LM13700 National Semiconductor, LM13700 Datasheet

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LM13700

Manufacturer Part Number
LM13700
Description
Manufacturer
National Semiconductor
Datasheet

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© 2004 National Semiconductor Corporation
LM13700
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-
cations.
Connection Diagram
Order Number LM13700M, LM13700MX or LM13700N
ABC
Dual-In-Line and Small Outline Packages
See NS Package Number M16A or N16A
DS007981
. This may result in
Top View
Features
n g
n Excellent g
n Excellent matching between amplifiers
n Linearizing diodes
n High impedance buffers
n High output signal-to-noise ratio
Applications
n Current-controlled amplifiers
n Current-controlled impedances
n Current-controlled filters
n Current-controlled oscillators
n Multiplexers
n Timers
n Sample-and-hold circuits
m
adjustable over 6 decades
m
linearity
00798102
www.national.com
June 2004

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LM13700 Summary of contents

Page 1

... 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- cations ...

Page 2

... Note 2: For operation at ambient temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance, junction to ambient, as follows: LM13700N, 90˚C/W; LM13700M, 110˚C/W. Note 3: Buffer output current should be limited not exceed package dissipation. ...

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

... 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 the output offset voltage and may be replaced with two 510Ω resistors in AC-coupled applications. ...

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 approach reaches a high enough amplitude O ( turn on the Darlington transistors and the lineariz- ...

Page 12

... 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 are included on the I.C. The VC Lo-Pass Filter of Figure 11 performs as a unity-gain buffer amplifier at ...

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

... I The VC Lo-Pass Filter of Figure 11 may be used to produce a high-quality sinusoidal VCO. The circuit of Figure 16 em- ploys two LM13700 packages, with three of the amplifiers configured as lo-pass filters and the fourth as a limiter/ inverter. The circuit oscillates at the frequency at which the loop phase-shift is 360˚ ...

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

... A2 is supplied with bias current then it controls V and R serve to stabilize the unity-gain configuration of C amplifiers A1 and A2. The maximum clock rate is limited to about 200 kHz by the LM13700 slew rate into 150 pF when the (V –V ) differential is at its maximum allowable value IN1 IN2 of 5V ...

Page 19

... I , where V and V represent the maximum low and maxi mum high output voltage swing of the LM13700 added to provide a discharge path for C when A1 switches low. t (Continued) FIGURE 21. Phase Lock Loop FIGURE 22. Schmitt Trigger The Peak Detector of Figure 24 uses A2 to turn on A1 ...

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

... TC above 1.2V, zero TC at about 1.2V, and negative TC below 1.2V. This is accomplished by balancing the TC of the A2 transfer function against the complementary TC of D1. The wide dynamic range of the LM13700 allows easy control of the output pulse width in the Pulse Width Modulator of Figure 29. For generating I ...

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. ...

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