LevelOne GVT-0201 Datasheet - Page 3

Block Diagram of Transceiver DATA DATA/ TX_DISABLE TX_FAULT (0) (1) (2) ELECTRICAL SUBASSEMBLY LD Driver & Fault Sense LASER MOD_DEF OPTICAL SUB- ASSEMBLIES DUPLEX SC RECEPTACLE DATA DATA/ RX_LOS POST-Amp & LOS Detect RREAMPLIFIER IC Photo Diode TOP VIEW (Label side) Transmitter Section The transmitter section consists of a 1310 nm InGaAsP laser in an eye safe optical subassembly (OSA) which mates to the fiber cable. The laser OSA is driven by a LD driver IC which converts differential input LVPECL (3.3V) or PECL (5V) logic signals into an analog laser driving current. TX_DISABLE The TX_DISABLE signal is high (TTL logic "1") to turn off the laser output. The laser will turn on when TX_DISABLE is low (TTL logic "0"). Receiver Section The receiver utilizes an InGaAs PIN photodiode mounted together with a trans-impedance preamplifier IC in an OSA. This OSA is connected to a circuit providing post-amplification quantization, and optical signal detection. Receive Loss (RX_LOS) The RX_LOS is high (logic "1") when there is no incoming light from the companion transceiver. This signal is normally used by the system for the diagnostic purpose. The signal is operated in TTL level. Dimensions ALL DIMENSIONS ARE±0.20mm UNLESS OTHERWISE SPECIFIED Unit: mm 4