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PDF KH205 Data sheet ( Hoja de datos )
| Número de pieza | KH205 | |
| Descripción | Overdrive-Protected Wideband Op Amp | |
| Fabricantes | Cadeka | |
| Logotipo |  |
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www.cadeka.com
KH205
Overdrive-Protected Wideband Op Amp
www.datasheet4u.com
Features
s -3dB bandwidth of 170MHz
s 0.1% settling in 22ns
s Complete overdrive protection
s Low power: 570mW (190mW at ±5V)
s 3MΩ input resistance
s Output may be current limited
s Direct replacement for CLC205
Applications
s Fast, precision A/D conversion
s Automatic test equipment
s Input/output amplifiers
s Photodiode, CCD preamps
s IF processors
s High-speed modems, radios
s Line drivers
Large Signal Pulse Response
Av = +20
Av = -20
Time (5ns/div)
Bottom View
2
Internal
Feedback
Case
ground
GND Rf
Non-Inverting
Input
V+ 6
78
2000Ω
Inverting
Input
V- 5
+
-
-VCC
9
Supply
Voltage
-VCC
10
Collector
Supply
6
6 11 Vo
Output
Not NC 4
Connected
Case and
bias ground
12
+VCC
3 21
GND NC +VCC
Not Connected
Supply
Voltage
Collector
Supply
Pin 8 provides access to a 2000Ω feed-
back resistor which can be connected to
the output or left open if an external feed-
back resistor is desired.
General Description
The KH205 is a wideband overdrive-protected opera-
tional amplifier designed for applications needing
both speed and low power operation. Utilizing a
well-established current feedback architecture, the
KH205 exhibits performance far beyond that of
conventional voltage feedback op amps. For example,
the KH205 has a bandwidth of 170MHz at a gain of
+20 and settles to 0.1% in 22ns. Plus, the KH205 has
a combination of important features not found in
other high-speed op amps.
For example, the KH205 has been designed to consume
little power – 570mW at ±15V supplies. The result is
lower power supply requirements and less system-
level heat dissipation. In addition, the device can be
operated on supply voltages as low as ±5V for even
lower power dissipation.
Complete overdrive protection has been designed
into the part. This is critical for applications, such as
ATE and instrumentation, which require protection
from signal levels high enough to cause saturation of
the amplifier. This feature allows the output of the
op amp to be protected against short circuits using
techniques developed for low-speed op amps. With
this capability, even the fastest signal sources can
feature effective short circuit protection.
The KH205 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
KH205AI
KH205AK
-25°C to +85°C
-55°C to +125°C
KH205AM -55°C to +125°C
KH205HXC -55°C to +125°C
KH205HXA -55°C to +125°C
12-pin TO-8 can
12-pin TO-8 can, features
burn-in & hermetic testing
12-pin TO-8 can,
environmentally
screened and electrically
tested to MIL-STD-883
SMD#: 5962-9083501HXC
SMD#: 5962-9083501HXA
Typical Performance
Gain Setting
Parameter
+7 +20 +50 -1 -20 -50
-3dB bandwidth
220 170 80 220 130 80
rise time
1.7 2.2 4.7 1.7 2.9 4.7
slew rate
2.4 2.4 2.4 2.4 2.4 2.4
settling time (to 0.1%) 22 22 20 21 20 19
Units
MHz
ns
V/ns
ns
REV. 1A January 2004
1 page  
KH205
DATA SHEET
+Vcc
Rc
12Ω
Q1
(MJE170)
Q3
(2N3906)
www.datasheet4u.com
to pin 12
to pin 10
0.01ΩF
Rx
14.3kΩ
0.01ΩF
Q2
(MJE180)
Rc
12Ω
Q4
(2N3904)
-Vcc
Figure 4: Active Current Limit Circuit (50mA)
Controlling Bandwidth and Passband Response
In most applications, a feedback resistoKr value of 2kΩ
will provide optimum performance; nonetheless, some
applications may require a resistor of some other value.
The response versus Rf plot on the previous page shows
how decreasing Rf will increase bandwidth (and frequency
response peaking, which may lead to instability).
Conversely, large values of feedback resistance tend to
roll off the response.
The best settling time performance requires the use of an
external feedback resistor (use of the internal resistor
results in a 0.1% to 0.2% settling tail). The settling
performance may be improved slightly by adding a
capacitance of 0.4pF in parallel with the feedback
resistor (settling time specifications reflect performance
with an external feedback resistor but with no external
capacitance).
Noise Analysis
Approximate noise figure can be determined for the
KH205 using the Equivalent Input Noise plot on page 3
and the equations shown below.
kT = 4.00 x 10-21 Joules at 290°K
Vn is spot noise voltage (V/√Hz)
in is non-inverting spot noise current (A/√Hz)
ii is inverting spot noise current (A/√Hz)
Rs
+
Rn
KH205
-
Rf
Rg
Ro
REV. 1A January 2004
F
=
10 log
1+
R
R
s
n
+
Rs
4 kT
⋅
i
2
n
+ Vn2
R
2
p
+
R
2
f
i
2
i
R
2
p
A
2
v
where R p
=
Rs Rn
Rs +Rn
;
Av
= Rf
Rg
+1
Figure 5: Noise Figure Diagram and Equations
(Noise Figure is for the Network Inside this Box.)
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 KH205 will
improve stability and settling performance.
Transmission Line Matching
One method for matching the characteristic impedance
(Zo) of a transmission line or cable is to place the
appropriate resistor at the input or output of the amplifier.
Figure 6 shows typical inverting and non-inverting circuit
configurations for matching transmission lines.
R1 Z0
R3
C6
V1 +-
+
R2
KH205
-
R6
Z0
Vo
R7
R4 Z0
Rg Rf
V2 +-
R5
Figure 6: Transmission Line Matching
Non-inverting gain applications:
s Connect Rg directly to ground.
s Make R1, R2, R6, and R7 equal to Zo.
s Use R3 to isolate the amplifier from reactive
loading caused by the transmission line,
or by parasitics.
Inverting gain applications:
s Connect R3 directly to ground.
s Make the resistors R4, R6, and R7 equal to Zo.
s Make R5 II Rg = Zo.
The input and output matching resistors attenuate the
signal by a factor of 2, therefore additional gain is needed.
Use C6 to match the output transmission line over a
greater frequency range. C6 compensates for the increase
of the amplifier’s output impedance with frequency.
Dynamic Range (Intermods)
For RF applications, the KH205 specifies a third
order intercept of 30dBm at 60MHz and Po = 10dBm.
A 2-Tone, 3rd Order IMD Intercept plot is found in
the Typical Performance Characteristics section.
The output power level is taken at the load. Third-order
harmonic distortion is calculated with the
formula:
HD3rd = 2 • (IP3o – Po)
5
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| PDF Descargar | [ Datasheet KH205.PDF ] | |
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