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參數(shù)資料
| 型號(hào)： | MSK1922 |
| 廠商： | MS KENNEDY CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Ultra High Speed /Voltage Video Amplifier(超高速/高電壓直流參考輸出的視頻放大器) |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, DFM30 |
| 封裝： | HERMETIC SEALED, DFP-30 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大小： | 231K |
| 代理商： | MSK1922 |
APPLICATION NOTES
POWER SUPPLIES
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.
The high voltage power supply (+V
HV
) is connected to the
amplifier's output stage and must be kept as stable as possible.
The internal Rp is connected to +V
HV
and as such, the amplifier's
DC output is directly related to the high voltage value. The
+V
HV
pins of the hybrid should be decoupled to ground with as
large a capacitor as possible to improve output stability.
SUPPLY SEQUENCING
The power supply sequence is V
HV
, V
CC
, V
EE
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 V
REF
output, reverse biased diodes should be connected from each
input (V
GAIN
, V
OFF
) to the V
CC
pin. This will protect the inputs
until V
CC
is turned on.
VIDEO OUTPUT
When power is first applied and V
IN
=V
GAIN
=V
OFF
=0V, the
output will be practically at the +V
HV
rail voltage. The output
voltage is a function of the value of Rp and also the V
GAIN
and
V
OFF
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.
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).
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.
Rev. C 8/00
3
The V
GAIN
control (contrast) input is designed to allow the
user to vary the video gain. By simply applying a DC voltage
from 0V to V
REF
, the video gain can be linearly adjusted from 0
to 73V/V. The V
GAIN
input should be connected to the V
REF
pin
through a 5K
pot to ground. For convenient stable gain adjust-
ment, a 0.1μF bypass capacitor should be connected near the
V
GAIN
input pin to prevent output instability due to noisy sources.
Digital gain control can be accomplished by connecting a D/A
converter to the V
GAIN
pin. However, some temperature track-
ing performance may be lost when using an external DC voltage
source other than V
REF
for gain adjustment. The bandwidth of
the V
GAIN
input is approximately 1MHz.
The overall video output of the MSK 1922 can be character-
ized using the following expression:
Vpp=V
HV
-V
OUT
V
HV
-V
OUT
=(V
IN
)(V
GAIN
)(Rp)(0.09)
(or)
Voltage Gain=V
OUT
/V
IN
=(V
GAIN
)(Rp)(0.09)
Here is a sample calculation for the MSK 1922:
Given information
V
IN
=0.7V
V
GAIN
=1VDC
Rp=150
(internal)
V
HV
=70VDC
V
HV
-V
OUT
=(0.7V)(1V)(150
)(0.09)
V
HV
-V
OUT
=9.5V Nominal
The expected video output would swing from approximately
+70V to +60.5 V assuming that V
OFF
=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 V
REF
outputs should be shared by all three amplifiers. This voltage
should be buffered with a suitable low drift op-amp for best
tracking performance.
V
GAIN
CONTROL INPUT
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 +V
HV
and ground. The
output can also be protected from arc voltages by inserting a
small value (25-50
) 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.
VIDEO INPUTS
The video input signals should be kept below ±2V
MAX
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 25
resistor
to ground if input offset currents are to be minimized.
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| MSK1932D-6 | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:ULTRA HIGH SPEED/VOLTAGE VIDEO AMPLIFIER |
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