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參數(shù)資料
| 型號： | GS9015BCTJ |
| 廠商： | Gennum Corporation |
| 英文描述： | GENLINX-TM GS9015B Serial Digital Reclocker |
| 中文描述： | GENLINX -商標(biāo)GS9015B串行數(shù)字時鐘恢復(fù)器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 119K |
| 代理商： | GS9015BCTJ |
10 of 13
NOTRECOMMENDED
Mb/s to 400 Mb/s. For example, for 143 Mb/s data
rate, the value of the total RVCO resistance is approximately
6k8 and for 270 Mb/s operation, the value is
approximately 3k5. The 5k potentiometers will then tune
the desired data rate near their mid-points.
FORNEWDESGNS
For 143 Mb/s and 270 Mb/s operation, (the VCO is at
286 MHz and 270 MHz respectively) the total resistance
required is approximately the same for both data rates. This
also applies for 177 Mb/s and 360 Mb/s operation (the VCO
is tuned to 354 MHz and 360 MHz respectively). This means
that one potentiometer may be used for each frequency pair
with only a small variation of the fixed resistor value. This
halves the number of adjustments required.
32467 - 0
Fig. 13 GS9015B Typical Test Circuit Using -5V Supply
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
VCO Frequency Setting Resistors
There are two modes of VCO operation available in the
GS9015B depending on the state of the ÷2 block. The
÷2 block is enabled according to : ÷2 ENABLE = /2 SS1.
When the /2 ENABLE (pin 10) is LOW, any of the four VCO
frequency setting resistors, RVCO0 through RVCO3, (pins
Jitter performance at the lower data rates (143, 177 Mb/s) is
improved by operating the VCO at twice the normal frequency.
This is accomplished by enabling the divide by two block in
the PLL section of the GS9015B.
When /2 (Pin 10) is HIGH, two of the RVCO pins are assigned
to data rates below 200 Mb/s and two are assigned to data
rates over 200 Mb/s. The selection is dependent upon the
level of STANDARD SELECT BIT, SS1 (pin 21). When SS1
is LOW, RVCO0 and RVCO1 (pins 13 and 14) are used for
the higher data rates. When SS1 is HIGH, the VCO frequency
is now twice the bit rate and its frequency is set by RVCO2 and
RVCO3 (pins 15 and 17).
ECL
DATA
-5V
-5V
-5V
100
100
100
390
390
390
390
0.1μ
25
24
22
21
20
19
5
6
7
8
9
10
11
4 3 2 1 28 27 26
V
12 13 14 15 16 17 18
910
5.6p
10n
-5V
÷1
÷2
0.1μ
10k
DATA
CARRIER
DETECT
OUTPUT
DATA
CLOCK
GS9015B
DD
I
VCC1
VEE1
VEE1
/2
VEE3
SDO
SDO
SCO
SCO
SS1
SS0
CD
V
V
V
V
V
V
L
V
V
STAR
ROUTED
LOOP
VOLTAGE
See Figure 15
-5V
-5V
-5V
0.1μ
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