MAX3881 Maxim Integrated Products, MAX3881 Datasheet - Page 8

• Manufacturer Part Number: MAX3881
• Description: SDH/SONET 1:16 Deserializer
• Manufacturer: Maxim Integrated Products

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+3.3V, 2.488Gbps, SDH/SONET
1:16 Deserializer with Clock Recovery
50Ω termination (Figure 5). AC-coupling is also
required to maintain the input common-mode level.
The exposed-pad (EP), 64-pin TQFP incorporates fea-
tures that provide a very low thermal-resistance path for
heat removal from the IC. The pad is electrical ground
on the MAX3881 and must be soldered to the circuit
board for proper thermal and electrical performance.
For best performance, use good high-frequency layout
techniques. Filter voltage supplies, keep ground con-
nections short, and use multiple vias where possible.
Use controlled-impedance transmission lines to inter-
face with the MAX3881 high-speed inputs and outputs.
Power-supply decoupling should be placed as close to
V
care to isolate the input signals from the output signals.
Figure 4. Phase-Adjust Resistor-Divider
8
CC
_______________________________________________________________________________________
pins as possible. To reduce feedthrough, take
3.3V
PHADJ+ (PIN 5)
PHADJ- (PIN 6)
Exposed-Pad Package
MAX3881
Layout Techniques
Figure 5. Interfacing with PECL Input Levels
TRANSISTOR COUNT: 2231
PROCESS: BiPolar
LEVELS
PECL
0.1µF
0.1µF
25Ω
25Ω
100Ω
SDI+
SDI-
V
CC
Chip Information
MAX3881
50Ω
50Ω