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| 型號(hào)： | VSC7940RP |
| 廠商： | VITESSE SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 其它接口 |
| 英文描述： | SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 MM, TQFP-32 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 167K |
| 代理商： | VSC7940RP |
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VITESSE
Preliminary Data Sheet
VSC7940
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
G52357-0, Rev 3.2
05/11/01
Page 7
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Table 5: Pin Identifications
Pin Name
Pin Number
Description
GND
10, 15, 22,
23, 27
Ground
V
CC
1, 4, 7, 16, 18,
21, 25, 32
Power Supply
DATA+
2
Positive Data Input (PECL)
DATA-
3
Negative Data Input (PECL)
CLK+
5
Positive Clock Input (PECL). Connect to V
CC
if LATCH function is not used.
Negative Clock Input (PECL). Leave unconnected if LATCH function is not used.
CLK-
6
LATCH
8
Latch Input (TTL/CMOS). Connect to V
CC
for data retiming and GND for direct data.
Enable Input (TTL/CMOS). If used, connect DISABLE to GND. Connect to V
CC
for
normal operation and GND to disable laser bias and modulation currents.
ENABLE
9
DISABLE
10
Disable Input (TTL/CMOS). If used, leave ENABLE pin floating. Connect to GND for
normal operation and V
CC
to disable laser bias and modulation currents.
Bias Current Monitor. Sink current source that is proportional to the laser bias current.
BIASMON
11
MODMON
12
Modulation Current Monitor. Sink current source that is proportional to the laser
modulation current.
FAIL
13
Output (TTL/CMOS). When low, indicates APC failure.
APCFILT
14
No effect on device operation.
BIAS
17
Laser Bias Current Output
OUT+
19
Positive Modulation-Current Output. I
MOD
flows when input data is high.
Negative Modulation-Current Output. I
MOD
flows when input data is low.
Monitor Diode Input. Connect to monitor photodiode anode. Connect capacitor to GND to
filter high-speed AC monitor photocurrent.
OUT-
20
MD
24
CAPC
26
Capacitor to GND sets dominant pole of the APC feedback loop.
RESERVED
28
Do not connect.
APCSET
29
Resistor to GND sets desired average optical power. If APC is not used, connect 100k
resistor to GND.
MODSET
30
Connect resistor to GND to set desired modulation current.
BIASMAX
31
Connect resistor to GND to set maximum bias current. The APC function can subtract from
this value, but cannot add to it.
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| VSC7940W | 制造商:VITESSE 制造商全稱(chēng):Vitesse Semiconductor Corporation 功能描述:SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control |
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