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| 型號(hào)： | EPIC |
| 英文描述： | EPiC Family Product Line (304k) |
| 中文描述： | 史詩(shī)系列產(chǎn)品線（304k） |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 304K |
| 代理商： | EPIC |
8
www.semtech.com
HIGH PERFORMANCE PRODUCTS
Revision 1/December 3, 2001
AN1001
The 50
W source (or series) termination output struc-
ture is optimized for applications with the following char-
acteristics:
a)
point-to-point routing of differential signals (al
though, it functions for single-ended applica-
tions
with Q* left disconnected)
b)
50
W transmission lines
This output configuration does not require any termi-
nation resistor at the destination. In fact, it does not
require any external components at all.
It is suitable for high-speed data and clock distribu-
tion, where double termination is not required.
Note: The source terminated output also works in the double
termination environment. However, as a source termination
it requires internal 8mA current source, and double termina-
tion requires only 6mA, additional power is consumed with no
corresponding performance gain.
Q
Zo
6 mA
Q*
Rext
RT = 2* Zo
Rext
Zo
6 mA
4) Internal Current Sink (Double Termination)
This output structure is a modified version of the 50
W
double termination output. Accordingly, it is used in
applications that require:
1)
point-to-point routing of a differential signal
2)
series and parallel termination.
However, as the series termination resistors are not
on-chip, this output should be selected in two specific
cases:
a)
Non-50
W transmission lines. Use appropriate
external resistors to match the line impedance.
b)
Ultra high fidelity applications, in situations
where the source impedance and line imped
ance must match extremely close, precision
The 44XX family supports two distinct input options
for the IN<0-3> signals.
1) High Impedance
IN
IN*
This configuration is a standard high impedance input.
It is flexible in that it can be used in:
a) multiple destination (display chain), as well as
point-to-point applications
b) transmission line environments of a wide range
of characteristic impedances (with the appropriate
external termination scheme, see AN1003)
c)
single-ended applications (with the appropriate
VBB brought into CLK*).
2) 100
W Termination
IN
IN*
100
Input Configuration Options
Output Configuration Options (con’d)
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