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参数资料
| 型号： | LT1223MJ8#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, CDIP8 |
| 封装： | 0.300 INCH, HERMETIC SEALED, CERAMIC, DIP-8 |
| 文件页数： | 14/16页 |
| 文件大小： | 247K |
| 代理商： | LT1223MJ8#TR |
LT1223
7
1223fb
APPLICATIO S I FOR ATIO
WU
U
TYPICAL PERFOR A CE CHARACTERISTICS
UW
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.
Voltage Gain and Phase vs
Total Harmonic Distortion vs
2nd and 3rd Harmonic
Frequency
Distortion vs Frequency
Noninverting Amplifier Settling
Inverting Amplifier Settling
Time to 10mV vs Output Step
Time to 1mV vs Output Step
Time vs Output Step
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
FREQUENCY (Hz)
1M
–30
VOLTAGE
GAIN
(dB)
–15
5
20
10M
100M
1G
LT1223 TPC20
R
1k
L
GAIN
–25
–20
–10
–5
0
10
15
PHASE
SHIFT
(DEGREES)
–225
–90
90
225
–180
–135
–45
0
45
135
180
PHASE
≥
R = 100
L
R
1k
L ≥
R = 100
L
V =
15V
RF = RG = 1k
S
±
FREQUENCY (Hz)
TOTAL
HARMONIC
DISTORTION
(%)
0.01
0.1
10
1k
10k
100k
LT1223 TPC21
0.001
100
THD
V =
15V
V = 7V
R = 400
RF = RG =1k
S
O
L
±
RMS
FREQUENCY (MHz)
1
–70
DISTORTION
(dBc)
–20
10
100
LT1223 TPC22
–60
–50
–40
–30
2ND
3RD
V =
15V
V = 2VP-P
R = 100
RF = 1k
A = 10dB
S
±
O
L
V
SETTLING TIME (ns)
0
–10
OUTPUT
STEP
(V)
–4
10
LT1223 TPC23
20
40
60
80
100
–8
–6
–2
0
2
4
6
8
TO 10mV
V
S
L
±
A = +1
RF = 1k
V =
15V
R = 1k
SETTLING TIME ( s)
0
–10
OUTPUT
STEP
(V)
–4
10
LT1223 TPC24
12
–8
–6
–2
0
2
4
6
8
TO 1mV
TO 1mV
A = +1
R = 1k
V =
15V
R = 1k
F
S
±
V
L
SETTLING TIME (ns)
0
–10
OUTPUT
STEP
(V)
–4
10
LT1223 TPC25
100
–8
–6
–2
0
2
4
6
8
TO 1mV
TO 10mV
A = –1
R = 1k
V =
15V
R = 1k
F
S
±
V
20
40
60
80
L
TO 10mV
TO 1mV
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