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EL4450C 데이터시트 PDF




Elantec Semiconductor에서 제조한 전자 부품 EL4450C은 전자 산업 및 응용 분야에서
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부품번호 EL4450C 기능
기능 Wideband Four-Quadrant Multiplier
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EL4450C 데이터시트, 핀배열, 회로
EL4450C
Wideband Four-Quadrant Multiplier
Features
• Complete four-quadrant multiplier
with output amp—requires no
extra components
• Good linearity of 0.3%
• 90 MHz bandwidth for both X and
Y inputs
• Operates on ±5V to ±15V supplies
• All inputs are differential
• 400V/µs slew rate
Applications
• Modulation/Demodulation
• RMS computation
• Real-time power computation
• Nonlinearity correction/generation
Ordering Information
Part No.
EL4450CN
EL4450CS
Temp. Range
-40°C to +85°C
-40°C to +85°C
Package
14-Pin P-DIP
14-Lead SO
Outline #
MDP0031
MDP0027
General Description
The EL4450C is a complete four-quadrant multiplier circuit. It offers
wide bandwidth and good linearity while including a powerful output
voltage amplifier, drawing modest supply current.
The EL4450C operates on ±5V supplies and has an analog input range
of ±2V, making it ideal for video signal processing. AC characteristics
do not vary over the ±5V to ±15V supply range.
The multiplier has an operational temperature range of -40°C to
+85°C and are packaged in plastic 14-pin P-DIP and SO.
Connection Diagrams
© 1995 Elantec, Inc.




EL4450C pdf, 반도체, 판매, 대치품
EL4450C
Wideband Four-Quadrant Multiplier
Frequency Response
for Various Feedback
Divider Ratios
Frequency Response
for Various RL, CL
VS = ±5V
Frequency Response
for Various RL, CL
VS = ±15V
X Input Frequency Response
for Various Y DC Inputs
Y Input Frequency Response
for Various X DC Inputs
-3 dB Bandwidth
and Peaking
vs Supply Voltage
Change in Bandwidth
and Peaking vs Temperature
Total Harmonic Distortion
of X Input vs Frequency
Total Harmonic Distortion
of Y Input vs Frequency
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EL4450C 전자부품, 판매, 대치품
EL4450C
Wideband Four-Quadrant Multiplier
Applications Information
The EL4450 is a complete four-quadrant multiplier with
90 MHz bandwidth. It has three sets of inputs; a differ-
ential multiplying X-input, a differential multiplying Y-
input, and another differential input which is used to
complete a feedback loop with the output. Here is a typ-
ical connection:
Figure 1.
The gain of the feedback divider is H, and H = RG/(RG +
RF). The transfer function of the part is
VOUT = AO × (1/2 × ((VINX+–VINX-) × (VINY+–VINY-)) + (VREF–VFB)).
VFB is connected to VOUT through a feedback network,
so VFB = H*VOUT. AO is the open-loop gain of the
amplifier, and is about 600. The large value of AO drives
(1/2 × ((VINX+–VINX-) × (VINY+–VINY-)) + (VREF–VFB))0.
Rearranging and substituting for VREF
VOUT = (1/2 × ((VINX+–VINX-) × (VINY+–VINY-)) +VREF)/H, or
VOUT = (XY/2 + VREF)/H
Thus the output is equal to one-half the product of X and
Y inputs and offset by VREF, all gained up by the feed-
back divider ratio. The EL4450 is stable for a direct
connection between VOUT and FB, and the feedback
divider may be used for higher output gain, although
with the traditional loss of bandwidth.
It is important to keep the feedback divider’s impedance
at the FB terminal low so that stray capacitance does not
diminish the loop’s phase margin. The pole caused by
the parallel impedance of the feedback resistors and
stray capacitance should be at least 150 MHz; typical
strays
of 3 pF thus require a feedback impedance of 360¾ or
less, Alternatively, a small capacitor across RF can be
used to create more of a frequency-compensated divider.
The value of the capacitor should scale with the parasitic
capacitance at the FB input. It is also practical to place
small capacitors across both the feedback resistors
(whose values maintain the desired gain) to swamp out
parasitics. For instance, two 10 pF capacitors across
equal divider resistors for a maximum gain of 1 will
dominate parasitic effects and allow a higher divider
resistance.
The REF pin can be used as the output’s ground refer-
ence, or for DC offsetting of the output, or it can be used
to sum in another signal.
Input Connections
The input transistors can be driven from resistive and
capacitive sources, but are capable of oscillation when
presented with an inductive input. It takes about 80 nH
of series inductance to make the inputs actually oscillate,
equivalent to four inches of unshielded wiring or about 6
of unterminated input transmission line. The oscillation
has a characteristic frequency of 500 MHz. Placing
one’s finger (via a metal probe) or an oscilloscope probe
on the input will kill the oscillation. Normal high-fre-
quency construction obviates any such problems, where
the input source is reasonably close to the input. If this is
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