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CLC952PCASM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CLC952PCASM
Beschreibung CLC949ACQ
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 8 Seiten
CLC952PCASM Datasheet, Funktion
N
CLC952
12-bit, 41MSPS Monolithic A/D Converter
September 1997
General Description
The CLC952 is a complete monolithic 12-bit 41MSPS analog-to-
digital converter system. Fabricated from a 0.8µm BiCMOS
process, the CLC952’s on-chip features include a very
linear wideband track-and-hold, bandgap voltage reference and a
proprietary 12-bit multi-stage quantizer. The CLC952 has been
designed for wideband digital communications receivers and
features a 72dBc spurious-free dynamic range (SFDR) and 64dB
signal-to-noise ratio (SNR).
The CLC952 operates from a standard ±5V power supply and
features excellent noise isolation with its >60dB power-supply
rejection ratio (PSRR). All digital control functions and output
registers are TTL compatible. The CLC952AC operates over the
commercial temperature range (0°C to 70°C), and the CLC952AJ
operates over the industrial temperature range (-40°C to 85°C)
version. The CLC952 is available in a 28-pin SSOP that provides
an extremely small footprint for reduced board space. National
Semiconductor thoroughly tests each part to verify full
compliance with guaranteed specifications.
Features
s 41MSPS
s Wide dynamic range
SFDR: 72dBc
SNR: 64dB
s Low power dissipation: 660mW
s Ground centered,
DC-coupled analog input
s Excellent PSRR: >60dB
s Very small package: 28-pin SSOP
s Low cost
Applications
s Cellular base-stations
s Digital communications
s Infrared/CCD imaging
s IF sampling
s Electro-optics
s Instrumentation
s Medical imaging
s High definition video
CLC952
Block Diagram
Vin
© 1997 National Semiconductor Corporation
Printed in the U.S.A.
Offset
Adjust
VREF
Input
Amp
2.4V Voltage
Reference
T/H
Amplifier
12-bit Subranging
Quantizer
Timing
Generator
TTL Output
Buffer
D11 MSB
D0 LSB
ENCODE
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CLC952PCASM Datasheet, Funktion
CLC952 Typical Performance Characteristics (VCC = +5V, VEE = -5V)
SFDR & SNR vs. Input Frequency
85
75
SFDR
65
SNR
55
45
0.1
30.72MSPS
1 10
Input Frequency (MHz)
100
Two Tone Output Spectrum
0
40.96MSPS
-20
f1 = 19.49MHz
f2 = 19.9MHz
-40
-60
-80
-100
0
5 10 15
Frequency (MHz)
Physical Dimensions
20
28
E E1
INDEX MARK
1
D
e
15 R1
b1
Ac
c1
L1
DETAIL A
A
L
b
SECTION A – A
14 SEE DETAIL "A"
A2
A A1
b
Symbol
A
A1
A2
b
b1
c
c1
D
E
E1
e
L
L1
R1
Min Max
1.73
2.00
0.00
0.21
1.65
1.85
0.20
0.40
0.20
0.33
0.10
0.22
0.10
0.18
10.07
10.33
7.50
7.90
5.20
5.38
0.65 BSC
0.52
0.95
1.25 REF
0.09
Notes
2
2
Notes:
1. All dimensions are in millimeters
2. Dimensions D and E1 do not include mold protrusion. Allowable protrusion is 0.20mm per side.
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