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  • VCA821: the Bottom of my VCA821 output waveform has distortion

    Part Number: VCA821 My test of the board shows that the waveform would not have distortioin if it output within about 70mVpp but it would have distortion if it output too high I have asked someone, be told that my input have offset，but the…

  • VCA821：I think there is something wrong in the picture of datasheet, Is there someone who have succeed simulating the circuit of this picture?

    TI Thinks Resolved
    Part Number: VCA821 Hello, I think there is something wrong in the picture of datasheet, Is there someone who have succeed simulating the circuit of this picture? I simulated this circuit with Multisim，but can't achieve the function of AGC.

  • Cascading OPA847 and VCA821

    Other Parts Discussed in Thread: VCA821 , OPA847 I cascaded the OPA847 and VCA821 my input signal was around 20mV (sine wave) the OPA847 was set at a gain of 20. the VCA821 was set at a gain of 2. However, the output at the VCA821 looked like…

  • RE: VCA821： Refer to the VCA data manual (Figure 1), and design the automatic gain control circuit (Figure 2) in Multisim for simulation experiments. Experiments result shows tha this circuit does not achieve the function of gain control . Can anyone...

    Closing this thread as it is being addressed here: Best, Hasan Babiker
    • Answered

  • vca821 Vout(pp) vs max gain adj range

    Resolved
    On its datasheet page 9, figure 3, I wonder how I could get the value of 20dB from Vpp = 1V on the curve Rf=1kohm ? ( basically, how could I use the equation there to get the plot ? ) I tried myself with all equations in the datasheet but still could…
    • Resolved

  • RE: A question about VCA821

    Hello Zhe, It looks to me like figure 34 should have been a linear scale instead of logarithmic. The curves line up well at the left and right side of the graph, but you are correct, they don't look accurate in the middle. If you check the EC table…
    • Answered

  • RE: VCA820 / VCA821 VCTRL0 and VSLOPE

    Resolved
    Hi Kazuhiko, Yes, the Vctrl0 and Vslope in the VCA820/VCA821 datasheet are constants to estimate gain deviation for different gain control voltages and their units are voltage (V). The below plot in the datasheet with the equation provides the use case…
    • Answered

  • LMH6505: AGC circuits at V+/V- = 7V/0V

    Resolved
    Part Number: LMH6505 Other Parts Discussed in Thread: VCA822 , VCA820 , VCA821 , VCA824 , LMH6714 , LMH6609 Hello, My customer would like to use LMH6505 as an AGC described in the figure 49 in the datasheet. However, they would like to use LMH6505 with…
    • Resolved

  • INA149: Seek for alternative materials or alternative solutions

    Part Number: INA149 Other Parts Discussed in Thread: VCA821 , VCA824 Hi team, My customer wants to find a alternative device or alternative solutions to take over AD8130ARMZ-REEL7 (Low cost Differential Receiver Amplifiers) Could you help me to find…
    • Answered

  • VCA810: VCA810

    Resolved
    Part Number: VCA810 Other Parts Discussed in Thread: VCA822 , LMH6503 , LMH6505 , VCA821 Hi, I'm using VCA810. The deviations of positive and negative cycles of the input signal are high. For ex: 1. Gain = 55.4865 (with external resistor block and VCA810…
    • Resolved

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