參數(shù)資料
型號(hào)： TRCV012G7
元件分類： 運(yùn)動(dòng)控制電子
英文描述： TRCV012G5 (2.5 Gbits/s) and TRCV012G7 (2.5 Gbits/s and 2.7 Gbits/s) Limiting Amplifier, Clock Recovery, 1:16 Data Demultiplexer
中文描述： TRCV012G5（2.5 Gb /秒）和TRCV012G7（2.5 Gb /秒和2.7 Gb /秒）限幅放大器，時(shí)鐘恢復(fù)，1:16數(shù)據(jù)復(fù)用器
文件頁(yè)數(shù)： 18/28頁(yè)
文件大小： 500K
代理商： TRCV012G7
TRCV012G5 and TRCV012G7
Limiting Amplifier, Clock Recovery, 1:16 Data Demultiplexer
Preliminary Data Sheet
August 2000
18
Lucent Technologies Inc.
CML Output Structure (Used on Pins D2G5P/N, CK2G5P/N)
The CML architecture is essentially a current-steering mechanism combined with an amplifier. This makes the out-
put swing of the signal a function of the termination resistor and the programmable output current. The user should
connect external termination resistors from the CML output pins to V
CC
. The on-chip, 100
pull-up resistors pro-
vide a dc path when using an ac-coupled load.
The voltage swing of a CML signal is typically 400 mV, half that of ECL/PECL. The lower pulse amplitude reduces
noise transients, crosstalk, and EMI. It also uses half the amount of current through the termination resistors. The
schematic of a typical CML output structure is shown in Figure 9.
5-8065(F)r.2
Figure 9. Typical CML Output Structure
Choosing the Value of the External CML Reference Resistors (RREF1, RREF2)
The flexibility of the CML interface permits certain parameters to be customized for a particular application. The
RREF1
resistor controls the CML output driver current source. Adjusting this tail current and termination resistors
will allow signal amplitude control (see the CML output specifications for limitations, page 22 and page 24) and
flexibility in termination schemes.
With RREF2 set to 1.5 k
, the equation for the CML output current is the following:
Iout = (18)*(1.21)/RREF1
The CML outputs have on-chip 100
load resistors to V
CC
in order to accommodate capacitive ac coupling. With
a 50
1% load, the effective load resistance will be 33.33
± 6%. For a 400 mV voltage swing into the 50
load,
set RREF1 to 1.8 k
. For a 600 mV voltage swing, set RREF1 to 1.2 k
. In both cases, RREF2 remains fixed at a
value of 1.5 k
.
DEVICE-INTERNAL CML OUTPUT BUFFER CIRCUIT
EXTERNAL OUTPUT TERMINATION
V
CC
V
CC
50
50
V
CC
V
CC
100
100
VREF
18X
V
CC
RREF1
RREF2
+
–
I
OUT
I
OUT
相關(guān)PDF資料
PDF描述
TRCV012G5 Limiting Amplifier, Clock Recovery, 1:16 Data Demultiplexer(2.5 Gbits/s)(限幅放大器，時(shí)鐘恢復(fù)，1：16數(shù)據(jù)多路分解器(2.5 G位/秒))
TRCV012G7 Limiting Amplifier, Clock Recovery, 1:16 Data Demultiplexer(2.5 Gbits/s and 2.7 Gbits/s)(限幅放大器，時(shí)鐘恢復(fù)，1：16數(shù)據(jù)多路分解器(2.5 G位/秒和 2.7 G位/秒))
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