LF253, LF353 Wide bandwidth dual JFET operational amplifiers Features ■ 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) N DIP8 (Plastic package) D SO-8 (Plastic micro package) Description These circuits are high speed JFET input dual 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 8 2 - 3 + 4 7 - 6 + 5 1 - Output1 2 - Inverting input 1 3 - Non-inverting input 1 4 - VCC5 - Non-inverting input 2 6 - Inverting input 2 7 - Output 2 8 - VCC+ March 2010 Doc ID 2153 Rev 3 1/15 www.st.com 15 Schematics LF253, LF353 1 Schematics Figure 1. Schematic diagram (each amplifier) VCC+ Non-inverting input Inverting input 100 Ω 200 Ω Output 100 Ω 30 k 8.2 k 1.3 k 35 k 1.3 k 35 k VCC- Offset Null1 2/15 Offset Null2 Doc ID 2153 Rev 3 100 Ω LF253, LF353 Absolute maximum ratings and operating conditions 2 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Value Unit ±18 V ±15 V ±30 V Rthja Thermal resistance junction to ambient(4) SO-8 DIP8 125 85 °C/W Rthjc Thermal resistance junction to case(4) SO-8 DIP8 40 41 °C/W VCC Vi Vid Parameter Supply voltage(1) Input voltage (2) Differential input voltage (3) Output short-circuit duration(5) Tstg ESD Infinite Storage temperature range -65 to +150 °C HBM: human body model(6) 1 kV 200 V 1.5 kV MM: machine model (7) (8) CDM: charged device model 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. Operating conditions Symbol Parameter LF253 VCC Supply voltage Toper Operating free-air temperature range LF353 6 to 36 Doc ID 2153 Rev 3 -40 to +105 Unit V 0 to +70 °C 3/15 Electrical characteristics LF253, LF353 3 Electrical characteristics Table 3. Electrical characteristics at VCC = ±15 V, Tamb = +25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Input offset voltage (Rs = 10kΩ) Tmin ≤ Tamb ≤ Tmax 3 Input offset voltage drift 10 Iio Input offset current (1) Tmin ≤ Tamb ≤ Tmax 5 100 4 pA nA Iib Input bias current (1) Tmin ≤ Tamb ≤ Tmax 20 200 20 pA nA Avd Large signal voltage gain (RL = 2kΩ, Vo = ±10V) Tmin ≤ Tamb ≤ Tmax 50 25 200 SVR Supply voltage rejection ratio (RS = 10kΩ) Tmin ≤ Tamb ≤ Tmax 80 80 86 Vio DVio mV µV/°C V/mV dB ICC Supply current, no load Tmin ≤ Tamb ≤ Tmax Vicm Input common mode voltage range ±11 +15 -12 V CMR Common mode rejection ratio (RS = 10kΩ) Tmin ≤ Tamb ≤ Tmax 70 70 86 dB Output short-circuit current Tmin ≤ Tamb ≤ Tmax 10 10 40 10 12 12 13.5 IOS ±Vopp SR 1.4 10 13 Output voltage swing RL = 2kΩ RL = 10kΩ Tmin ≤ Tamb ≤ Tmax RL = 2kΩ RL = 10kΩ 3.2 3.2 60 60 mA mA V 10 12 Slew rate, Vi = 10V, RL = 2kΩ, CL = 100pF, unity gain 12 16 V/µs tr Rise time, Vi = 20mV, RL = 2kΩ, CL = 100pF, unity gain 0.1 µs Kov Overshoot, Vi = 20mV, RL = 2kΩ, CL = 100pF, unity gain 10 % 4 MHz GBP Ri THD Gain bandwidth product, f = 100kHz, Vin = 10mV, RL = 2kΩ, CL = 100pF 2.5 Input resistance 10 12 Ω Total harmonic distortion, f= 1kHz, Av= 20dB, RL= 2kΩ, CL=100pF, Vo= 2Vpp 0.01 % en Equivalent input noise voltage RS = 100Ω, f = 1KHz 15 nV -----------Hz ∅m Phase margin 45 Degrees Channel separation (Av = 100) 120 dB Vo1/Vo2 1. The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature. 4/15 Doc ID 2153 Rev 3 LF253, LF353 Figure 2. Electrical characteristics Maximum peak-to-peak output voltage vs. frequency, RL = 2 kΩ VCC = +/- 15 V Figure 3. Maximum peak-to-peak output voltage vs. frequency, RL = 10 kΩ RL = 10 kΩ RL = 2 kΩ VCC = +/- 10 V VCC = +/- 10 V VCC = +/- 5 V VCC = +/- 5 V Figure 4. Maximum peak-to-peak output voltage versus frequency Tamb = +25°C Tamb = +25°C VCC = +/- 15 V Tamb = +25°C Figure 5. Maximum peak-to-peak output voltage versus free air temperature VCC = +/- 15 V RL = 2 kΩ RL = 10 kΩ RL = 2 kΩ Tamb = -55°C VCC = +/- 15 V Tamb = +125°C Figure 6. Maximum peak-to-peak output voltage versus load resistance Figure 7. VCC = +/- 15 V Tamb = +25°C Maximum peak-to-peak output voltage versus supply voltage RL = 10 kΩ Tamb = +25°C LOAD RESISTANCE (kΩ) Doc ID 2153 Rev 3 5/15 Electrical characteristics Figure 8. LF253, LF353 Input bias current versus free air temperature Figure 9. Large signal differential voltage amplification versus free air temp. VCC = +/- 15 V VCC = +/- 15 V VO = +/- 10 V RL = 2 kΩ Figure 10. Large signal differential voltage amplification and phase shift versus frequency Phase shift (right scale) Figure 11. Total power dissipation versus free air temperature Differential voltage amplification (left scale) VCC = +/- 15 V No signal no load RL = 2 kΩ CL = 100 pF VCC = +/- 15 V Tamb = +125°C Figure 12. Supply current per amplifier versus Figure 13. Supply current per amplifier versus free air temperature supply voltage 6/15 VCC = +/- 15 V Tamb = +25°C No signal no load No signal no load Doc ID 2153 Rev 3 LF253, LF353 Electrical characteristics Figure 14. Common mode rejection ratio versus free air temperature Figure 15. Voltage follower large signal pulse response RL = 10 kΩ OUTPUT INPUT VCC = +/- 15 V VCC = +/- 15 V RL = 2 kΩ CL = 100 pF Tamb = +25°C μs Figure 16. Output voltage versus elapsed time Figure 17. Equivalent input noise voltage versus frequency VCC = +/- 15 V OVERSHOOT AV = 10 RS = 100 Ω Tamb = +25°C VCC = +/- 15 V RL = 2 kΩ Tamb = +25°C tr μs Figure 18. Total harmonic distortion versus frequency VCC = +/- 15 V AV = 1 Vo(rms) = 6 V Tamb = +25°C Doc ID 2153 Rev 3 7/15 Parameter measurement information 4 LF253, LF353 Parameter measurement information Figure 19. Voltage follower Figure 20. Gain of 10 inverting amplifier 10 kΩ 1 kΩ eI 1/2 LF253 eI 8/15 eO CL = 100 pF RL = 2 kΩ 1/2 LF253 eO RL Doc ID 2153 Rev 3 CL = 100 pF LF253, LF353 5 Typical application Typical application Figure 21. Quadruple oscillator Doc ID 2153 Rev 3 9/15 Package information 6 LF253, LF353 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 10/15 Doc ID 2153 Rev 3 LF253, LF353 6.1 Package information DIP8 package information Figure 22. DIP8 package mechanical drawing Table 4. DIP8 package mechanical data Dimensions Ref. Millimeters Min. Typ. A Inches Max. Min. Typ. 5.33 Max. 0.210 A1 0.38 0.015 A2 2.92 3.30 4.95 0.115 0.130 0.195 b 0.36 0.46 0.56 0.014 0.018 0.022 b2 1.14 1.52 1.78 0.045 0.060 0.070 c 0.20 0.25 0.36 0.008 0.010 0.014 D 9.02 9.27 10.16 0.355 0.365 0.400 E 7.62 7.87 8.26 0.300 0.310 0.325 E1 6.10 6.35 7.11 0.240 0.250 0.280 e 2.54 0.100 eA 7.62 0.300 eB L 10.92 2.92 3.30 3.81 Doc ID 2153 Rev 3 0.430 0.115 0.130 0.150 11/15 Package information 6.2 LF253, LF353 SO-8 package information Figure 23. SO-8 package mechanical drawing Table 5. SO-8 package mechanical data Dimensions Ref. Millimeters Min. Typ. A Max. Min. Typ. 1.75 0.25 Max. 0.069 A1 0.10 A2 1.25 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 0.004 0.010 0.049 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 L1 k ccc 12/15 Inches 1.04 1° 0.040 8° 0.10 Doc ID 2153 Rev 3 1° 8° 0.004 LF253, LF353 7 Ordering information Ordering information Table 6. Order codes Order code Temperature range LF253N LF253D LF253DT Packing Marking DIP8 Tube LF253N SO-8 Tube or Tape & reel 253 DIP8 Tube LF353N SO-8 Tube or Tape & reel 353 -40°C, +105°C LF353N LF353D LF353DT Package 0°C, +70°C Doc ID 2153 Rev 3 13/15 Revision history 8 LF253, LF353 Revision history Table 7. 14/15 Document revision history Date Revision Changes 01-Mar-2001 1 Initial release. 08-Sep-2008 2 Updated document format. Removed information concerning military temperature range (LF153). Added L1 parameter dimensions in Table 5: SO-8 package mechanical data. 25-Mar-2010 3 Corrected error in Table 6: Order codes: LF253N, LF253D, LF353N and LF353D proposed in tube packing. Doc ID 2153 Rev 3 LF253, LF353 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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