參數(shù)資料
型號： LT1187IN8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 運動控制電子
英文描述： Low Power Video Difference Amplifi er
中文描述： OP-AMP, 12000 uV OFFSET-MAX, 5.7 MHz BAND WIDTH, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù)： 8/16頁
文件大?。?/td> 412K
代理商： LT1187IN8
LT1187
8
1187fa
APPLICATIONS INFORMATION
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
feedback. 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 0.1μF ceramic disc capacitor placed
1/2 inch from the amplifier is all that is required. In ap-
plications requiring good settling time, it is important to
use multiple bypass capacitors. A 0.1μF ceramic disc in
parallel with a 4.7μF 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
Ω
,
and R
REF
represents the finite source impedance from the
DC reference voltage, for V
REF
grounded, R
REF
= 0
Ω
. 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 con-
tributes only 2mV, since I
B
is less than 2μA.
V
+
7
6
LT1187
+/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
–
ILT1187 F01
+
1 REF
R
REF
R
G
8
R
FB
6
350 A
+
3
R
S
345 A
–
2
R
S
7 V
+
R
E
1.1k
R
E
1.1k
4 V
–
Q1
Q2
Q3
Q4
Figure 1. Simplified Input Stage Schematic
相關PDF資料
PDF描述
LT1188 10-bit Bus Interface Flip-Flops With 3-State Outputs 24-SOIC 0 to 70
LT1188C 1.5A High Side Switch
LT1188CK 1.5A High Side Switch
LT1188CT 1.5A High Side Switch
LT1188M 1.5A High Side Switch
相關代理商/技術參數(shù)
參數(shù)描述
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