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參數(shù)資料
| 型號： | TZA3040 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | XO, clock |
| 英文描述： | SDH/SONET data and clock recovery unit STM1/4 OC3/12 |
| 中文描述： | SDH / SONET的數(shù)據(jù)和時鐘恢復(fù)單元STM1 / 4 OC3/12 |
| 文件頁數(shù)： | 14/54頁 |
| 文件大?。?/td> | 1852K |
| 代理商： | TZA3040 |
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14
Fiber optic transceiver board STM1/4/8,
OC3,12,24, FC/GE
Philips Semiconductors
Application Note
AN98090
1.4.3
Mounting of the laserdiode
Standard, the board is tested electrically. The bias & modulation source are then terminated to VCC with a
dummy load. After test pass, these resistors are removed.
Fig.3 Enlargement of the transmitter section. The top layer is shown in top view. The picture shows the footprint of the used
laser with corresponding pin-functionality.
1.4.4
Supply voltages
Standard, the board is tested on 5.0 V supply voltages. The supply voltages selectors on the bottom side of the
PCB are set to this.
If other voltages are required, please follow the description in section 3.3.
1.4.5
Back to back sensitivity measurement: Laserdriver in - DCR out
In this measurements 2 aspects have to be taken into account:
1.
Polarity inversion in the path from SMA connectors to light output
The SMA connectors LDR DIN / LDR DINQ are connected via a resistive splitter to the outputs of the
multiplexer (TXDQ / TXSD) and the inputs of the laserdriver (DIN/DINQ). When the multiplexer is turned off,
the signal on the connector drives the corresponding laserdriver inputs (LDR DIN - DIN and LDR DINQ -
DINQ).
Note that the “Q” output of the multiplexer is connected to the “normal” input of the laserdriver. The
laserdriver inverts the output of the multiplexer!
To correct for this, the LAQ output is connected to the laser, and the LA output can be monitored at the SMA
connector LA.
IF A PATTERN GENERATOR OUTPUT IS CONNECTED WITH THE ‘LDR DIN/LDR DINQ’ INPUTS, A
SIGNAL INVERSION OCCURS. THIS SHOULD BE TAKEN INTO ACCOUNT WHEN PERFORMING A BIT
ERROR TEST.
2.
Turning off the output of the multiplexer & keeping the 19 MHz from the synthesizer
The test signal STOPTX from the multiplexer TZA3005 turns both the output stages and the synthesizers
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θ
Peltier
cathode
anode
TOP VIEW
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