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  • VCA824: Thermal information

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    Part Number: VCA824 Hi, I would like to ask you about "Thermal resistance" of VCA824ID(SO-14). According to the datasheet 4page( would like to ask7.4 Thermal information), ΘJA=90.3 ℃/W. But there describes "80℃/W" to calculate the Tj at…
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  • VCA824: When importing the Pspice model of the VCA824 into the ADS, there is no 14-pin model

    TI Thinks Resolved
    Part Number: VCA824 Other Parts Discussed in Thread: TINA-TI I need a VCA824 model with 14 pins, but when importing the Pspice model of the VCA824 into ADS, this model is not in the options，please tell me why？

  • VCA824: ACG (automatic gain control) reference circuit for MIC audio signal

    TI Thinks Resolved
    Part Number: VCA824 Other Parts Discussed in Thread: VCA820 Hi Team, Does this part have any ACG (automatic gain control) reference circuit for MIC application? Thanks. Best Regards, Tess Chen
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  • VCA824: Max Quiescent Current

    Resolved
    Part Number: VCA824 Hi, Let me confirm the value of "Max Iq". There described the value is 38.5mA (Ta=-40℃ to 85℃) on the datasheet page6. This value means at totally +/-5Vcc, not separate +Vcc/-Vcc, that is to say, 38.5mA/+5Vcc and 38.5mA/…
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  • VCA824: output baseline is different under different gains

    TI Thinks Resolved
    Part Number: VCA824 Hi team, When customer is using VCA824, they found that the output baseline is different under different gains. For example, the output baseline difference between 0dB and 26dB gain is more than 100mV, even if the input and output…
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  • THS3491: THS3491+VCA824 circuit problem

    Resolved
    Part Number: THS3491 Other Parts Discussed in Thread: VCA824 Hi, I would like to ask you to give me your advice about THS3491-VCA824 circuit. The problem is the gain difference between design value and measured value. I designed the THS3491 gain as around…
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  • VCA824: Basic question

    Resolved
    Part Number: VCA824 Hi, I would like to ask you a basic question about the circuit of Fig76, datasheet 29page. There are 2 input registers in the circuit, R2/R3. I think that the input registance of VCA824 is set by the registers. Will you tell me how…
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  • VCA824: RF(feedback registance) value

    Resolved
    Part Number: VCA824 Hi, Will you tell me the frequency response data about "RF" (feedback) value? According to the datasheet, I suppose that "453ohm" seems to be best value about 2V/V and "402ohm" seems to be best for over 10V/V.…
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    • Answered

  • VCA824: Question about Fig19 and Fig20

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    Part Number: VCA824 Hi I would like to ask you a question about Fig19 and Fig20, 10 page on the datasheet as below. Q1) Fig19 Rs means "Load" registance, not input registance, right? Q2) Fig20 X and Y axis seems to be not correct...probably…
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  • VCA824: VCA824: constant phase at different gain

    Resolved
    Part Number: VCA824 Hello, I am working on a redesign, I want a variable gain amplifier that has the same phase with different gain. In the old system it was done using an opamp and a digital potentiometer, noninverting amplifier. But because I'm changing…
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