Manufacturer Part NumberLM13700MX/NOPB
ManufacturerNational Semiconductor
LM13700MX/NOPB datasheet

Specifications of LM13700MX/NOPB

Amplifier TypeTransconductanceNumber Of Circuits2
Output TypePush-PullSlew Rate50 V/µs
Gain Bandwidth Product2MHzCurrent - Input Bias1µA
Voltage - Input Offset300µVCurrent - Supply2.6mA
Current - Output / Channel650µAVoltage - Supply, Single/dual (±)10 V ~ 36 V, ±5 V ~ 18 V
Operating Temperature0°C ~ 70°CMounting TypeSurface Mount
Package / Case16-SOIC (3.9mm Width)Lead Free Status / RoHS StatusLead free / RoHS Compliant
-3db Bandwidth-Other names*LM13700MX
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Dual Operational Transconductance Amplifiers with
Linearizing Diodes and Buffers
General Description
The LM13700 series consists of two current controlled
transconductance amplifiers, each with differential inputs
and a push-pull output. The two amplifiers share common
supplies but otherwise operate independently. Linearizing
diodes are provided at the inputs to reduce distortion and
allow higher input levels. The result is a 10 dB signal-to-
noise improvement referenced to 0.5 percent THD. High
impedance buffers are provided which are especially de-
signed to complement the dynamic range of the amplifiers.
The output buffers of the LM13700 differ from those of the
LM13600 in that their input bias currents (and hence their
output DC levels) are independent of I
performance superior to that of the LM13600 in audio appli-
Connection Diagram
Order Number LM13700M, LM13700MX or LM13700N
© 2004 National Semiconductor Corporation
n g
adjustable over 6 decades
n Excellent g
n Excellent matching between amplifiers
n Linearizing diodes
n High impedance buffers
n High output signal-to-noise ratio
n Current-controlled amplifiers
n Current-controlled impedances
. This may result in
n Current-controlled filters
n Current-controlled oscillators
n Multiplexers
n Timers
n Sample-and-hold circuits
Dual-In-Line and Small Outline Packages
Top View
See NS Package Number M16A or N16A
June 2004

LM13700MX/NOPB Summary of contents

  • Page 1

    ... LM13600 in that their input bias currents (and hence their output DC levels) are independent of I performance superior to that of the LM13600 in audio appli- cations. Connection Diagram Order Number LM13700M, LM13700MX or LM13700N © 2004 National Semiconductor Corporation Features n g adjustable over 6 decades m n Excellent g ...

  • Page 2

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage LM13700 Power Dissipation (Note 25˚C A LM13700N Differential Input Voltage Diode Bias Current ( Amplifier Bias Current (I ) ABC Output Short Circuit Duration ...

  • Page 3

    Electrical Characteristics ± Note 4: These specifications apply for V = 15V the buffers are grounded and outputs are open. ± Note 5: These specifications apply for V = 15V the transconductance amplifier output. Schematic ...

  • Page 4

    Typical Performance Characteristics Input Offset Voltage Input Bias Current Peak Output Voltage and Common Mode Range www.national.com Input Offset Current 00798138 Peak Output Current 00798140 Leakage Current 00798142 4 00798139 00798141 00798143 ...

  • Page 5

    Typical Performance Characteristics Input Leakage Input Resistance Input and Output Capacitance (Continued) 00798144 Amplifier Bias Voltage vs. Amplifier Bias Current 00798146 00798148 5 Transconductance 00798145 00798147 Output Resistance 00798149 www.national.com ...

  • Page 6

    Typical Performance Characteristics Distortion vs. Differential Input Voltage Output Noise vs. Frequency www.national.com (Continued) Voltage vs. Amplifier 00798150 00798152 Unity Gain Follower 6 Bias Current 00798151 00798105 ...

  • Page 7

    Typical Performance Characteristics Leakage Current Test Circuit Circuit Description The differential transistor pair Q and Q 4 ductance stage in that the ratio of their collector currents is defined by the differential input voltage according to the transfer function: where ...

  • Page 8

    Applications Voltage Controlled Amplifiers For optimum signal-to-noise performance, I large as possible as shown by the Output Voltage vs. Ampli- fier Bias Current graph. Larger amplitudes of input signal also improve the S/N ratio. The linearizing diodes help here by ...

  • Page 9

    Applications Voltage Controlled Amplifiers Stereo Volume Control The circuit of Figure 4 uses the excellent matching of the two LM13700 amplifiers to provide a Stereo Volume Control with a typical channel-to-channel gain tracking of 0.3 dB. R provided to minimize ...

  • Page 10

    Stereo Volume Control www.national.com (Continued) FIGURE 4. Stereo Volume Control FIGURE 5. Amplitude Modulator 10 00798111 00798112 ...

  • Page 11

    Stereo Volume Control Noting that the gain of the LM13700 amplifier of Figure 3 may be controlled by varying the linearizing diode current I as well as by varying I , Figure 7 shows an AGC Amplifier ABC using this ...

  • Page 12

    Voltage Controlled Resistors FIGURE 8. Voltage Controlled Resistor, Single-Ended FIGURE 9. Voltage Controlled Resistor with Linearizing Diodes Voltage Controlled Filters OTA’s are extremely useful for implementing voltage con- trolled filters, with the LM13700 having the advantage that the required buffers ...

  • Page 13

    Voltage Controlled Filters FIGURE 10. Floating Voltage Controlled Resistor FIGURE 11. Voltage Controlled Low-Pass Filter (Continued) 13 00798117 00798118 www.national.com ...

  • Page 14

    Voltage Controlled Filters FIGURE 13. Voltage Controlled 2-Pole Butterworth Lo-Pass Filter www.national.com (Continued) FIGURE 12. Voltage Controlled Hi-Pass Filter 14 00798119 00798120 ...

  • Page 15

    Voltage Controlled Filters FIGURE 14. Voltage Controlled State Variable Filter Voltage Controlled Oscillators The classic Triangular/Square Wave VCO of Figure 15 is one of a variety of Voltage Controlled Oscillators which may be built utilizing the LM13700. With the component ...

  • Page 16

    Voltage Controlled Oscillators www.national.com (Continued) FIGURE 15. Triangular/Square-Wave VCO FIGURE 16. Ramp/Pulse VCO 16 00798122 00798123 ...

  • Page 17

    Voltage Controlled Oscillators Figure 18 shows how to build a VCO using one amplifier when the other amplifier is needed for another function. FIGURE 18. Single Amplifier VCO (Continued) FIGURE 17. Sinusoidal VCO Additional Applications Figure 19 presents an interesting ...

  • Page 18

    Additional Applications The operation of the multiplexer of Figure 20 is very straight- forward. When A1 is turned on it holds V when A2 is supplied with bias current then it controls V and R serve to stabilize the unity-gain ...

  • Page 19

    Additional Applications The Schmitt Trigger of Figure 22 uses the amplifier output current into R to set the hysteresis of the comparator; thus Varying I will produce a Schmitt Trigger with H ...

  • Page 20

    Additional Applications The Ramp-and-Hold of Figure 26 sources I whenever the input brought high, giving a ramp-rate of about 1V/ms for the component values shown. The true-RMS converter of Figure 27 is essentially an auto- matic gain ...

  • Page 21

    Additional Applications (Continued) FIGURE 25. Sample-Hold Circuit FIGURE 26. Ramp and Hold 21 00798132 00798133 www.national.com ...

  • Page 22

    Additional Applications The circuit of Figure voltage reference of variable Temperature Coefficient. The 100 kΩ potentiometer adjusts the output voltage which has a positive TC above 1.2V, zero TC at about 1.2V, and negative TC below 1.2V. ...

  • Page 23

    Additional Applications (Continued) FIGURE 28. Delta VBE Reference FIGURE 29. Pulse Width Modulator 23 00798135 00798136 www.national.com ...

  • Page 24

    Additional Applications www.national.com (Continued) FIGURE 30. Logarithmic Current Source 24 00798137 ...

  • Page 25

    Physical Dimensions inches (millimeters) unless otherwise noted S.O. Package (M) Order Number LM13700M or LM13700MX NS Package Number M16A Molded Dual-In-Line Package (N) Order Number LM13700N NS Package Number N16A 25 www.national.com ...

  • Page 26

    ... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...