參數(shù)資料
型號(hào)： LT1801
廠(chǎng)商： Linear Technology Corporation
英文描述： Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
中文描述： 單/雙/四路60MHz時(shí)，20V/us，低功耗，軌至軌輸入和輸出精密運(yùn)算放大器
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 279K
代理商： LT1801
LT6220/LT6221/LT6222
15
sn622012 622012fs
severely overdriven, an external resistor should be used to
limit the overdriven current.
The LT6220/LT6221/LT6222’s input stages are also pro-
tected against a large differential input voltage of 1.4V or
higher by a pair of back-to-back diodes, D5/D8, to prevent
the emitter-base breakdown of the input transistors. The
current in these diodes should be limited to less than
10mA when they are active. The worse-case differential
input voltage usually occurs when the input is driven while
the output is shorted to ground in a unity-gain configura-
tion. In addition, the amplifier is protected against ESD
strikes up to 3kV on all pins by a pair of protection diodes
on each pin that are connected to the power supplies as
shown in Figure 1.
Capacitive Load
The LT6220/LT6221/LT6222 are optimized for high band-
width, low power and precision applications. They can
drive a capacitive load up to 100pF in a unity-gain configu-
ration and more for higher gain. When driving a larger
APPLICATIU
W
U
U
capacitive load, a resistor of 10
to 50
should be
connected between the output and the capacitive load to
avoid ringing or oscillation. The feedback should still be
taken from the output so that the resistor will isolate the
capacitive load to ensure stability. Graphs on capacitive
loads show the transient response of the amplifier when
driving capacitive load with specified series resistors.
Feedback Components
When feedback resistors are used to set up gain, care must
be taken to ensure that the pole formed by the feedback
resistors and the total capacitance at the inverting input
does not degrade stability. For instance, the LT6220/
LT6221/LT6222, set up with a noninverting gain of 2, two
5k resistors and a capacitance of 5pF (part plus PC board),
will probably oscillate. The pole is formed at 12.7MHz that
will reduce phase margin by 52 degrees when the cross-
over frequency of the amplifier is around 10MHz. A capaci-
tor of 10pF or higher connecting across the feedback
resistor will eliminate any ringing or oscillation.
TYPICAL APPLICATIO S
Stepped-Gain Photodiode Amplifier
The circuit of Figure 2 is a stepped gain transimpedance
photodiode amplifier. At low signal levels, the circuit has
a high 100k
gain, but at high signal levels the circuit
automatically and smoothly changes to a low 3.2k
gain.
The benefit of a stepped gain approach is that it maximizes
dynamic range, which is very useful on limited supplies.
Put another way, in order to get 100k
sensitivity and still
handle a 1mA signal level without resorting to gain reduc-
tion, the circuit would need a 100V negative voltage
supply.
The operation of the circuit is quite simple. At low photo-
diode currents (below 10
μ
A) the output and inverting
input of the op amp will be no more than 1V below ground.
The LT1634 in parallel with R3 and Q2 keep a constant
current though Q2 of about 20
μ
A. R4 maintains quiescent
current through the LT1634 and pulls Q2’s emitter above
ground, so Q1 is reverse biased and no current flows
through R2. So for small signals, the only feedback path
is R1 (and C1) and the circuit is a simple transimpedance
amplifier with 100k
gain.
Figure 2. Stepped-Gain Photodiode Amplifier
–
+
I
PD
PHOTODIODE
~4pF
V
S
+
V
S
+
V
S
+
V
S
–
V
S
–
LT6220
R1
100k
R2
3.24k
R3
33k
R4
10k
C1
1pF
C2
30pF
Q1
Q2
1
2
3
4
PHILIPS
BCV62
LT1634-1.25
V
OUT
V
S
=
±
1.5V TO
±
5V
622012 F02
相關(guān)PDF資料
PDF描述
LT1802 Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
LT1803 Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
LT1804 Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
LT1805 Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
LT1807 Single/Dual/Quad 60MHz, 20V/us, Low Power, Rail-to-Rail Input and Output Precision Op Amps
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