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參數(shù)資料
| 型號： | LT1207CS#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC CURRNT FEEDBK AMP DUAL 16SOIC |
| 標準包裝： | 50 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 900 V/µs |
| -3db帶寬： | 60MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 20mA |
| 電流 - 輸出 / 通道： | 1.2A |
| 電壓 - 電源，單路/雙路(±)： | 10 V ~ 30 V，±5 V ~ 15 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SO |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1317 (CN2011-ZH PDF) |
10
LT1207
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and for higher gains in the noninverting mode, the signal
amplitude on the input pins is small and the overall slew
rate is that of the output stage. The input stage slew rate
is related to the quiescent current and will be reduced as
the supply current is reduced. The output slew rate is set
by the value of the feedback resistors and the internal
capacitance. Larger feedback resistors will reduce the
slew rate as will lower supply voltages, similar to the way
the bandwidth is reduced. The photos (Figures 5a, 5b and
5c) show the large-signal response of the LT1207 or
various gain configurations. The slew rate varies from
860V/
s for a gain of 1, to 1400V/s for a gain of –1.
When the LT1207 is used to drive capacitive loads, the
available output current can limit the overall slew rate. In
the fastest configuration, the LT1207 is capable of a slew
rate of over 1V/ns. The current required to slew a capacitor
Figure 5b. Large-Signal Response, AV = –1
LT1207 F05b
RF = RG = 750
RL = 50
VS = ±15V
The amplifier’s supply current will be approximately 40
times the current in the Shutdown pin. The voltage across
the resistor in this condition is V+ – 3VBE. For example, a
60k resistor will set the amplifier’s supply current to 10mA
with VS = ±15V.
The photos (Figures 4a and 4b) show the effect of reducing
the quiescent supply current on the large-signal response.
The quiescent current can be reduced to 5mA in the
inverting configuration without much change in response.
In noninverting mode, however, the slew rate is reduced
as the quiescent current is reduced.
Figure 4a. Large-Signal Response vs IQ, AV = –1
Figure 4b. Large-Signal Response vs IQ, AV = 2
LT1207 F04a
RF = 750
RL = 50
IQ = 5mA, 10mA, 20mA
VS = ±15V
LT1207 F04b
RF = 750
RL = 50
IQ = 5mA, 10mA, 20mA
VS = ±15V
Slew Rate
Unlike a traditional op amp, the slew rate of a current
feedback amplifier is not independent of the amplifier gain
configuration. There are slew rate limitations in both the
input stage and the output stage. In the inverting mode,
LT1207 F05a
RF = 825
RL = 50
VS = ±15V
Figure 5a. Large-Signal Response, AV = 1
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