參數(shù)資料
型號(hào)： OM5808
廠商： NXP Semiconductors N.V.
英文描述： SDH/SONET Data clock Recovery(SDH/SONET 數(shù)據(jù)時(shí)鐘恢復(fù)單元 STM1/4/16 OC3/12/48 GE)
中文描述： SDH / SONET的時(shí)鐘數(shù)據(jù)恢復(fù)（SDH / SONET的數(shù)據(jù)時(shí)鐘恢復(fù)單元STM1/4/16 OC3/12/48通用電氣）
文件頁(yè)數(shù)： 21/52頁(yè)
文件大?。?/td> 1318K
代理商： OM5808
OM5808 demoboard negative supply for 2.5 Gb/s
TZA3014 / TZA3019 with HBCC package
Philips Semiconductors
21
Application Note
AN99071
3.1.1
TZA3014 general
The TZA3014 is a 2.5 Gb/s postamplifier with a digital Loss Of Signal detector and a Received Signal Strength
Indicator.
3.1.2
Power supply
P11-1: -3.3 volt, P11-2: GND, P11-3: not connected.
C1, C41, L12 and C12, C23, L7 are decoupling networks for the power supply.
Z1 is added to protect the circuit against over voltage.
C4 & L9 and C5 & L8 are local decoupling networks.
3.1.3
Input & output
The TZA3014 has a differential input which is AC coupled (C19 and C22). The input signal has to be connected
to the SMA connectors P5 & P6. The output of the TZA3014 is differential and is DC coupled, the output has to
be connected to SMA connectors P3 and P4. With R15 (LEVEL1) the output level can be adjusted.
3.1.4
LOS and RSSI
On the TZA3014, the digital Loss Of Signal output (LOS) is available on pin 27. The Received Signal Strength
Indicator (RSSI) is available on pin 26. These outputs can be observed at SMB connectors P9 (LOS) and P10
(RSSI). LOS: if the input signal level is below the threshold level, LOS1 (pin 27) will be high. When D1 is
connected to ground, using solder joint J1, the green LED will extinguish. If the LED is not used, resistor R11 has
to be connected to ground (J1) as load for pin 27.
3.1.5
S1 settings
When the mute function is used, switch S1-1 has to be switched off, if S1-1 is switched on the TZA3014 is muted
permanently. With switch S1-3 it is possible to invert output1.
3.1.6
S3 settings
With switch S3 the Loss Of Signal detector and the Received Signal Strength Indicator can be switched in active
or in power down mode. If S3 is switched to active mode, the decision level of the input level detector can be
adjusted by the resistor network R8 + R9.
Note: when the LOS and RSSI outputs are not used (S3 switched off), R1 has to be removed otherwise the
TZA3014 is muted permanently.
3.1.7
Mute
The TZA3014 has a mute function. The LOS output (pin 27) has to be connected to S1 (pin 31) via R1. When the
input signal is below the LOSTH1, the LOS output (pin 27) will be high. which forces S1 (pin 31) to be high. When
S1 (pin 31) is high the TZA3014 is muted.
Note: when the mute function is used, switch S1-1 has to be switched off and the LOS and RSSI (S3) must be in
active mode.
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