Output Relationship —Differential InputVIN+VIN−Binary Output2’s ComplementOutputVCM−VREF/2VCM+VR

Página 10 - Specification Definitions

Applications Information (Continued)20046013FIGURE 4. Application Circuit using Transformer or Differential Op-Amp Drive CircuitADC12D040www.national.

Página 11 - Transfer Characteristic

Applications Information (Continued)TABLE 3. Resistor Values for Circuit of Figure 5SIGNALRANGER1 R2 R3 R4 R5, R60 - 0.25V 140Ω 768Ω 226Ω 412Ω 2000Ω0

Página 12

Connection Diagram20046001Ordering InformationIndustrial (−40˚C ≤ TA≤ +85˚C) PackageADC12D040CIVS 64 Pin TQFPADC12D040CIVSX 64 Pin TQFP Tape and ReelA

Página 13

Applications Information (Continued)2.2 OEA, OEBThe OEA or OEB pin, when high, puts the output pins into ahigh impedance state. When this pin is low t

Página 14

Applications Information (Continued)other lines can introduce jitter into the clock line, which canlead to degradation of SNR. Also, the high speed cl

Página 15

Applications Information (Continued)7.0 COMMON APPLICATION PITFALLSDriving the inputs (analog or digital) beyond the powersupply rails. For proper ope

Página 16 - Applications Information

Physical Dimensions inches (millimeters) unless otherwise noted64-Lead TQFP PackageOrdering Number ADC12D040CIVSNS Package Number VECO64ALIFE SUPPORT

Página 17

Block Diagram20046002ADC12D040www.national.com3

Página 18

Pin Descriptions and Equivalent CircuitsPin No. Symbol Equivalent Circuit DescriptionANALOG I/O152VINA+VINB+Non-Inverting analog signal Inputs. With a

Página 19

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description24–2934–39DA0–DA11Digital data output pins that make

Página 20

Absolute Maximum Ratings (Notes 1,2)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distri

Página 21

Converter Electrical Characteristics (Continued)Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VAVD+5V,

Página 22

DC and Logic Electrical Characteristics (Continued)Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VA=VD

Página 23 - NS Package Number VECO64A

AC Electrical Characteristics (Continued)input voltage must be ≤4.85V to ensure accurate conversions.20046007Note 8: To guarantee accuracy, it is requ

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