NSC LM1207N, LM1207, LM1205N, LM1205 Datasheet
LM1205/LM1207
130 MHz/85 MHz RGB Video Amplifier System with
Blanking
Y
General Description
The LM1205/LM1207 is a very high frequency video amplifier system intended for use in high resolution RGB monitor
applications. In addition to the three matched video amplifiers, the LM1205/LM1207 contains three gated single ended input black level clamp comparators for brightness control, three matched DC controlled attenuators for contrast
control, and three DC controlled sub-contrast attenuators
providing gain trim capability for white balance. All DC control inputs offer high input impedance and an operation
range from 0V to 4V for easy interface to bus controlled
alignment systems. The LM1205/LM1207 also contains a
blanking circuit which clamps the video output voltage during blanking to within 0.1V above ground. This feature provides blanking capability at the cathodes of the CRT. A spot
killer is provided for CRT phosphor protection during powerdown.
Features
Y
Three wideband video amplifiers 130 MHz (LM1205)
b
3dB(4VPPoutput)
Y
Matched (g0.1 dB or 1.2%) attenuators for contrast
control
Three externally gated single ended input comparators
for cutoff and brightness control
Y
0V to 4V, high input impedance DC contrast control
l
(
40 dB range)
Y
0V to 4V, high input impedance DC drive control for
each video amplifier (
Y
Spot killer, blanks output when V
Y
Capable of 7 VPPoutput swing (slight reduction in
b
6 dB to 0 dB range)
CC
k
bandwidth)
Y
Output stage blanking
Y
Output stage directly drives most hybrid or discrete
CRT drivers
Applications
Y
High resolution RGB CRT monitors
Y
Video AGC amplifiers
Y
Wideband amplifiers with gain and DC offset controls
Y
Interface amplifiers for LCD or CCD systems
@
LM1205/LM1207 130 MHz/85 MHz RGB Video Amplifier System with Blanking
January 1996
10.6V
Block and Connection Diagram
FIGURE 1
Order Number LM1205N or LM1207N
See NS Package Number N28B
C
1996 National Semiconductor Corporation RRD-B30M66/Printed in U. S. A.
TL/H/11881
TL/H/11881– 1
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
Pins 3, 11, 22, 23, 25 (Note 3) 15V
CC
)
Operating Ratings (Note 2)
Temperature Range
Supply Voltage (VCC) 10.8VsV
Peak Video Output Source Current
(Any One Amp) Pins 17, 20 or 26 28 mA
t
Voltage at Any Input Pin (V
)V
IN
CC
t
V
GND
IN
Power Dissipation (PD)
(Above 25
Thermal Resistance (iJA)50
Junction Temperature (T
C Derate Based on iJAand TJ) 2.5W
§
) 150§C
J
C/W
§
ESD Susceptibility (Note 4) 2 kV
Pins 12, 13 and 14 1.9 kV
4V; V
b
65§Cto150§C
C
§
e
4V unless otherwise stated.
drive
(Figure 2 ),
Storage Temperature
Lead Temperature (Soldering, 10 sec.) 265
DC Electrical Characteristics See DC Test Circuit
e
V
0V; V
14
cut-off
e
1.0V; V
e
13
Symbol Parameter Conditions
I
S
V
4, 6, 9
R
IN
V
14l
V
14h
I
14l
I
14h
I
clamp
I
bias
V
13l
V
13h
I
13l
I
13h
V
OL
V
OH
V
O(1V)
DV
O(1V)
Supply Current V
Video Amplifier Input Bias Voltage 2.8 V
Video Input Resistance Any One Amplifier 20 kX
Clamp Gate Low Input Voltage Clamp Comparators On 1.2 0.8 V (max)
Clamp Gate High Input Voltage Clamp Comparators Off 1.6 2.0 V (min)
Clamp Gate Low Input Current V
Clamp Gate High Input Current V
Clamp Cap Charge Current Clamp Comparators On
Clamp Cap Bias Discharge Current Clamp Comparators Off 500 nA
Blank Gate Low Input Voltage Blank Gate On 1.2 0.8 V (max)
Blank Gate High Input Voltage Blank Gate Off 1.6 2.0 V (min)
Blank Gate Low Input Current V
Blank Gate High Input Current V
Video Output Low Voltage V
Video Output High Voltage V
Video Black Level Output Voltage V
Video D Black Level Output Voltage Between Any Two Amplifiers,
VOL(blanked) Video Output Blanked Voltage V
I
12, 15, 18 or 28
I
16, 19 and 27
V
spot
Contrast/Drive Control Input Current V
Cut-Off Control Input Current (All Inputs) V
Spot Killer Voltage VCCAdjusted to Activate 10.4 10.8 V (max)
a
V
CC1
CC2,RL
e
0V
14
e
12V 0.01 1.0 mA (max)
14
e
0V
13
e
12V 0.01 1.0 mA (max)
13
e
0V 0.15 0.5 V (max)
cut-off
e
9V 7.5 7 V (min)
cut-off
e
1V 1.0 V (Note 8)
cut-off
e
V
1V
cut-off
e
0V 35 70 mV (max)
13
e
e
0V to 4V
V
drive
contrast
cut-off
b
e
T
25§C; V
A
CC1
e
e
V
12V. V
CC2
Typical Limit
(Note 5) (Note 6)
e %
(Note 7) 90 105 mA (max)
e
0V to 4V
b
g
750
b
8.5
g
100 mV (max)
b
250 nA
b
500 nA
b
1
5 mA (max)
g
500 mA (min)
b
11.0 mA (max)
20§Cto80§C
s
13.2V
CC
e
4V;
12
Units
http://www.national.com 2
AC Electrical Characteristics See AC Test Circuit
(Figure 3)
adjust Video Output pins 17, 20, and 26 to 4V DC for the AC test unless otherwise stated. (Note 14)
,T
e
25§C; V
A
Symbol Parameter Conditions
A
V max
DA
V2V
DA
V 0.25V
DDrive Drive Control Range V
A
V match
A
V track1
THD Video Amplifier Distortion V
Video Amplifier Gain V12e4V, V
V
drive
Attenuation@2V Ref: AVmax, V12e2V
Attenuation@0.25V Ref: AVmax, V12e0.25V
drive
Absolute Gain Match@AVmax V12e4V, V
Gain Change Between Amplifiers V12e4V to 2V (Notes 9, 10)
e
O
f(b3 dB) Video Amplifier Bandwidth V12e4V, V
(Notes 11, 12)
tr(Video) Video Output Rise Time (Note 11) V
e
V
O
e
O
e
635 mV
IN
e
4V
e
0V to 4V, V12e4V 6 dB
drive
e
4V (Note 9)
PP
1VPP,fe10 kHz 1 %
e
4V, LM1205 130
drive
4V
4V
PP
PP
LM1207 85
LM1205 2.6
e
e
V
CC2
12V. Manually
Units
CC1
Typical Limit
(Note 5) (Note 6)
7.0 6.0 V/V (min)
16.9 15.6 dB (min)
b
6dB
b
40 dB
g
0.3 dB
g
0.1 dB
MHz
LM1207 4.3
tf(Video) Video Output Fall Time (Note 11) V
e
4V
O
PP
LM1205 3.6
LM1207 4.3
V
10 kHz Video Amplifier 10 kHz Isolation V12e4V (Note 13)
sep
V
10 MHz Video Amplifier 10 MHz Isolation V12e4V (Notes 11, 13)
sep
tr(Blank) Blank Output Rise Time (Note 11) Blank Outpute1V
t
(Blank) Blank Output Fall Time (Note 11) Blank Outpute1V
f
t
(Clamp) Min. Back Porch Clamp Pulse Width 200 ns
pw
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications
and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics
may degrade when the device is not operated under the listed test conditions.
Note 3: V
Note 4: Human body model, 100 pF discharged through a 1.5 kX resistor.
Note 5: Typical specifications are specified at
Note 6: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 7: The supply current specified is the quiescent current for V
depends on the output load. With video output at 1V DC, the additional current through V
Note 8: Output voltage is dependent on load resistor. Test circuit uses R
Note 9: Measure gain difference between any two amplifiers. V
Note 10: D A
gain change between any two amplifiers with the contrast voltage (V12) at either 4V or 2V measured relative to an A
max the three amplifiers’ gains might be 17.1 dB, 16.9 dB and 16.8 dB and change to 11.2 dB, 10.9 dB, and 10.7 dB respectively for V12e2V. This yields the
measured typical
Note 11: When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socket is
recommended. Video amplifier 10 MHz isolation test also requires this printed circuit board. The reason for a double sided full ground plane PCB is that large
measurement variations occur in single sided PCBs.
Note 12: Adjust input frequency from 10 MHz (A
Note 13: Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undriven
amplifier inputs to simulate generator loading. Repeat test at f
Note 14: During the AC tests the 4V DC level is the center voltage of the AC output signal. For example, if the output is 4 V
and 6V DC.
supply pins 3, 11, 22, 23, 25 must be externally wired together to prevent internal damage during VCCpower on/off cycles.
CC
a
25§C and represent the most likely parametric norm.
and V
CC2
e
L
635 mVPP.
10 MHz for V
with R
390X.
sep 10 MHz
CC1
e
track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in
V
g
0.1 dB channel tracking.
max reference level) to theb3 dB corner frequency (f
V
IN
e
IN
L
e %
CC2
PP
PP
, see
Figure 2’s
is8mAfor
.
test circuit. The supply current for V
Figure 2’s
b
3dB
b
70 dB
b
50 dB
7ns
7ns
(pin 23) also
test circuit.
max condition, V12e4V. For example, at A
V
).
the signal will swing between 2V DC
PP
CC2
ns
ns
V
http://www.national.com3
Typical Performance Characteristics V
Attenuation vs Contrast Voltage
CC
e
12V, T
e
25§C unless otherwise specified
A
Attenuation vs Drive Voltage
TL/H/11881– 2
LM1205 Crosstalk vs Frequency
LM1205 Contrast vs Frequency
LM1205 Drive vs Frequency
TL/H/11881– 3
TL/H/11881– 4
TL/H/11881– 5
http://www.national.com 4
TL/H/11881– 6
Typical Performance Characteristics V
LM1207 Crosstalk vs Frequency
LM1207 Contrast vs Frequency
CC
e
12V, T
e
25§C unless otherwise specified (Continued)
A
TL/H/11881– 7
LM1207 Drive vs Frequency
TL/H/11881– 8
TL/H/11881– 9
http://www.national.com5
Applications Information
FIGURE 2. LM1205N/LM1207N DC Test Circuit
http://www.national.com 6
TL/H/11881– 10
Applications Information (Continued)
FIGURE 3. LM1205N/LM1207N AC Test Circuit
TL/H/11881– 11
http://www.national.com7
Applications Information (Continued)
FIGURE 4. LM1205N/LM1207N PCB Test Circuit
http://www.national.com 8
TL/H/11881– 12
Loading...