LM1201 Datasheet PDF - National Semiconductor

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LM1201
National Semiconductor

Part Number LM1201
Description Video Amplifier System
Page 16 Pages


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January 1995
LM1201 Video Amplifier System
General Description
The LM1201 is a wideband video amplifier system intended
for high resolution monochrome or RGB monitor applica-
tions In addition to the wideband video amplifier the
LM1201 contains a gated differential input black level clamp
comparator for brightness control and an attenuator circuit
for contrast control The LM1201 also contains a voltage
reference for the video input For medium resolution RGB
color monitor applications also see the LM1203 Video Am-
plifier System data sheet
Features
Y Wideband video amplifier (200 MHz b3 dB)
Y Attenuator circuit for contrast control (l40 dB range)
Y Externally gated comparator for brightness control
Y Provisions for external gain set and peaking of video
amplifier
Y Video input voltage reference
Y Low impedance output driver
Typical Applications
Y CRT video amplifiers
Y Video switches
Y High frequency video preamplifiers
Y Wideband gain controls
Y PC monitors
Y Workstations
Y Facsimile machines
Y Printers
Block and Connection Diagram
FIGURE 1
Order Number LM1201M or LM1201N
See NS Package Number M16A or N16E
TL H 10006 – 1
C1996 National Semiconductor Corporation TL H 10006
RRD-B30M56 Printed in U S A



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Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage VCC Pins 10 12 15
to Ground Pins 1 7
13 5V
Voltage at Any Input Pin (VIN)
VCC t VIN t GND
Video Output Current (I8)
28 mA
Package Power Dissipation at TA e 25 C
(Above 25 C derate based on (iJA and TJ)
1 56W
Package Thermal Resistance (iJA) N16E
80 C W
Package Thermal Resistance (iJA) M16A
100 C W
Junction Temperature (TJ)
150 C
Storage Temperature Range (TSTG)
b65 C to a150 C
Lead Temperature (Soldering 10 sec )
265 C
ESD Susceptibility
2 kV
Human body model 100 pF discharged through a 1 5 kX
resistor
Operating Ratings (Note 4)
Temperature Range
0 C to a70 C
Supply Voltage (VCC)
10 8V s VCC s 13 2V
Electrical Characteristics See Test Circuit (Figure 2) TA e 25 C VCC1 e VCC2 e VCC3 e 12V
DC Static Tests S9 Open V4 e 6V V5 e 0V V6 e 2 0V unless otherwise stated
Symbol
IS
V3
I16
V5L
V5H
I5L
I5H
I2a
I2b
V8L
V8H
VOS
Parameter
Supply Current
Video Input Reference Voltage
Video Input Bias Current
Clamp Gate Low Input Voltage
Clamp Gate High Input Voltage
Clamp Gate Low Input Current
Clamp Gate High Input Current
Clamp Cap Charge Current
Clamp Cap Discharge Current
Video Output Low Voltage
Video Output High Voltage
Comparator Input Offset Voltage
Conditions
VCC Pins 12 15 Only
(V3 – V16) 10 kX
Clamp Comparator On
Clamp Comparator Off
V5 e 0V
V5 e 12V
V2 e 0V
V2 e 5V
V2 e 0V
V2 e 5V
V6 – V9
Typical
45
2 65
50
12
16
b0 5
0 005
1
b1
05
85
g0 5
Tested
Limit
(Note 1)
57
24
2 95
20
08
20
b5 0
1
0 55
b0 55
09
80
g25
Design
Limit
(Note 2)
Units
(Limits)
mA(max)
V(min)
V(max)
mA(max)
V(min)
V(max)
mA(max)
mA(max)
mA(min)
mA(min)
V(max)
V(min)
mV(max)
AC Dynamic Tests S9 Closed V5 e 0V V6 e 4V
Symbol
Parameter
Conditions
Tested
Design
Units
Typ
Limit (Note 1) Limit (Note 2) (Limits)
Av max Video Amplifier Gain
V4 e 12V
8 55
V V(min)
DAv 5V Attenuation 5V
Ref Av max V4 e 5V
b10
dB
DAv 2V Attenuation 2V
Ref Av max V4 e 2V
b45
dB
THD
Video Amplifier Distortion
V4 e 5V VO e 1 Vp-p
03
%
f (b3dB) Video Amplifier Bandwidth (Note 3) V4 e 12V VO e 100 mVrms 200
170 MHz(min)
tr Output Rise Time (Note 3)
VO e 4 Vp-p
25
ns
tf Output Fall Time (Note 3)
VO e 4 Vp-p
3
ns
Note 1 These parameters are guaranteed and 100% production tested
Note 2 Design limits are guaranteed (but not 100% production tested) These limits are not used to calculate outgoing quality levels
Note 3 When measuring video amplifier bandwidth or pulse rise and fall times a double sided full ground plane printed circuit board without socket is recommend-
ed
Note 4 Operating Ratings indicate conditions of which the device is functional but does not guarantee specific performance limits For guaranteed specifications
and test conditions see 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
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FIGURE 2 LM1201 AC DC Test Circuit
TL H 10006 – 2
Note When V5 s 0 8V and S9 is closed DC feedback around the Video Amplifier is provided by the clamp comparator Under these conditions sine wave or 50%
duty cycle square waves can be used for test purposes The low frequency dominant pole is determined by C2 at Pin 2 Capacitor C9 at pin 9 prevents overloading
the clamp comparator inverting input See applications section for additional information
FIGURE 3 Typical Application of the LM1201
TL H 10006 – 3
30X resistor is added to the input pin for protection against current surges coming from the 10 mF input capacitor By increasing this resistor to well over 100X
the rise and fall times of the LM1201 can be increased for EMI considerations
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APPLICATIONS INFORMATION
Figure 4 shows the block diagram of a typical analog mono-
chrome monitor The monitor is used with CAD CAM work
stations PCs arcade games and in a wide range of other
applications that benefit from the use of high resolution dis-
play terminals Monitor characteristics may differ in such
ways as sweep rates screen size or in video amplifier
speed but will still be generally configured as shown in Fig-
ure 4 Separate horizontal and vertical sync signals may be
required or they may be contained as a composite signal in
the video input signal The video input signal is usually
supplied by coaxial cable which is terminated in 75X at the
monitor input and internally AC coupled to the video amplifi-
er The input signal is approximately 1V peak-to-peak in am-
plitude and at the input of the high voltage video section
approximately 6V peak-to-peak At the cathode of the CRT
the video signals can be as high as 60V peak to peak The
block in Figure 4 labeled ‘‘Video Amplification with DC Con-
trolled Gain Black Level’’ contains the function of the
LM1201 video amplifier system
FIGURE 4 Typical Monochrome Monitor Block Diagram
TL H 10006 – 4
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