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ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP. FEATURES:
HIGH SPEED/HIGH VOLTAGE VIDEO DISPLAY DRIVER
1901
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
MIL-PRF-38534 QUALIFIED
Ultra Fast Rise Time - 2.8nS Typical Wide Bandwidth - 225 MHz Typical Variable Gain - 0 to 80 V/V On Board Reference Output 50 VPP Output Voltage Swing Blanking Capability User Adjustable Brightness and Contrast 25,000 V/Sec Slew Rate Available to DSCC SMD 5962-9324601HX
DESCRIPTION:
The MSK 1901 is a high performance, high voltage, variable gain video amplifier. The hybrid's open collector output is capable of directly driving a high resolution video display. The MSK 1901 features differential inputs and a linearly adjustable gain stage with an output offset adjustment which allows it to be a versatile performer well suited for many applications. A TTL level blanking input is available to set the output to a predetermined black level independent of signal output. The MSK 1901 is packaged in a hermetically sealed 24 pin quad flat pack with mounting flanges that can be conveniently connected to a heat sink.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Resolution Mono-Chrome Displays High Resolution RGB Displays High Speed, High Voltage Amplification for ATE
PIN-OUT INFORMATION
1 2 3 4 5 6 7 8 9 10 11 12 Ground Ground Ground Ground Blank VCC VEE VEE -Input +Input Ground VGAIN 13 14 15 16 17 18 19 20 21 22 23 24 VOFF VREF Ground Ground Ground Ground NC NC Output NC VCB VCB
1
Rev. A 5/02
ABSOLUTE MAXIMUM RATINGS

TC
-55C to +125C -40C to +85C
ELECTRICAL SPECIFICATIONS
Parameter STATIC Quiescent Current High Voltage Supply (WRT VCB) 2 Thermal Resistance 2 INPUT Input Bias Current Blank Input Current Offset Adjust Input Current Gain Adjust Input Current Blank Input Pulse Width 2 Common Mode Rejection Ratio Input Impedence Input Capacitance Blank Mode Input Rejection mA 2 Gain Adjust Rejection mA 2 Power Supply Rejection Ratio 2 OUTPUT Reference Output Voltage Output Current Blank Mode Output Current Min Offset Output Current Max Offset Transconductance Common Base Current Bandwidth 2 Transition Times 3 Linearity Error 2 Gain Linearity 2 Thermal Distortion 2 IOUT<2mA VBLANK=2.4V VOFF=1V VGAIN=0V VOFF=0V VGAIN=4V VOFF=5V VGAIN=0V VIN=0.6V F=10KHz VGAIN =5V Both Inputs VCM=0V VOFF=0V RL=50 VIN=0.6V VGAIN=4V TR=TF<1nS VOFF=1V VGAIN=1V VOFF=1V VCM=0.5V VOFF=1V VIN=0.2V VCM=0.5V 1,2,3 1,2,3 1,2,3 1,2,3 4 1,2,3 4 5.2 -2 0.5 80 395 200 5.5 0 10 100 500 30 225 2.8 5.8 2 25 120 605 40 4.5 2 2 2 V mA mA mA mS mA MHz nS %GS % %GS
2
Test Conditions
1
Group A Subgroup 1,2,3 1,2,3 1 2,3 1 1 1 1 Min. 20 30 10 25
MSK1901B Typ. 55 75 60 5 1 5 500 300 2 2 40 20 2 30 Max. 70 100 65 7 50 250 600 400 10 10 2 10 Units mA mA V C/W A A A A A A nS dB K pF mA mA dB
VCM=0V@+10V VCM=0V@-10.5V TC 125C Junction To Case
VCM=0V VBLANK=0.4V VBLANK=2.4V VOFF=1V VGAIN=5V Normal Operation VCM=0.5V F=10Hz Either Input F=DC Either Input VBLANK=2.4V VIN=0.3V VGAIN=5V +VCC and -VCC=Nom 5%
NOTES:
1 2 3 4 5 6 7 +VCC=+10V, -VEE=-10.5V, +VHV=+70V, VCB=+10V, VBLANK=0.4V, CL=6pF, RL=200, VGAIN=VOFF=VIN=0V unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Much faster rise times are obtainable without using test sockets. In addition, a peaking network may be used to improve overall bandwidth. 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 TC=+25C Subgroup 2,5 TC=+125C 2 Rev. Subgroup 3,6 TA=-55C
A 5/02

+VHV +VCC -VEE VCB VID VGAIN VOFF VBLANK IREF
High Voltage Supply (WRT VCB) Positive Supply Voltage Negative Supply Voltage Common Base Supply Voltage Differential Input Voltage Gain Adjust Input Voltage Offset Adjust Input Voltage Blank Input Voltage Reference Output Current
+65V +12V -12V +20V 2V -0.6V to +6V -0.6V to +6V -0.6V to +6V 5mA
TST TLD TJ PD
Storage Temperature Range Lead Temperature Range (Solder 10 Seconds) Junction Temperature Total Power Dissapation (TC=25C) Case Operating Temperature Range (MSK 1901B/E) (MSK1901)
-65C to +150C +300C +175C 13W
APPLICATION NOTES INITIAL SETUP
It is important to set the VOFF and VGAIN inputs to obtain balanced rise/fall times during initial setup of the MSK 1901. If the quiescent current level of VOFF is set too low, it will slow the rise time and limit the bandwidth of the MSK 1901.
BLACK LEVEL
The voltage developed across the external load resistor with a 0V video input to the MSK 1901 is the black level. This voltage may be changed by adjusting the load resistor or by varying the output quiescent current of the MSK 1901as described in VOFF above. The black level could also be affected by the VGAIN control voltage if the video input has a DC component. AC coupling of the video input will prevent this phenomenon from occuring.
VIDEO INPUTS
The analog inputs (VIN) are designed to accept RS343 signals, 0.714VPP, and will operate properly with a common mode range of 0.5V with respect to ground. Therefore, it is recommended that the input signal be limited to 1.3V with respect to ground, (signal+common mode). Although large offsets of 2V (with respect to ground, signal included) can be tolerated without damage to the hybrid, output linearity suffers and therefore it is not recommended.
BLANKING
The blank input is a TTL active high input. When active it will disable the video input of the MSK 1901 and allow the output to rise to approximately VLRS. If the blank input rises above 3V some interaction between VOFF and BLANK level may occur. The BLANK input is independent of the input signal and must be tied "low" to activate the amplifier if the blanking function is not used.
VGAIN
VGAIN is the DC gain (contrast) control which varies the gain from 0 to 80V/V. The internal reference (VREF) is available to drive this input. Normally a 5K potentiometer is connected between VREF and GND is used to vary the gain, but any 0-5V external DC source may be used with some additional degredation of gain stability over temperature. A 0.1F capacitor should be connected from the VGAIN pin to ground to improve stability. The gain equation for the MSK 1901 is: VLRS-VO=VIN x GM x RL =VIN (VGAIN x 0.08) RL The overall gain of the MSK 1901 may vary by 20% due to process variations of the internal components. Temperature variations also effect gain, <150ppm/C. If more than one MSK 1901 is used in a system, steps should be taken to make them track thermally (i.e. a common heat sink). This will reduce any mismatches due to varying temperatures.
VREF OUTPUT
VREF is a buffered zener reference with a nominal output voltage of 5.5V 5% which can source up to 4mA. It is available for use in adjusting the offset and gain. If multiple amplifiers are used for RGB amplification, they should all share the same VREF pin from one of the hybrids. The VREF pin should be buffered with a unity gain precise amplifier when driving three amplifiers for RGB applications.
VCB
The VCB input is the base connection to the output stage consisting of a common base, high voltage stage and a high speed, low voltage current amplifier in a cascode arrangement. This input requires a very stable 10V DC nominal voltage. Any AC signals at this point will be amplified and reflected in the output. The PSRR of the output stage is directly related to the stability of this VCB voltage.
VIDEO OUTPUT
The video output voltage is obtained from the open collector of a cascode circuit designed to operate with a nominal output supply (VLRS) of +70V. VLRS must be greater than the applied VCB voltage, but less than VCB +65V. The output of MSK 1901 will drive loads up to 250mA when proper heat sinking is used.
VOFF
VOFF is the output offset (brightness) control used to set the output quiescent current and consequently the DC output voltage (black level). Output quiescent current adjustment range is from several A to 100mA nominal (80 to 130mA actual). Normally a 5K potentiometer is connected between VREF and GND to this input, but any 0-5V external DC source may be used. A 0.1F capacitor should be connected from this pin to signal ground to improve the amplifier's stability.
3
Rev. A 5/02
APPLICATION NOTES CON'T OUTPUT CONNECTIONS
In applying the MSK 1901 in a system, two challenges present themselves. The first challenge is to minimize any stray capacitance from the output pin to ground. Since the output connection is extremely susceptible to capacitance loading, the elimination of ground planes adjacent to the output and resistive load are important or the rise and fall times will be limited. Keep output connections as short as possible and insure that any ground plane is at least one inch from the output signal. The second challenge is to provide a very low impedence connection between two sets of ground pins (1, 2, 3, 4 and 15, 16, 17, 18). If mounting permits, the best solution is to run a board ground track under the MSK 1901 connecting the adjacent ground pins. However, the standard practice of heat sinking the MSK 1901 directly to the CRT chassis usually precludes this. A cutout is usually provided in the PC board where the MSK 1901 is surface mounted on the opposite side from the other components. Two suggestions for this surface mounting technique to improve performance are directed at functionality or speed. A functional solution is to run a ground trace on the output pin side of the hybrid on the back side of the PC board. The trace should be 0.1 to 0.2 inch necking down to 0.1 inch as it perpendicularly crosses the output trace on the other side of the board. This results in added capacitance of only 0.1 to 0.4 pF. A high speed solution is to have the ground cross the input pin side of the hybrid. To counter the signal ground disruption, the signal ground (pin 11) is internally connected to the (15, 16, 17, 18) grounds. Use as broad a ground trace as possible to improve stability. A third suggestion is to buffer the MSK 1901 using a differential follower stage. This configuration as shown in Figure 1 below allows an easier layout which minimizes stray capacitance. The rise time is essentially limited by the capacitance of the output transistor and that of Q1 and Q2.
POWER SUPPLIES
A +10V and a -10.5V power supply are required for proper operation. These supplies can be set at 12V for convenience but this will increase the internal power dissipation and package case temperature. VLRS can be any voltage above VCB but not greater than VCB +65V. To achieve maximum performance good high frequency grounding practices and PC board layout are essential. Proper power supply decoupling is also essential for stability and good video performance. Place bypass capacitors as close to power supply pins as possible. Refer to the typical connection circuit for recommended connections.
POWER SUPPLY SEQUENCING
Power supply sequencing is necessary to avoid internal latch-up of the hybrid. External diodes should be placed (anode to cathode) from VEE to GND, from GND to VCC and from VCC to VLRS. If power supply sequencing is not possible, all supplies should be applied to the hybrid within 5 mS of each other.
POWER DISSIPATION
The MSK 1901 power dissipation will vary depending on load requirements and speed. The quad flat pack of the hybrid is designed to provide a low thermal resistance path from the hybrid circuit to an external heat sink. Mounting flanges provide for excellent mechanical and thermal attachment of the package to the heat sink. In addition, the package is electrically isolated so that mounting insulators are not needed and the heat sink can be at any convenient potential. Refer to the following table for typical power levels for selected video conditions:
POWER DISSIPATION TABLE
(TC=25C, VLRS=70V, RL=200) IC PD Watts 1.6 7.8 6.5 5.6 PLOAD Watts 0 6.1 4.9 10 Duty VO -VBLACK Cycle % 0 0 35 100 35 80 50 80 TOTAL PD Watts 1.6 13.9 11.4 15.6
Figure 1 4
When using multiple MSK 1901's, attach all devices to a common heat sink (e.g. in a RGB system). This allows close thermal tracking between hybrids and improves color balance with varying input drive and ambient temperature conditions. Common thermal tracking of the devices reduces timing and other errors found in RGB systems. Rev. A 5/02
TYPICAL CONNECTION CIRCUIT
The connection circuit shown above is for the MSK 1901. The RL 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 FP10-200 is reqired for optimum response times. Use an inductor with a high self-resonant frequency that can withstand the currents required for the application. The ferrite beads should be located as close to the DUT as possible. Fare-Rite Corporation P/N 2743001111 beads work well for most applications. For additional applications information, please contact MSK. Evaluation amplifiers with test boards are readily available upon request. NOTES:
5
Rev. A 5/02
MECHANICAL SPECIFICATIONS
MSK1901
ESD TRIANGLE INDICATES PIN 1. ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part Number
MSK1901 MSK1901B MSK1901E 5962-9324601HX
Screening Level
Industrial Military-Mil-PRF-38534 Class H Extended Reliability DSCC-SMD
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.
M.S. Kennedy Corp.
5
Rev. A 5/02

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