MAX3969 19-3251 Rev 1 6/06 200Mbps SFP Limiting Amplifier General Description Features The MAX3969 limiting amplifier with PECL data outputs is 1mV Input Sensitivity P-P ideal for low-cost ATM, Fast Ethernet, FDDI and ESCON Loss-of-Signal Detector with Programmable fiber optic receivers. Threshold The MAX3969 features 1mV input sensitivity and an P-P integrated power detector that senses the input signal TTL LOS and PECL Signal Detect power. It provides a received-signal-strength indicator Analog Received-Signal-Strength Indicator (RSSI), which is an analog indication of the power level. Signal strength is also indicated by the complementary Output Squelch Function TTL loss-of-signal (LOS) outputs and the PECL signal- Compatible with 4B/5B Data Coding detect (SD) output, both of which indicate the power level relative to a programmable threshold. The threshold can be adjusted to detect signal ampli- tudes as low as 2.7mV . An optional squelch function P-P disables switching of the data outputs by holding them Ordering Information at a known state when the signal is below the pro- grammed threshold. PIN- PART TEMP RANGE PKG CODE The MAX3969 is available in die form and a 4mm x PACKAGE 4mm, 20-pin thin QFN package. MAX3969ETP -40C to +85C 20 Thin QFN T2044-2 MAX3969E/D Dice* Applications *Dice are designed to operate over a -40C to +100C junction SFP/SFF Transceivers temperature (T ) range, but are tested and guaranteed only at J Fast Ethernet/FDDI Transceivers T = +25C. A 155Mbps LAN ATM Transceivers ESCON Receivers FTTx Transceivers Typical Application Circuits SFP OPTICAL RECEIVER WITH DIAGNOSTICS HOST BOARD V CC C AZ +2.97V TO +3.63V 1F C FILTER DIAGNOSTIC 0.1F 0.01F MONITOR R LOS 4.7k CZP CZN FILTER V V CC CCO TO LOS 10k LOS SQUELCH CIN 4700pF SD MAX3969 0.1F FILT OUT- IN- OUT- TRANSIMPEDANCE AMPLIFIER IN OUT+ IN+ OUT+ C 0.1F IN INV V EP* GND TH 4700pF 150 150 R1 100k R2 *EXPOSED PAD (EP) ON MAX3969ETP ONLY. Typical Application Circuits continued at end of data sheet. Pin Configuration appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE200Mbps SFP Limiting Amplifier ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage Range (V , V ) ..........-0.5V to +7.0V Continuous Power Dissipation (T = +85C) CC CCO A Voltage at FILTER, RSSI, IN+, IN-, CZP, CZN, SQUELCH, 20-Pin Thin QFN (derate 16.9mW/C above +85C) ....1099mW INV, V ..................................................-0.5V to (V + 0.5V) Operating Junction Temperature Range (die).....-40C to +150C TH CC TTL Output Current (LOS, LOS) .........................................9mA Die Attach Temperature...................................................+400C PECL Output Current (OUT+, OUT-, SD) .........................50mA Storage Temperature Range .............................-50C to +150C Differential Voltage Between CZP and CZN..........-1.5V to +1.5V Lead Temperature (soldering, 10s) .................................+300C Differential Voltage Between IN+ and IN- .............-1.5V to +1.5V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +2.97V to +5.5V, PECL outputs terminated with 50 to V - 2V, R1 = 100k, T = -40C to +85C, unless otherwise noted. CC CC A Typical values are at V = +3.3V, T = +25C.) (Note 1) CC A PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Current PECL outputs open 22 45 mA LOS Hysteresis Input = 4.0mV (Note 2) 3.0 5 8.0 dB P-P Squelch Input Current 27 100 A PECL Output-Voltage High (Note 3) -1085 -880 mV PECL Output-Voltage Low (Note 3) -1830 -1550 mV Input = 7mV or 90mV , 0C to +85C -3.0 +3.0 dB P-P P-P LOS Assert Accuracy Input = 7mV or 90mV , -40C to +85C -3.6 +3.6 dB P-P P-P Minimum LOS Assert Input 2.7 mV P-P Maximum LOS Deassert Input 143 mV P-P Input Sensitivity (Note 4) 1 4 mV P-P Input Overload (Note 4) 1500 mV P-P TTL Output High R = 4.7k to 10k 2.4 3.0 V LOS TTL Output Leakage (Note 5) 1 20 A TTL Output Low I = 800A 0.2 0.5 V OL Data Output Transition Time 20% to 80%, Input > 4mV (Note 4) 0.35 0.8 1.20 ns P-P Pulse-Width Distortion Input > 4mV (Notes 4, 6) 50 250 ps P-P LOS, SD Assert/Deassert Time C = 0.01F 10 s FILTER Note 1: Dice are tested and guaranteed only at T = +25C. A Note 2: LOS hysteresis = 20log(V / V ). LOS-DEASSERT LOS-ASSERT Note 3: Relative to supply voltage (V ). CCO Note 4: AC characteristics are guaranteed by design and characterization. Note 5: Input < LOS threshold (LOS = HIGH), V = 2.4V. LOS Note 6: Pulse-width distortion = (width of wider pulse) - (width of narrower pulse) / 2, measured with 100Mbps 1-0 pattern. 2 MAX3969