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LM13700 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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LM13700 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 37 page LM13700 www.ti.com 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 Submit Documentation Feedback 11 Product Folder Links: LM13700 |
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