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PDF CLC5957MTD Data sheet ( Hoja de datos )

Número de pieza CLC5957MTD
Descripción 12-bit/ 70MSPS Broadband Monolithic A/D Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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N
October 1999
CLC5957
12-bit, 70MSPS Broadband Monolithic A/D Converter
General Description
The CLC5957 is a monolithic 12-bit, 70MSPS analog-to-digital
converter. The device has been optimized for use in IF-sampled
digital receivers and other applications where high resolution,
high sampling rate, wide dynamic range, low power dissipation,
and compact size are required. The CLC5957 features differential
analog inputs, low jitter differential universal clock inputs, a low
distortion track-and-hold with 0-300MHz input bandwidth, a band-
gap voltage reference, data valid clock output, TTL compatible
CMOS (3.3V or 2.5V) programmable output logic, and a propri-
etary 12-bit multi-stage quantizer. The CLC5957 is fabricated on
the ABIC-V 0.8 micron BiCMOS process.
The CLC5957 features a 74dBc spurious free dynamic range
(SFDR) and a 67dB signal to noise ratio (SNR). The wideband
track-and-hold allows sampling of IF signals to greater than
250MHz. The part produces two-tone, dithered, SFDR of 83dBFS
at 75MHz input frequency. The differential analog input provides
excellent common mode rejection, while the differential universal
clock inputs minimize jitter. The 48-pin TSSOP package provides
an extremely small footprint for applications where space is a
critical consideration. The CLC5957 operates from a single +5V
power supply. Operation over the industrial temperature range of
-40°C to +85°C is guaranteed. National Semiconductor tests
each part to verify compliance with the guaranteed specifications.
Features
• 70MSPS
• Wide dynamic range
SFDR: 74dBc
SFDR w/dither: 85dBFS
SNR: 67dB
• IF sampling capability
• Input bandwidth = 0-300MHz
• Low power dissipation: 640mW
• Very small package: 48-pin TSSOP
• Single +5V supply
• Data valid clock output
• Programmable output levels:
3.3V or 2.5V
Applications
• Cellular base-stations
• Digital communications
• Infrared/CCD imaging
• IF sampling
• Electro-optics
• Instrumentation
• Medical imaging
• High definition video
ME79TG
N CL5C9559657
IMMTTDD
Actual Size
Clock
In
AIn T/H
ADC Block Diagram
DAV
3-bit
Q
3
3-bit
Q
3-bit
Q
33
Bit Align/Error Correct
3-bit
Q
3
12
ADC
Out
First IF Receiver
IF
Input
IF
Saw
~~
BPF
(150MHz
typ.)
DVGA
(G = 42dB)
Noise
BPF
3-bit (Gain Control)
CLC5957
12-bit
70MSPS
ADC
CLC5902
12
DAV
Dig.
Tuner/
Filter
AGC
20
Decimation/filter = 190/0.8
Output BW = 50M/190 X 0.8 = 210KHz
Single Tone Output Spectrum w/Dither
0
-10
Fin = 25.3MHZ
Fsample = 66MHz
-20
-30
-40
-50
-60
-70
-80
-90
-100
0 4 8 12 16 20 24 28 32
Frequency (MHz)
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
Receiver SINAD vs. Input Amplitude
90
80
70
60
50
40
30
20
10
0
-125 -100
-75
-50
-25
Input (dBFS)
0
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CLC5957MTD pdf
CLC5957 Typical Performance Characteristics (Vcc = +5V)
SNR and SFDR vs.
Input Amplitude (w/o Dither)
90
80
THD
70
60
50
SFDR
40
30
20
10
-50
SNR
Fin = 20MHz
Fs = 66MSPS
-40 -30 -20 -10
Input Amplitude (dBFS)
0
SNR and SFDR vs.
Input Amplitude (w/o Dither)
90
80
THD
70
60
50
SFDR
40
SNR
30
20
10
-50
Fin = 75MHz
Fs = 66MSPS
-40 -30 -20 -10
Input Amplitude (dBFS)
0
SNR and SFDR vs.
Input Amplitude (w/o Dither)
90
80
THD
70
SFDR
60
50
SNR
40
30
20
10
-50
Fin = 250MHz
Fs = 66MSPS
-40 -30 -20 -10
Input Amplitude (dBFS)
0
SNR and SFDR vs.
Input Amplitude (w/Dither)
90
THD
80
70
60
50
SFDR
SNR
40
30
20
10
-50
Fin = 20MHz
Fs = 66MSPS
-40 -30 -20 -10
Input Amplitude (dBFS)
0
SNR and SFDR vs.
Input Amplitude (w/o Dither)
90
80
THD
70
60
50
SFDR
40
SNR
30
20
10
-50
Fin = 150MHz
Fs = 66MSPS
-40 -30 -20 -10
Input Amplitude (dBFS)
0
Two Tone Output Spectrum (w/Dither)
0
-10
Fs = 66MSPS
F1 = 74.5MHz
-20 F2 = 75.5MHz
-30
-40
-50
-60 Dither Signal =
-70 300KHz @ -28dBFS
-80
-90
-100
0 5 10 15 20 25 30
Frequency (MHz)
Two Tone Output Spectrum (w/Dither)
0
-10
Fs = 66MSPS
F1 = 149.5MHz
-20 F2 = 150.5MHz
-30
-40
-50
-60 Dither Signal =
-70 300KHz @ -28dBFS
-80
-90
-100
0 5 10 15 20 25 30
Frequency (MHz)
Two Tone Output Spectrum (w/Dither)
0
-10
Fs = 66MSPS
F1 = 249.5MHz
-20 F2 = 251.5MHz
-30
-40
-50
-60 Dither Signal =
-70 500KHz @ -28dBFS
-80
-90
-100
0
5 10 15 20 25 30
Frequency (MHz)
5 http://www.national.com

5 Page





CLC5957MTD arduino
CLC5957 Evaluation Board Layout
CLC5957PCASM Layer 1
CLC5957PCASM Layer 2
CLC5957PCASM Layer 3
CLC5957PCASM Layer 4
11 http://www.national.com

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