LF351_08

LF351 Wide bandwidth single JFET operational amplifiers Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Internally adjustable input offset voltage Low power consumption Wide common-mode (up to VCC+) and differential voltage range Low input bias and offset current Output short-circuit protection High input impedance JFET input stage Internal frequency compensation Latch up free operation High slew rate 16 V/µs (typical) D SO-8 (Plastic micro package) N DIP8 (Plastic package) Description These circuits are high speed JFET input single operational amplifiers incorporating well matched, high voltage JFET and bipolar transistors in a monolithic integrated circuit. The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient. Pin connections (top view) 1 2 3 4 8 7 6 5 1 - Offset null 1 2 - Inverting input 3 - Non-inverting input 4 - VCC5 - Offset null 2 6 - Output 7 - VCC+ 8 - N.C. April 2008 Rev 2 1/14 www.st.com 14 Schematics LF351 1 Schematics Figure 1. Schematic diagram VCC Non-inverting input Inverting input 100W 200W Output 100W 30k 8.2k 1.3k VCC Offset Null1 35k 1.3k 35k 100W Offset Null2 Figure 2. Input offset voltage null circuit 2/14 LF351 Absolute maximum ratings and operating conditions 2 Table 1. Symbol VCC Vi Vid Rthja Absolute maximum ratings and operating conditions Absolute maximum ratings Parameter Supply voltage(1) Input voltage (2) (3) Value ±18 ±15 ±30 125 85 40 41 Infinite -65 to +150 500 200 1.5 Unit V V V °C/W Differential input voltage Thermal resistance junction to ambient(4) SO-8 DIP8 Thermal resistance junction to case(4) SO-8 DIP8 Output short-circuit duration(5) Rthjc °C/W Tstg Storage temperature range HBM: human body model(6) °C V V kV ESD MM: machine model (7) CDM: charged device model(8) 1. All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference level is the midpoint between VCC+ and VCC-. 2. The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less. 3. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. 4. Short-circuits can cause excessive heating and destructive dissipation. Values are typical. 5. The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating is not exceeded 6. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 7. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating. 8. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. Table 2. Symbol VCC Toper Operating conditions Parameter Supply voltage Operating free-air temperature range -55 to +125 LF151 LF251 6 to 32 -40 to +105 0 to +70 LF351 Unit V °C 3/14 Electrical characteristics LF351 3 Table 3. Symbol Vio DVio Iio Iib Avd SVR ICC Vicm CMR IOS Electrical characteristics Electrical characteristics at VCC = ±15 V, Tamb = +25°C (unless otherwise specified) Parameter Input offset voltage (Rs = 10kΩ) Tmin ≤ Tamb ≤ Tmax Input offset voltage drift Input offset current (1) Tmin ≤ Tamb ≤ Tmax Input bias current (1) Tmin ≤ Tamb ≤ Tmax Large signal voltage gain (RL = 2kΩ Vo = ±10V) , Tmin ≤ Tamb ≤ Tmax Supply voltage rejection ratio (RS = 10kΩ) Tmin ≤ Tamb ≤ Tmax Supply current, no load Tmin ≤ Tamb ≤ Tmax Input common mode voltage range Common mode rejection ratio (RS = 10kΩ) Tmin ≤ Tamb ≤ Tmax Output short-circuit current Tmin ≤ Tamb ≤ Tmax Output voltage swing RL = 2kΩ RL = 10kΩ Tmin ≤ Tamb ≤ Tmax RL = 2kΩ RL = 10kΩ , Slew rate, Vi = 10V, RL = 2kΩ CL = 100pF, unity gain Rise time, Vi = 20mV, RL = 2kΩ CL = 100pF, unity gain , Overshoot, Vi = 20mV, RL = 2kΩ CL = 100pF, unity gain , Gain bandwidth product, f = 100kHz, Vin = 10mV, RL = 2kΩ CL = 100pF , Input resistance Total harmonic distortion f= 1kHz, Av= 20dB, RL= 2kΩ, CL=100pF, Vo= 2Vpp Equivalent input noise voltage RS = 100Ω, f = 1KHz Phase margin 2.5 50 25 80 80 Min. Typ. Max. 3 10 5 20 200 86 1.4 ±11 +15 -12 70 70 10 10 10 12 10 12 12 16 0.1 10 4 1012 0.01 15 45 V/µs µs % MHz Ω % nV ----------Hz Unit mV µV/°C 10 13 100 4 200 20 pA nA pA nA V/mV dB 3.4 3.4 mA V dB 86 40 60 60 mA ±Vopp 12 13.5 V SR tr Kov GBP Ri THD en ∅m Degrees 1. The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature. 4/14 LF351 Electrical characteristics Figure 3. Maximum peak-to-peak output voltage versus frequency Figure 4. Maximum peak-to-peak output voltage versus frequency Figure 5. Maximum peak-to-peak output voltage versus frequency Figure 6. Maximum peak-to-peak output voltage versus free air temp. Figure 7. Maximum peak-to-peak output voltage versus load resistance Figure 8. Maximum peak-to-peak output voltage versus supply voltage 5/14 Electrical characteristics LF351 Figure 9. Input bias current versus free air temperature Figure 10. Large signal differential voltage amplification versus free air temp. Figure 11. Large signal differential voltage amplification and phase shift versus frequency Figure 12. Total power dissipation versus free air temperature Figure 13. Supply current per amplifier versus Figure 14. Supply current per amplifier versus free air temperature supply voltage 6/14 LF351 Electrical characteristics Figure 15. Common mode rejection ratio versus free air temperature Figure 16. Voltage follower large signal pulse response Figure 17. Output voltage versus elapsed time Figure 18. Equivalent input noise voltage versus frequency Figure 19. Total harmonic distortion versus frequency 7/14 Parameter measurement information LF351 4 Parameter measurement information Figure 21. Gain-of-10 inverting amplifier Figure 20. Voltage follower 8/14 LF351 Typical application 5 Typical application Figure 22. Square wave oscillator (0.5 Hz) Figure 23. High Q notch filter 9/14 Package information LF351 6 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. 10/14 LF351 Package information 6.1 DIP8 package information Figure 24. DIP8 package mechanical drawing Table 4. DIP8 package mechanical data Dimensions Ref. Min. A A1 A2 b b2 c D E E1 e eA eB L 2.92 0.38 2.92 0.36 1.14 0.20 9.02 7.62 6.10 Millimeters Typ. Max. 5.33 0.015 3.30 0.46 1.52 0.25 9.27 7.87 6.35 2.54 7.62 10.92 3.30 3.81 0.115 4.95 0.56 1.78 0.36 10.16 8.26 7.11 0.115 0.014 0.045 0.008 0.355 0.300 0.240 Min. Inches Typ. Max. 0.210 0.130 0.018 0.060 0.010 0.365 0.310 0.250 0.100 0.300 0.195 0.022 0.070 0.014 0.400 0.325 0.280 0.430 0.130 0.150 11/14 Package information LF351 6.2 SO-8 package information Figure 25. SO-8 package mechanical drawing Table 5. SO-8 package mechanical data Dimensions Ref. Min. A A1 A2 b c D E E1 e h L k ccc 0.25 0.40 1° 0.10 1.25 0.28 0.17 4.80 5.80 3.80 Millimeters Typ. Max. 1.75 0.25 0.004 0.049 0.48 0.23 4.90 6.00 3.90 1.27 0.50 1.27 8° 0.10 0.010 0.016 1° 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 Min. Inches Typ. Max. 0.069 0.010 0.019 0.010 0.193 0.236 0.154 0.050 0.020 0.050 8° 0.004 0.197 0.244 0.157 12/14 LF351 Ordering information 7 Ordering information Table 6. Order codes Temperature range Package DIP8 -55°C, +125°C SO-8 DIP8 -40°C, +105°C SO-8 DIP8 0°C, +70°C SO-8 Packing Tape Tape or Tape & reel Tape Tape or Tape & reel Tape Tape or Tape & reel Marking LF151N 151 LF251N 251 LF351N 351 Order code LF151N LF151D LF151DT LF251N LF251D LF251DT LF351N LF351D LF351DT 8 Revision history Table 7. Date 17-May-2001 28-April-2008 Document revision history Revision 1 2 Initial release. Updated document format. Changes 13/14 LF351 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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