MSK1922 [MSK]
ULTRA HIGH SPEED/VOLTAGE VIDEO AMPLIFIER; 超高速/电压视频放大器
| 型号： | MSK1922 |
| 厂家： | 
M.S. KENNEDY CORPORATION |
| 描述： | ULTRA HIGH SPEED/VOLTAGE VIDEO AMPLIFIER |
| 文件： | 总6页 (文件大小：233K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISO-9001 CERTIFIED BY DSCC
ULTRA HIGH SPEED/VOLTAGE
1922
SERIES
VIDEO AMPLIFIER
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
MIL-PRF-38534 CERTIFIED
Ultra High Performance Complete Amplifier System
50Vpp Output Signal Into 10pF
Ultra Fast Transition Times: 1.5nS @ 50Vpp
User Adjustable Contrast and Brightness
TTL Compatible Blanking
On Board DC Reference Output
Customized Versions Readily Available
DESCRIPTION:
The MSK 1922 High Speed, High Voltage Video Amplifier is designed to directly drive the cathode of today's high
performance CRT's. The MSK 1922 has user adjustable contrast and brightness levels and also comes with a
blanking function. The MSK 1922 can be directly connected to many video sources including RS170, RS343 and high
speed video D/A converters. The MSK 1922 has an internal resistor-inductor designed for optimum bandwith. The
MSK 1922 is packaged in a hermetic 30 pin power flatpack that can be directly connected to a heat sink using
standard 4-40 screws.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
GND
VHV
NC
Output
NC
Cath. RTN/GND
VCC
VCC
GND
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11 VGAIN
12 VOFF
13 VREF
14 GND
15 GND
16 VHV RES
17 VHV RES
18 GND
19 GND
20 VHV
Helmet Mounted Displays
High Resolution RGB Displays
High Resolution Monochrome Displays
Automatic Test Equipment
Medical Monitors
GND
Blank
VEE
VEE
VEE
-Input
+Input
GND
GND
CAE/CAD Station Monitors
GND
GND
1
Rev. D 4/02
ABSOLUTE MAXIMUM RATINGS
+VHV
VCC
VEE
VBLANK
IREF
High Voltage Supply
+75V
+17V
-12V
-0.6 to +6V
5mA
-40°C to +150°C
300°C
Blank Input Voltage
Positive Supply Voltage
Negative Supply Voltage
Differential Input Voltage
Common Mode Input Voltage
Gain Adjust Input Voltage
Offset Adjust Input Voltage
Reference Output Current
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Junction Temperature
Current Through Rp
Case Operating Temperature
TST
VIN
TLD
2V
2V
VIC
VGAIN
VOFF
TJ
IRP
TC
-0.6 to +6V
-0.6 to +6V
175°C
290mA
-40°C to +125°C
ELECTRICAL SPECIFICATIONS
MSK1922
1
Test Conditions
Parameter
Units
Min.
Max.
Typ.
STATIC
VCM=0V @ +15V
VCM=0V @ -10.5V
-
-
100
-100
75
mA
mA
75
-75
70
24
4
Quiescent Current
2
High Voltage Supply
30
-
V
QOUT and QCAS
Thermal Resistance to Case
2
26
°C/W
INPUT
VCM=0V
VBLANK=0.4V
2
Input Bias Current
Blank Input Current
-
50
µA
µA
µA
µA
µA
nS
dB
Ω
1
500
300
2
-
600
2
VBLANK=2.4V
-
400
VOFF=1V
Offset Adjust Input Current
Gain Adjust Input Current
2
-
10
VGAIN=5V
2
-
30
-
10
2
Normal Operation
VCM= 0.5V F=10Hz
Either Input F=DC
Either Input
Blank Input Pulse Width
Common Mode Rejection Ratio 2
2
-
-
-
-
-
40
20K
2
Input Impedance
Input Capacitance
Blank Mode Input
2
10K
-
2
pF
VBLANK=2.4V VIN=0.3V
∆V=VHV-VOUT
∆VGAIN=5V
-
mV
-
2xRp
Rejection ∆V
Gain Adjust Rejection ∆V
Power Supply Rejection Ratio
2
3
2
3
2
-
mV
dB
Ω
-
10xRp
-
+VCC and -VEE=Nom 5ꢀ
25
30
2
3
Internal Rp
140
160
150
OUTPUT
IOUT<2mA
Reference Output Voltage
4
5.2
5.8
V
5.5
Rp
∆V=VHV-VOUT VOFF=1V
VBLANK=2.4V VGAIN=5V
∆V=VHV-VOUT VOFF=0V VGAIN=3V
∆V=VHV-VOUT VOFF=5V
VIN=0.6V F=10KHz
∆V Blank Mode
3
-3xRp
3xRp
mV
∆V Min Offset
∆V Max Offset
3
0
6
V
V
2
3
11
21
16
4
Voltage Gain
54
64
40
V/V
VGAIN=4V Both Inputs
VGAIN=4V F=10KHz
Output Voltage High
Output Voltage Low
4
4
65
-
20
-
V
V
68
10
1.5
-
VGAIN=4V F=10KHz
-
-
-
-
-
VIN=0.6V TR=TF<0.2nS (input)
VGAIN =4V VOFF=1V VCM=0.5V
VOFF=1V VIN=2.0V VCM=0.5V
Transition Times
2
nS
Linearity Error
Gain Linearity
2
2
ꢀGS
ꢀ
2
2
-
2
Thermal Distortion
2
ꢀGS
-
NOTES:
1 +VCC = +15V, -VEE = -10.5V, VBLANK = VGAIN = VOFF = VIN = 0V, CL=10pF, TC=25°C unless otherwise specified.
2 This parameter is guaranteed by design but need not be tested. Typical parameters are representative of actual device performance but are for reference only.
3 ∆V is defined as the difference between +VHV and the output.
4 Parameter is 100ꢀ tested on production devices.
2
Rev. D 4/02
APPLICATION NOTES
POWER SUPPLIES
VIDEO INPUTS
The video input signals should be kept below 2VMAX total,
including both common mode offset and signal levels. The
input structure of the MSK 1922 was designed for 0.714Vpp
RS343 signals. If either input is not used it should be con-
nected 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 1922 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 1922 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 1922 should be protected from
transients by connecting reversed 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 (25-50Ω) resistor in series with the amplifier. This
resistor will reduce system bandwidth along with the load ca-
pacitance, but a series inductor can reduce the problem sub-
stantially.
The high voltage power supply (+VHV) is connected to the
amplifier's output stage and must be kept as stable as possible.
The internal 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 73V/V. The VGAIN input should be connected to the VREF pin
through a 5KΩ pot to ground. For convenient stable gain adjust-
ment, 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 track-
ing performance may be lost when using an external DC voltage
source other than VREF for gain adjustment. The bandwidth of
the VGAIN input is approximately 1MHz.
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 1922 can be character-
ized using the following expression:
Vpp=VHV-VOUT
VIDEO OUTPUT
VHV-VOUT=(VIN)(VGAIN)(Rp)(0.09)
(or)
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 the
MSK 1922 is determined by (Rp). The bandwidth of the ampli-
fier largely depends on both Rp and Lp.
Voltage Gain=VOUT/VIN=(VGAIN)(Rp)(0.09)
Here is a sample calculation for the MSK 1922:
Given information
VIN=0.7V
Hybrid pins 16 and 17 are directly connected to Rp. Addi-
tional external resistance can be added to reduce power dissi-
pation, but slower transition times will result. If an additional
resistor is used, it must be low capacitance and the layout
should minimize capacitive coupling to ground (ie: no ground
plane under Rp).
VGAIN=1VDC
Rp=150Ω (internal)
VHV=70VDC
VHV-VOUT=(0.7V)(1V)(150Ω)(0.09)
VHV-VOUT=9.5V Nominal
The expected video output would swing from approximately
+70V to +60.5 V 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 varia-
tions. 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 applica-
tions 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 1922 is specified with no external Lp which yields
about 10% overshoot. Additional peaking can be obtained by
using a high self-resonant frequency inductor in series with pins
16 & 17. Since this value of inductance can be very dependent
on circuit layout, it is best to determine its value by experimen-
tation. A good starting point is typically 0.0047µH.
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. D 4/02
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 potenti-
ometer 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 bandwidth of the VOFF pin is approximately
1MHz.
The video input can be electrically disconnected from the
ampliifer 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 out-
put 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.
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 obvi-
ously dependent on system requirements but a little experi-
mentation will strike the optimum balance between power dis-
sipation and bandwidth. The gain adjust alone can set the AC
current to 333mA (ie: 333mApp=50Vpp/150Ω). Typically,
most applications use about 5V from +VHV for a black level.
The MSK 1922 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 1922 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.
The power dissipation of the amplifier depends mainly on the
load requirements, bandwidth, pixel size, black level and the
value of Rp.
RESOLUTION TABLE FOR TYPICAL CRT'S
Maximun
Pixel
Minimum Pixel
Clock
Required Rise Time
at CRT
Required System
Bandwidth
(F-3dB)
Display
Resolution
Time
Frequency
Cathode
320 x 200
640 x 350
182nS
52nS
5MHz
19MHz
26MHz
38MHz
80MHz
90MHz
112MHz
170MHz
360MHz
1.2GHz
60nS
17nS
6MHz
20MHz
28MHz
41MHz
84MHz
95MHz
120MHz
180MHz
380MHz
1.23GHz
640 x 480
38nS
12.5nS
8.6nS
4.2nS
3.7nS
2.9nS
1.9nS
1nS
800 x 560
26nS
1024 x 900
1024 x 1024
1280 x 1024
1664 x 1200
2048 x 2048
4096 x 3300
12.6nS
11nS
8.9nS
5.8nS
2.8nS
860pS
280pS
All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate.
4
Rev. D 4/02
TYPICAL CONNECTION CIRCUIT
The connection circuit shown above is for the MSK 1922 evaluation board.
For additional applications information, please contact the factory. Evaluation amplifiers with test boards are
readily available from MSK.
NOTES:
5
Rev. D 4/02
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1.
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
PART
SCREENING LEVEL
NUMBER
MSK 1922
Industrial
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.
Rev. D 4/02
6
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