Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp J-FET SOIC 8

LF155, LF156, LF355, LF356, LF357

www.ti.com

SNOSBH0C –MAY 2000–REVISED MARCH 2013

LF155/LF156/LF256/LF257/LF355/LF356/LF357 JFET Input Operational Amplifiers

Check for Samples: LF155, LF156, LF355, LF356, LF357

FEATURES

DESCRIPTION

These are the first monolithic JFET input operational

Advantages

amplifiers to incorporate well matched, high voltage

• Replace Expensive Hybrid and Module FET Op

JFETs on the same chip with standard bipolar

Amps

transistors ( BI-FET™ Technology). These amplifiers

• Rugged JFETs Allow Blow-Out Free Handling

feature low input bias and offset currents/low offset

voltage and offset voltage drift, coupled with offset

Compared with MOSFET Input Devices

adjust which does not degrade drift or common-mode

• Excellent for Low Noise Applications Using

rejection. The devices are also designed for high slew

Either High or Low Source Impedance—Very

rate, wide bandwidth, extremely fast settling time, low

Low 1/f Corner

voltage and current noise and a low 1/f noise corner.

• Offset Adjust Does Not Degrade Drift or

Common-Mode Rejection as in Most

Common Features

Monolithic Amplifiers

• Low Input Bias Current: 30pA

• New Output Stage Allows Use of Large

• Low Input Offset Current: 3pA

Capacitive Loads (5,000 pF) without Stability

• High Input Impedance: 10

Problems

• Low Input Noise Current: 0.01 pA/√Hz

• Internal Compensation and Large Differential

• High Common-Mode Rejection Ratio: 100 dB

Input Voltage Capability

• Large DC Voltage Gain: 106 dB

APPLICATIONS

Table 1. Uncommon Features

• Precision High Speed Integrators

LF155/ LF156/ LF257/ Units

LF355 LF256/ LF357

• Fast D/A and A/D Converters

LF356 (A

=5)

• High Impedance Buffers

Extremely fast 4 1.5 1.5 μs

settling time to 0.01%

• Wideband, Low Noise, Low Drift Amplifiers

Fast slew rate 5 12 50 V/µs

• Logarithmic Amplifiers

Wide gain bandwidth 2.5 5 20 MHz

• Photocell Amplifiers

Low input noise 20 12 12 nV / √Hz

• Sample and Hold Circuits

voltage

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2BI-FET is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (32 pages)

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LF155, LF156, LF355, LF356, LF357 www.ti.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Simplified Schematic *3pF in LF357 series. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LF155, LF156, LF355, LF356, LF357 www.ti.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 AC Electrical Characteristics TA = TJ = 25°C, VS = ±15V Symbol SR Parameter LF155/355 LF156/256/ 356B LF156/256/356/ LF356B LF257/357 Typ Min Typ Typ 5 7.5 12 Conditions Slew Rate LF155/6: AV=1, LF357: AV=5 GBW Gain Bandwidth Product ts Settling Time to 0.01% en Equivalent Input Noise Voltage in CIN (1) Equivalent Input Current Noise Units V/μs 50 V/μs 2.5 5 20 MHz 4 1.5 1.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Typical DC Performance Characteristics Curves are for LF155 and LF156 unless otherwise specified. 6 Input Bias Current Input Bias Current Figure 1. Figure 2. Input Bias Current Voltage Swing Figure 3. Figure 4. Supply Current Supply Current Figure 5. Figure 6.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Typical DC Performance Characteristics (continued) Curves are for LF155 and LF156 unless otherwise specified. Negative Current Limit Positive Current Limit Figure 7. Figure 8. Positive Common-Mode Input Voltage Limit Negative Common-Mode Input Voltage Limit Figure 9. Figure 10. Open Loop Voltage Gain Output Voltage Swing Figure 11. Figure 12.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Typical AC Performance Characteristics Gain Bandwidth Gain Bandwidth Figure 13. Figure 14. Normalized Slew Rate Output Impedance Figure 15. Figure 16. Output Impedance Figure 17.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Typical AC Performance Characteristics (continued) LF155 Small Signal Pulse Response, AV = +1 LF156 Small Signal Pulse Response, AV = +1 Figure 18. Figure 19. LF155 Large Signal Pulse Response, AV = +1 LF156 Large Signal Puls Response, AV = +1 Figure 20. Figure 21. Inverter Settling Time Inverter Settling Time Figure 22. Figure 23.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Typical AC Performance Characteristics (continued) 10 Open Loop Frequency Response Bode Plot Figure 24. Figure 25. Bode Plot Bode Plot Figure 26. Figure 27. Common-Mode Rejection Ratio Power Supply Rejection Ratio Figure 28. Figure 29.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Typical AC Performance Characteristics (continued) Power Supply Rejection Ratio Undistorted Output Voltage Swing Figure 30. Figure 31. Equivalent Input Noise Voltage Equivalent Input Noise Voltage (Expanded Scale) Figure 32. Figure 33.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com DETAILED SCHEMATIC *C = 3pF in LF357 series. Connection Diagrams (Top Views) *Available per JM38510/11401 or JM38510/11402 Figure 34. TO-99 Package (LMC) See Package Number LMC (O-MBCY-W8) 12 Submit Documentation Feedback Figure 35.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 APPLICATION HINTS These are op amps with JFET input devices. These JFETs have large reverse breakdown voltages from gate to source and drain eliminating the need for clamps across the inputs. Therefore large differential input voltages can easily be accommodated without a large increase in input current. The maximum differential input voltage is independent of the supply voltages.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com * LF155/6 R = 5k, LF357 R = 1.25k Figure 37. Driving Capacitive Loads Due to a unique output stage design, these amplifiers have the ability to drive large capacitive loads and still maintain stability. CL(MAX) ≃ 0.01μF. Overshoot ≤ 20%, Settling time (ts) ≃ 5μs For distortion ≤ 1% and a 20 Vp-p VOUT swing, power bandwidth is: 500kHz. Figure 38. LF357 - A Large Power BW Amplifier Typical Applications Figure 39.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Large Signal Inverter Output, VOUT (from Settling Time Circuit) Figure 40. LF355 Figure 41.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Figure 42. LF357 Figure 43. Low Drift Adjustable Voltage Reference • • • • • 16 Δ VOUT/ΔT = ±0.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Figure 44. Fast Logarithmic Converter • • • • • Dynamic range: 100μA ≤ Ii ≤ 1mA (5 decades), |VO| = 1V/decade Transient response: 3μs for ΔIi = 1 decade C1, C2, R2, R3: added dynamic compensation VOS adjust the LF156 to minimize quiescent error RT: Tel Labs type Q81 + 0.3%/°C Figure 45. Precision Current Monitor • • • VO = 5 R1/R2 (V/mA of IS) R1, R2, R3: 0.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Figure 46. 8-Bit D/A Converter with Symmetrical Offset Binary Operation • • R1, R2 should be matched within ±0.05% Full-scale response time: 3μs EO B1 B2 B3 B4 B5 B6 B7 B8 Comments +9.920 1 1 1 1 1 1 1 1 Positive Full-Scale +0.040 1 0 0 0 0 0 0 0 (+) Zero-Scale −0.040 0 1 1 1 1 1 1 1 (−) Zero-Scale −9.920 0 0 0 0 0 0 0 0 Negative Full-Scale Figure 47.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 R1, R4 matched. Linearity 0.1% over 2 decades. Figure 49. Decades VCO Figure 50. Isolating Large Capacitive Loads • • • Overshoot 6% ts 10μs When driving large CL, the VOUT slew rate determined by CL and IOUT(MAX): Figure 51. Low Drift Peak Detector • • • • By adding D1 and Rf, VD1=0 during hold mode. Leakage of D2 provided by feedback path through Rf.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Figure 52. Non-Inverting Unity Gain Operation for LF157 Figure 53.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Figure 54. High Impedance, Low Drift Instrumentation Amplifier • • System VOS adjusted via A2 VOS adjust Trim R3 to boost up CMRR to 120 dB.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com Figure 55.
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LF155, LF156, LF355, LF356, LF357 www.ti.com SNOSBH0C – MAY 2000 – REVISED MARCH 2013 Figure 57. High Q Band Pass Filter • • • By adding positive feedback (R2) Q increases to 40 fBP = 100 kHz • • Clean layout recommended Response to a 1Vp-p tone burst: 300μs Figure 58.
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LF155, LF156, LF355, LF356, LF357 SNOSBH0C – MAY 2000 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision B (March 2013) to Revision C • 24 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LF356MX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LF356MX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LF356MX SOIC D 8 2500 367.0 367.0 35.0 LF356MX/NOPB SOIC D 8 2500 367.0 367.0 35.
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