ISO-9001 CERTIFIED BY DSCC
HIGH SPEED/HIGH VOLTAGE
VIDEO AMPLIFIER
M.S.KENNEDY CORP.
1902
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 CERTIFIED
FEATURES:
100VPP Output Signal into 10PF
Ultra Fast Transition Times-3nS
User Adjustable Contrast and Brightness
TTL Compatible Blanking
On Board DC Reference Output
Customized Versions Available Upon Request
Available to DSCC SMD 5962-8997201HX
DESCRIPTION:
The MSK 1902 Series of high speed, high voltage video amplifiers was designed to drive the cathode of today's
high performance CRT's. The MSK 1902 has user adjustable contrast and brightness levels and also comes with a
blanking function. The MSK 1902 can be directly connected to many video sources including RS170, RS343 and high
speed video D/A converters. The MSK 1902 is available in four versions for different applications. The MSK 1902-0
has no internal high voltage resistor or inductor allowing the user to dissipate much of the power externally. The MSK
1902-2, MSK 1902-4 and the MSK 1902-6 each have an internal resistor-inductor designed for optimum bandwidth.
The MSK 1902-6 has slightly lower bandwidth but can be operated from up to +130V. Each version of the MSK
1902 is packaged in a 30 pin power flatpack that can be directly connected to a heat sink using standard 4-40
screws.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Helmet Mounted Displays
High Resolution RGB Displays
High Resolution Monochrome Displays
Automatic Test Equipment
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
9
10
GND
GND
Blank
VEE
VEE
VEE
-Input
+Input
GND
GND
1
11
12
13
14
15
16
17
18
19
20
VGAIN
VOFF
VREF
GND
GND
+VHV RES
+VHV RES
GND
GND
+VHV
21
22
23
24
25
26
27
28
29
30
+VHV
NC
Output
NC
Cath. Current RTN
VCC
VCC
GND
GND
GND
Rev. B 2/03
ABSOLUTE MAXIMUM RATINGS
+VHV
+VCC
-VEE
VIN
VIC
VGAIN
VOFF
High Voltage Supply (1902-0)
(1902-2)
(1902-4)
(1902-6)
Positive Supply Voltage
Negative Supply Voltage
Differential Input Voltage
Common Mode Input Voltage
Gain Adjust Input Voltage
Offset Adjust Input Voltage
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+110V
+110V
+75V
+130V
+17V
-12V
2V
±2V
-0.6 to +6V
-0.6 to +6V
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-0.6 to +6V
Blank Input Voltage
5mA
Reference Output Current
Storage Temperature Range -65°C to +150°C
300°C
Lead Temperature Range
(10 Seconds)
175°C
Junction Temperature
290mA
Current Through Rp
Case Operating Temperature Range
-55°C to +125°C
(All Devices B/E Suffix)
-40°C to +85°C
(All Devices No Suffix)
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TJ
IRP
TC
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VBLANK
IREF
TST
TLD
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ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions 1
MSK1902-2
MSK1902-4
Group A MSK1902-0
Subgroup Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
MSK1902-6
Units
Min. Typ. Max.
STATIC
VCM=0V @ +15V
1,2,3
-
75
100
-
75
100
-
75
100
-
75
100
mA
VCM=0V @ -10.5V
1,2,3
-
-75 -100
-
-75 -100
-
-75 -100
-
-75 -100
mA
High Voltage Supply 2 3
TC ≤ 125°C
-
30
100 110
Thermal Resistance to Case 3
QOUT/QCAS
-
-
32
Quiescent Current
35
30 100 110
-
32
35
30
70
75
-
32
35
30 120 130
-
32
35
V
°C/W
INPUT
1
-
±1 ±50
-
±1 ±50
-
±1 ±50
-
±1 ±50
µA
2,3
-
±5 ±250
-
±5 ±250
-
±5 ±250
-
±5 ±250
µA
VBLANK=0.4V
1
-
500 600
-
500 600
-
500 600
-
500 600
µA
VBLANK=2.4V
1
-
300 400
-
300 400
-
300 400
-
300 400
µA
Offset Adjust Input Current
VOFF=1V
1
-
2
10
-
2
10
-
2
10
-
2
10
µA
Gain Adjust Input Current
VGAIN=5V
1
-
2
10
-
2
10
-
2
10
-
2
10
µA
Blank Input Pulse Width 2
Normal Operation
-
30
-
-
30
-
-
30
-
-
30
-
-
nS
VCM=±0.5V F=10Hz
-
-
40
-
-
40
-
-
40
-
-
40
-
dB
Either Input F=DC
-
10
20
-
10
20
-
10
20
-
10
20
-
KΩ
Either Input
-
-
2
-
-
2
-
-
2
-
-
2
-
pF
-
-
- ±2xRp
-
- ±2xRp
-
- ±2xRp
-
-
VCM=0V
Input Bias Current
Blank Input Current
Common Mode Rejection Ratio 2
Input Impedance 2
Input Capacitance
VBLANK=2.4V VIN=0.3V
Blank Mode Input
Rejection ∆V
2
∆V=VHV-VOUT
3
Gain Adjust Rejection ∆V 2
3
∆VGAIN=5V
Power Supply Rejection Ratio 2 +VCC and -VEE=Nom ±5%
Internal Rp
2
3
- ±10xRp
-
-
-
25
30
-
-
-
0
-
1,2,3
5.2
5.5
5.8
25
- ±10xRp
30
-
380 400 420
25
- ±10xRp
30
-
190 200 210
25
±2xRp mV
- ±10xRp
30
-
mV
dB
380 400 420
Ω
5.2 5.5
V
OUTPUT
Reference Output Voltage
∆V Blank Mode
∆V Min Offset
IOUT<2mA
∆V=VHV-VOUT VOFF=1V
VBLANK=2.4V VGAIN=5V
∆V=VHV-VOUT VOFF=0V VGAIN=3V
1,2,3
5.2 5.5
5.8
5.2
5.5
5.8
-3xRp Rp 3xRp -3xRp Rp 3xRp -3xRp Rp 3xRp
5.8
-3xRp Rp 3xRp
mV
1,2,3
0
3
10
0
3
10
0
3
6
0
3
10
V
1
32
42
52
32
42
52
16
21
26
32
42
52
V
2,3
28
42
56
32
42
52
16
21
26
32
42
52
VIN=0.6V F=10KHz VGAIN=3V Both Inputs
4
72
36
55
68
72 120 145
Output Voltage High
VGAIN=3V F=10KHz
4
95
98
-
95
98
-
65
68
-
Output Voltage Low
VGAIN=3V F=10KHz
4
-
15
20
-
10
20
-
10
20
-
10
20
V
Transition Times
VIN=0.6V VOUT=Max TR=TF<0.5nS
4
-
4.0
5.5
-
3.4
4.0
-
2.3
2.8
-
6.5
8
nS
Linearity Error 2
VGAIN =4V VOFF=1V VCM=0.5V
-
-
-
±2
-
-
±2
-
-
±2
-
-
±2
%GS
Gain Linearity 2
VOFF=1V VIN=0.2V VCM=0.5V
-
-
-
±2
-
-
±2
-
-
±2
-
-
±2
%
-
-
-
±2
-
±2
-
-
±2
-
±2
%GS
∆V Max Offset
Voltage Gain
Thermal Distortion 2
∆V=VHV-VOUT VOFF=5V
110 138
72 110 138
115 118
-
V
V/V
V
NOTES:
1
2
3
4
5
6
7
+VCC = +15V, -VEE = -10.5V, VBLANK =0.4V, VGAIN = VOFF = ±VIN = 0V, CL=10pF, VHV=typical value and TC=25°C unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
RP=Internal RP except MSK 1902-0. External value = 400Ω unless otherwise specified for the MSK 1902-0.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("B" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1,4 TA=TC=+25°C
2,5 TA=TC=+125°C
3,6 TA=TC=-55°C
2
Rev. B 2/03
APPLICATION NOTES
VIDEO INPUTS
POWER SUPPLIES
The video input signals should be kept below ±2VMAX total,
including both common mode offset and signal levels. The input structure of the MSK 1902 was designed for ±0.714Vpp
RS343 signals. If either input is not used it should be connected directly to the analog ground or through a 25Ω resistor
to ground if input offset currents are to be minimized.
The input stage of the MSK 1902 requires power supplies of
+15V and -10.5V for optimum operation. The negative power
supply can be increased to -12V if -10.5V is not available, but
additional power dissipation will cause the internal temperature
to rise. Both low voltage power supplies should be effectively
decoupled with tantalum capacitors (at least 4.7µF) connected
as close to the amplifier's pins as possible. The MSK 1902 has
internal 0.01µF capacitors that also improve high frequency
performance. In any case, it is also recommended to put 0.1µF
decoupling capacitors on the +15V and -10.5V supplies as
well.
OUTPUT PROTECTION
The output pin of the MSK 1902 should be protected from
transients by connecting reverse biased ultra-low capacitance
diodes from the output pin to both +VHV and ground. The
output can also be protected from arc voltages by inserting a
small value (50-100Ω) resistor in series with the amplifier output. This resistor will reduce system bandwidth along with the
load capacitance, but a series inductor can reduce the problem
substantially.
The high voltage power supply (+VHV) is connected to the
amplifier's output stage and must be kept as stable as possible.
The internal or external Rp is connected to +VHV and as such,
the amplifier's DC output is directly related to the high voltage
value. The +VHV pins of the hybrid should be decoupled to
ground with as large a capacitor as possible to improve output
stability.
VGAIN CONTROL INPUT
The VGAIN control (contrast) input is designed to allow the
user to vary the video gain. By simply applying a DC voltage
from 0V to VREF, the video gain can be linearly adjusted from 0
to 80V/V. The VGAIN input should be connected to the VREF pin
through a 5KΩ pot to ground. For convenient stable gain adjustment, a 0.1µF bypass capacitor should be connected near the
VGAIN input pin to prevent output instability due to noisy sources.
Digital gain control can be accomplished by connecting a D/A
converter to the VGAIN pin. However, some temperature tracking performance may be lost when using an external DC voltage
source other than VREF for gain adjustment.
SUPPLY SEQUENCING
The power supply sequence is +VHV, +VCC, -VEE followed
by the other DC control inputs. If power supply sequencing is
not possible, the time difference between each supply should
be less than five milliseconds. If the DC control signals are
being generated from a low impedance source other than the
VREF output, reverse biased diodes should be connected from
each input (VGAIN, VOFF) to the +VCC pin. This will protect the
inputs until +VCC is turned on.
The overall video output of the MSK 1902 can be characterized using the following expression:
VIDEO OUTPUT
Vpp=VHV-VOUT
When power is first applied and VIN=VGAIN=VOFF=0V, the
output will be practically at the +VHV rail voltage. The output
voltage is a function of the value of Rp and also the VGAIN and
VOFF DC inputs. The maximum output voltage swing for any of
the MSK 1902 variants is determined by Vpp = (250mA) x
(Rp). The bandwidth of the amplifier largely depends on both
Rp and Lp.
VHV-VOUT=(VIN) (VGAIN) (0.1) (Rp) (0.9)
Here is a sample calculation for the MSK 1902-2:
Given information:
VIN=0.7V
VGAIN=1VDC
Rp=400Ω (internal)
VHV=100VDC
VHV-VOUT=(0.7V) (1V) (0.1) (400Ω) (0.9)
VHV-VOUT=25.2V Nominal
Hybrid pins 16 and 17 are directly connected to Rp. Additional external resistance can be added to reduce power dissipation, but slower transition times will result. If an additional
resistor is used, it must be low capacitive and the layout should
minimize capacitive coupling to ground (ie: no ground plane
under Rp).
The expected video output would swing from approximately
+100V to +74.8V assuming that VOFF=0V. This calculation
should be used as a nominal result because the overall gain may
vary as much as ±20% due to internal high speed device variations. Changing ambient conditions can also affect the video
gain of the amplifier by as much as 150 PPM/°C. It is wise to
connect all video amplifiers to a common heat sink to maximize
thermal tracking when multiple amplifiers are used in applications such as RGB systems. Additionally, only one of the VREF
outputs should be shared by all three amplifiers. This voltage
should be buffered with a suitable low drift op-amp for best
tracking performance.
The MSK 1902 series is conservatively specified with low
values for Lp which yield about 5% overshoot. Additional peaking can be obtained by using a high self-resonant frequency
inductor in series with the Rp pins. Since this value of inductance can be very dependent on circuit layout, it is best to
determine its value by experimentation. A good starting point
is typically 0.47µH for the MSK 1902-0 and 0.0047µH for the
remaining devices.
If external resistors or inductors are not used, be sure to
connect high frequency bypass capacitors directly from pins
16 and 17 to ground.
3
Rev. B 2/03
APPLICATION NOTES CON'T
VOFF CONTROL INPUT
BLANK INPUT
The brightness (output offset) can be linearly adjusted by
applying a 0 to VREF DC voltage to the VOFF input pin. The
output quiescent voltage range is from approximately (5µA)
(Rp) to (100mA) (Rp) from +VHV. This control voltage is normally generated by connecting the VOFF control pin to a 5K
potentiometer between VREF and ground. The VOFF input pin
should be bypassed with a 0.1µF capacitor to ground placed as
close as possible to the hybrid. This DC voltage can be any
stable system source.
The video input can be electrically disconnected from the
amplifier by applying a TTL high input to the blank pin. When
this occurs, the output will be set to approximately +VHV. The
VGAIN and VOFF control pins have little or no effect on the output when it is in blank mode.
When the TTL compatible blank input is not used, the pin
must be connected to ground to enable the amplifier. The blank
input will float high when left unconnected which will disable
the video output.
Keep hybrid power dissipation in mind when adjusting the
output quiescent voltage. Practically all of the voltage is seen
across Rp. This power must be taken into account when high
Rp currents are used. If the quiescent level is set too close to
+VHV, the power dissipation will be minimal but the rise time
will suffer slightly. If the quiescent level is set too far from
VHV, the power dissipation will increase dramatically and the
output fall time will be limited. The output black level is obviously dependent on system requirements but a little experimentation will strike the optimum balance between power dissipation and bandwidth. Total current through Rp should be
limited to less than 290mA when operating from power supplies greater than 90V. The gain adjust alone can set the AC
current to 250mA (ie: 250mApp=100Vpp/400Ω). Typically,
most applications use about 10V from +VHV for a black level.
VREF OUTPUT
The MSK 1902 has an on board buffered DC zener reference
output. The VREF output is nominally 5.5V DC and has full temperature test limits of 5.2V to 5.8V DC. This output is provided
for gain and offset adjustment and can source up to 4mA of
current.
THERMAL MANAGEMENT
The MSK 1902 package has mounting holes that allow the
user to connect the amplifier to a heat sink or chassis. Since
the package is electrically isolated from the internal circuitry,
mounting insulators are not required or desired for best thermal
performance. Use 4 to 6 inch/pounds for mounting the device
to the heat sink.
The power dissipation of the amplifier depends mainly on the
load requirements, bandwidth, pixel size, black level and the
value of Rp. The following table illustrates a few examples:
PERCENT OF SIGNAL
DEVICE
TYPE
+VHV
BLACK
LEVEL
WHITE
LEVEL
OUTPUT
VOLTAGE
BLANK
BLACK
WHITE
OUTPUT
AVE. Pd
TOTAL
AVE. Pd
1902-6
120V
110V
20V
0V
100%
0%
0%
0W
2.5W
1902-6
120V
110V
20V
90V
20%
40%
40%
13.3W
15.7W
1902-4
70V
65V
15V
0V
100%
0%
0%
0W
2.5W
20%
40%
40%
8.4W
10.6W
1902-4
70V
65V
15V
50V
This table does not include power dissipation due to output switching since this is dependent on individual load requirements. The input stage power
dissipation is typically 2.5 watts and is essentially independent of output levels.
RESOLUTION TABLE FOR A TYPICAL CRT
Maximun
Pixel
Time
Minimum Pixel
Clock
Frequency
Required Rise Time
at CRT
Required System
Bandwidth
(F-3dB)
320 x 200
182nS
5MHz
60nS
6MHz
640 x 350
52nS
19MHz
17nS
20MHz
640 x 480
38nS
26MHz
12.5nS
28MHz
Display
Resolution
800 x 560
26nS
38MHz
8.6nS
41MHz
1024 x 900
12.6nS
80MHz
4.2nS
84MHz
1024 x 1024
11nS
90MHz
3.7nS
95MHz
1280 x 1024
8.9nS
112MHz
2.9nS
120MHz
1664 x 1200
5.8nS
170MHz
1.9nS
180MHz
2048 x 2048
2.8nS
360MHz
1nS
380MHz
4096 x 3300
860pS
1.2GHz
280pS
1.23GHz
All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate.
4
Rev. B 2/03
TYPICAL CONNECTION CIRCUIT
The connection circuit shown above is for the MSK 1902-0 evaluation board. The Rp and Lp are external components and must not be located near ground planes if possible. A high quality resistor such as Bradford Electronics P/
N FP10-400 is required for optimum response times. Use an inductor with a high self-resonant frequency that can
withstand the currents required for the application.
When using the other variants of the MSK 1902, place an additional bypass capacitor on pins 16 and 17 if series
(Rp and Lp) components are not utilized. The pin should connect to +VHV with a short low impedance path.
For additional application information, please contact MSK. Evaluation amplifiers with test boards are available
upon request.
NOTES:
5
Rev. B 2/03
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
PART
NUMBER
MSK 1902-0
MSK 1902B-0
MSK 1902E-0
5962-8997201HX
MSK 1902-2
MSK 1902B-2
MSK1902E-2
5962-8997202HX
MSK 1902-4
MSK 1902B-4
MSK1902E-4
MSK 1902-6
MSK 1902B-6
MSK1902E-6
+VHV
MAX
110V
110V
110V
110V
110V
110V
110V
110V
75V
75V
75V
130V
130V
130V
INTERNAL
RP
NONE
NONE
NONE
NONE
400
400
400
400
200
200
200
400
400
400
TYPICAL
RISE TIME
4.0nS
4.0nS
4.0nS
4.0nS
3.4nS
3.4nS
3.4nS
3.4nS
2.3nS
2.3nS
2.3nS
6.5nS
6.5nS
6.5nS
SCREENING
LEVEL
Industrial
Mil-PRF-38534 Class H
Extended Reliability
DSCC-SMD
Industrial
Mil-PRF-38534 Class H
Extended Reliability
DSCC-SMD
Industrial
Mil-PRF-38534 Class H
Extended Reliability
Industrial
Mil-PRF-38534 Class H
Extended Reliability
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
6
Rev. B 2/03