KH231 Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – Fast Settling, Wideband Buffer/Amplifier (Av = ±1 to ±5)

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KH231
Fast Settling, Wideband Buffer/Amplifier (Av = ±1 to ±5)
Features
s 165MHz closed-loop – -3dB bandwidth
s 15ns settling to 0.05%
s 1mV input offset voltage, 10µV/°C drift
s 100mA output current
s Excellent AC and DC linearity
s Direct replacement for CLC231
Applications
s Driving flash A/D converters
s Precision line driving
(a gain of 2 cancels matched-line losses)
s DAC current-to-voltage conversion
s Low-power, high-speed applications (50mW @ ±5V)
Small Signal Pulse Response
Av = 2
Av = -2
Time (5ns/div)
Bottom View _K
ICC Adjust
Case
ground
GND ^{Adjust -V}CC
Supply
Voltage
Non-Inverting
Input
7
V+ 6
8
9
-V_CC
10
Collector
Supply
+
Inverting
V- 5
Input
-
4
11 V_o
4
Output
Not NC 4
Connected
Case
ground
12
+V_CC
3
2
1
GND Adjust +V_CC
ICC Adjust
Supply
Voltage
Collector
Supply
Pins 2 and 8 are used to adjust the supply current or to adjust the off-
set voltage (see text). These pins are normally left unconnected.
Typical Performance
Gain Setting
Parameter
1 2 5 -1 -2 -5
-3dB bandwidth
180 165 130 165 150 115
rise time (2V)
1.8 2.0 2.5 2.0 2.2 2.9
slew rate
2.5 3.0 3.0 3.0 3.0 3.0
settling time (to 0.1%) 12 12 12 12 12 15
Units
MHz
ns
V/ns
ns
General Description
The KH231 Buffer/Amplifier is a wideband operational
amplifier designed specifically for high-speed, low-
gain applications. The KH231 is based on a current
feedback op amp topology-a unique design that both
eliminates the gain-bandwidth tradeoff and permits
unprecedented high-speed performance. (See table below.)
The KH231 Buffer/Amplifier is the ideal design alter-
native to low precision open-loop buffers and oscillation-
prone conventional op amps. The KH231 offers precise
gains from ±1.000 to ±-5.000 and linearity that is a
true 0.1%-even for demanding 50Ω loads. Open-loop
buffers, on the other hand, offer a nominal gain of
0.95 ±0.03 and a linearity of only 3% for typical loads.
A buffer’s settling time may look impressive but it is
usually specified at unrealistically large load resis-
tances or when the effects of thermal tail are not
included; the KH231 Buffer/Amplifier settles to 0.05%
in 15ns-while driving a 100Ω load.
Offsets and drifts, usually a low priority in conven-
tional high-speed op amp designs, were not ignored
in the KH231; the input offset voltage is typically 1mV
and input offset voltage drift is only 10µV/°C. The
KH231 is stable and oscillation-free across the entire
gain range and since it’s internally compensated, the
user is saved the trouble of designing external com-
pensation networks and having to “tweak” them in
production. The absence of a gain-bandwidth trade-
off in the KH231 allows performance to be predicted
easily; the table below shows how the bandwidth is
affected very little by changing the gain setting.
The KH231 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
The KH231 is constructed using thin film resistor/bipolar
transistor technology, and available in these versions:
KH231AI
KH231AK
-25°C to +85°C
-55°C to +125°C
KH231AM -55°C to +125°C
KH231HXC -55°C to +125°C
KH231HXA -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#: 5962-8959401HXC
SMD#: 5962-8959401HXA
REV. 1A January 2004