LFI55A/355A/155/355 Nt ] \D LF1I56A/356A/156/356 FECHNOLOGY JFET-Input Operational Amplifiers FEATURES = Guaranteed Offset Voltage Drift on All Grades = Guaranteed Slew Rate on All Grades = Guaranteed Low Input Offset Current Guaranteed Low Input Bias Current 50pA Max. Guaranteed High Slew Rate (156A/356A) 10V/ys Min. = Fast Settling to 0.01% 1.5ys APPLICATIONS Output Amplifiers for D/A Converters Fast Sample and Hold Circuits High Speed integrators Photocell Amplifiers # High Input Impedance Buffers 10pA Max. Low Supply Current (LF155) High-Speed (LF156) DESCRIPTION Linear Technologys LF155/156 series features several improvements compared to similar types from other man- ufacturers: offset voltage drift with temperature and slew rate are guaranteed on all grades, not just on the more expensive A grades. Other specifications such as volt- age gain and high temperature bias and offset currents are also improved. The industry standard LF155/156 devices exhibit phase reversal at the output when the negative common-mode limit at the input is exceeded (i.e., from 12V to 15V with +15V supplies). This can cause lock-up in servo systems. As shown below, Linear Technology's LF155/ 156 does not have this problem due to unique phase reversal protection circuitry. For applications requiring higher per- formance, see the LT1055 and LT1056 data sheets. Voltage Follower with Input Exceeding the Negative Common-Mode Range INPUT + 15V SINE WAVE OUTPUT STANDARD 185/156 10V/DIV INPUT 10V/DIV 0.5ms/DIV OUTPUT LINEAR TECH 155/156 10V/0IV LY WAR 2-271LFIS5S5A/355A/155/355 LFI56A/356A/156/356 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION Supply Voltage ORDER PART NUMBER LF155A/155/355A, TOP VIEW LF156A/156/356A ................... + 22V LF355/356 0... eee + 18V Differential Input Voltage LF155A/155/156A/156............0.. + 40V try aH TET eeaH LF355A/355/356A/356............... +30V LF355H LF356H Input Voltage (Note 1) LF355AH LF356AH LF155A/155/156A/156............... + 20V LF355A/355/356A/356............ 00. + 16V METAL CAN Output Short Circuit Duration............. indefinite Operating Temperature Range LF155A/155/156A/156....... 55C to 125C Top VIEW LF355A/355/356A/356........... 0C to 70C L[F355N8 LF356N8 Maximum Junction Temperature LF355AN8 LF356AN8 LF155A/155/156A/156............... 150C LF355A/355/356A/356................ 100C Storage Temperature Range Vos is adjusted with a 20k or 50k AllDevices .............0000, 65C to 150C BIN PLASTIC potentiometer between the balance Lead Temperature (Soldering, 10sec.)........ 300C terminals. The wiper is tied to V ELECTRICAL CHARACTERISTICS (note 2) LF155A/156A SYMBOL | PARAMETER CONDITIONS LF355A/356A LFIS5/156 LF355/356 UNITS MIN. TYP MAX | MIN TYP MAX | MIN TYP MAX Vos input Offset Ty = 25C 1 2 2 35 30 8 Voltage Over Temperature 2.5 355A/356A 2.3 AVo5 Average TC of Rs =502 3 5 5 ) AT input Offset Voltage Change in Ro = 500 (Note 4) 0.5 0.5 0.5 Average TC with Vos Adjust los Input Offset Tj=25C (Note 3} pA Current Tj=126C nA T= 70C nA Ip Input Bias Tj; =25C (Note 3) pA Current T= 125C nA T<70C nA Rin Input T= 25C 2 Resistance AvoL Large Signal Vg = +15V, Ta = 25C, y 200 50 200 40 200 V/mV Voltage Vo = + 10V, Ry = 2k aa ee Gain Over Temperature 30 25 25 V/mvV 2-272 LI WHALFI55A/355A/155/355 LFI56A/356A/156/356 ELECTRICAL CHARACTERISTICS (note 2) LF155A/ 156A LF155/156 LF355/356 SYMBOL | PARAMETER CONDITIONS LF355A/356A UNITS MIN TYP MAX} MIN TYP MAX] MIN TYP MAX Vo Output Vg= + 15V,R,=10k |e@| #12 +13 412 +13 #12 +13 V Voltage Vg = + 15V, Ry =2k @; 4210 +12 +10 +12 +10 +12 V Swing Vom Input Common-Mode | Vo= +15V @| 211 +151 #11 +15.1 +10 +15.1 V Voltage Range 12 -12 12 CMRR Common-Mode e 85 100 85 100 80 100 dB Rejection Ratio PSRR Supply Voltage Vs=2410Vto+18V |e) 85 100 85 100 - _ dB Rejection Ratio | Vs=+10Vto+15V je - 80 100 dB Is Supply Current Ta = 25C, Vg = + 15V LF155/355 Series LF156/356 Series LF356A SR Slew Rate Ay=+1 Ty = 25C, Vo= + 15V LF155/355 Series LF156/356 Series GBW Gain Bandwidth | Ty=25C, Vg= + 15V Product LF155/355 Series - 2.5 2.5 2.5 MHz LF156/356 Series 4 5 5 5 MHz ts Settling Time Ty = 25C, Vo= + 15V to 0.01% LF155 Series (Note 5) 4 4 4 Bs LF156 Series 1.5 1.5 1.5 us Gn Input Noise Ty = 25C, Vg = + 15V Voltage f= 100Hz Density LF155 Series 25 25 25 nv/VHz LF156 Series 15 15 15 nv/VHz f=1000Hz LF155 Series 20 20 20 nv/VHz LF156 Series 12 12 12 nv/VHz in input Noise Ta = 25C, Vg = + 15V Current f=100Hz 0.01 0.01 0.01 pa/VHz Density f= 1000Hz 0.01 0.01 0.01 pA/VHz Cin Input e 3 3 3 pF Capacitance The @ denotes the specifications which apply over the full operating temperature range. The shaded electrical specifications indicate those parameters which have been improved or guaranteed test limits provided for the first time. For MIL-STD components, please refer to LTC 883C data sheet for test listing and parameters. Note 1: Unless otherwise specified, the absolute maximum negative input voltage is equal to the negative power supply voltage. Note 2: Unless otherwise stated, these test conditions apply: Note 3: The input bias currents are junction leakage currents which approximately double for every 10C increase in the junction temperature, T,. Due to limited production test time, the input bias cur- | x rents measured are correlated to junction temperature. In normal opera- tion the junction temperature rises above the ambient temperature as-a result of internal power dissipation, Pp. Tj =T,+ jp Pp where Oj, is the thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum. Note 4: The temperature coefficient of the adjusted input offset voltage Changes only a small amount (0.5zV/C typically) for each mV of adjust- LFI55A/156A LF155/156 LF355A/356A LF355/356 Supply Voltage. Vg | + 15V<Vg< + 20V +1SVeVo=418V } Vg= + 15V Th 55C sTas + 125C OC sTas+70C OC <Tas+70C ment from its original unadjusted value. Common-mode rejection and open loop voltage gain are also unaffected by offset adjustment. Note 5: Settling time is defined here for a unity gain inverter connection and Vog, Ig and Igg are measured at Vey =0. using 2kQ resistors. It is the time required for the error voltage (the voltage at the inverting input pin on the amplifier) to settle to within 0.01% of its final value from the time a 10V step input is applied to the inverter. wee 2-273LFI55A/355A/155/355 LFI56A/356A/156/356 TYPICAL PERFORMANCE CHARACTERISTICS Normalized Slew Rate vs Gain, Phase vs Frequency Inverter Settling Time Temperature 100 10 T= 25C Vg= + 15V LF155 TO sal Ta=25C | 645g 5 10 = 3 2 S 80 F 2 z GAIN LE = 2 < S 08 a 0 2 8 8 5 < = 3 20a s 5-5 0 5 Qo LF 20 10 0.1 0.3 1 3 10 30 100 0.1 1.0 10 -75 25 25 75 125 FREQUENCY {MHz} SETTLING TIME (us) TEMPERATURE (C) Supply Current vs LF156 Large Signal LF156 Smail Signal Temperature Response Response 8 2 6 = 3 z 2 3 S = a ray o 4 = FS z g a 2 0 a -7 25 25 75 425 Ay= +1, C, = 100pF, 1ys/DIV Ay= +1, C.=100pF, 0.24SEC/DIV TEMPERATURE (C) PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. H Package Metal Can N8 Package 8 Lead Plastic 0.355 0.370 (9.017 - 9.398) DIA 9.905-0.335 C11 0 oa (7. TAT 8509) 4 1 + t Mi (1.016) | 0.080 7 q oa aT Max | (1.270) 0.165 0.185 . , i ti wax (4.191 4699) 5 a -= Crtcy ty SEATING {_}i BAUBE 4 oq 4 780 | i PANE 2.70 19.05) Ng 0.040 say 8.060, 0.010 0.045 wt [] Hl Y {1.016} 1.524) 40.254 9.143) sa 4.616 - 0.021 0.370 0.400 (0.406.583) 0.020 (*~ ig 40g 10.16) | (0.508) 0.005 oe 5e J Mn 20 15 min asetye tO 0.027 0.045, 4 asst 15 o.027-000 4S (0.686 1.143) es A (0.686 0.864) 9370 4.445) 7 ; { GLASS 0.125-0.130 O.11S 0.145, th \ oS (2.921 3.683) cL {3.175 3.302) t ul u i 0.090 -0.060_ mal Leeoese 0.008 0.095, (0.762 1.524) (0.203 0.381) 100 | TYP TYP 0.100 ee) 0.014- 0.023 0.2900.310 (2540) TYP (0.356 0.584) (7.366 7.874) 0.120 - 0.160, Bsc* TP (3.0408 4.064) AAD TYP INSULATING STANOOFF LEADS WITHIN 0.007 OF TRUE POSITION (TP} AT GAUGE PLANE Tjmax Oia Sie : Tjmax Gia 150C 180C/W | 45C/W 400C 130C /W 2-274 LY Wie