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參數(shù)資料
| 型號： | LT1187M |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Power Video Difference Amplifier |
| 中文描述： | 低功耗視頻差分放大器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 385K |
| 代理商： | LT1187M |
9
LT1187
APPLICATIU
U
W
U
Operating with Low Closed-Loop Gains
The LT1187 has been optimized for closed-loop gains of
2 or greater. For a closed-loop gain of 2 the response
peaks about 2dB. Peaking can be eliminated by placing a
capacitor across the feedback resistor, (feedback zero).
This peaking shows up as time domain overshoot of
about 25%.
Closed-Loop Voltage Gain vs Frequency
Small-Signal Transient Response
Small-Signal Transient Response
Extending the Input Range
Figure 1 shows a simplified schematic of the LT1187. In
normal operation the REF pin 1 is grounded or taken to a
DC offset control voltage and differential signals are ap-
plied between pins 2 and 3. The input responds linearly
until all of the 345
μ
A current flows through the 1.1k
resistor and Q1 (or Q2) turns off. Therefore the maximum
input swing is 380mV
P
or 760mV
P-P
. The second differen-
tial pair, Q3 and Q4, is running at slightly larger current so
that when the first input stage limits, the second stage
remains biased to maintain the feedback.
Occasionally it is necessary to handle signals larger than
760mV
P-P
at the input. The LT1187 input stage can be
tricked to handle up to 1.5V
P-P
. To do this, it is necessary
to ground pin 3 and apply the differential input signal
between pin 1 and 2. The input signal is now applied
across two 1.1k resistors in series. Since the input signal
is applied to both input pairs, the first pair will run out of
bias current before the second pair, causing the amplifier
to go open-loop. The results of this technique are shown
in the following scope photo.
FREQUENCY (Hz)
C
9
8
LT1187 AI03
100M
10M
1M
100k
7
5
–1
1
0
3
V
S
= ±5V
T
A
= 25°C
A
V
= 2
R
FB
= 900
R
G
= 900
C
FB
= 0pF
2
4
6
C
FB
= 10pF
C
FB
= 5pF
A
V
= 2, OVERSHOOT = 25%, R
FB
= R
G
= 1k
LT1187 AI04
A
V
= 2, WITH 8pF FEEDBACK CAPACITOR
LT1187 AI05
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1187MJ8 | Low Power Video Difference Amplifier |
| LT1187CN8 | Low Power Video Difference Amplifier |
| LT1189CN8 | Low Power Video Difference Amplifier |
| LT1189CS8 | Low Power Video Difference Amplifier |
| LT1189CJ8 | Low Power Video Difference Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1187MJ8 | 制造商:Linear Technology 功能描述:Video Amp Single ±9V 18V 8-Pin CDIP |
| LT1189CN8 | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| LT1189CN8#PBF | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| LT1189CS8 | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| LT1189CS8#PBF | 功能描述:IC AMP VIDEO DIFFRNC ADJ 8-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
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