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LM13700 Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte LM13700
Spiegazioni elettronici  Dual Operational Transconductance Amplifiers
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LM13700
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SNOSBW2F – NOVEMBER 1999 – REVISED NOVEMBER 2015
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
An OTA is a versatile building block analog component that can be considered an ideal transistor. The LM13700
can be used in a wide variety of applications, from voltage-controlled amplifiers and filters to VCOs. The 2 well-
matched, independent channels make the LDC13700 well suited for stereo audio applications.
8.2 Typical Application
Figure 17. Voltage Controlled Amplifier
8.2.1 Design Requirements
For this example application, the system requirements provide a volume control for a 1 VP input signal with a
THD < 0.1% using ±15 V supplies. The volume control varies between -13 V and 15 V and needs to provide an
adjustable gain range of >30dB.
8.2.2 Detailed Design Procedure
Using the linearizing diodes is recommended for most applications, as they greatly reduce the output distortion. It
is required that the diode bias current, ID be greater than twice the input current, IS. As the input voltage has a
DC level of 0 V, the Diode Bias input pins are 1 diode drop above 0 V, which is +0.7 V. Tying the bias to the
clean V+ supply, results in a voltage drop of 14.3 V across RD. Using the recommended 1mA for ID is appropriate
here, and with VS=+15 V, the voltage drop is 14.3 V, and so using the standard value of 13-k
Ω is acceptable and
will provide the desired gain control.
To obtain the <0.1% THD requirement, the differential input voltage must be <60mVpp when the linearizing
diodes are used. The input divider on the input will reduce the 1 VP input to 33mVPP, which is within the desired
spec.
Next, set IBIAS. The Bias Input pins (pins 1 or 16), are 2 diode drops above the negative supply, and therefore
VBIAS = 2(VBE) + V- , which for this application is -13.6 V. To set IBIAS to 1ma when VC = 15 V requires a 28.6-kΩ;
30-k
Ω is a standard value and is used for this application. The gain will be linear with the applied voltage.
Copyright © 1999–2015, Texas Instruments Incorporated
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