參數資料
型號： OM5808
廠商： NXP Semiconductors N.V.
英文描述： SDH/SONET Data clock Recovery(SDH/SONET 數據時鐘恢復單元 STM1/4/16 OC3/12/48 GE)
中文描述： SDH / SONET的時鐘數據恢復（SDH / SONET的數據時鐘恢復單元STM1/4/16 OC3/12/48通用電氣）
文件頁數： 25/52頁
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
25
Application Note
AN99071
3.3.1
Option B: General
The TZA3019 is a 2.5 Gb/s dual postamplifier. Option “B” has one digital Loss Of Signal detector and one
Received Signal Strength Indicator. In this application the strongest input signal is will be switched to output1 and
the weakest to output2.
3.3.2
Description of the application
If the “auto switch” function is used, the RSSI of input2 must be in active mode and R11 must be connected to
ground using solder jumper J1. The signal strength of input2 sets the LOSTH1 of input1. When the input signal of
IN1 is above the threshold level, LOS1 (pin 27) will be low. This forces S1 & S2 (pin 31 & 30) to be low. Now
OUT1 is connected to IN1 and OUT2 is connected to IN2. If the input signal of IN1 is below the threshold level
LOS1 will be high. Now S1 & S2 are also high, OUT1 will be connected to IN2 and OUT2 will be connected to
IN1.
3.3.3
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, C5 & L8, C2 & L10 and C3 & L11 are local decoupling networks.
3.3.4
Inputs & outputs
The TZA3019B has two differential inputs which are AC coupled (C19, C22, C21 and C20). The input signals
should be connected to the SMA connectors P5 & P6 and P7 & P8. The two outputs of the TZA3019B are
differential and they are DC coupled, the outputs should be connected to SMA connectors P3 & P4 and P1 & P2.
With R15 (LEVEL1) and R16 (LEVEL2) the output level of each output can be adjusted.
3.3.5
S1 settings
By setting S1 the output configuration can be chosen. For each output, the input can be selected (S1-1 & S1-2).
It is also possible to invert the outputs (S1-3 & S1-4). Table 6 gives an overview of the possible S1 settings.
Note: when the “auto switch” function is used S1-1 and S1-2 must be switched off.
3.3.6
LOS1 and RSSI2
Option “B” has one digital Loss Of Signal output and one Received Signal Strength Indicator. LOS1 at pin 27 and
RSSI2 at pin 26. These outputs can be observed at SMB connectors P9 (LOS1) and P10 (RSSI2). If pin 11 is
connected to VEE or open the Received Signal Strength Indicator will be in power down mode. If pin 11 is above
VEE, the RSSI is active. In this application the input (pin11) is biased with R6.
TABLE 6 Settings of switch S1
S1-1
OUT1
off
input 1
on
input 2
S1-2
off
on
OUT2
input 2
input 1
S1-3
off
on
OUT1
OUT1
OUT1Q
S1-4
off
on
OUT2
OUT2
OUT2Q
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