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부품번호 | KH207 기능 |
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기능 | Low Distortion Wideband Op Amp | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 7 페이지수
KH207
Low Distortion Wideband Op Amp
www.fairchildsemi.com
Features
s -80/-85dBc 2nd/3rd HD at 20MHz
s -3dB bandwidth of 170MHz
s 0.1% settling in 22ns
s Complete overdrive protection
s 2400V/µs slew rate
s 3MΩ input resistance
s Output may be current limited
s Direct replacement for CLC207
Applications
s Fast, precision A/D conversion
s Automatic test equipment
s Input/output amplifiers
s Photodiode, CCD preamps
s High-speed modems, radios
s Line drivers
Bottom View
Internal
Feedback
Case
ground
GND Rf
78
Non-Inverting
Input
V+ 6
2000Ω
Inverting
Input
V- 5
+
-
-VCC
9
Supply
Voltage
-VCC
10
Collector
Supply
6
6 11 Vo
Output
Not
Connected
NC 4
3
12
+VCC
21
Case and
bias ground
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 KH207 is a wideband, low distortion operational
amplifier designed specifically for applications requiring
both high speed and wide dynamic range. Utilizing
a proprietary current feedback architecture, the
KH207 offers performance far superior to that of
conventional voltage feedback op amps.
The most attractive feature of the KH207 is its
extremely low distortion: -80/-85dBc 2nd/3rd harmonics
at 20MHz (2Vpp, RL = 200Ω). The KH207 also provides
-3dB bandwidth of 170MHz at a gain of +20, settles to
0.1% in 22ns and slews at a rate of 2400V/µs. The
combination of these features positions the KH207 as
the right choice for high speed applications requiring
exceptional signal purity.
High speed, high resolution A/D and D/A converter
systems requiring low distortion operation will find
the KH207 an excellent choice. Wide dynamic range
systems such as radar and communication receivers
will find that the KH207’s low harmonic distortion and
low noise make it an attractive high speed solution.
The addition of the KH207 to the KH205/206 Series
of high speed operational amplifiers broadens the
selection of features available from which to choose.
The KH205 offers low power operation, the KH206
offers higher drive operation, and the KH207 offers
operation with extremely low distortion, all of which
are pin compatible and overdrive protected.
The KH207 is constructed using thin film resistor/bipolar
transistor technology, and is available in the following
versions:
KH207AI
KH207AK
-25°C to +85°C
-55°C to +125°C
KH207AM -55°C to +125°C
KH207HXC -55°C to +125°C
KH207HXA -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#: 5962-9097701HXC
SMD#: 5962-9097701HXA
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 February 2001
DATA SHEET
Current Feedback Amplifiers
Some of the key features of current feedback technology
are:
s Independence of AC bandwidth and voltage gain
s Adjustable frequency response with feedback resistor
s High slew rate
s Fast settling
Current feedback operation can be described using a simple
equation. The voltage gain for a non-inverting or inverting
current feedback amplifier is approximated by Equation 1.
where:
Vo
Vin
=
Av
1+
Rf
Z(jω)
Equation 1
s Av is the closed loop DC voltage gain
s Rf is the feedback resistor
s Z(jω) is the CLC205’s open loop transimpedance
gain
s Z(jω) is the loop gain
Rf
The denominator of Equation 1 is approximately equal to
1 at low frequencies. Near the -3dB corner frequency, the
interaction between Rf and Z(jω) dominates the circuit
performance. The value of the feedback resistor has a
large affect on the circuits performance. Increasing Rf
has the following affects:
s Decreases loop gain
s Decreases bandwidth
s Reduces gain peaking
s Lowers pulse response overshoot
s Affects frequency response phase linearity
Overdrive Protection
Unlike most other high-speed op amps, the KH207 is not
damaged by saturation caused by overdriving input
signals (where Vin x gain > max. Vo). The KH207 self
limits the current at the inverting input when the output is
saturated (see the inverting input current self limit
specification); this ensures that the amplifier will not be
damaged due to excessive internal currents during overdrive.
For protection against input signals which would exceed
either the maximum differential or common mode input
voltage, the diode clamp circuits below may be used.
differential protection
Vin
+Vcc
+
KH207
-Vcc -
Rg
Vo
common mode
protection
Figure 1: Diode Clamp Circuits for Common Mode
and Differential Mode Protection
4
KH207
Short Circuit Protection
Damage caused by short circuits at the output may be
prevented by limiting the output current to safe levels.
The most simple current limit circuit calls for placing
resistors between the output stage collector supplies and
the output stage collectors (pins 12 and 10). The value of
this resistor is determined by:
RC
=
VC
II
− RI
where II is the desired limit current and RI is the minimum
expected load resistance (0Ω for a short to ground).
Bypass capacitors of 0.01µF on should be used on the
collectors as in Figures 2 and 3.
+15V
3.9
33Ω
Capactance in µF
.1 .01
Vin
Ri
50Ω
6
1
+
12 8
KH207
5-
10
3,7
Rg 9
11
Vo
200Ω
-15V
33Ω
3.9 .1
Av
= 1+ Rf
Rg
.01 Rf = 2000Ω (internal)
Figure 2: Recommended Non-Inverting Gain Circuit
+15V
3.9
33Ω
Capactance in µF
.1 .01
Vin
-15V
50Ω
6
1
+
12 8
Rg
Ri
KH207
5-
10
3,7
9
11
Vo
200Ω
33Ω
3.9 .1
Av
=
-Rf
Rg
.01 Rf = 2000Ω (internal)
For Zin = 50Ω, select Rg||Ri = 50Ω
Figure 3: Recommended Inverting Gain Circuit
A more sophisticated current limit circuit which provides
a limit current independent of RI is shown in Figure 4 on
page 5.
With the component values indicated, current limiting
occurs at 50mA. For other values of current limit (II),
select RC to equal Vbe/lI. Where Vbe is the base to
emitter voltage drop of Q3 (or Q4) at a current of [2VCC –
1.4] / Rx, where Rx ≤ [(2VCC – 1.4) / II] Bmin.
Also, Bmin is the minimum beta of Q1 (or Q2) at a current
of II. Since the limit current depends on Vbe, which is
temperature dependent, the limit current is likewise
temperature dependent.
REV. 1A February 2001
4페이지 DATA SHEET
KH207 Package Dimensions
A
φD D1
F
L
φb
e1
789
e2
6 10
e 5 11
4 12
321
kα
k1
SYMBOL
A
φb
φD
φD1
e
e1
e2
F
k
k1
L
α
TO-8
INCHES
MILIMETERS
Minimun Maximum Minimum Maximum
0.142
0.181
3.61
4.60
0.016
0.019
0.41
0.48
0.595
0.605
15.11
15.37
0.543
0.555
13.79
14.10
0.400 BSC
10.16 BSC
0.200 BSC
5.08 BSC
0.100 BSC
2.54 BSC
0.016
0.030
0.41
0.76
0.026
0.036
0.66
0.91
0.026
0.036
0.66
0.91
0.310
0.340
7.87
8.64
45° BSC
45° BSC
NOTES:
Seal: cap weld
Lead finish: gold per MIL-M-38510
Package composition:
Package: metal
Lid: Type A per MIL-M-38510
KH207
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICES TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD
DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT
OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for
surgical implant into the body, or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a significant injury of the user.
2. A critical component in any component of a life support device or system whose
failure to perform can be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
© 2001 Fairchild Semiconductor Corporation
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |