www.fairchildsemi.com
KH205
Overdrive-Protected Wideband Op Amp
Features
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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 鈥?570mW at 鹵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 鹵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
Supply
Voltage
-V
CC
10
-3dB bandwidth of 170MHz
0.1% settling in 22ns
Complete overdrive protection
Low power: 570mW (190mW at 鹵5V)
3M鈩?input resistance
Output may be current limited
Direct replacement for CLC205
Applications
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Fast, precision A/D conversion
Automatic test equipment
Input/output amplifiers
Photodiode, CCD preamps
IF processors
High-speed modems, radios
Line drivers
Large Signal Pulse Response
A
v
= +20
Output Voltage (2V/div)
A
v
= -20
Time (5ns/div)
Bottom View
Internal
Feedback
Case
ground
GND
7
R
f
8
-V
CC
9
Collector
Supply
Output
-25擄C to +85擄C
-55擄C to +125擄C
-55擄C to +125擄C
KH205AM
2000鈩?/div>
Non-Inverting
Input
Inverting
Input
Not
Connected
V+ 6
+
V- 5
NC 4
3
2
NC
6
6
-
11 V
o
12
+V
CC
KH205HXC
KH205HXA
-55擄C to +125擄C
-55擄C to +125擄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
Collector
Supply
1
+V
CC
Supply
Voltage
Typical Performance
Gain Setting
Parameter
+7 +20 +50
-1
-20 -50
Units
MHz
ns
V/ns
ns
-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
Case and
bias ground
GND
Not Connected
Pin 8 provides access to a 2000鈩?feed-
back resistor which can be connected to
the output or left open if an external feed-
back resistor is desired.
REV. 1A February 2001
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