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参数资料
| 型号： | TZA3000HL |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 数字传输电路 |
| 英文描述： | SDH/SONET STM4/OC12 optical receiver |
| 中文描述： | RECEIVER, PQFP32 |
| 文件页数： | 14/20页 |
| 文件大小： | 498K |
| 代理商： | TZA3000HL |
1997 Oct 17
14
Philips Semiconductors
Objective specification
SDH/SONET STM4/OC12 optical receiver
TZA3000
CML outputs: OUTCML (18) and OUTQCML (19)
The output impedance of the CML output driver is 100
(see Figs 7 and 9), which doesn’t match the characteristic
impedance of the strip line. While this means that the
reflections of some incident edges will arrive at the driver
output on the PCB, this value was selected to reduce
power dissipation inside the IC. The parallel combination
of 100
and 50
(33
)
will generate a signal swing of
200 mV peak-to-peak (single sided) with a tail current of
6 mA. If the output impedance was 50
rather than
100
, an 8 mA tail current would be needed to generate
the same voltage swing. This would increase power
dissipation by 33%.
If necessary, the output impedance of the generator can
be matched to the line impedance by connecting an
external 100
resistor in parallel with the output as shown
in Fig.10. The magnitude of the output voltage swing will
not change due to adaptive regulation. However, power
dissipation will increase by 33%.
Fig.9 CML interface circuit without matched impedance; low power dissipation.
handbook, full pagewidth
MGK888
VOQ
VO
VIQ
VI
100
100
50
50
VCC
VCC
Zo = 50
Zo = 50
generator
inside TZA3000
interconnect
PCB
receiver
inside TZA3004
Fig.10 CML interface circuit with matched impedance; higher power dissipation.
handbook, full pagewidth
MGK889
VOQ
VO
VIQ
VI
100
100
100
100
50
50
VCC
VCC
Zo = 50
Zo = 50
generator
inside TZA3000
interconnect
PCB
receiver
inside TZA3004
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|---|---|
| TZA3000U | SDH/SONET STM4/OC12 optical receiver |
| TZA3011A | TRANSIL |
| TZA3019AVH | TRANSIL |
| TZA3019BVH | TRANSIL |
| TZA3019CVH | TRANSIL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TZA3000U | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 optical receiver |
| TZA3001 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SDH/SONET STM1/OC3 and STM4/OC12 transceiver |
| TZA3001AHL | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 laser drivers |
| TZA3001BHL | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 laser drivers |
| TZA3001U | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SDH/SONET STM4/OC12 laser drivers |
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