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PDF MAX496 Data sheet ( Hoja de datos )
| Número de pieza | MAX496 | |
| Descripción | 375MHz Quad Closed-Loop Video Buffers / AV = +1 and +2 | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX496 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-0373; Rev 1; 12/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
375MHz Quad Closed-Loop
Video Buffers, AV = +1 and +2
________________General Description
The MAX496 and MAX497 are quad, closed-loop, ±5V
video buffers that feature extremely high bandwidth and
slew rate for both component video (RGB or YUV) and
composite video (NTSC, PAL, SECAM). The MAX496 is
a unity-gain (0dB) buffer with a 375MHz -3dB bandwidth
and a 1600V/µs slew rate. The MAX497 gain of +2 (6dB)
buffer, optimized for driving back-terminated coaxial
cable, features a 275MHz -3dB bandwidth and a
1500V/µs slew rate. The MAX496/MAX497 are not slew-
rate limited, thus providing a high full-power bandwidth
of 230MHz and 215MHz, respectively.
The MAX496/MAX497 incorporate a unique two-stage
architecture that combines the low offset and noise
benefits of voltage feedback with the high bandwidth
and slew-rate advantages of current-mode-feedback.
________________________ Applications
Computer Workstations
Surveillance Video
Broadcast and High-Definition TV Systems
Multimedia Products
Medical Imaging
High-Speed Signal Processing
Video Switching and Routing
_______________Frequency Response
MAX497
SMALL-SIGNAL GAIN vs. FREQUENCY
9
8
7
6
5
4
3
2
1
0
-1
1M
10M 100M
FREQUENCY (Hz)
1G
____________________________Features
o MAX496 Fixed Gain: +1V/V
MAX497 Fixed Gain: +2V/V
o High Speed:
Small-Signal -3dB Bandwidth: 375MHz (MAX496)
275MHz (MAX497)
Full-Power -3dB Bandwidth: 230MHz (MAX496)
215MHz (MAX497)
o 0.1dB Gain Flatness: 65MHz (MAX496)
120MHz (MAX497)
o 1600V/µs Slew Rate (MAX496)
1500V/µs Slew Rate (MAX497)
o Fast Settling Time: 12ns to 0.1%
o Lowest Differential Phase/Gain Error: 0.01°/0.01%
o 2pF Input Capacitance
o 5.6nV/√Hz Input-Referred Voltage Noise
o Low Distortion: 64dBc (f = 10MHz)
o Directly Drives 50Ω or 75Ω Back-Terminated Cables
o High ESD Protection: 5000V
o Output Short-Circuit Protected
_______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX496CPE
0°C to +70°C
16 Plastic DIP
MAX496CSE
0°C to +70°C
16 Narrow SO
MAX496C/D
0°C to +70°C
Dice*
MAX497CPE
0°C to +70°C
16 Plastic DIP
MAX497CSE
0°C to +70°C
16 Narrow SO
MAX497C/D
0°C to +70°C
Dice*
* Dice are specified at TA = +25°C, DC parameters only.
___________________Pin Configuration
TOP VIEW
GND 1
IN0 2
GND 3
IN1 4
GND 5
IN2 6
GND 7
IN3 8
MAX496
MAX497
16 OUT0
15 VCC
14 OUT1
13 VEE
12 OUT2
11 VEE
10 OUT3
9 VCC
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
375MHz Quad Closed-Loop
Video Buffers, AV = +1 and +2
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
MAX496
CROSSTALK vs. FREQUENCY
-10
-20
-30
-40
-50 ALL-HOSTILE
-60
-70
-80
-90 ADJACENT CHANNEL
-100
-110
1
10 100 200
FREQUENCY (MHz)
MAX496
GAIN MATCH vs. FREQUENCY
0.3
0.2 CH 2–CH 0 CH 2–CH 1
0.1 CH 3–CH 1
0.0
-0.1
CH 3–CH 2
-0.2 CH 1–CH 0
-0.3
CH 3–CH 0
-0.4
-0.5
-0.6
-0.7
1M
10M 100M
FREQUENCY (Hz)
1G
MAX497
CROSSTALK vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1M
ADJACENT CHANNEL
ALL-HOSTILE
10M 100M
FREQUENCY (Hz)
1G
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
1M
MAX497
GAIN MATCH vs. FREQUENCY
CH 2–CH 0
CH 1–CH 0
CH 3–CH 1
CH 3–CH 0
CH 3–CH 2
CH 2–CH 1
10M 100M
FREQUENCY (Hz)
1G
POWER-SUPPLY REJECTION (PSR)
vs. FREQUENCY
-10
-20
-30
MAX497
-40
-50
-60
-70
-80
-90
-100
20k
MAX496
100k 1M 10M
FREQUENCY (Hz)
100M
1.000
0.999
0.998
0.997
0.996
0.995
0.994
0.993
0.992
0.991
0.990
-40
MAX496
GAIN vs. TEMPERATURE
VIN = -1.0V
VIN = -1.0V
-20 0 20 40 60 80
TEMPERATURE (°C)
100
MAX497
GAIN vs. TEMPERATURE
2.05
2.04
2.03
2.02
2.01 VIN = +1.0V
2.00
1.99
1.98 VIN = -1.0V
1.97
1.96
1.95
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0.30
0.20
0.10
0
-0.10
-0.20
-0.30
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
SUPPLY CURRENT
vs. TEMPERATURE
40
RL = NO LOAD
38
36
34 IEE
32
30 ICC
28
26
24
22
20
-10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
375MHz Quad Closed-Loop
Video Buffers, AV = +1 and +2
8
6 RL = 50Ω
4 RISO = 0Ω
2
CL = 60pF
CL = 22pF
CL = 47pF
CL = 10pF
0
-2 CL = 0pF
-4
-6
-8
-10
-12
1M
10M 100M
FREQUENCY (Hz)
1G
Figure 5a. MAX496 Small-Signal Gain vs. Frequency and Load
Capacitor (RL = 50Ω, RISO = 0Ω)
* -3dB ATTENUATION DUE
TO RISO NOT SHOWN
5
4 RL = 50Ω
3 RISO = 20Ω
2 CL = 22pF
1 CL = 10pF
0
-1 CL = 47pF
-2
-3 CL = 60pF
-4
-5
1M
10M 100M
FREQUENCY (Hz)
1G
Figure 5b. MAX496 Small-Signal Gain vs. Frequency and
Load Capacitor (RL = 50Ω, RISO = 20Ω)
20
15 RL =
10 RISO = 0Ω
CL = 68pF CL = 47pF
CL = 20pF
5
0
-5 CL = 10pF
-10
-15 CL = 0pF
-20
-25
-30
1M
10M 100M
FREQUENCY (Hz)
1G
Figure 5c. MAX496 Small-Signal Gain vs. Frequency and Load
Capacitor (RL = ∞, RISO = 0Ω)
20
15 RL =
10 RISO = 20Ω
5
CL = 47pF
0
-5 CL = 68pF
-10 CL = 22pF
-15
-20
-25
-30
1M
CL = 10pF
10M 100M
FREQUENCY (Hz)
1G
Figure 5d. MAX496 Small-Signal Gain vs. Frequency and
Load Capacitor (RL = ∞, RISO = 20Ω)
The MAX496/MAX497 drive capacitive loads up to 75pF
without sustained oscillation, although some peaking
may occur. When driving larger capacitive loads, or to
reduce peaking, add an isolation resistor (RISO) between
the output and the capacitive load (Figures 5a–5d).
Grounding and Layout
The MAX496/MAX497 bandwidths are in the RF fre-
quency range. Depending on the size of the PC board
used and the frequency of operation, it may be neces-
sary to use Micro-strip or Stripline techniques.
To realize the full AC performance of these high-speed
buffers, pay careful attention to power-supply bypassing
and board layout. The PC board should have at least two
layers (wire-wrap boards are too inductive, bread boards
are too capacitive), with one side a signal layer and the
other a large, low-impedance ground plane. With multilay-
er boards, locate the ground plane on the layer that is not
dedicated to a specific signal trace. The ground plane
should be as free from voids as possible. Connect all
ground pins to the ground plane.
Connect both positive power-supply pins together and
bypass with a 0.10µF ceramic capacitor at each power
supply pin, as close to the device as possible. Repeat
the same for the negative power-supply pins. The
capacitor lead lengths should be as short as possible
to minimize lead inductance; surface-mount chip
capacitors are ideal. A large-value (4.7µF or greater)
tantalum or electrolytic bypass capacitor on each sup-
ply may be required for high-current loads. The location
of this capacitor is not critical.
The MAX496/MAX497’s analog input pins are isolated
with ground pins to minimize parasitic coupling, which can
degrade crosstalk and/or amplifier stability. Keep signal
paths as short as possible to minimize inductance. Ensure
that all input channel traces are the same length to main-
tain the phase relationship between the four channels. To
further reduce crosstalk, connect the coaxial-cable shield
to the ground side of the 75Ω terminating resistor at the
ground plane, and terminate all unused inputs ground and
outputs with a 100Ω or 150Ω resistor to ground.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX496.PDF ] | |
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