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参数资料
| 型号： | 5962-8997202HXA |
| 厂商： | MS KENNEDY CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, DFM30 |
| 封装： | DFP-30 |
| 文件页数： | 3/6页 |
| 文件大小： | 252K |
| 代理商： | 5962-8997202HXA |
APPLICATION NOTES
POWER SUPPLIES
The input stage of the MSK 1902 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 4.7F) connected
as close to the amplifier's pins as possible. The MSK 1902 has
internal 0.01F capacitors that also improve high frequency
performance. In any case, it is also recommended to put 0.1F
decoupling capacitors on the +15V and -10.5V supplies as
well.
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.
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 maximum output voltage swing for any of
the MSK 1902 variants is determined by Vpp = (250mA) x
(Rp). The bandwidth of the amplifier 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 capacitive and the layout should
minimize capacitive coupling to ground (ie: no ground plane
under Rp).
The MSK 1902 series is conservatively specified with low
values for Lp which yield about 5% overshoot. Additional peak-
ing can be obtained by using a high self-resonant frequency
inductor in series with the Rp pins. Since this value of induc-
tance can be very dependent on circuit layout, it is best to
determine its value by experimentation. A good starting point
is typically 0.47H for the MSK 1902-0 and 0.0047H 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.
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 5K
pot to ground. For convenient stable gain adjust-
ment, a 0.1F 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 overall video output of the MSK 1902 can be character-
ized using the following expression:
Vpp=VHV-VOUT
VHV-VOUT=(VIN) (VGAIN) (0.1) (Rp) (0.9)
Here is a sample calculation for the MSK 1902-2:
Given information:
VIN=0.7V
VGAIN=1VDC
Rp=400
(internal)
VHV=100VDC
VHV-VOUT=(0.7V) (1V) (0.1) (400
) (0.9)
VHV-VOUT=25.2V Nominal
The expected video output would swing from approximately
+100V to +74.8V 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 varia-
tions. Changing ambient conditions can also affect 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.
VGAIN CONTROL INPUT
OUTPUT PROTECTION
The output pin of the MSK 1902 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 (50-100
) resistor in series with the amplifier out-
put. This resistor will reduce system bandwidth along with the
load capacitance, but a series inductor can reduce the problem
substantially.
VIDEO INPUTS
The video input signals should be kept below ±2VMAX total,
including both common mode offset and signal levels. The in-
put structure of the MSK 1902 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.
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.
Rev. B 2/03
3
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