LF253, LF353


Wide bandwidth dual JFET operational amplifiers


Features


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.

8

1

The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient.


2

7


3

+

6


4

+

5



  1. - Output1

  2. - Inverting input 1

  3. - Non-inverting input 1

  4. - VCC-

  5. - 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


  1. Schematics


    Figure 1. Schematic diagram (each amplifier)


    VCC+


    Non-inverting

    input


    Inverting input


    100 Ω

    200 Ω


    Output


    30k

    100 Ω


    8.2 k


    1.3 k

    35 k

    1.3 k

    35 k 100 Ω


    VCC-



    Offset Null1

    Offset Null2


  2. Absolute maximum ratings and operating conditions


    Table 1. Absolute maximum ratings

    Symbol

    Parameter

    Value

    Unit

    VCC

    Supply voltage(1)

    ±18

    V

    Vi

    Input voltage(2)

    ±15

    V

    Vid

    Differential input voltage(3)

    ±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


    Output short-circuit duration(5)

    Infinite


    Tstg

    Storage temperature range

    -65 to +150

    °C


    ESD

    HBM: human body model(6)

    1

    kV

    MM: machine model(7)

    200

    V

    CDM: charged device model(8)

    1.5

    kV

    1. All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages

      CC

      .

      CC

      where the zero reference level is the midpoint between V + and V -

    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

    LF353

    Unit

    VCC

    Supply voltage

    6 to 36

    V

    Toper

    Operating free-air temperature range

    -40 to +105

    0 to +70

    °C


    Doc ID 2153 Rev 3 3/15


  3. Electrical characteristics


    Table 3. Electrical characteristics at VCC = ±15 V, Tamb = +25°C (unless otherwise specified)

    Symbol

    Parameter

    Min.

    Typ.

    Max.

    Unit

    Vio

    Input offset voltage (Rs 10kΩ) Tmin Tamb Tmax


    3

    10

    13

    mV

    DVio

    Input offset voltage drift


    10


    µV/°C

    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


    V/mV

    SVR

    Supply voltage rejection ratio (RS 10kΩ Tmin Tamb Tmax

    80

    80

    86


    dB

    ICC

    Supply current, no load

    Tmin Tamb Tmax


    1.4

    3.2

    3.2

    mA

    Vicm

    Input common mode voltage range

    ±11

    +15

    -12


    V

    CMR

    Common mode rejection ratio (RS 10kΩ Tmin Tamb Tmax

    70

    70

    86


    dB

    IOS

    Output short-circuit current

    Tmin Tamb Tmax

    10

    10

    40

    60

    60

    mA


    ±Vopp

    Output voltage swing

    RL = 2kΩ RL = 10kΩ

    Tmin Tamb Tmax RL = 2kΩ

    RL = 10kΩ


    10

    12


    10

    12


    12

    13.5



    V

    SR

    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


    %

    GBP

    Gain bandwidth product, f = 100kHz, Vin = 10mV, RL = 2kΩ, CL = 100pF

    2.5

    4


    MHz

    Ri

    Input resistance


    1012


    Ω

    THD

    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


    ---n--V-----

    Hz

    m

    Phase margin


    45


    Degrees

    Vo1/Vo2

    Channel separation (Av = 100)


    120


    dB

    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


    Figure 2. Maximum peak-to-peak output voltage vs. frequency, RL = 2 kΩ

    Figure 3. Maximum peak-to-peak output voltage vs. frequency, RL = 10 kΩ


    VCC = +/- 15 V


    R = 2 kΩ




    RL = 10 kΩ


    Tamb = +25°C

    VCC = +/- 15 V


    Tamb = +25°C


    VCC = +/- 10 V


    VCC = +/- 10 V




    VCC = +/- 5 V




    VCC = +/- 5 V



    Tamb = -55°C

    CC

    RL = 2 kΩ

    V = +/- 15 V

    Tamb = +25°C

    Figure 4. Maximum peak-to-peak output voltage versus frequency

    Figure 5. Maximum peak-to-peak output voltage versus free air temperature






























    RL = 10 kΩ

    RL = 2 kΩ

















    VCC = +/- 15 V












    Tamb = +125°C

    Figure 6. Maximum peak-to-peak output voltage versus load resistance


    Figure 7. Maximum peak-to-peak output voltage versus supply voltage


    VCC = +/- 15 V Tamb = +25°C

    RL = 10 kΩ

    Tamb = +25°C


    LOAD RESISTANCE (kΩ)


    Doc ID 2153 Rev 3 5/15


    Figure 8. 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




























    VCC = +/- 15 V

    No signal no load
































































    Figure 10. Large signal differential voltage amplification and phase shift versus frequency


    Figure 11. Total power dissipation versus free air temperature


    Phase shift (right scale)

    Differential voltage amplification (left scale)



    RL = 2 kΩ CL = 100 pF

    VCC = +/- 15 V

    Tamb = +125°C

    Figure 12. Supply current per amplifier versus free air temperature


    Figure 13. Supply current per amplifier versus supply voltage









    VCC = +/- 15 V

    No signal no load



































































    Tamb = +25°C

    No signal no load









































































    6/15 Doc ID 2153 Rev 3


    Figure 14. Common mode rejection ratio versus free air temperature

    Figure 15. Voltage follower large signal pulse response



    RL = 10 kΩ


    OUTPUT



    VCC = +/- 15 V



    INPUT



    VCC = +/- 15 V




    RL = 2 kΩ




    CL = 100 pF




    Tamb = +25°C






    s



    Figure 16. Output voltage versus elapsed time Figure 17. Equivalent input noise voltage

    versus frequency











    OVER

    SHOOT






































    VCC = +/- 15 V RL = 2 kΩ Tamb = +25°C










    tr




    VCC = +/- 15 V AV = 10

    RS = 100 Ω

    Tamb = +25°C


    s


    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


  4. Parameter measurement information


    Figure 19. Voltage follower Figure 20. Gain of 10 inverting amplifier


    eI


    1/2

    LF253


    CL = 100 pF


    RL = 2 kΩ


    eO


    eI


    1 kΩ


    10 kΩ


    1/2

    LF253


    RL


    eO


    CL = 100 pF


    8/15 Doc ID 2153 Rev 3


  5. Typical application


    Figure 21. Quadruple oscillator


    Doc ID 2153 Rev 3 9/15


  6. 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


    1. DIP8 package information

      Figure 22. DIP8 package mechanical drawing


      Table 4. DIP8 package mechanical data


      Ref.

      Dimensions

      Millimeters

      Inches

      Min.

      Typ.

      Max.

      Min.

      Typ.

      Max.

      A



      5.33



      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



      10.92



      0.430

      L

      2.92

      3.30

      3.81

      0.115

      0.130

      0.150


      Doc ID 2153 Rev 3 11/15


    2. SO-8 package information

      Figure 23. SO-8 package mechanical drawing


      Table 5. SO-8 package mechanical data


      Ref.

      Dimensions

      Millimeters

      Inches

      Min.

      Typ.

      Max.

      Min.

      Typ.

      Max.

      A



      1.75



      0.069

      A1

      0.10


      0.25

      0.004


      0.010

      A2

      1.25



      0.049



      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


      1.27



      0.050


      h

      0.25


      0.50

      0.010


      0.020

      L

      0.40


      1.27

      0.016


      0.050

      L1


      1.04



      0.040


      k



      ccc



      0.10



      0.004


      12/15 Doc ID 2153 Rev 3


  7. Ordering information


    Table 6. Order codes


    Order code

    Temperature range


    Package


    Packing


    Marking

    LF253N


    -40°C, +105°C

    DIP8

    Tube

    LF253N

    LF253D LF253DT

    SO-8

    Tube or Tape & reel

    253

    LF353N


    0°C, +70°C

    DIP8

    Tube

    LF353N

    LF353D LF353DT

    SO-8

    Tube or Tape & reel

    353


    Doc ID 2153 Rev 3 13/15


  8. Revision history


Table 7. 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.


14/15 Doc ID 2153 Rev 3


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Doc ID 2153 Rev 3 15/15

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