Micrel, Inc. SY88923AV 5V/3.3V 3.2Gbps HIGH-SPEED SY88923AV LIMITING POST AMPLIFIER DESCRIPTION FEATURES Single 3.3V or 5V power supply The SY88923AV limiting post amplifier with its high gain and wide bandwidth is ideal for use as a post Up to 3.2Gbps operation amplifier in fiber-optic receivers with data rates up to Low noise PECL data outputs 3.2Gbps. Signals as small as 5mV can be amplified PP Chatter-free open collector TTL LOS output to drive devices with PECL inputs. The SY88923AV TTL /EN Input generates a chatter-free Loss-of-Signal (LOS) open collector TTL output. Differential PECL inputs for data The SY88923AV incorporates a programmable level Available in a tiny 10-pin (3mm) MSOP and 10-pin detect function to identify when the input signal has been (3mm) EPAD-MSOP lost. The LOS output will change from logic LOW to logic HIGH when input signal is smaller than the swing set by LOS . This information can be fed back to the EN input LVL of the device to maintain stability under loss-of-signal condition. Using LOS pin, the sensitivity of the level LVL APPLICATIONS detection can be adjusted. The LOS voltage can be set LVL by connecting a resistor divider between V and V CC REF 1.25Gbps and 2.5Gbps Gigabit Ethernet shown in Figure 3. Typical Operating Characteristics on 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel page 6 show the relationship between input level sensitivity and the voltage set on LOS 622Mbps SONET LVL. The LOS output is a TTL open collector output that Gigabit interface converter requires a pull-up resistor for proper operation, Figure 1. 2.5Gbps SDH/SONET 2.5Gbps proprietary links V CC SY88923AV Parallel 10G Ethernet 4.7k to 10k LOS Figure 1. LOS Output with Desired Rise Time BLOCK DIAGRAM D D IN OUT Limiting ECL Buffer Amplifer /D /D IN OUT V REF Enable /EN V CC Level GND Detect LOS LOS LVL Rev.: F Amendment: /0 M9999-110905 1 Issue Date: November 2005 hbwhelp micrel.com or (408) 955-1690Micrel, Inc. SY88923AV PACKAGE/ORDERING INFORMATION (1) Ordering Information /EN 1 10 VCC Package Operating Package Lead DIN 2 9 DOUT Part Number Type Range Marking Finish /DIN 3 8 /DOUT SY88923AVKC K10-1 Commercial 923AV Sn-Pb VREF 4 7 LOST (2) SY88923AVKCTR K10-1 Commercial 923AV Sn-Pb LOSLVL 5 6 GND SY88923AVEC K10-2 Commercial 923AV Sn-Pb (2) SY88923AVECTR K10-2 Commercial 923AV Sn-Pb 10-Pin MSOP (K10-1) (3) SY88923AVKG K10-1 Industrial 923AV with NiPdAu 10-Pin EPAD-MSOP (K10-2) Pb-free bar-line indicator Pb-Free (2, 3) SY88923AVKGTR K10-1 Industrial 923AV with NiPdAu Pb-free bar-line indicator Pb-Free (3) SY88923AVEY K10-2 Industrial 923AV with Matte-Sn Pb-free bar-line indicator Pb-Free (2, 3) SY88923AVEYTR K10-2 Industrial 923AV with Matte-Sn Pb-free bar-line indicator Pb-Free 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 DESCRIPTION Pin Number Pin Number MSOP EPAD-MSOP Pin Name Type Pin Function 1 1 /EN TTL Input Output Enable (Active Low). 2 2 DIN Data Input Data Input. 3 3 /DIN Data Input Inverting Data Input. 4 4 VREF Output Reference Voltage Output for LOS Level Set (see Figure 3). 5 5 LOSLVL Input LOS Limit Set. 6 6, GND Ground Ground. Exposed pad must be connected to PCB ground (Exposed Pad) plane. 7 7 LOS TTL Output Loss of Signal Indicator (Active High). (Open Collector) 8 8 /DOUT PECL Output Inverting Data Output. 9 9 DOUT PECL Output Data Output. 10 10 VCC Power Supply Positive Power Supply. M9999-110905 2 hbwhelp micrel.com or (408) 955-1690