LT1223(RevA) 查看數據表（PDF） - Linear Technology
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LT1223 Datasheet PDF : 12 Pages
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LT1223
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Gain and Phase vs
Frequency
20
225
15
VS = ±15V
RF = RG = 1k
180
10
GAIN
135
5
90
RL= 100Ω RL ≥ 1k
0
45
PHASE
–5
0
RL ≥ 1k
–10
RL = 100Ω
–45
–15
–90
–20
–135
–25
–30
1M
10M
100M
–180
–225
1G
FREQUENCY (Hz)
LT1223 • TPC20
Total Harmonic Distortion vs
Frequency
0.1
VS = ±15V
VO = 7VRMS
RL = 400Ω
RF = RG =1k
0.01
THD
0.001
10
100
1k
10k
100k
FREQUENCY (Hz)
LT1223 • TPC21
Noninverting Amplifier Settling
Time to 10mV vs Output Step
10
8
AV = +1
RF = 1k
6 VS = ±15V
4 RL = 1k
TO 10mV
2
0
–2
–4
–6
TO 10mV
–8
–10
0
20
40
60
80 100
SETTLING TIME (ns)
LT1223 • TPC23
Noninverting Amplifier Settling
Time to 1mV vs Output Step
10
8
AV = +1
RF = 1k
6
VS = ±15V
RL = 1k
4
TO 1mV
2
0
–2
–4
–6
TO 1mV
–8
–10
0
1
2
SETTLING TIME (µs)
LT1223 • TPC24
2nd and 3rd Harmonic
Distortion vs Frequency
–20
VS = ± 15V
VO = 2VP-P
2ND
–30 RL = 100
RF = 1k
3RD
AV = 10dB
–40
–50
–60
–70
1
10
100
FREQUENCY (MHz)
LT1223 • TPC22
Inverting Amplifier Settling
Time vs Output Step
10
8
AV = –1
RF = 1k
TO 10mV
6 VS = ±15V
4 RL = 1k
TO 1mV
2
0
–2
–4
TO 10mV
–6
TO 1mV
–8
–10
0
20
40
60
80 100
SETTLING TIME (ns)
LT1223 • TPC25
APPLICATI S I FOR ATIO
Current Feedback Basics
The small-signal bandwidth of the LT1223, like all current
feedback amplifiers, isn’t a straight inverse function of the
closed-loop gain. This is because the feedback resistors
determine the amount of current driving the amplifier’s
internal compensation capacitor. In fact, the amplifier’s
feedback resistor (RF) from output to inverting input
works with internal junction capacitances of the LT1223 to
set the closed-loop bandwidth.
Even though the gain set resistor (RG) from inverting input
to ground works with RF to set the voltage gain just like it
does in a voltage feedback op amp, the closed-loop
bandwidth does not change. This is because the equiva-
lent gain bandwidth product of the current feedback am-
plifier is set by the Thevenin equivalent resistance at the
inverting input and the internal compensation capacitor.
By keeping RF constant and changing the gain with RG, the
Thevenin resistance changes by the same amount as the
change in gain. As a result, the net closed-loop bandwidth
of the LT1223 remains the same for various closed-loop
gains.
6
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