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Número de pieza CLC427AJ
Descripción Dual Voltage Feedback Amplifier for Single Supply Operation
Fabricantes National Semiconductor 
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N
Comlinear CLC427
Dual Voltage Feedback Amplifier
for Single Supply Operation
General Description
The Comlinear CLC427 is a dual wideband voltage-feedback
operational amplifier that is uniquely designed to provide high
performance from a single power supply. This CLC427 provides
near rail-to-rail operation and the common-mode input range
includes the negative rail. Each of the CLC427’s amplifiers offers
plenty of headroom for single-supply applications as evidenced
by its 4.3Vpp output voltage from a single 5V supply.
Fabricated with a high-speed complementary bipolar process,
the CLC427 delivers a wide 94MHz unity-gain bandwidth, 7.5ns
rise/fall time and 150V/µs slew rate. For single supply applications
such as video distribution or desktop multimedia, the CLC427
offers low 0.35%, 0.55° differential gain and phase errors.
Each of the CLC427’s amplifiers provides high signal fidelity
with -74/-94dBc 2nd/3rd harmonics (1Vpp, 1MHz, RL=150).
Combining this high fidelity performance with CLC427’s quick
46ns settling time to 0.1% makes it an excellent choice for ADC
buffering.
With its traditional voltage-feedback architecture and high-speed
performance, the CLC427 is the perfect choice for composite
signal conditioning circuit functions such as active filters,
integrators, differentiators, simple gain blocks and buffering.
August 1996
Features
s Single +5V supply
s Input includes VEE
s 94MHz unity-gain bandwidth
s -74/-94dBc HD2/HD3
s 60mA output current
s 7.5ns rise/fall time (1Vpp)
s 46ns settling time to 0.1%
Applications
s Video ADC driver
s Desktop multimedia
s Single supply cable driver
s Instrumentation
s Video cards
s Wireless IF amplifiers
s Telecommunications
Frequency Response vs. Vout
Av = +2V/V
1Vpp
2Vpp
4Vpp
Typical Application
Single +5V Supply operation
Vin
50
+5V
0.1µF
+
1/2
CLC427
-
6.8µF +
150
Vo
250
250
NOTE: Vin = 0.15V to 2.3V
© 1996 National Semiconductor Corporation
Printed in the U.S.A.
1 10 100
Frequency (MHz)
Single Supply Response
VCC 5
4
3
2
1
VEE 0
Time (100ns/div)
Pinout
DIP & SOIC
Vo1
Vinv1
Vnon-inv1
VEE
VCC
Vo2
Vinv2
Vnon-inv2
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CLC427AJ pdf
Load Termination
Since the CLC427 design has been optimized for Single
Supply Operation, it is more capable of sourcing rather
than sinking current. For optimum performance, the load
should be tied to VEE. When the load is tied to VEE, the
output always sources current.
Output Overdrive Recovery
When the output range of an amplifier is exceeded, time
is required for the amplifier to recover from this over
driven condition. Figure 5 illustrates the overload
recovery of the CLC427 when the output is overdriven.
An input was applied in an attempt to drive the
output to twice the supply rails, VCC - VEE = 10V, but
the output limits. An inverting gain topology was used,
see Figure 2. As indicated, the CLC427 recovers within
25ns on the rising edge and within 10ns on the falling
edge.
Input
-40
-50
-60
-70
-80
-90
-100
1
10
Frequency (MHz)
100
Figure 7: Input Referred Crosstalk vs. Frequency
Channel A
Channel B
Output
Time (50ns/div)
Figure 5: Overdrive Recovery
Channel Matching
Channel matching and crosstalk rejection are largely
dependent on board layout. The layout of Comlinear’s
dual amplifier evaluation boards are designed to produce
optimum channel matching and isolation. Channel
matching for the CLC427 is shown in Figure 6.
Vout = 0.25Vpp
Channel A
Channel B
1 10
Frequency (MHz)
Figure 6: Channel Matching
The CLC427’s channel-to-channel isolation is better than
-70dB for video frequencies of 4MHz. Input referred
crosstalk vs frequency is illustrated in Figure 7. Pulsed
crosstalk is shown in Figure 8.
Time (50ns/div)
Figure 8: Pulsed crosstalk
Driving Cables and Capacitive Loads
When driving cables, double termination is used to
prevent reflections. For capacitive load applications, a
small series resistor at the output of the CLC427 will
improve stability. The Frequency Response vs.
Capacitive Load plot, in the typical performance
section, gives the recommended series resistance value
for optimum flatness at various capacitive loads.
Power Dissipation
The power dissipation of an amplifier can be described in
two conditions:
• Quiescent Power Dissipation -
PQ (No Load Condition)
• Total Power Dissipation -
PT (with Load Condition)
The following steps can be taken to determine the power
consumption for each CLC427 amplifier:
1. Determine the quiescent power
PQ = ICC (VCC – VEE)
2. Determine the RMS power at the output stage
PO = (VCC – Vload) (Iload)
3. Determine the total RMS power
PT = PQ + PO
Add the total RMS powers for both channels to determine
the power dissipated by the dual.
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