CXA1684M High-Speed Transimpedance Amplifier Description CXA1684M is a low noise transimpedance amplifier, particularly suitable for fiber-optic system. CXA1684M is fabricated using high-speed bipolar process. 8 pin SOP (Plastic) Features • High transimpedance: (Q) 3.9 kΩ (Typ.) (QB) 3.7 kΩ (Typ.) • Wide band width (–3dB): (Q) 630 MHz (Typ.) (QB) 390 MHz (Typ.) • Maximum input current: 1mA Applications • Q output SONET/SDH: 622 Mb/s Fiber channel: 532 Mb/s • Differential output SONET/SDH: 155 Mb/s Fiber channel: 133,266 Mb/s ESCON: 200 Mb/s Absolute Maximum Ratings • Supply voltage VCC–VEE –0.3 to +7.0 • Minimum input voltage VIN VEE • Input current IIN –1 to +1 • Output current 0 to 50 (Continuous) IO (Q/QB) (Surge) 0 to 100 • Storage temperature Tstg –65 to +150 V V mA mA mA °C Recommended Operating Conditions • DC power supply voltage VCC–VEE 4.75 to 5.46 V • Operating ambient temperature Ta 0 to +85 °C Structure Bipolar silicon monolithic IC Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. —1— E94X23A8Y CXA1684M Block Diagram and Pin Assignment VCC 5 4 VCC IN 6 3 QB C 7 2 Q 1 VEE Zt VEE 8 Electrical Characteristics • DC Electrical Characteristics Item Supply current Transimpedance Q QB Max. Input Current before clipping Max. Input Current Input voltage Q Output voltage QB Input capacitance (VCC=GND, VEE=–5.46 to –4.75V, Ta=0 to +85°C) Symbol Test Condition Min. Typ. IEE ZTQ ZTQB IIN IIN2 VIN VOUTQ VOUTQB VC CIN input pin left open –15.1 2.3 1.9 +100 +1000 –11.2 3.9 3.7 Item Bandwidth Q (–3 dB) QB Input Current Noise Spectral Density (Mean value) Unit mA 5.6 5.4 kΩ µA VEE+2.5 VEE+1.9 VCC–2.6 VEE+1.7 2.0 input pin left open • AC Electrical Characteristics Max. V pF (VCC=GND, VEE=–5.46 to –4.75 V, Ta=0 to +85 °C) Symbol f–3 dBQ f–3 dBQB Test Condition In fN=1 kHz to 622 MHz ∗1 Min. 435 187 Typ. 630 390 4.0 Max. Unit MHz pA/√Hz ∗1 Assumes photodiode capacitance; CPD<1.0 pF, output load capacitance; Cout=2.0 pF, Q: 620 Ω to VEE, QB: 1.3k Ω to VEE —2— CXA1684M Application Circuit VCC PD VCC 5 0.1µF 4 IN QB 6 3 7 2 C 1.0µF 0.1µF QB Q Q Zt VEE VEE 8 1 VEE 1.3kΩ 620 Ω VEEO Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Cautions for Handling 1. As the electronic breakdown level is weak, take care to handle. 2. The internal resistor of the output pin does not have the capability of drive. The terminal resistors must be connected. The resistance value is shown in application circuit. —3— CXA1684M Typical Performance • Typical Frequency Characteristics Q: f–3dB=965MHz ATTEN 10dB RL –13.0dBm 5dB/ QB: f–3dB=440MHz MKR –24.25dBm 965MHz ATTEN 10dB RL –13.0dBm MKR 965MHz –24.25dBm 5 dB/ MKR –25.08dBm 440MHz MKR 440MHz –25.08dBm G G START 0Hz STOP 1.200GHz 1.0MHz VBW 1.0MHz RBW SWP 50ms CENTER 750MH z SPAN 1.500GHz RBW 1.0MHz VBW 1.0MHz SWP 50ms • Typical Output Waveforms IN=–30dBm, 310MHz QB = 20.00mVolts/div Ch.1 = 20.00mVolts/div Ch.2 Timebase = 1.00ns/div Ch.1 Parameters Rise Time = 941.4ps = 310.540MHz Freq. = 1.6036ns +Width Overshoot = 0.000% RMS Volts = 30.818mVolts Q 17.9200ns 22.9200ns 27.9200ns —4— Offset Offset Delay p-p Volts Fall Time Period -Width Preshoot Dutycycle = = = = = = = = = 0.000Volts 0.000Volts 17.9200ns 90.625mVolts 1.0630ns 3.2202ns 1.6166ns 0.000% 49.79% CXA1684M • Output Duty Cycle Distortion VS. Input Current 100 DCD (%) 75 50 25 0 0 200 400 600 lin (µA) 800 1000 • Test Circuit TEST BOARD VCC Signal Generator Spectrum Analyzer/ Digitizing Oscilloscope 1µF Iin= Vin 100 Ω Vin ATT 5 100 Ω -26dB Vin 6 1µ 1µ 51 Ω 1p 4 7 8 1.3 Ω 2p 1µ 51Ω VQB 1µ 51Ω VQ 50 Ω 3 CXA1684M 2 1 Tracking Generator —5— 620 Ω 2p 50 Ω CXA1684M Unit : mm 8PIN SOP (PLASTIC) + 0.4 1.25 – 0.15 + 0.4 5.0 – 0.1 8 0.10 5 6.4 ± 0.4 + 0.3 4.4 – 0.1 A 4 1 1.27 b 0.24 M + 0.15 0.1 – 0.1 0.5 ± 0.2 B (0.4) DETAIL B : SOLDER b = 0.4 ± 0.03 + 0.03 0.15 – 0.01 0° to 10° + 0.1 b = 0.4 – 0.05 (0.15) + 0.1 0.15 – 0.05 Package Outline DETAILA DETAIL B : PALLADIUM PACKAGE STRUCTURE SONY CODE SOP-8P-L03 EIAJ CODE SOP008-P-0225 JEDEC CODE PACKAGE MATERIAL EPOXY RESIN LEAD TREATMENT SOLDER/PALLADIUM PLATING LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —6—