MAX3690 Maxim, MAX3690 Datasheet - Page 6

• Manufacturer Part Number: MAX3690
• Description: +3.3V / 622Mbps / SDH/SONET 8:1 Serializer with Clock Synthesis and TTL Inputs
• Manufacturer: Maxim

Figure 3 shows alternative PECL-output-termination
methods. Use Thevenin-equivalent termination when a
(V
coupling is necessary, be sure that the coupling
capacitor is placed following the 50
equivalent DC termination.
For best performance, use good high-frequency layout
techniques. Filter voltage supplies and keep ground
connections short. Use multiple vias where possible.
Also, use controlled-impedance transmission lines to
interface with the MAX3690 data outputs.
+3.3V, 622Mbps, SDH/SONET 8:1 Serializer
with Clock Synthesis and TTL Inputs
6
__________Applications Information
CC
_______________________________________________________________________________________
- 2V) termination voltage is not available. If AC
Alternative PECL-Output Termination
Layout Techniques
or Thevenin-
Figure 3. Alternative PECL-Output Termination
MAX3690
MAX3690
SD+
SD+
SD-
SD-
V
Z
Z
Z
Z
CC
+3.3V
0
0
0
0
= 50
= 50
= 50
= 50
- 2V
130
50
82
130
50
82
HIGH-
IMPEDENCE
INPUTS
PECL
INPUTS