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參數(shù)資料
| 型號： | LT1187M |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 運(yùn)動(dòng)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)： | 8/12頁 |
| 文件大?。?/td> | 385K |
| 代理商： | LT1187M |
LT1187
8
APPLICATIU
The primary use of the LT1187 is in converting high speed
differential signals to a single-ended output. The LT1187
video difference amplifier has two uncommitted high input
impedance (+) and (–) inputs. The amplifier has another
set of inputs which can be used for reference and feed-
back. Additionally, this set of inputs give gain adjust and
DC control to the difference amplifier. The voltage gain of
the LT1187 is set like a conventional operational amplifier.
Feedback is applied to pin 8, and it is optimized for gains
of 2 or greater. The amplifier can be operated single-ended
by connecting either the (+) or (–) inputs to the +/REF (pin
1). The voltage gain is set by the resistors: (R
FB
+ R
G
)/R
G
.
Like the single-ended case, the differential voltage gain is
set by the external resistors: (R
FB
+ R
G
)/R
G
. The maximum
input differential signal for which the output will respond
is approximately
±
0.38V.
Power Supply Bypassing
The LT1187 is quite tolerant of power supply bypassing.
In some applications a 0.1
μ
F ceramic disc capacitor
placed 1/2 inch from the amplifier is all that is required. In
applications requiring good settling time, it is important to
use multiple bypass capacitors. A 0.1
μ
F ceramic disc in
parallel with a 4.7
μ
F tantalum is recommended.
Calculating the Output Offset Voltage
Both input stages contribute to the output offset voltage at
pin 6. The feedback correction forces balance in the input
stages by introducing an Input V
OS
at pin 8. The complete
expression for the output offset voltage is:
V
OUT
= (V
OS
+ I
OS
(R
S
) + I
B
(R
REF
))
×
(R
FB
+R
G
)/R
G
+ I
B
(R
FB
)
R
S
represents the input source resistance, typically 75
,
and R
REF
represents the finite source impedance from the
DC reference voltage, for V
REF
grounded, R
REF
= 0
. The
I
OS
is normally a small contributor and the expression
simplifies to:
V
OUT
= V
OS
(R
FB
+R
G
)/R
G
+ I
B
(R
FB
)
If R
FB
is limited to 1k the last term of the equation
contributes only 2mV, since I
B
is less than 2
μ
A.
U
W
U
ILT1187 AI02
+
1 REF
R
REF
R
G
8
R
FB
6
350
μ
A
Q3
Q4
+
3
R
S
345
μ
A
Q1
Q2
–
2
R
S
7 V
+
R
E
1.1k
R
E
1.1k
4 V
–
Figure 1. Simplified Input Stage Schematic
V
+
7
6
+/REF
–/FB
V
–
R
FB
4
1
8
OUT
V
+
–
3
2
IN
V
S/D
5
A
V
= +R
FB
+
7
6
LT1187
+/REF
–/FB
4
1
8
OUT
V
+
–
3
2
IN DIFF
V
S/D
5
R
FB
LT1187 AI01
7
6
LT1187
+/REF
–/FB
4
1
8
OUT
V
+
–
3
2
S/D
5
V
O
=
R
FB
+
R
FB
7
6
LT1187
+/REF
–/FB
4
1
8
OUT
V
+
–
3
2
IN
V
S/D
5
A
V
= –R
FB
+
R
FB
IN
V
IN
V
(
(
V
IN DIFF
R
FB
R
G
(
(
V
IN
R
G
R
G
R
G
V
O
= (V
R
FB
+
IN DIFF
+ V
IN
)
R
G
R
G
R
G
IN DIFF
V
R
G
R
G
R
G
–
R
G
R
G
R
G
V
+
V
–
V
+
V
–
V
+
V
–
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(dòng)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(dòng)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(dòng)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(dòng)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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