SY88933VKG Microchip

3.3V/5V 1.25Gbps PECL LOW-POWER Micrel, Inc. SY88933V LIMITING POST AMPLIFIER SY88933V WITH TTL SIGNAL DETECT FEATURES DESCRIPTION Single 3.3V or 5V power supply The SY88933V low-power limiting post amplifier is DC to 1.25Gbps operation designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers (TIAs). The Low noise PECL data outputs linear signal output from TIAs can contain significant Chatter-free OC-TTL signal setect (SD) output with amounts of noise and may vary in amplitude over time. internal 6.75k pull-up resistor The SY88933V quantizes these signals and outputs PECL TTL EN input level waveforms. Programmable SD level set (SD ) LVL The SY88933V operates from a single +3.3V or +5V Available in a tiny 10-pin MSOP (3mm) package power supply, over temperatures ranging from 40C to +85C. With its wide bandwidth and high gain, signals with data rates up to 1.25Gbps and as small as 5mVp-p can be amplified to drive devices with PECL inputs. The SY88933V generates a TTL SD output. A programmable signal-detect level set pin (SD ) sets LVL APPLICATIONS the sensitivity of the input amplitude detection. SD asserts high if the input amplitude rises above the threshold set 1.25Gbps Ethernet by SD and deasserts low otherwise. EN deasserts LVL 1.55Mbps and 622Mbps SONET/SDH the true output signal without removing the input signal. Typically, 4.6dB SD hysteresis is provided to prevent High-gain line driver and line receiver chattering. 531Mbps and 1062Mbps Fibre Channel Gigabit interface converter TYPICAL APPLICATIONS CIRCUIT V CC SD EN D D 0.1F 0.1F IN OUT From To Transimpedance /D /D 0.1F CDR 0.1F IN SY88933V OUT Amp. SD V 50 50 LVL REF R R pd pd V CC GND GND 0.1F 100k For 3.3V, R = 120 pd For 5V, R = 220 pd Rev.: D Amendment: /0 M9999-011508 Issue Date: January 2008 1 hbwhelp micrel.com or (408) 955-1690SY88933V Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information EN 1 10 VCC Package Operating Package Lead Part Number Type Range Marking Finish DIN 2 9 DOUT SY88933VKC K10-1 Commercial 933V Sn-Pb /DIN 3 8 /DOUT (1) SY88933VKCTR K10-1 Commercial 933V Sn-Pb VREF 4 7 SD SY88933VKI K10-1 Industrial 933V Sn-Pb SDLVL 5 6 GND (1) SY88933VKITR K10-1 Industrial 933V Sn-Pb (2) SY88933VKG K10-1 Industrial 933V with Pb-Free 10-Pin MSOP (K10-1) Pb-Free bar-line indicator NiPdAu (1, 2) SY88933VKGTR K10-1 Industrial 933V with Pb-Free Pb-Free bar-line indicator NiPdAu Note: 1. Tape and Reel. 2. Pb-Free package is recommended for new designs. PIN DESCRIPTION Pin Number Pin Name Type Pin Function 1EN TTL Input: Enable: Asserts true data output when high. Default is high. 2 DIN Data Input True data input. 3 /DIN Data Input Complementary data input. 4 VREF Reference voltage: capacitor here to V helps stabilize SD . CC LVL 5 SDLVL Input Signal-Detect Level Set: a resistor from this pin to V sets the CC threshold for the data input amplitude at which SD will be asserted. 6GND Ground Device ground. 7SD Open-collector Signal-Detect: asserts high when the data input amplitude rises above TTL output w/ the threshold set by SD . LVL internal 6.75k pull-up resistor 8 /DOUT PECL Output Complementary data output. 9 DOUT PECL Output True data output. 10 VCC Power Supply Positive power supply. M9999-011508 2 hbwhelp micrel.com or (408) 955-1690