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PDF KH231 Data sheet ( Hoja de datos )
| Número de pieza | KH231 | |
| Descripción | Wideband Buffer/Amplifier | |
| Fabricantes | Cadeka | |
| Logotipo |  |
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www.cadeka.com
KH231
Fast Settling, Wideband Buffer/Amplifier (Av = ±1 to ±5)
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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
Case
ground
Non-Inverting
Input
Inverting
Input
V+ 6
V- 5
ICC Adjust
GND Adjust -VCC
7 89
+4
-4
Supply
Voltage
-VCC
10
Collector
Supply
11 Vo
Output
Not NC 4
Connected
Case
ground
12
+VCC
3 21
GND Adjust +VCC
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
KH231AM
-25°C to +85°C
-55°C to +125°C
-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
1 page  
KH231
Offset Voltage Adjustment
If trimming of the input offset voltage (Vos = Vni -Vin) is
desired, a resistor value of 10kΩ to 1MΩ placed between
pins 8 and 9 will cause Vos to become more negative by
8mV to 0.2mV respectively. Similarly, a resistor placed
between pins 1 and 2 will cause Vos, to become more
positive.
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Thermal Considerations
At high ambient temperatures or large internal power
dissipations, heat sinking is required to maintain
acceptable junction temperatures. Use the thermal
model on the previous page to determine junction
temperatures. Many styles of heat sinks are available for
TO-8 packages; the Thermalloy 2240 and 2268 are good
examples. Some heat sinks are the radial fin type which
cover the pc board and may interfere with external
components. An excellent solution to this problem is to
use surface mounted resistors and capacitors. They
have a very low profile and actually improve high
frequency performance. For use of these heat sinks with
conventional components, a 0.1” high spacer can be inserted
under the TO-8 package to allow sufficient clearance.
Tcase
100°C/W
Tj(pnp)
Ppnp
100°C/W
Tj(npn)
Pnpn
17.5°C/W
Tj(circuit)
Pcircuit
θca
+
-
Tambient
P(circuit) = (ICC)((+VCC) – (VCC)) where ICC = 16mA at ±15V
P(xxx) = [(±VCC) – Vout – (Icol) (Rcol + 4)] (Icol) (%Duty)
For positive Vo and VCC, this is the power in the npn
device. For negative Vo and VCC, this is the power in the
pnp device.
Icol = Vo/RL or 4mA, whichever is greater. (Include feed-
back R in RL.)
Rcol is a resistor (33Ω recommended) between the xxx
collector and ±VCC.
The limiting factor for output current and voltage is junction
temperature. Of secondary importance is I(out), which
should not exceed 150mA.
Tj(pnp) = P(pnp) (100 + θca) + (P(cir) + P(npn))(θca) + Ta,
similar for Tj(npn).
Tj(cir) = P(cir)(48 + θca) + (P(pnp) + P(npn))(θca) + Ta.
DATA SHEET
θca = 65°C/W for the KH231 without heat sink in still air.
30°C/W for the KH231 with a Wakefield 215 heat
sink in still air.
10°C/W for the KH231 with a Wakefield 215 heat
sink at 300 ft/min air.
30°C/W for the KH231 with a Thermalloy 2240A
heat sink in still air.
5°C/W for the KH231 with a Thermalloy 2240A
heat sink at 500 ft/min air.
For example, with the KH231 operating at ±15V while
driving a 100Ω load at 15Vpp output (50% duty cycle
pulse waveform, DC = 0), P(npn) = P(pnp) = 190mW (Rcol
= 33) and P(cir) = 0.48W. Then with the Wakefield
215 heat sink and air flow of 300 ft/min the output
transistors’ Tj is 28°C above ambient and worst case Tj in
the rest of the circuit is 32°C above ambient. In still air,
however, the rise in Tj is 45°C and 49°C, respectively.
With no heat sink, the rise in Tj is 75°C and 79°C,
respectively! Under most conditions, HEAT SINKING IS
REQUIRED.
Other methods of heat sinking may be used, but for
best results, make contact with the base of the KH231
package, use a large thermal capacity heat sink and use
forced air convection.
Low VCC Operation: Supply Current Adjustment
The KH231 is designed to operate on supplies as low as
±5V. In order to improve full bandwidth at reduced sup-
ply voltages, the supply current (ICC) must be increased.
The plot of Bandwidth vs. VCC, shows the effect of short-
ing pins 1 and 2 and pins 8 and 9; this will increase both
bandwidth and supply current. Care should be taken to
not exceed the maximum junction temperatures; for this
reason this technique should not be used with supplies
exceeding ±10V. For intermediate values of VCC,
external resistors between pins 1 and 2 and pins 8 and 9
can be used.
REV. 1A January 2004
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet KH231.PDF ] | |
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