cx29600 Mindspeed Technologies, cx29600 Datasheet - Page 93

• Manufacturer Part Number: cx29600
• Description: Optiphytm - M155 Sts-3 Sonet/sdh Multiplexer
• Manufacturer: Mindspeed Technologies

CX29600
CX29600 Data Sheet
Figure 2-23. Single-ended PECL Diagram
29600-DSH-001-B
Note(s):
The termination network shown is valid for a 3.3 V PMD. For a 5.0 V PMD, please refer
to Figure 5-17.
3.3 V
Signal Detect
(SD)
PMD
2.7 TTL/PECL Interface
The LSigDet pin on the CX29600 line interface can be driven by TTL or PECL
drivers. The CX29600 can be connected directly to a TTL interface without
external components. When using a single-ended PECL interface, the input signal
must be centered around V
assumes a 3.3 V LIU. Resistors R1 and R2 are used set the low-level input
voltage, V
well below the minimum required by the CX29600. If an external driver/buffer is
used, it must provide a current return path to V
A typical LIU/PECL interface is shown in
Mindspeed Technologies
il
, going to the CX29600. The values shown set V
+3.3 V
R
R
1
2
= 130 Ω
= 82 Ω
sref
LSigDet
as shown in
Vsref
3.3 V
™
–
+
Table
CX29600
Figure
DD
5-18.
Internal
logic
to reduce noise issues.
2-23. This block diagram
2.0 Functional Description
500243_003
il
at 2.019 V, which is
2.7 TTL/PECL Interface
2-49