MSK MSK1900

ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
HIGH PERFORMANCE,
HIGH VOLTAGE
VIDEO DISPLAY DRIVER
1900
8170 Thompson Road Cicero, N.Y. 13039
(315) 699-9201
FEATURES:
Ultra Fast Rise Time - 2.8nS Typical
Wide Bandwidth - 200 MHz Typical
Variable Gain - 0 to 100 V/V
On Board Reference Output
50 Vpp Output Voltage Swing
Blanking Capability
User Adjustable Brightness and Contrast
25,000 V/µSec Slew Rate
Replaces TP1900 And Max 445
DESCRIPTION:
The MSK 1900 is a high performance, high voltage, variable gain video amplifier capable of directly driving high resolution video displays. The MSK 1900 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 input. The MSK 1900 is packaged in a cost
effective, 24 pin power dip which can be bolted directly to a heat sink for efficient thermal management.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
High Resolution Mono-Chrome Displays
High Resolution RGB Displays
High Speed, High Voltage Amplification for ATE
Ground
VREF
VOFF
VGAIN
Ground
+Input
-Input
VEE
9
10
11
12
13
14
15
16
VEE
VCC
Blank
Ground
Ground
Ground
Ground
VCB
17
18
19
20
21
22
23
24
VCB
N/C
Output
VEE
VEE
Ground
Ground
Ground
NOTE: All pins must be connected for proper operation if
labeled.
1
Rev. B
9/99
ABSOLUTE MAXIMUM RATINGS
+VHV
+VCC
-VEE
VID
VGAIN
VOFF
VBLANK
VCB
High Voltage Supply(WRT VCB)
Positive Supply Voltage
Negative Supply Voltage
Differential Input Voltage
Gain Adjust Input Voltage
Offset Adjust Input Voltage
Blank Input Voltage
Common Base Supply
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TST Storage Temperature Range
TLD Lead Temperature Range
(Solder 10 Seconds)
TJ Junction Temperature
TC Case Operating Temperature
MSK 1900
OJC Thermal Resistance
(Junction to Case)
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+65V
+12V
-12V
2V
-0.6V to +6V
-0.6V to +6V
-0.6V to +6V
20V
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ELECTRICAL SPECIFICATIONS
Parameter
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-25°C to +150°C
+300°C
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+150°C
0°C to +70°C
7.5°C/W
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Tc=25°C unless otherwise specified
Test Conditions
1
MSK 1900
Units
Min.
Typ.
Max.
VCM=0V@+10V
-
55
70
mA
[email protected]
-
-75
-100
mA
WRT VCBB
20
60
65
V
-
8
10
°C/W
±1
±50
µA
STATIC
Quiescent Current
HIgh Voltage Supply 2
Thermal Resistance to Case 2
INPUT
Input Bias Current 2
VCM=0V
-
Common Base Current 2
VCB=10V
-
30
40
mA
VBLANK=0.4V
-
500
600
µA
VBLANK=2.4V
-
300
400
µA
Offset Adjust Input Current 2
VOFF=1V
-
2
10
µA
Gain Adjust Input Current 2
VGAIN=5V
-
2
10
µA
Normal Operation
30
-
-
nS
VCM=±0.5V F=10Hz
-
40
-
dB
Either Input F=DC
10K
20K
-
Ω
Either Input
-
2
-
pF
VBLANK=2.4V VIN=0.3V
-
-
±0.4
V
∆V GAIN=5V
-
-
±2.0
V
+VCC and -Vee=Nom ±5%
25
30
-
dB
IOUT<2mA
5.2
5.5
5.8
V
Output Current Blank Mode
VBLANK=2.4V VOFF=1V VGAIN=0V
-3
0
+3
mA
Output Current (Min Offset)
VOFF=0V VGAIN=5V
0.5
10
25
mA
Output Current (Max Offset)
VOFF=5V VGAIN=0V
80
100
120
mA
VIN=0.6V F=10KHz VGAIN=5V Either Input
80
100
120
V/V
VOFF=0V
-
225
-
MHz
VGAIN=3V TR=TF<0.5nS VOFF=1V
-
2.8
-
nS
VGAIN=1V VOFF=1V VCM=0.5V
-
-
±2
%GS
VOFF=1V VIN=0.2V VCM=0.5V
-
-
±2
%
-
-
±2
%GS
Blank Input Current 2
Blank Input Pulse Width 2
Common Mode Rejection Ratio 2
Input Impedance 2
Input Capacitance 2
Blank Mode Input Rejection ∆V 2 4
Gain Adjust Rejection ∆V 2 4
Power Supply Rejection Ratio 2
OUTPUT
Reference Output Voltage
Voltage Gain (Rp=200Ω)
Bandwidth
2 3
Transition Times 2 3
Linearity Error
2
Gain Linearity 2
Thermal Distortion 2
NOTES:
1 +VCC = +10V, -VEE = -10.5V, +VHV = +70V, VCB = +10V, VBLANK = 0.4V, CL = 6pF, Rp = 200Ω, VGAIN = VOFF = ±VIN = 0V unless otherwise
specified.
2 Parameters shall be guaranteed by design if not tested. Typical parameters are representative of actual device performance but are for reference only.
3 Faster rise times are obtained without using test sockets. In addition, a peaking network must be used to achieve best performance.
4 Output voltage ∆V is the difference between +VHV and VOUT.
2
Rev. B
9/99
APPLICATION NOTES
POWER SUPPLIES
VIDEO INPUTS
The input stage of the MSK 1900 requires power supplies of
+10V 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 sould be effectively
decoupled with tantalum capacitors (at least 1µF) connected as
close to the amplifiers pins as possible. The MSK 1900 has
internal 0.01µF capacitors that also improve high frequency performance. Additionally, it is also recommended to put 0.1µF
decoupling capacitors on the +10V and -10.5V supplies as
well.
The analog inputs (±VIN) are designed to accept RS343
signals, ±0.714VPP, and 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.
OUTPUT PROTECTION
The output pin of the MSK 1900 can 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
(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
amplifiers output stage and must be kept as stable as possible.
The internal Rp is connected to +VHV and as such, the amplifiers DC output is directly related to the high voltage value. The
+VHV pin of the hybrid should be decoupled to ground with as
large a capacitor as possible to improve output stability.
VGAIN CONTROL INPUT
VCB
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 100V/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.
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.
SUPPLY SEQUENCING
The overall video output of the MSK 1900 can be characterized using the following expression:
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 off.
Vpp=VHV-VOUT
VHV-VOUT=(VIN)(VGAIN)(Rp)(0.08)
Here is a sample calculation for the MSK1900:
Given information
VIN=0.7V
VGAIN=1VDC
Rp=200Ω (external)
VHV=70VDC
VHV-VOUT=(0.7V)(1V)(.08)(200Ω)
VHV-VOUT=11.2Vpp Nominal
VIDEO OUTPUT
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 bandwidth of the amplifier largely depends
on both Rp and Lp. With +VHV set to +70V and total
Rp=200Ω, the device is capable of approximately 62Vpp total
output swing.
The expected video output would swing from approximately
+70V to +58.8V assuming that VOFF=0V. This calculation
should be used as a nominal result because the overall gain may
vary as much as ±10% due to internal high speed device variations. Changing ambient conditions can also effect the video
gain of the amplifier slightly. 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 1900 is conservatively specified with low values
for external Lp which yield about 5% overshoot. Additional
peaking can be obtained by using a high self-resonant frequency
inductor in series with +VHV pin. 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 1900.
3
Rev. B
9/99
APPLICATION NOTES CON'T
VOFF
BLANK INPUT
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 µA to 100mA nominal (80 to 130 mA actual).
Normally a 5K potentiometer is connected between VREF and
GND to this input, but any 0 - 5.5V external DC source may be
used. A 0.1µF capacitor should be connected from this pin to
signal ground to improve the amplifier's stability.
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.
VREF OUTPUT
THERMAL MANAGEMENT
The MSK 1900 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.
The MSK 1900 package is electrically isolated from the internal circuitry, allowing direct connection to a heat sink.
The power dissipation of the amplifier depends mainly on
the load requirements, bandwidth, pixel size, black level and the
value of the external Rp. Refer to the following table for typical
power levels for selected video conditions:
POWER DISSIPATION TABLE
Ω)
(TC = 25°C, VHV = 70V, RP = 200Ω
BLACK LEVEL
The voltage developed across the external load resistor with a
0V video input to the MSK 1900 is the black level. This voltage
may be changed by adjusting the load resistor or by varying the
output quiescent current of the MSK 1900 as described in VOFF
above. The black level could also be effected by the VGAIN control voltage if the video input has a DC component. AC coupling
of the video input will prevent this phenomenon from occurring.
VO - VBLACK
4
Duty
Cycle %
IC PD
Watts
PLOAD
Watts
TOTAL
PD Watts
1.6
0
0
1.6
0
35
100
7.8
6.1
13.9
35
80
6.5
4.9
11.4
50
80
5.6
10
15.6
Rev. B
9/99
TYPICAL CONNECTION CIRCUIT
The connections shown above are for the MSK 1900 evaluation board. +Vcc should be connected to VCB through a
20Ω resister with a 15pF capacitor to ground. This will help to filter power supply noise and provide a stable voltage at VCB.
RP is an external component and must not be located near ground planes if possible. A high quality resistor such as Bradford
Electronics P/N FP10-200 is required for optimum response times.
5
Rev. B
9/99
MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE ±.010 INCHES UNLESS OTHERWISE LABELED
ORDERING INFORMATION
Part
Number
Screening Level
MSK1900
Industrial
M.S. Kennedy Corp.
8170 Thompson Rd., Cicero, New York 13039-9393
Tel. (315) 699-9201
FAX (315) 699-8023
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.
6
Rev. B
9/99