參數(shù)資料
型號(hào)： LT1189C
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(yè)數(shù)： 8/12頁(yè)
文件大?。?/td> 349K
代理商： LT1189C
LT1189
8
The primary use of the LT1189 is in converting high speed
differential signals to a single-ended output. The LT1189
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 differential amplifier. The voltage gain of
the LT1189 is set like a conventional operational amplifier.
Feedback is applied to pin 8, and it is optimized for gains
of 10 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
±
170mV.
Power Supply Bypassing
The LT1189 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 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.
Figure 1. Simplified Input Stage Schematic
U
S
A
O
PPLICATI
U
U
V
+
7
6
LT1189
+/REF
–/FB
V
–
R
FB
4
1
8
OUT
V
+
–
3
2
IN
V
S/D
5
A
V
= +R
FB
+
7
6
LT1189
+/REF
–/FB
4
1
8
OUT
V
+
–
3
2
IN DIFF
V
S/D
5
R
FB
LT1189 AI01
7
6
LT1189
+/REF
–/FB
4
1
8
OUT
V
+
–
3
2
S/D
5
V
O
=
R
FB
+
R
FB
7
6
LT1189
+/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
–
LT1189 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
300
R
E
300
4 V
–
相關(guān)PDF資料
PDF描述
LT1189M Low Power Video Difference Amplifier
LT118 High Speed Operational Amplifier
LT1191CS8 Ultra High Speed Operational Amplifier
LT1191MJ8 Ultra High Speed Operational Amplifier
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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)
LT1189CS8#TR 功能描述:IC AMP VID DIFF CURR FDBK 8SOIC 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)
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