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PDF KH300 Data sheet ( Hoja de datos )
| Número de pieza | KH300 | |
| Descripción | High-Speed Operational Amplifier | |
| Fabricantes | Cadeka | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de KH300 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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KH300
Wideband, High-Speed Operational Amplifier
www.datasheet4u.com
www.cadeka.com
Features
I -3dB bandwidth of 85MHz
I 3000V/µsec slew rate
I 4ns rise and fall time
I 100mA output current
I Low distortion, linear phase
Applications
I Digital communications
I Baseband and video communications
I Instrument input/output amplifiers
I Fast A to D, D to A conversion
I Graphic CRT video drive amp
I Coaxial cable line driver
V+ 6
+
V- 8
-
16 +VCC
12 Vo
1500
11 Rf
13 24
-VCC GND
KH300 Equivalent Circuit Diagram
Pin 11 provides access to a 1500Ω feedback
resistor which can be connected to the out-
put or left open if an external feedback
resistor is desired. All undesignated pins are
internally unconnected.
General Description
The KH300 operational amplifier is a current feed-
back amplifier that provides a DC-85MHz -3dB band-
width that is virtually independent of gain setting.
Rise and fall times of 4ns and drive capability of
22Vpp and 100mA add to the KH300’s impressive
specifications.
Using the KH300 is as easy as adding power supplies
and a gain-setting resistor. Unlike conventional op
amp designs in which optimum gain-bandwidth
product occurs at a high gain, minimum settling time
at a gain of -1, maximum slew rate at a gain of +1,
et cetera, the KH300 offers consistent performance
at gain settings from 1 to 40 inverting or non-inverting.
As a result, designing with the KH300 is greatly
simplified. And since no external compensation is
necessary, “tweeks” on the production line have been
eliminated, making the KH300 an efficient
component for use in production situations.
Flat gain and phase response from DC to 45MHz and
superior rise and fall times make the KH300 an ideal
amplifier for a broad range of pulse, analog, and
digital applications. A 45MHz full power bandwidth
(20Vpp into 100Ω) and 3000V/µsec slew rate eliminate
the need for power buffers in many applications
such as driving “flash” A to D converters or line-
driving. For applications requiring lower power
consumption, the KH300 can operate on supplies as
low as ±5V. Fast overload recovery (20ns) helps
prevent loss of data in communications applications
and flat phase response reduces distortion, even when
data must be sent over extended lengths of line.
The KH300A is packaged in a side-brazed 24-pin
ceramic DIP and is specified at 25°C.
REV. 1A January 2004
1 page  
KH300
Layout Considerations
To assure optimum performance the user should follow
good layout practices which minimize the unwanted
coupling of signals between nodes. During initial bread-
boarding of the circuit, use direct point to point wiring,
keeping lead lengths to less than 0.25”. The use of
solid, unbroken ground plane is helpful. Avoid wire-wrap
www.dattyapsheeeptc4ub.cooamrds and methods. Sockets with small, short
pin receptacles may be used with minimal performance
degradation although their use is not recommended.
+15
0.01µF
Vin
Ri
50Ω
22µF
16
6+
11
KH300
Rg 8 -
24
13
-15
12
22µF
0.01µF
Ro
50Ω
1/2 Vo
RL
50Ω
Av = 1 + Rf
Rg
Rf = 1500Ω (internal)
Figure 1: Recommended Non-inverting Gain Circuit
+15
0.01µF
Vin
Ri
50Ω
22µF
16
51 6 +
11
KH300
Rg 8 -
24
13
-15
12
22µF
0.01µF
Ro
50Ω
1/2 Vo
RL
50Ω
For Zin = 50Ω Select:
Rg||Ri = 50
-Av = Rf
Rg
Rf = 1500Ω (internal)
Figure 2: Recommended Inverting Gain Circuit
During pc board layout keep all traces short and direct.
Rf and Rg should be as close as possible to pin 8 to
minimize capacitance at that point. For the same reason,
remove ground plane from the vicinity of pins 8 and 6.
In other areas, use as much ground plane as possible
on one side of the pc board. It is especially important to
provide a ground return path for current from the load
resistor to the power supply bypass capacitors. Ceramic
capacitors of 0.01 to 0.1µF should be close to pins 13
DATA SHEET
and 16. Larger tantalum capacitors should also be
placed within one inch of these pins. To prevent signal
distortion caused by reflections from impedance mis-
matches, use terminated microstrip or coaxial cable
when the signal must traverse more than a few inches.
Since the pc board forms such an important part of the
circuit, much time can be saved if prototype boards of
any high frequency sections are built and tested early in
the design phase.
Controlling Bandwidth and Passband Response
As with any op amp, the ratio of the two feedback resistors
Rf and Rg, determines the gain of the KH300. Unlike
conventional op amps, however, the closed loop pole-
zero response of the KH300 is affected very little by the
value of Rg. Rg scales the magnitude of the gain, but
does not change the value of the feedback. Rf does
influence the feedback and so the KH300 has been
internally compensated for optimum performance with
Rf = 1500Ω, but any value of Rf > 500Ω may be used
with a single capacitor placed between pins 8 and 12
for compensation. See table 1. As Rf decreases, Cc
must increase to maintain flat gain. Large values of Rf
and Cc can be used together or separately to reduce
the bandwidth. This may be desirable for reducing the
noise bandwidth in applications not requiring the full fre-
quency response available.
Table 1: Bandwidth vs. Rf and Cc (Av = +20)
Rf
(KΩ)
10.0
5.0
2.0
1.5
1.0
0.75
0.50
Cc
(pF)
0
0
0
0
0.3
1.1
1.9
f±0.3dB
(MHz)
2
3
8
45
90
95
110
f-3.0dB
(MHz)
5
12
40
85
115
130
135
Low Gain Operation
The small amount of stray capacitance present at the
inverting input can cause peaking which increases with
decreasing gain. The gain setting resistor Rg is effectively
in parallel with this capacitance and so a frequency
domain pole results. With small Rg (Gain > 8), this pole
is at a high frequency and it affects the closed loop gain
of the KH300 only slightly. At lower values of gain, this
pole becomes significant. For example, at a gain of +2,
the gain may peak as much as 3dB at 75MHz, and
have a bandwidth exceeding 150MHz. The same
behavior does not exist for low inverting gains, however,
since the inverting input is a virtual ground which main-
tains a constant voltage across the stray capacitance.
Even at inverting gains << 1, the frequency response
remains unchanged.
REV. 1A January 2004
5
5 Page | ||
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| PDF Descargar | [ Datasheet KH300.PDF ] | |
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