參數(shù)資料
型號(hào): LMH6718MA
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 緩沖放大器
英文描述: 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述: DUAL BUFFER AMPLIFIER, PDSO8
封裝: SOIC-8
文件頁(yè)數(shù): 14/16頁(yè)
文件大?。?/td> 846K
代理商: LMH6718MA
Application Circuits
SINGLE SUPPLY CABLE DRIVER
Figure 14
below shows the LMH6718 driving 10m of 75
coaxial cable. The LMH6718 is set for a gain of +2V/V to
compensate for the divide-by-two voltage drop at V
O
. The
response after 10m of cable is illustrated in
Figure 15
DIFFERENTIAL LINE DRIVER WITH LOAD IMPEDANCE
CONVERSION
The circuit shown in
Figure 16
, operates as a differential line
driver. The transformer converts the load impedance to a
value that best matches the LMH6718’s output capabilities.
The single-ended input signal is converted to a differential
signal by the LMH6718. The line’s characteristic impedance
is matched at both the input and the output. The schematic
shows Unshielded Twisted Pair for the transmission line;
other types of lines can also be driven.
Set up the LMH6718 as a difference amplifier:
Set the Channel 1 amplifier to a gain of +1V/V
Set the Channel 2 amplifier to a gain of 1V/V
Make the best use of the LMH6718’s output drive capability
as follows:
where R
eq
is the transformed value of the load impedance,
V
max
is the output Voltage Range, and I
max
is the maximum
Output Current.
Match the line’s characteristic impedance:
Select the transformer so that it loads the line with a value
very near Z
over frequency range. The output impedance
of the LMH6718 also affects the match. With an ideal trans-
former we obtain:
where Z
(6718)(j
ω
) is the output impedance of the
LMH6718 and |Z
O
(6718)(j
ω
)|
<<
R
m
.
The load voltage and current will fall in the ranges:
The LMH6718’s high output drive current and low distortion
make it a good choice for this application.
20040153
FIGURE 14. Single Supply Cable Driver
20040154
FIGURE 15. Response After 10m of Cable
20040155
FIGURE 16. Differential Line Driver with Load
Impedance Conversion
L
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14
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