MAX4090AAXT+ [MAXIM]
Video Amplifier;
| 型号： | MAX4090AAXT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Video Amplifier 放大器 商用集成电路 |
| 文件： | 总17页 (文件大小：1635K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
General Description
Features
● Single-Supply Operation from 2.7V to 5.5V
The MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp, and low-power shutdown mode is available in
tiny SOT23, SC70, and µDFN packages. The MAX4090
is designed to drive DC-coupled, 150Ω back-terminated
video loads in portable video applications such as digi-
tal still cams, portable DVD players, digital camcorders,
PDAs, video-enabled cell phones, portable game sys-
tems, and notebook computers. The input clamp positions
the video waveform at the output and allows the MAX4090
to be used as a DC-coupled output driver.
● Input Sync-Tip Clamp
● DC-Coupled Output
● Low-Power Shutdown Mode Reduces Supply Current
to 150nA
● Available in Space-Saving SOT23, SC70, and µDFN
Packages
Ordering Information
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current to
150nA, making the MAX4090 ideal for low-voltage, bat-
tery-powered video applications.
PIN-
TOP
PART
TEMP RANGE
PACKAGE MARK
MAX4090EXT-T
MAX4090EUT-T
MAX4090ELT-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 SC70
6 SOT23
6 µDFN
ABM
ABOX
AAI
The MAX4090 is available in tiny 6-pin SOT23, SC70,
and µDFN packages and is specified over the extended
(-40°C to +85°C) and automotive (-40°C to +125°C)
temperature ranges.
MAX4090AAXT-T -40°C to +125°C 6 SC70
MAX4090AAUT-T -40°C to +125°C 6 SOT23
ACW
ABWQ
AAN
MAX4090AALT-T
-40°C to +125°C 6 µDFN
Applications
● Portable Video/Game Systems/DVD Players
● Digital Camcorders/Televisions/Still Cameras
● PDAs
● Video-Enabled Cell Phones
● Notebook Computers
● Portable/Flat-Panel Displays
Pin Configurations
Block Diagram
V
CC
TOP VIEW
MAX4090
FB
6
SHDN
OUT
4
IN
5
OUT
GND
IN
1
2
3
6
5
4
FB
OUT
FB
2.3kΩ
780Ω
CLAMP
MAX4090
SHDN
MAX4090
580Ω
1.2kΩ
V
CC
SHDN
1
2
3
SC70/SOT23
V
GND
IN
CC
µDFN
GND
19-2813; Rev 5; 4/15
MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Absolute Maximum Ratings
V
to GND ........................................................... -0.3V to +6V
6-Pin µDFN (derate 3.6mW/°C above +70°C) ............290mW
Operating Temperature Range
CC
OUT, FB, SHDN to GND ......................... -0.3V to (V
IN to GND (Note 1) ............................... VCLP to (V
+ 0.3V)
+ 0.3V)
CC
MAX4090E...................................................... -40°C to +85°C
MAX4090A.................................................... -40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
CC
IN Short-Circuit Duration from -0.3V to V
..................... 1min
CLP
Output Short-Circuit Duration to V
or GND ........ Continuous
CC
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C) .........695mW
6-Pin SC70 (derate 3.1mW/°C above +70°C) ............245mW
Note 1: V
is the input clamp voltage as defined in the DC Electrical Characteristics table.
CLP
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
(V
= 3.0V, V
= 0V, C = 0.1µF from IN to GND, R = infinity to GND, FB shorted to OUT, V
= 3.0V, T = -40°C to +85°C
CC
GND
IN
L
SHDN A
(MAX4090E), T = -40°C to +125°C (MAX4090A). Typical values are at T = +25°C, unless otherwise noted.) (Note 2)
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
10
UNITS
Supply Voltage Range
V
Guaranteed by PSRR
2.7
V
CC
V
V
= 3V
= 5V
6.5
6.5
CC
Quiescent Supply Current
I
mA
V
V
= V
CC
IN
CLP
= 0V
10
CC
Shutdown Supply Current
Input Clamp Voltage
Input Voltage Range
Input Bias Current
I
0.15
0.38
1
µA
V
SHDN
SHDN
V
Input referred
Inferred from voltage gain (Note 3)
0.27
0.47
1.45
35
CLP
V
V
V
IN
CLP
I
V
V
= 1.45V
22.5
3
µA
MΩ
V/V
dB
BIAS
IN
Input Resistance
+ 0.5V < V < V
+ 1V
CLP
IN
CLP
Voltage Gain
A
R = 150Ω, 0.5V < V < 1.45V (Note 4)
1.9
60
2
2.1
V
L
IN
Power-Supply Rejection Ratio
PSRR
2.7V < V
< 5.5V
80
2.7
4.6
CC
V
V
= 3V
= 5V
2.55
4.3
CC
Output-Voltage High Swing
Output-Voltage Low Swing
Output Current
V
R = 150Ω to GND
V
V
OH
L
CC
V
R = 150Ω to GND
V
0.47
OL
L
CLP
Sourcing, R = 20Ω to GND
45
40
85
L
I
mA
OUT
Sinking, R = 20Ω to V
85
L
CC
Output Short-Circuit Current
SHDN Logic-Low Threshold
SHDN Logic-High Threshold
SHDN Input Current
I
OUT shorted to V
or GND
110
mA
V
SC
CC
V
V
x 0.3
IL
CC
V
V
x 0.7
V
IH
IH
CC
I
0.003
4
1
µA
At DC
R
OUT
Shutdown Output Impedance
V
= 0V
kΩ
At 3.58MHz or
4.43MHz
SHDN
2
(Disabled)
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
AC Electrical Characteristics
(V
= 3.0V, V
= 0V, FB shorted to OUT, C = 0.1µF, R = 75Ω to GND, R = 150Ω to GND, V
= V , T = +25°C, unless
CC
GND
IN
IN
L
SHDN CC A
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MHz
MHz
MHz
MHz
V/µs
ns
Small-Signal -3dB Bandwidth
Large-Signal -3dB Bandwidth
BW
BW
V
V
V
V
V
V
= 100mV
55
45
25
17
275
25
50
2.5
1
SS
OUT
OUT
OUT
OUT
OUT
OUT
P-P
= 2V
LS
P-P
Small-Signal 0.1dB Gain Flatness BW
Large-Signal 0.1dB Gain Flatness BW
Slew Rate
= 100mV
= 2V
0.1dBSS
P-P
0.1dBLS
SR
P-P
= 2V step
= 2V step
Settling Time to 0.1%
t
S
Power-Supply Rejection Ratio
Output Impedance
PSRR
f = 100kHz
f = 5MHz
dB
Z
Ω
OUT
V
V
V
V
= 3V
= 5V
= 3V
= 5V
CC
CC
CC
CC
Differential Gain
DG
DP
NTSC
NTSC
%
0.5
0.8
0.5
20
65
2
Differential Phase
Degrees
Group Delay
D/dT
SNR
f = 3.58MHz or 4.43MHz
ns
dB
%
Peak Signal to RMS Noise
Droop
V
= 1V , 10MHz BW
P-P
IN
C
= 0.1µF (Note 4)
3
IN
V
= V
+ 1V, V
= 3V, V
OUT
IN
CLP
SHDN
SHDN Enable Time
t
250
50
ns
ns
ON
settled to within 1% of the final voltage
V
= V
+ 1V, V
= 0V, V
IN
CLP
SHDN OUT
SHDN Disable Time
t
OFF
settled to below 1% of the output voltage
Note 2: All devices are 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.
A
Note 3: Voltage gain (A ) is referenced to the clamp voltage, i.e., an input voltage of V = V
+ VI would produce an output volt-
V
IN
CLP
age of V
= V
+ A x VI.
OUT
CLP V
Note 4: Droop is guaranteed by the Input Bias Current specification.
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Operating Characteristics
(V
= 3.0V, GND = 0V, FB shorted to OUT, C = 0.1µF, R = 75Ω to GND, R = 150Ω to GND, SHDN = V , T = +25°C, unless
IN IN L CC A
CC
otherwise noted.)
SMALL-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
3
2
0.3
0.2
3
2
1
0.1
1
0
0
0
-1
-2
-3
-4
-5
-6
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-1
-2
-3
-4
-5
-6
A
V
V
= 2
A
V
V
= 2
A
V
V
= 2
= 5V
CC
= 100mV
OUT P-P
V
V
V
= 3V
= 3V
CC
CC
= 100mV
= 100mV
OUT
P-P
OUT
P-P
100k
1M
10M
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
0.3
0.2
3
2
0.3
0.2
0.1
1
0.1
0
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-1
-2
-3
-4
-5
-6
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
A
V
V
= 2
A
V
V
= 2
A
V
V
= 2
= 3V
CC
= 2V
OUT P-P
V
V
V
= 5V
= 3V
CC
CC
= 100mV
= 2V
OUT
P-P
OUT
P-P
100k
1M
10M
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
3
2
0.3
0.2
0
-10
-20
-30
-40
-50
-60
-70
-80
V
= 3V
CC
1
0.1
0
0
-1
-2
-3
-4
-5
-6
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
A
V
V
= 2
A
V
V
= 2
= 5V
CC
V
V
= 5V
CC
= 2V
= 2V
OUT
P-P
OUT
P-P
100k
1M
10M
100M
100k
1M
10M
100M
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Operating Characteristics (continued)
(V
= 3.0V, GND = 0V, FB shorted to OUT, C = 0.1µF, R = 75Ω to GND, R = 150Ω to GND, SHDN = V , T = +25°C, unless
IN IN L CC A
CC
otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
CLAMP VOLTAGE
vs. TEMPERATURE
0
-10
-20
-30
-40
-50
-60
-70
-80
6.8
6.7
6.6
6.5
6.4
6.3
6.2
6.1
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
V
= 5V
CC
V
= 5V
CC
V
= 3V
CC
20
60
10k
100k
1M
10M
100M
-40 -20
0
40
80 100 120 140
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
FREQUENCY (Hz)
TEMPERATURE (°C)
VOLTAGE GAIN
vs. TEMPERATURE
OUTPUT-VOLTAGE HIGH SWING
vs. TEMPERATURE
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
2.10
2.05
2.00
1.95
V
= 3V
CC
1.90
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
OUTPUT-VOLTAGE HIGH SWING
vs. TEMPERATURE
LARGE-SIGNAL PULSE RESPONSE
MAX4090 toc16
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
V
= 5V
CC
V
IN
500mV/div
V
OUT
1V/div
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (°C)
10ns/div
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Typical Operating Characteristics (continued)
(V
= 3.0V, GND = 0V, FB shorted to OUT, C = 0.1µF, R = 75Ω to GND, R = 150Ω to GND, SHDN = V , T = +25°C, unless
CC
IN
IN
L
CC
A
otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE
DIFFERENTIAL GAIN AND PHASE
MAX4090 toc17
2.0
1.0
0
V
IN
25mV/div
-1.0
-2.0
0
1
2
3
4
5
6
1.0
0.5
0
V
OUT
50mV/div
-0.5
-1.0
0
1
2
3
4
5
6
10ns/div
Pin Description
Typical Application Circuit
PIN
NAME
FUNCTION
SOT23/
SC70
V
CC
µDFN
1
2
3
4
2
3
OUT
GND
IN
Video Output
MAX4090
Ground
IN
Video Input
OUT
R
IN
Power-Supply Voltage. Bypass
with a 0.1µF capacitor to
ground as close to pin as
possible.
R
CLAMP
L
4
1
V
CC
FB
Shutdown. Pull SHDN low to
place the MAX4090 in low-
power shutdown mode.
5
6
5
6
SHDN
SHDN
FB
Feedback. Connect to OUT.
GND
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
The active sync-tip clamp also requires that the input
impedance seen by the input capacitor be less than
Detailed Description
The MAX4090 3V/5V, 6dB video buffer with sync-tip
clamp and low-power shutdown mode is available in tiny
SOT23 and SC70 packages. The MAX4090 is designed
to drive DC-coupled, 150Ω back-terminated video loads in
portable video applications such as digital still cams, por-
table DVD players, digital camcorders, PDAs, video-en-
abled cell phones, portable game systems, and notebook
computers. The input clamp positions the video waveform
at the output and allows the MAX4090 to be used as a
DC-coupled output driver.
100Ω typically to function properly. This is easily met
by the 75Ω input resistor prior to the input-coupling
capacitor and the back termination from a prior stage.
Insufficient input resistance to ground causes the
MAX4090 to appear to oscillate. Never operate the
MAX4090 in this mode.
Using the MAX4090 with the
Reconstruction Filter
In most video applications, the video signal generated
from the DAC requires a reconstruction filter to smooth
out the signal and attenuate the sampling aliases. The
MAX4090 is a direct DC-coupled output driver, which
can be used after the reconstruction filter to drive the
video signal. The driving load from the video DAC can
be varied from 75Ω to 300Ω. A low input impedance
(<100Ω) is required by the MAX4090 in normal operation,
special care must be taken when a reconstruction filter is
used in front of the MAX4090.
The MAX4090 operates from a single 2.7V to 5.5V sup-
ply and consumes only 6.5mA of supply current. The
low-power shutdown mode reduces the supply current to
150nA, making the MAX4090 ideal for low-voltage, bat-
tery-powered video applications.
The input signal to the MAX4090 is AC-coupled through
a capacitor into an active sync-tip clamp circuit, which
places the minimum of the video signal at approximately
0.38V. The output buffer amplifies the video signal while
still maintaining the 0.38V clamp voltage at the output.
For standard video signal, the video passband is about
6MHz and the system oversampling frequency is at
27MHz. Normally, a 9MHz BW lowpass filter can be
used for the reconstruction filter. This section demon-
strates the methods to build simple 2nd- and 3rd-order
passive butterworth lowpass filters at the 9MHz cutoff
frequency and the techniques to use them with the
MAX4090 (Figures 1 and 4).
For example, if V = 0.38V, then V
= 0.38V. If V
IN
OUT
IN
= 1.38V, then V
= 0.38V + (2 x 1V) = 2.38V. The net
OUT
result is that a 2V video output signal swings within the
usable output voltage range of the output buffer when
V
CC
= 3V.
Shutdown Mode
The MAX4090 features a low-power shutdown mode
2nd-Order Butterworth Lowpass Filter Realization
(I
= 150nA) for battery-powered/portable applica-
SHDN
tions. Pulling the SHDN pin high enables the output.
Connecting the SHDN pin to ground (GND) disables the
output and places the MAX4090 into a low-power shut-
down mode.
Table 1 shows the normalized 2nd-order butterworth
LPF component values at 1rad/s with a source/load
impedance of 1Ω.
With the following equations, the L and C can be calcu-
lated for the cutoff frequency at 9MHz. Table 2 shows
the appropriated L and C values for different source/
load impedance, the bench measurement values for
the -3dB BW and attenuation at 27MHz. There is
approximately 20dB attenuation at 27MHz, which effec-
tively attenuates the sampling aliases. The MAX4090
requires low input impedance for stable operation and
it does not like the reactive input impedance. For R1/R2
Applications Information
Input Coupling the MAX4090
The MAX4090 input must be AC-coupled because the
input capacitor stores the clamp voltage. The MAX4090
requires a typical value of 0.1µF for the input clamp
to meet the Line Droop specification. A minimum of a
ceramic capacitor with an X7R temperature coef-
ficient is recommended to avoid temperature-related
problems with Line Droop. For extended temperature
operation, such as outdoor applications, or where the
impressed voltage is close to the rated voltage of the
capacitor, a film dielectric is recommended. Increasing
the capacitor value slows the clamp capture time.
Values above 0.5µF should be avoided since they do
not improve the clamp’s performance.
greater than 100Ω, a series resistor R
(Figure 1)
IS
Table 1. 2nd-Order Butterworth Lowpass
Filter Normalized Values
Rn1 = Rn2 (Ω)
Cn1 (F)
Ln1 (H)
1
1.414
1.414
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
between 20Ω to 100Ω is needed to isolate the input
capacitor (C4) to the filter to prevent the oscillation
problem.
3rd-Order Butterworth Lowpass Filter Realization
If more flat passband and more stopband attenuation are
needed, a 3rd-order LPF can be used. The design proce-
dures are similar to the 2nd-order butterworth LPF.
C
L R
n
n
L
C=
L=
Table 3 shows the normalized 3rd-order butterworth
lowpass filter with the cutoff frequency at 1 rad/s and
the stopband frequency at 3 rad/s. Table 4 shows the
appropriated L and C values for different source/load
impedance and the bench measurement values for
-3dB BW and attenuation at 27MHz. The attenuation is
over 40dB at 27MHz. At 6MHz, the attenuation is approx-
imately 0.6dB for R1 = R2 = 150Ω (Figure 5).
2πf R
2πf
C
L
C
Figure 2 shows the frequency response for R1 = R2 =
150Ω. At 6MHz, the attenuation is about 1.4dB. The
attenuation at 27MHz is about 20dB. Figure 3 shows
the multiburst response for R1 = R2 = 150Ω.
V
CC
C7
1µF
2-POLE RECONSTRUCTION LPF
L1
R
49.9Ω
C4
0.1µF
IS
R3
75Ω
V
CC
V
OUT
3.9µH
VIDEO
CURRENT
DAC
IN
OUT
FB
MAX4090
C1
150pF
R1
150Ω
R2
150Ω
SHDN
GND
V
CC
Figure 1. 2nd-Order Butterworth LPF with MAX4090
FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
-60
V
IN
500mV/div
V
OUT
500mV/div
10µs/div
0.1
1
10
100
FREQUENCY (MHz)
Figure 2. Frequency Response
Figure 3. Multiburst Response
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
V
CC
3-POLE RECONSTRUCTION LPF
C3
6.8pF
C7
1µF
R
49.9Ω
C4
0.1µF
IS
L1
4.7µH
R3
75Ω
V
CC
V
OUT
VIDEO
CURRENT
DAC
IN
OUT
FB
MAX4090
C1
120pF
C2
120pF
R1
150Ω
R2
150Ω
SHDN
GND
V
CC
Figure 4. 3rd-Order Butterworth LPF with MAX4090
Table 2. Bench Measurement Values
Table 3. 3rd-Order Butterworth Lowpass
Filter Normalized Values
3dB
BW
ATTENUATION
AT 27MHz
(dB)
R1 = R2
C1
L1
R
IS
(Ω)
Rn1 = Rn2
(Ω)
(pf)
(ΜH)
Cn1 (F)
Cn2 (F)
Cn3 (F)
Ln1 (H)
(MHz)
(Ω)
75
330
150
120
82
1.8
3.9
4.7
8.2
0
8.7
9.0
9.3
8.7
20
20
22
20
1
0.923
0.923
0.06
1.846
150
200
300
50
50
100
Table 4. Bench Measurement Values
ATTENUATION AT
27MHz (dB)
R1 = R2 (Ω)
C1 (pF)
C2 (pF)
C3 (pF)
L (µH)
R
(Ω)
3dB BW (MHz)
IS
75
220
120
56
220
120
56
15.0
6.8
2.2
4.7
0
9.3
8.9
9.0
43
50
45
150
300
50
3.3
10.0
100
typically > 220µF. In sag configuration, the MAX4090
eliminates the need for large coupling capacitors, and
instead requires two 22µF capacitors (Figure 6) to
reach the same performance as the large capacitor.
Bench experiments show that increasing the output
coupling capacitor C5 beyond 47µF does not improve
the performance. If the supply voltage is less than
4.5V, the sag correction is not recommended for the
MAX4090.
Sag Correction
In a 5V application, the MAX4090 can use the sag
configuration if an AC-coupled output video signal is
required. Sag correction refers to the low-frequency
compensation for the highpass filter formed by the
150Ω load and the output capacitor. In video applica-
tions, the cutoff frequency must be low enough to pass
the vertical sync interval to avoid field tilt. This cutoff
frequency should be less than 5Hz, and the coupling
capacitor must be very large in normal configuration,
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Layout and Power-Supply Bypassing
FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
-60
The MAX4090 operates from single 2.7V to 5.5V supply.
Bypass the supply with a 0.1µF capacitor as close to the
pin as possible. Maxim recommends using microstrip and
stripline techniques to obtain full bandwidth. To ensure
that the PC board does not degrade the device’s perfor-
mance, design it for a frequency greater than 1GHz. Pay
careful attention to inputs and outputs to avoid large par-
asitic capacitance. Whether or not you use a constant-im-
pedance board, observe the following design guidelines:
● Do not use wire-wrap boards; they are too inductive.
0.1
1
10
100
● Do not use IC sockets; they increase parasitic capac-
FREQUENCY (MHz)
itance and inductance.
Figure 5. Frequency Response for R1 = R2 = 150W
● Use surface-mount instead of through-hole compo-
nents for better, high-frequency performance.
● Use a PC board with at least two layers; it should be
as free from voids as possible.
● Keep signal lines as short and as straight as possi-
ble. Do not make 90° turns; round all corners.
V
CC
3-POLE RECONSTRUCTION LPF
C3
6.8pF
C7
1µF
C5
22µF
L1
4.7µH
C4
0.1µF
R
49.9Ω
IS
R3
75Ω
V
CC
V
OUT
VIDEO
CURRENT
DAC
IN
OUT
FB
C1
120pF
C2
120pF
MAX4090
R1
150Ω
R2
150Ω
C6
22µF
SHDN
GND
V
CC
Figure 6. Sag Correction Configuration
Maxim Integrated
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
V
= 2.7V TO 5.5V
C
CC
V
CC
BYP
0.1µF
MAX4090
SHDN
C
0.1µF
IN
R
SOURCE
75Ω
IN
R
OUT
75Ω
E
OUT
OUT
R
75Ω
IN
E
SIGNAL
R
75Ω
L
CLAMP
FB
GND
Figure 7. Typical Operating Circuit
V
= 2.7V TO 5.5V
C
CC
V
CC
BYP
0.1µF
MAX4090
SHDN
OUT
C
0.1µF
IN
R
SOURCE
75Ω
IN
R
75Ω
OUT
330µF
E
OUT
R
IN
E
SIGNAL
75Ω
R
L
CLAMP
75Ω
FB
GND
Figure 8. AC-Coupled Output Circuit
Chip Information
TRANSISTOR COUNT: 755
PROCESS: BiCMOS
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGETYPE
PACKAGECODE
DOCUMENTNO.
6 SOT23
6 μDFN
6 SC70
U6F-6
L622-1
X6SN-1
21-0058
21-0164
21-0077
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Maxim Integrated
│ 13
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Maxim Integrated
│ 14
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Maxim Integrated
│ 15
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Maxim Integrated
│ 16
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MAX4090
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
11/09
4/15
4
5
Added automotive part
Removed automotive product and reference
1
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
│ 17
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