ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
HIGH SPEED/HIGH VOLTAGE
NEGATIVE OUTPUT
VIDEO AMPLIFIER
1903
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-2.9nS
User Adjustable Contrast and Brightness
TTL Compatible Blanking
On Board DC Reference Output
Customized Versions Available Upon Request
Available to DSCC SMD 5962-9324301HX
DESCRIPTION:
The MSK 1903 Series of high speed, high voltage video amplifiers was designed to drive the grid of today's high
performance CRT's. The MSK 1903 has user adjustable contrast and brightness levels and also comes with a blanking
function. The MSK 1903 can be directly connected to many video sources including RS170, RS343 and high speed
video D/A converters. The MSK 1903 is available in four versions for different applications. The MSK 1903-0 has no
internal high voltage resistor or inductor allowing the user to dissipate much of the power externally. The MSK 19032, MSK 1903-4 and the MSK 1903-6 each have an internal resistor-inductor designed for optimum bandwidth. The
MSK 1903-6 has slightly lower bandwidth but can be operated from down to -120V. Each version of the MSK 1903
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
Beam Index Applications
Projection Displays
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
NC
NC
VCC
VCC
GND
GND
Rev. B 3/03
ABSOLUTE MAXIMUM RATINGS
-VHV
+VCC
-VEE
VIN
VIC
VGAIN
VOFF
High Voltage Supply (1903-0)
(1903-2)
(1903-4)
(1903-6)
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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VBLANK
IREF
TST
TLD
-95V
-95V
-75V
-120V
+22V
-12V
2V
±2V
-0.6 to +6V
-0.6 to +6V
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TJ
IRP
TC
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Blank Input Voltage
-0.6 to +6V
Reference Output Current
5mA
Storage Temperature Range
-65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Junction Temperature
175°C
Current Through Rp
290mA
Case Operating Temperature Range
(All Devices B/E Suffix)
-55°C to +125°C
(All Devices No Suffix)
-40°C to +85°C
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ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions 1
MSK1903-2
MSK1903-4
Group A MSK1903-0
Subgroup Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
MSK1903-6
Units
Min. Typ. Max.
STATIC
VCM=0V @ +20V
Quiescent Current
High Voltage Supply 2 3
Thermal Resistance to Case 2
8
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
TC ≤ 125°C
-
Junction to Case
-
-
32
-30 -90
-95
35
-30 -90
-
32
-95
-30
-70
-75
35
-
32
35
-50 -100 -120
-
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
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
-
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
∆V Max Offset
IOUT<2mA
1,2,3
5.2 5.5
∆V=VHV-VOUT VOFF=1V
VBLANK=2.4V VGAIN=5V
∆V=VHV-VOUT VOFF=0V VGAIN=3V
∆V=VHV-VOUT VOFF=5V
5.8
5.2 5.5
5.8
5.2
5.5
5.8
-3xRp Rp 3xRp -3xRp Rp 3xRp -3xRp Rp 3xRp
1,2,3
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
36
55
68
72 120 145
V
VIN=0.6V F=10KHz VGAIN=3V Both Inputs
4
72 110 138
Output Voltage High
VGAIN=3V F=10KHz
4
-85 -88
-
-65
-68
-
Output Voltage Low
VGAIN=3V F=10KHz
4
-
-1
-5
-
-1
-5
-
-1
-5
-
-1
-5
V
Transition Times
VIN=0.6V VOUT=Max TR=TF<1nS
4
-
4.2
6.0
-
3.8
5.5
-
2.9
4.0
-
6.5
10
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
Voltage Gain
Thermal Distortion 2
-
72 110 138
-85 -88
-95 -98
-
V/V
V
NOTES:
1
2
3
4
5
6
7
+VCC = +20V, -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 1903-0. External value = 400Ω unless otherwise specified for the MSK 1903-0.
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
8 Does not include output current referenced to +VCC.
2
Rev. B 3/03
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 1903 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 1903 requires power supplies of
+20V and -10.5V for optimum performance. 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
1903 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 +20V and -10.5V supplies as well.
OUTPUT PROTECTION
The output pin of the MSK 1903 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. 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 1903 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 1903 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 1903-2:
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
-80V to -54.8V 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 effect 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 1903 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 1903-0 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 3/03
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 disconnected which will disable
the video.
VREF 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). This would
leave about 40mA left for black level output current.
DEVICE
TYPE
-VHV
BLACK
LEVEL
WHITE
LEVEL
1903-6
-120V
-110V
The MSK 1903 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 1903 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
OUTPUT
VOLTAGE
BLANK
-20V
0V
100%
0%
20%
40%
OUTPUT
AVE. Pd
TOTAL
AVE. Pd
0%
0W
2.5W
40%
13.3W
15.7W
WHITE
BLACK
1903-6
-120V
-110V
-20V
-90V
1903-4
-70V
-65V
-15V
0V
100%
0%
0%
0W
2.5W
1903-4
-70V
-65V
-15V
-50V
20%
40%
40%
8.4W
10.6W
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 3/03
TYPICAL CONNECTION CIRCUIT
The connection circuit shown above is for the MSK 1903-0 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 1903, 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 applications information, please contact MSK. Evaluation amplifiers with test boards are available
upon request.
NOTES:
5
Rev. B 3/03
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
PART
NUMBER
MSK 1903-0
MSK 1903B-0
MSK 1903E-0
5962-9324301HX
MSK 1903-2
MSK 1903B-2
MSK1903E-2
5962-9324302HX
MSK 1903-4
MSK 1903B-4
MSK1903E-4
MSK 1903-6
MSK 1903B-6
MSK1903E-6
+VHV
MAX
110V
110V
110V
110V
110V
110V
110V
110V
75V
75V
75V
130V
130V
130V
INTERNAL
RP
NONE
NONE
NONE
NONE
400Ω
400Ω
400Ω
400Ω
200Ω
200Ω
200Ω
400Ω
400Ω
400Ω
TYPICAL
RISE TIME
4.2nS
4.2nS
4.2nS
4.2nS
3.8nS
3.8nS
3.8nS
3.8nS
2.9nS
2.9nS
2.9nS
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 3/03