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參數(shù)資料
| 型號： | KH300 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Wideband, High-Speed Operational Amplifier |
| 中文描述： | 寬帶，高速運算放大器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 94K |
| 代理商： | KH300 |
DATA SHEET
KH300
6
REV. 1A February 2001
To avoid the peaking at low non-inverting gains, place a
resistor R
p
in series with the input signal path just ahead
of pin 6, the non-inverting input. This forms a low pass
filter with the capacitance at pin 6 which can be made to
cancel the peaking due to the capacitance at pin 8, the
inverting input. At a gain of +2, for example, choosing
R
p
such that the source impedance in parallel with R
i
(see Figure 1), plus R
p
equals 175
will flatten the
frequency response. For larger gains, R
p
will decrease.
Settling Time, Offset, and Drift
After an output transition has occurred, the output
settles very rapidly to final value and no change occurs
for several microseconds. Thereafter, thermal gradients
inside the KH300 will cause the output to begin to drift.
When this can not be tolerated, or when the initial offset
voltage and drift is unacceptable, the use of a compos-
ite amplifier is advised. This technique reduces the off-
set and drift to that of a monolithic, low frequency op
amp, such as an LF356A. The composite amplifier
technique is fully described in the KH103 data sheet.
A simple offset adjustment can be implemented by con-
necting the wiper of a potentiometer, whose end termi-
nals connect to ±15V, through a 20K resistor to pin 8 of
the KH300.
Overload Protection
To avoid damage to the KH300, care must be taken to
insure that the input voltage does not exceed (|V
CC
| -
2.5)/A
V
. High speed, low capacitance diodes should be
used to limit the maximum input voltage to safe levels if
a potential for overload exists.
If in the non-inverting configuration the resistor R
i
, which
sets the input impedance, is large, the bias current at
pin 6, which is typically a few pA but which may be as
large as 18
μ
A, can create a large enough input voltage
to exceed the overload condition. It is therefore recom-
mended that R
i
< [(|V
CC
| -2.5)/ A
V
]/(18
μ
A).
Distortion and Noise
The graphs of intercept point versus frequency on the
preceding page make it easy to predict the distortion at
any frequency, given the output voltage of the KH300.
First, convert the output voltage (V
o
) to V
rms
= (V
pp
/2
√
2)
and then to P = (10log
10
(20V
rms2
)) to get output power in
dBm. At the frequency of interest, its 2nd harmonic will
be S
2
= (I
2
- P) dB below the level of P. Its third harmonic
will be S
3
= 2 (l
3
= P) dB below P as will the two tone
third order intermodulation products. These approxima-
tions are useful for P < -1dB compression levels.
Approximate noise figure can be determined for the
KH300 using the Equivalent Input Noise graph on the
preceding page. The following equation can be used to
determine noise figure (F) in dB:
Where v
n
is the rms noise voltage and in is the rms noise
current. Beyond the breakpoint at the curves (i.e., where
they are flat), broadband noise figure equals spot noise
figure, so
f should equal one (1) and vnand in should
be read directly off of the graph. Below the breakpoint,
the noise must be integrated and
f set to the appropriate
bandwidth.
F
v
i
R
A
kTR
f
n
n
f
v
s
=
+
+
10
1
4
2
2
2
2
log
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| KH-300 | 制造商:WALDOM ELECTRONICS 功能描述: |
| KH300A | 功能描述:運算放大器 - 運放 OP AMP HI-SPEED 3000V/us 85MHz 100mA RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| KH-300-C | 制造商:WALDOM ELECTRONICS 功能描述: 制造商:GC Electronics 功能描述: 制造商:Waldom Electronics 功能描述: |
| KH30-16-10PN | 制造商:ITT Interconnect Solutions 功能描述:KH30-16-10PN - Bulk |
| KH30-16-3PN | 制造商:ITT Interconnect Solutions 功能描述:KH30-16-3PN - Bulk |
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