LTC6268/LTC6269 - analog.com

1 LTC6268/LTC6269162689fFor more information APPLICATION FEATURESDESCRIPTION500 MHz Ultra-Low Bias Current FET Input Op AmpThe LT C 6268/LTC6269 is a single/dual 500 MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance sensor amplifiers. Its low distortion makes the LTC6268/LTC6269 an ideal amplifier for driving SAR operates on to supply and consumes per amplifier. A shutdown feature can be used to lower power consumption when the amplifier is not in use. The LTC6268 single op amp is available in 8-lead SOIC and 6-lead SOT-23 packages. The SOIC package includes two unconnected pins which can be used to create an input pin guard ring to protect against board leakage currents.

2 The LTC6269 dual op amp is available in 8-lead MSOP with exposed pad and 3mm 3mm 10-lead DFN packages. They are fully specified over the 40 C to 85 C and the 40 C to 125 C temperature TIA Frequency Response20k Gain 65 MHz Trans-Impedance AmplifierAPPLICATIONSn Gain Bandwidth Product: 500 MHzn 3dB Bandwidth (A = 1): 350 MHzn Low Input Bias Current: 3fA Typ. Room Temperature 4pA Max at 125 Cn Current Noise (100kHz): Hzn Voltage Noise (1 MHz): Hzn Extremely Low CIN 450fFn Rail-to-Rail Outputn Slew Rate: 400V/ sn Supply Range: to Quiescent Current: Harmonic Distortion (2VP-P): 100dB at 1 MHz 80dB at 10 MHzn Operating Temp Range: 40 C to 125 Cn Single in 8-Lead SO-8, 6-Lead TSOT-23 Packagesn Dual in 8-Lead MS8, 3mm 3 mm 10-Lead DFN 10 Packagesn Trans-Impedance Amplifiersn ADC Driversn CCD Output Buffern Photomultiplier Tube Post-Amplifiern Low IBIAS CircuitsL, LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective owners. + LTC62686268 FEEDBACK = IPD 20kBW = 65 MHzPD = OSI OPTOELECTRONICS, FCI-125G-006*TWO 0603 PACKAGE RESISTORS IN PARALLEL20k *IPDFREQUENCY (MHz) (dB ) TA02 LTC6268/LTC6269262689fFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSS upply Voltage V+ to V .. Voltage ..V to V+ + Current (+IN, IN)(Note 2) .. 1mAInput Current (SHDN) .. 1mAOutput Current (IOUT) (Note 8, 9) ..135mA Output Short-Circuit Duration (Note 3) .. Thermally LimitedOperating Temper atur e Range LTC6268I/ LTC6269I .. 40 C to 85 C LTC6268H/ LTC6269H .. 40 C to 125 C(Note 1)12348765 TOP VIEWSHDNV+OUTV NC IN+INNCS8 PACKAGE8-LEAD PLASTIC SO TJMAX = 150 C, JA = 120 C/W (NOTE 5)123654 TOP VIEWS6 PACKAGE6-LEAD PLASTIC TSOT-23V+SHDN INOUTV +INTJMAX = 150 C, JA = 192 C/W (NOTE 5)1234 OUTA INA+INAV 8765V+OUTB INB+INBTOP VIEWMS8E PACKAGE8-LEAD PLASTIC MSOP9V TJMAX = 150 C, JA = 40 C/W (NOTE 5)EXPOSED PAD (PIN 9) IS V , IT IS RECOMMENDED TO SOLDER TO PCBTOP VIEWDD PACKAGE10-LEAD (3mm 3mm) PLASTIC DFN10967845321V+OUTB INB+INBSDBOUTA INA+INAV SDA11V TJMAX = 150 C, JA = 43 C/W (NOTE 5)EXPOSED PAD (PIN 11) IS V , IT IS RECOMMENDED TO SOLDER TO PCBS pecified Temper atur e Range (Note 4) LTC6268I/ LTC6269I.

4 40 C to 85 C LTC6268H/ LTC6269H .. 40 C to 125 CMaximum Junction Temper atur e ..150 CStorage Temper atur e Range .. 65 C to 150 CLead Temper atur e (Soldering, 10 sec) ..300 CLTC6268/LTC6269362689fFor more information INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONSPECIFIED TEMPERATURE RANGELTC6268IS6#TRMPBFLTC6268IS6#TRPBFLT GFS6-Lead Plastic TSOT-23 40 C to 85 CLTC6268HS6#TRMPBFLTC6268HS6#TRPBFLTGFS6 -Lead Plastic TSOT-23 40 C to 125 CLTC6268IS8#PBFLTC6268IS8#TRPBF62688-Lea d Plastic SOIC 40 C to 85 CLTC6268HS8#PBFLTC6268HS8#TRPBF62688-Lea d Plastic SOIC 40 C to 125 CLTC6269 IMS8E#PBFLTC6269 IMS8E#TRPBFLTGFP8-Lead Plastic MSOP 40 C to 85 CLTC6269 HMS8E#PBFLTC6269 HMS8E#TRPBFLTGFP8-Lead Plastic MSOP 40 C to 125 CLTC6269 IDD#PBFLTC6269 IDD#TRPBFLGFN10-Lead Plastic DD 40 C to 85 CLTC6269 HDD#PBFLTC6269 HDD#TRPBFLGFN10-Lead Plastic DD 40 C to 125 CConsult LT C Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Offset VoltageVCM = l mVVCM = l mVTC VOSI nput Offset Voltage DriftVCM = V/ CIBI nput Bias Current (Notes 6, 8)VCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 20 900 4 320 900 4fA fA pAVCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 20 900 4 320 900 4fA fA pAIOSI nput Offset Current (Notes 6, 8)VCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 40 450 2 640 450 2fA fA pAenInput Voltage Noise Density, VCM = f = 1 MHz HzInput Voltage Noise Density, VCM = = 1 MHz HzInput Referred Noise Voltagef = to 10Hz13 VP-PinInput Current Noise Density, VCM = = HzInput Current Noise Density, VCM = = HzRINI nput ResistanceDifferential >1000G Common Mode>1000G CINI nput CapacitanceDifferential (DC to 200 MHz)100fFCommon Mode (DC to 100 MHz)450fFCMRRC ommon Mode Rejection RatioVCM = to (PNP Side)

6 L72 7090 dB dBVCM = 0V to l64 5282 dB dBIVRI nput Voltage RangeGuaranteed by The l denotes specifications that apply over the full operating temp erature range, otherwise specifications are at TA = 25 C, VSUPPLY = (V+ = 5V, V = 0V, VCM = mid-supply), RL = 1k , CL = 10pF, VSHDN is ELECTRICAL CHARACTERISTICSLTC6268/LTC6269462689fFor more information The l denotes specifications that apply over the full operating temp erature range, otherwise specifications are at TA = 25 C, VSUPPLY = (V+ = 5V, V = 0V, VCM = mid-supply), RL = 1k , CL = 10pF, VSHDN is Supply Rejection RatioVCM = , VSUPPLY Ranges from to l78 7595dB dBSupply Voltage Loop Voltage GainVOUT = to = 10k l125 40250V/mV V/mVRLOAD = 100 l10 221V/mV V/mVVOLO utput Swing Low (Input Overdrive 30mV) Measured from V ISINK = 10mA l80140 200mV mVISINK = 25mA l130200 260mV mVVOHO utput Swing High (Input Overdrive 30mV)Measured from V+ISOURCE = 10mA l70140 200mV mVISOURCE = 25mA l160270 370mV mVISCO utput Short Circuit Current(Note 9) l60 4090mA mAISS upply Current Per Amplifier l15 23mA mASupply Current in Shutdown (Per Amplifier) mAISHDNS hutdown Pin Current VSHDN = VSHDN = l 12 122 212 12 A AVILSHDN Input Low Input High VoltageEnable.

7 If SHDN is Unconnected, Amp is On Time, Delay from SHDN Toggle to Output Reaching 90% of TargetSHDN Toggle from 0V to 2V, AV = 1580nstOFFTurn Off Time, Delay from SHDN Toggle to Output High ZSHDN Toggle from 2V to 0V, AV = 1480nsBW 3dB Closed Loop BandwidthAV = 1350 MHzGBWGain-Bandwidth Productf = 10 MHz400500 MHztSSettling Time, 1V to 4V, Unity +Slew Rate+AV = 6 (RF = 499, RG = 100) VOUT = to , Measured 20% to 80%, CLOAD = 10pF l 300 200 400 V/ s V/ sSR Slew Rate AV = 6 (RF = 499, RG = 100) VOUT = to , Measured 80% to 20%, CLOAD = 10pF l 180 130 260 V/ s V/ sFPBWFull Power Bandwidth (Note 7)4VP-P 21 MHzHDHarmonic Distortion(HD2/HD3)A = 1, 10 MHz. 2VP-P, VCM = , RL = 1k 81/ 90dBTHD+NTotal Harmonic Distortion and NoiseA = 1, 10 MHz. 2VP-P, VCM = , RL = 1k dBILEAKO utput Leakage Current in ShutdownVSHDN = 0V, VOUT = 0V VSHDN = 0V, VOUT = 5V400 400nA ELECTRICAL CHARACTERISTICSLTC6268/LTC6269562689fFor more information ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temp erature range, otherwise specifications are at TA = 25 C, VSUPPLY = (V+ = , V = 0V, VCM = mid-supply), RL = 1k , CL = 10pF, VSHDN is PARAMETERCONDITIONSMINTYPMAXUNITSVOSI nput Offset VoltageVCM = l mVVCM = l mVTC VOSI nput Offset Voltage DriftVCM = V/CIBI nput Bias Current (Notes 6, 8)

8 VCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 20 900 4 320 900 4fA fA pAVCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 20 900 4 320 900 4fA fA pAIOSI nput Offset Current (Notes 6, 8)VCM = LTC6268I/LTC6269I LTC6268H/LTC6269H l l 40 450 2 640 450 2fA fA pAenInput Voltage Noise Density, VCM = f = HzInput Voltage Noise Density, VCM = f = HzInput Referred Noise Voltagef = to 10Hz13 VP-PinInput Current Noise Density, VCM = f = HzInput Current Noise Density, VCM = f = HzRINI nput ResistanceDifferential Common Mode>1000 >1000G G CINI nput CapacitanceDifferential (DC to 200 MHz) Common Mode (DC to 100 MHz)100 450 fF fFCMRRC ommon Mode Rejection RatioVCM = to (PNP Side) l63 60100dB dBVCM = 0V to (Full Range) l60 5077dB dBIVRI nput Voltage RangeGuaranteed by Loop Voltage GainVOUT = to = 10k l80 40200V/mV V/mVRLOAD = 100 l10 218V/mV V/mVVOLO utput Swing Low (Input Overdrive 30mV).

9 Measured from V ISINK = 10mA l80140 200mV mVISINK = 25mA l140200 260mV mVVOHO utput Swing High (Input Overdrive 30mV). Measured from V+ISOURCE = 10mA l80140 200mV mVISOURCE = 25mA l170270 370mV mVISCO utput Short Circuit Current(Note 9) l50 3580mA mAISS upply Current per Amplifier 23mA mALTC6268/LTC6269662689fFor more information PARAMETERCONDITIONSMINTYPMAXUNITSS upply Current in Shutdown (Per Amplifier) mAISHDNS hutdown Pin Current VSHDN = VSHDN = l 12 122 212 12 A AVILSHDN Input Low Input High VoltageEnable. If SHDN is Unconnected, Amp Is On Time, Delay from SHDN Toggle to Output Reaching 90% of TargetSHDN Toggle from 0V to 2V710nstOFFTurn Off Time, Delay from SHDN Toggle to Output High ZSHDN Toggle from 2V to 0V620nsBW 3dB Closed Loop BandwidthAV = 1350 MHzGBWGain-Bandwidth Productf = 10 MHz370420 MHzSR+Slew Rate+AV = 6 (RF = 499, RG = 100), VOUT = to , Measured 20% to 80%, CLOAD = 10pF l 300 200 400 V/ s V/ sSR Slew Rate AV = 6 (RF = 499, RG = 100), VOUT = to , Measured 80% to 20%, CLOAD = 10pF l 180 130 260 V/ s V/ sFPBWFull Power Bandwidth (Note 7)2VP-P 40 MHzHDHarmonic Distortion(HD2/HD3)A = 1, 10 MHz.

10 1VP-P, VCM = , RL = 1k 81/ 90dBTHD+NTotal Harmonic Distortion and NoiseA = 1, 10 MHz. 1VP-P, VCM = , RL = 78% ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25 C, VSUPPLY = (V+ = , V = 0V, VCM = mid-supply) RL = 1k , CL = 10pF, VSHDN is 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The inputs are protected by two series connected ESD protection diodes to each power supply. The input current should be limited to less than 1mA. The input voltage should not exceed 200mV beyond the power 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted 4: The LTC6268I/LTC6269I is guaranteed to meet specified performance from 40 C to 85 C.