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PDF CLC436 Data sheet ( Hoja de datos )
| Número de pieza | CLC436 | |
| Descripción | 200MHz/ 15V/ Low-Power Voltage Feedback Op Amp | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1996
Comlinear CLC436
200MHz, ±15V, Low-Power Voltage Feedback Op Amp
General Description
The Comlinear CLC436 is a high-performance, low power,
voltage-feedback operational amplifier that has been designed
for a wide range of low-cost applications. The CLC436 is
specified to operate from dual ±5V to dual ±15V power supplies.
Operating from ±5V supplies, the unity gain stable CLC436
consumes a mere 23mW of power and features a 150MHz
bandwidth and 850V/µs slew rate. Operating from ±15V power
supplies, the CLC436 consumes only 69mW (Icc = 2.3mA) to
provide a 200MHz unity-gain bandwidth, a very fast 2400V/µs
slew rate and 13ns rise/fall times (5V step). At ±15V, the device
also provides large signal swings (>20Vpp) to give high dynamic
range and signal-to-noise ratio.
As a low-power NTSC or PAL video line-driver, the CLC436
delivers low differential gain and phase errors (0.2%, 1.2°) and
very high output drive current of 80mA. When used as a video
ADC driver, the CLC436 offers low Total Harmonic Distortion
(THD) and high Spurious Free Dynamic Range (SFDR).
Because of it’s voltage feedback topology, the CLC436
allows use of reactive elements in the feedback path and can
be configured as an excellent active filter for video-
reconstruction DACs.
The CLC436’s combination of low cost and high performance in
addition to its low-power voltage-feedback topology make it a
versatile signal conditioning building block for a wide range
of price-sensitive applications.
Features
s 2.3mA supply current
s 200MHz unity-gain bandwidth
s 2400V/µs slew rate
s Unity gain stable
s 110dB common-mode rejection ratio
s 80mA drive current
s >20Vpp output swing
s ±5V to ±15V supplies
Applications
s Video line driver
s Video ADC driver
s Desktop Multimedia
s Low powered cable driver
s Video DAC buffer
s Active filters/integrators
s NTSC & PAL video systems
Frequency Response (Av = +2V/V)
Vout = 0.5Vpp
Vcc = ±15V
RL = 1kΩ
Typical Application
State-Variable Filter (1MHz, Q = 5, G = 2)
R1
6631Ω
C
120pF
Vin R4
3315Ω
-
CLC436
+
R3
1326Ω
C
120pF
R2
1326Ω
-
CLC436
+
R
500Ω
Bandpass
Output
Low-pass
Output
R
500Ω
-
CLC436
+
Bandpass Output
10
5
0
-5
-10
-15
-20
0.1
1
Frequency (MHz)
10
Pinout
DIP & SOIC
© 1996 National Semiconductor Corporation
Printed in the U.S.A.
http://www.national.com
1 page  
Vcc
R1
Vin
C1
R2
Vcc
+
CLC436
-
Rf
Rg
C2
Vo
Figure 3: Single Supply Circuit
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 of the CLC436:
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
The maximum power that the package can dissipate at
a given temperature is illustrated in the Power Derating
plot in the Typical Performance Characteristics
section. The power derating curve for any package
can be derived by utilizing the following equation:
P = (175° − Tamb )
θJA
where: Tamb = Ambient temperature in °C
θJA = Thermal resistance, from junction to
ambient, for a given package in °C/W
Layout Considerations
A proper printed circuit layout is essential for achieving
high frequency performance. Comlinear provides eval-
uation boards for the CLC436 (730013 - DIP, 730027-
SOIC) and suggests their use as a guide for high
frequency layout and as an aid for device testing and
characterization.
Supply bypassing is required for optimum performance.
The bypass capacitors provide a low impedance
current return path at the supply pins. They also provide
high frequency filtering on the power supply traces.
Other layout factors also play a major role in high
frequency performance. The following steps are
recommended as a basis for high frequency layout:
1. Include 6.8µF tantalum and 0.01µF ceramic
bypass capacitors on both supplies.
2. Place the 6.8µF capacitors within 0.75 inches
of the power pins.
3. Place the 0.01µF capacitors within 0.1 inches
of the power pins.
4. Remove the ground plane near the input and
output pins to reduce parasitic capacitance.
5. Minimize all trace lengths to reduce series
inductances.
Applications Circuit
State Variable Filter
The filter shown on the front page offers both a band-
pass and a low pass output. The design equations are
shown below.
Q = R1
R3
Av
=
R1
R4
, desired
mid−band
gain
fr=
Q , desired
2πR1C
resonant
frequency
R2 = R3
The state variable filter can be modified to obtain a
tunable band pass filter. This technique is shown in
the CLC522, Wideband Variable Gain Amplifier,
data sheet.
Transimpedance Application
The low 1.1pA/√Hz input current noise and unity gain
stability make the CLC436 useful as a photo diode pre-
amplifier. Figure 4 illustrates a transimpedance amplifier.
Rf sets the transimpedance gain. The photodiode current
is multiplied by Rf to determine the output voltage.
Cf
Photo Diode
Representation
Iin Cd
Rf
-
CLC436
+
Vo
Vo = Iin*Rf
Figure 4: Transimpedance A4m36pFliifie5r
The feedback capacitor (Cf) is required to compensate
for the added input capacitance of the photodiode (Cd).
The feedback capacitance reduces peaking in the fre-
quency response. As the value of the feedback capac-
itance increases from zero, the rolloff of the response
will increase.
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| PDF Descargar | [ Datasheet CLC436.PDF ] | |
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