CXB1548Q-Y Laser Driver Description The CXB1548Q-Y is a high-speed monolithic Laser Driver/Current Switch with ECL input level. Open collector outputs are provided at the output pins (Q, Q) and have the capability of driving modulation current of 60mApp at a max. data rate of 2.0Gbps (NRZ). DRIVADJ and SDRIV inputs control the modulation current amplitude, and BIASADJ, SBIAS inputs control the bias current. Modulation and bias current can be controlled by either voltage or current through these pins. This device includes three Operational Amplifiers and Laser Shutdown function. 32 pin QFP (Ceramic) Features • Maximum data rate (NRZ): 2.0Gbps (Typ.) • Differential Data input: ECL • On chip three Operational Amplifiers • Laser Shutdown Input: TTL Applications • SONET/SDH: 155,622Mb/s,1.2Gb/s • Fiber channel: 133,266,532Mb/s,1.062Gb/s • FDDI: 125Mb/s ESCON: 200Mb/s HDTV: 1.5Gb/s Absolute Maximum Ratings • Supply voltage • Input voltage • Differential input voltage • Output current (Continuous) Input current (Continuous) Vcc – VEE VIN |VIN – VIN| IQ, IBIAS IDRVADJ IBIASADJ Tstg –0.3 to +7.0 VEE to +0.5 0 to 2.5 0 to 80 0 to 8 0 to 8 –65 to +150 V V V mA mA mA °C Recommended Operating Conditions • DC power supply voltage Vcc – VEE • Operating case temperature Tc 4.75 to 5.46 0 to +85 V °C • Storage temperature 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– E94721-PK CXB1548Q-Y VEE1 25 VREF 20 IN2 21 OUT3 22 IN2 23 IN3 24 IN3 VCC2 LDOFF Block Diagram and Pin Assignment 19 18 17 16 OUT2 VOLTAGE SOURCE (VBB) VOLTAGE SOURCE (VREF) VBB 26 15 IN1 D 27 14 IN1 D 28 13 IGND INPUT SIGNAL MONITOR VCC1 29 12 OUT1 11 BIASADJ P 30 MODULATION GENERATOR P 31 BIAS GENERATOR 10 VEE2 9 VEE2 Q Q 5 6 7 8 BIASA 4 BIASB 3 Q 2 Q 1 SDRIV DRIVADJ 32 Truth table LDOFF D Q P H L H H H H L L L L H H L H H L ∗ In a case of resistor load –2– SBIAS CXB1548Q-Y Pin Description Pin No. 1 32 2, 10 Symbol Typical Voltage (V) DC SDRIV 0mA to 8mA∗1 0mA to 6mA∗2 Equivalent circuit Description AC — — DRIVADJ VEE to VEE +2.5V — VEE2 –5.2V — — 0mA to 60mA∗1 0mA to 40mA∗2 4 3 5 Modulation generator current monitor. 6 VCC Modulation generator current adjustment. Negative power supply pin. 1 3 Q 4 32 VEE 2 5 Q — 6 7 0mA to 60mA∗1 0mA to 40mA∗2 10 0mA to 30mA 8 BIASA 9 SBIAS 8 7 BIASB Modulation generator current output. Bias generator current output. — VCC 0mA to 8mA 9 — Bias generator current monitor. 11 11 BIASADJ 12 OUT1 14 IN1 15 IN1 16 OUT2 18 IN2 19 IN2 20 OUT3 21 IN3 22 IN3 13 IGND VEE to VEE +2.5V — VEE 2 Bias generator current adjustment. 10 Output pin for OpAmp. Input pins for OpAmp. 15 19 22 VEE +0.7V to –1.0V IN IN — OUT Output pin for OpAmp. 12 16 20 14 18 21 Input pins for OpAmp. 13 Output pin for OpAmp. Input pins for OpAmp. open or VEE ∗1 VEE = –5.46V to –4.94V ∗2 VEE = –4.94V to –4.75V OpAmp switch pin IGND = VEE: active IGND = OPEN: inactive — –3– CXB1548Q-Y Pin No. Symbol Typical Voltage (V) DC Equivalent circuit Description AC VCC 17 VREF VEE +2.5V VREF GEN — 17 Reference voltage (VREF – VEE: 2.5V) Max. drive current ±3mA VEE open or VEE. — Shut down switch pin LDOFF = L (VEE): shut down LDOFF = H (open): Laser active VCC2 0V — Positive Power supply pin. VEE1 –5.2V — Negative Power supply pin. 23 LDOFF 24 25 VCC 900Ω 26 VBB –1.3V — Reference voltage (–1.3V) Use for the reference voltage in the case of single-phase input. Max. drive current ±200µA 26 500µ VEE 25 VEE1 –5.2V — VCC 29 27 D 200Ω — 28 –1.84V to –0.81V 27 200Ω Data signal input. 28 D VEE 25 29 Negative power supply pin. VCC1 0V Positive power supply pin. — –4– CXB1548Q-Y Pin No. Symbol Typical Voltage (V) DC Equivalent circuit 30 30 P Description AC 31 — 200Ω 200Ω Input signal monitor output. 0mA to 2.7mA 31 P — 1.7mA VEE –5– CXB1548Q-Y Electrical Characteristics • DC Electrical Characteristics Laser Driver part Item Power supply current (VCC1 = VCC2 = GND, VEE1 = VEE2 = –5.46 to –4.75V, Tc = 0 to +85°C) Symbol IEE Condition Min. Typ. Max. Unit IQ = 0mA, IBIAS = 0mA –99 –69 — IQ = 60mA, IBIAS = 60mA –240 –203 — VEE = –5.46 to –4.94V 60 — — VEE = –4.94 to –4.75V 40 — — –2.5 — +2.0 V 60 — — mA mA Max. Modulation current IQ Modulation output voltage range VQ Tc = 25°C Max. Bias current IBIAS IBIASA + IBIASB Bias output voltage range VBIAS –2.7 — 0 Modulation current monitor output voltage range VSQ –2.7 — 0 Bias current monitor output voltage range VSBIAS –2.7 — 0 Input signal monitor current IP 1 1.7 2.7 Input signal monitor output voltage range VP –2.5 — +2.0 ECL input High voltage VEDH –1.17 — –0.81 ECL input Low voltage VEDL –1.84 — –1.48 ECL input High current IEDH — — 20 TTL input High voltage VTDH VEE + 2.0 — Vcc TTL input Low voltage VTDL VEE – 0.5 — VEE + 0.8 TTL input High current ITDH — — 10 TTL input Low current ITDL –320 — — Reference bias voltage for OP Amp. VREF 2.25 2.5 2.75 Reference bias voltage VBB –1.38 –1.32 –1.26 Min. Typ. Max. Tc = 25°C VREF – VEE V mA V µA V µA V Ratio of current setup Item Symbol Condition Modulation current vs. Modulation monitor current S1 at voltage control application 9.0 11.4 12.0 Modulation current vs. Modulation control current S2 at current control application 6.5 8.6 10.5 Bias current vs. Bias monitor current S3 at voltage control application 11.0 12.0 13.0 Bias current vs. Bias control current S4 at current control application 7.4 9.8 12.0 • AC Electrical Characteristics Laser Driver part (VCC1 = VCC2 = GND, VEE1 = VEE2 = –5.46 to –4.75V, Tc = 0 to +85°C, RI = 25Ω to GND) Item Symbol Max. Data rate fDMAX Shut Down Time TSHUT Rise time TTLH Fall time TTHL Condition NRZ 20 to 80% IQ = 60mA, IBIAS = 0 –6– Min. Typ. Max. Unit 1.6 2.0 — Gbps — — 30 µs — 170 — — 150 — ps CXB1548Q-Y • AC & DC Electrical Characteristics Operational Amplifier part Item (VCC2 = GND, VEE1 = IGND = –5.46 to –4.75V, Tc = 0 to +85°C) Symbol Condition Min. Typ. Max. Unit Power supply current IEE — –9.0 — mA Input offset voltage Voff — 1.0 — mV Input bias current Ib — –1.0 — µA Input offset current Ioff — 200 — nA Input voltage range Vin VEE + 0.7 — –1.0 V Open Loop Gain Av — 40 — dB Output voltage range Vo VEE + 0.7 — –1.0 V Input Impedance Zin 1.0 — — MΩ Slew Rate SR — 18 — V/µs Unity Gain Band width funit 30 — — MHz Output drive current range Io –3.0 — 3.0 mA Application Circuit Current Control Application VSHUT VEE1 25 VEE = –5.2V 0.01µF VBB 26 IN3 OUT3 IN2 IN2 VREF 23 24 0.01µF IN3 VCC2 LDOFF TTL Level Single Input L : Shut down Open High 22 21 20 19 18 17 VOLTAGE SOURCE (VBB) 16 OUT2 VOLTAGE SOURCE (VREF) 15 IN1 D 27 ECL Level Single Input D VIN 14 IN1 28 IGND = VEE 13 IGND Op Amp Active INPUT SIGNAL MONITOR VCC1 29 P 200Ω P 12 OUT1 11 30 MODULATION GENERATOR 31 VEE = –5.2V BIAS GENERATOR 10 IP DRIVADJ 9 32 IBIAS : IBIASADJ ≈ 10 : 1 0.1µH IBIAS IQ IQ : IDRVADJ ≈ 9 : 1 VEE = –5.2V Laser Diode –7– BIASB Q Q Q 5.1Ω IDRIVADJ SBIAS IBIASADJ 8 7 VEE2 BIASA 6 5 4 3 VEE2 SDRIV 2 Q 1 BIASADJ CXB1548Q-Y Measurement Circuit (DC) VEE1 VEE = –5.2V 0.01µF 25 OUT3 IN2 IN2 VREF 23 24 IN3 0.01µF IN3 VCC2 LDOFF VSHUT 22 21 20 19 18 17 VOLTAGE SOURCE (VBB) VBB 16 OUT2 VOLTAGE SOURCE (VREF) 26 15 IN1 27 14 IN1 D 28 VIN 13 IGND D VCC1 200Ω P INPUT SIGNAL MONITOR 29 12 OUT1 11 30 BIAS GENERATOR MODULATION GENERATOR 31 10 P 9 32 VEE = –5.2V SBIAS 8 BIASB 7 Q VEE2 BIASA 6 5 4 3 VEE2 SDRIV 2 Q 1 Q DRIVADJ Q IP BIASADJ IBIASDJ A IQ A IQB IDRVADJ A IBIAS VEE = –5.2V VEE1 VEE = –5.2V 0.01µF 25 VBB IN3 OUT3 IN2 IN2 VREF 23 24 IN3 VCC2 0.01µF LDOFF VSHUT 22 21 20 19 18 17 VOLTAGE SOURCE (VBB) 16 OUT2 VOLTAGE SOURCE (VREF) 26 15 IN1 27 14 IN1 D 28 VIN 13 IGND D VCC1 200Ω P INPUT SIGNAL MONITOR 29 12 OUT1 11 30 MODULATION GENERATOR 31 BIAS GENERATOR 10 P IP DRIVADJ 9 32 BIASADJ 510Ω VEE2 VEE = –5.2V VBIAS SBIAS 510Ω BIASB BIASA 8 7 Q Q VEE2 6 5 4 3 Q 2 Q 1 SDRIV VMOD A A IQB IQM A VEE = –5.2V –8– A IQ A IBIAS IBM CXB1548Q-Y Measurement Circuit (AC) VEE = –5.2V VEE1 25 0.01µF VBB IN2 IN2 VREF 23 OUT3 24 IN3 0.01µF IN3 VCC2 LDOFF VSHUT 22 21 20 19 18 17 16 OUT2 VOLTAGE SOURCE (VBB) VOLTAGE SOURCE (VREF) 26 15 IN1 27 14 IN1 28 13 IGND D VIN D BIAS GENERATOR 10 9 32 51Ω BIASADJ VEE2 SBIAS VEE = –5.2V –5.2V 8 7 BIASA 6 5 4 3 BIASB 2 Q 1 Q DRIVADJ MODULATION GENERATOR 31 Q P 11 Q IP P 12 OUT1 30 VEE2 200Ω 29 SDRIV VCC1 INPUT SIGNAL MONITOR 51Ω IDRVADJ VEE = –5.2V Digitizing oscilloscope Q Monitor Coaxial cable QB Monitor 50Ω –9– 50Ω CXB1548Q-Y Voltage Control Application VEE1 25 VEE = –5.2V 0.01µF VBB 26 IN3 OUT3 IN2 IN2 VREF 21 20 19 18 17 VOLTAGE SOURCE (VBB) 16 OUT2 VOLTAGE SOURCE (VREF) 15 IN1 D 27 14 IN1 D 28 13 IGND INPUT SIGNAL MONITOR 29 P 200Ω P VEE = –5.2V IP IGND = VEE OP Amp Active VCC1 12 OUT1 VBIASADJ BIASADJ 11 30 BIAS GENERATOR MODULATION GENERATOR 31 10 9 32 DRIVADJ 510Ω BIASB Q SBIAS VEE = –5.2V A 8 7 510Ω VEE2 BIASA 6 5 4 3 Q SDRIV 2 Q 1 Q VDRIVADJ 22 VEE2 ECL Level Single Input VIN 23 24 0.01µF TTL Level Single Input L: Shut down Open High IN3 VCC2 LDOFF VSHUT IBIASMONITOR IQMONITOR 5.1W A IBIAS IQ IQ : IQMONITOR ≈ 11 : 1 VEE = –5.2V IBIAS : IBIASMONITOR ≈ 12 : 1 0.1µH Laser Diode Cautions for Handling 1. The outputs (Q, Q, BIASA, BIASB, SDRIV, SBIAS, P and P) on this IC are the open collector type. Therefore, when these pins are not bing used, connect them to Vcc. 2. When the inputs (DRIVEADJ and BIASADJ) are not bing used, connect them to VEE. 3. Do not apply voltage over VEE + 2.5V to DRIVADJ pin and BIASADJ pin. 4. In voltage control Application, do not apply voltage over the output voltage range to SDRIV pin and SBIAS pin. (see DC Characteristics of Laser Part and Voltage Control Application Circuit.) 5. Maximum drive current of VBB pin is ±200µA. 6. Maximum input differential voltage is 2.5V. ( | D– D | ) 7. Maximum drive current of VREF pin is ±3mA. 8. As the electronic breakdown level is weak, take care to handle. – 10 – CXB1548Q-Y Example of Representative Characteristics Bias current vs. Bias control current Modulation current vs. Modulation control current 100 80 IBIAS – Bias current [mA] IQ – Modulation current [mA] 100 60 40 20 0 0 2 4 6 8 80 60 40 20 0 10 0 4 6 8 10 Bias current vs. Bias control voltage Modulation current vs. Modulation control voltage 100 100 80 80 IBIAS – Bias current [mA] IQ – Modulation current [mA] 2 IBIASADJ – Bias control current [mA] IBIAS : IBIASADJ ≈ 10 : 1 IDRIVADJ – Modulation control current [mA] IQ : IDRIVADJ ≈ 9 : 1 60 40 20 0 60 40 20 0 0 0.5 1 1.5 2 0 VDRVADJ – Modulation control voltage [V] IQ ≈ 0.1 × ( Vmod – 0.8 ) [A] 0.5 1 1.5 VBIAS – Bias control voltage [V] IBIAS ≈ 0.11 × ( VBIAS – 0.8 ) [A] – 11 – 2 CXB1548Q-Y Package Outline Unit: mm 32PIN QFP (CERAMIC) 14.73 ± 0.3 4.92 MAX 0.15 ± 0 .05 17 24 16 32 9 10.63 MAX 25 1 0.76 0.48 ± 0.1 0° to 10° PACKAGE STRUCTURE PACKAGE MATERIAL CERAMIC SONY CODE QFP-32C-L01 LEAD TREATMENT TIN PLATING EIAJ CODE XQFP023-G-0000-A LEAD MATERIAL 42 ALLOY PACKAGE WEIGHT 0.3g JEDEC CODE – 12 – (0.825) 1.016 0.635 ± 0.125 8