cx28250 Mindspeed Technologies, cx28250 Datasheet - Page 40

• Manufacturer Part Number: cx28250
• Description: Cx28250 Atm Physical Interface Phy Devices
• Manufacturer: Mindspeed Technologies

2.0 Functional Description
2.1 Line Interface
Figure 2-3. CX28250 Low Voltage PECL (LVPECL) Interface
2-4
Note(s):
1. The 100 ohm resistor is built in the CX28250 for the LRxData+ and LRxData- termination.
2. The LTxData+ and LTxData- outputs are internally biased and therefore do not require external bias resistors.
3. The termination resistors on the LSigDet input are necessary only for transceivers with a PECL level
3.3 V
signal detect (SD) output.
Optical Transceiver
RD+
TD+
RD-
TD-
SD
Place near Transceiver
130R
100R
Mindspeed Technologies
130R
Place near CX28250
Z=50
Z=50
Z=50
Z=50
130R
82R
Vcc(3.3
V)
™
ATM Physical Interface (PHY) Devices
LRxData+
LRxData-
LTxData+
LTxData-
LSigDet
3.3 V
100R
CX28250-23, -25
28250-DSH-002-C
CX28250
500035_054