SY88923VKG

Micrel, Inc. SY88923V 5V/3.3V 2.5Gbps HIGH-SPEED SY88923V LIMITING POST AMPLIFIER DESCRIPTION FEATURES 3.3V and 5V power supply options The SY88923V limiting post amplifier with its high gain and wide bandwidth is ideal for use as a post amplifier in Up to 2.5Gbps operation fiber-optic receivers with data rates up to 2.5Gbps. Low noise Signals as small as 5mV can be amplified to drive PP Chatter-Free LOS Generation devices with PECL inputs. The SY88923V generates a Open Collector TTL LOS Output chatter-free Loss of Signal (LOS) open collector TTL output. TTL /EN Input The SY88923V incorporates a programmable level detect Differential PECL inputs for data function to identify when the input signal has been lost. Single power supply The LOS output will change from logic LOW to logic Designed for use with Micrel s Laser Diode Driver HIGH when input signal is smaller than the swing set by and Controller LOS . This information can be fed back to the EN input LVL of the device to maintain stability under loss of signal Available in a tiny 10-pin (3mm) MSOP condition. Using LOS pin, the sensitivity of the level LVL detection can be adjusted. The LOS voltage can be set LVL APPLICATIONS by connecting a resistor divider between V and V CC REF show in Figure 3. Performance Curves show the relationship 1.25Gbps and 2.5Gbps Gigabit Ethernet between input level sensitivity and the voltage set on 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel LOS LVL. The LOS output is a TTL open collector output that 622Mbps SONET requires a pull-up resistor for proper operation, Figure 1. Gigabit Interface Converter 2.5Gbps SDH/SONET V CC SY88923V 2.5Gbps Proprietary Links 2.5k LOS Figure 1. LOS Output with Desired Rise Time BLOCK DIAGRAM D D IN OUT ECL Limiting Amplifer Buffer /D /D IN OUT V REF Enable /EN V CC Level GND Detect LOS LOS LVL Rev.: E Amendment: /0 M9999-051706 1 Issue Date: May 2006 hbwhelp micrel.com or (408) 955-1690Micrel, Inc. SY88923V PACKAGE/ORDERING INFORMATION (1) Ordering Information /EN 1 10 VCC Package Operating Package Lead Part Number Type Range Marking Finish DIN 2 9 DOUT MSOP SY88923VKC K10-1 Commercial 923V Sn-Pb /DIN 3 8 /DOUT K10-1 (2) SY88923VKCTR K10-1 Commercial 923V Sn-Pb VREF 4 7 LOS (3) SY88923VKG K10-1 Industrial 923V with Pb-Free LOSLVL 5 6 GND Pb-Free bar-line indicator NiPdAu (2, 3) SY88923VKGTR K10-1 Industrial 923V with Pb-Free 10-Pin MSOP (K10-1) Pb-Free bar-line indicator NiPdAu Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25C, DC Electricals only. A 2. Tape and Reel. 3. Pb-Free package is recommended for new designs. PIN NAMES GENERAL DESCRIPTION General Pin Type Function The SY88923V is an integrated limiting amplifier intended D Data Input Data Input IN for high-frequency fiber-optic applications. The circuit /D Data Input Inverting Data Input IN connects to typical trans-impedance amplifiers found within LOS Input LOS Limit Set a fiber-optics link. The linear signal output from a trans- LVL impedance amplifier can contain significant amounts of noise, /EN TTL Input Output Enable (Active Low) and may vary in amplitude over time. The SY88923V limiting LOS TTL Output Loss of Signal Indicator amplifier quantizes the signal and outputs a voltage-limited (Open Collector) (Active High) waveform. GND Ground Ground The /EN pin allows the user to disable the output signal without removing the input signal. /D PECL Output Inverting Data Output OUT D PECL Output Data Output OUT V Power Supply Positive Power Supply CC V Output Reference Voltage Output for REF LOS Level Set (see Fig. 3) (1) ABSOLUTE MAXIMUM RATINGS Symbol Rating Value Unit V Power Supply Voltage 0 to +7.0 V CC D , /D Input Voltage 0 to V V IN IN CC D , /D Output Voltage (with 50 load) V 2.5 to V +0.3 V OUT OUT CC CC /EN Input Voltage 0 to V V CC LOS Input Voltage 0 to V V LVL CC V Output Voltage V 2.0 to V V REF CC CC T Operating Temperature Range 40 to +85 C A T Storage Temperature Range 55 to +125 C store Note: 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device reliability. M9999-051706 2 hbwhelp micrel.com or (408) 955-1690