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  • VCA821: Alternative product to VCA821 with digital control

    Resolved
    Part Number: VCA821 Other Parts Discussed in Thread: LMH6518 , LMH6881 Hi team, My customer is considering alternative device to VCA821 that can adjust the gain from the digital signal. I searched TI.com and found out LMH6518. But LMH6518's slew rate…
    • Resolved

  • VCA821: Do VCA821 on the EVM meet RoHS?

    TI Thinks Resolved
    Part Number: VCA821 Hi Team, Is there any difference between the VCA821 on the EVM and the VCA821 on the official website? Do they all meet RoHS? Thanks. Regards, Charlie

  • VCA821: Differential input voltage level

    Part Number: VCA821 Hello team, The D/S Table 2 specifies that RG = 18Ohm when G=40 (use case is AVMAX=32dB). Figure 1 specifies that differential input voltage level should be close to 0.1Vpp when RG=18Ohm. Is the input voltage level limited to 0.1Vpp…

  • RE: VCA821: VCA821 Rg and Rf VS gain

    Hi Jacob, Thank you for your response here. I have tried VCA821/VCA820, these two device can not realize the function I mentioned here. Does TI do not have such VCA to realize below requirement? Vs=+/-5V, Vppmax=2V, frequency=30MHz, AVmax=40dB; When…

  • 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.

  • 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

  • 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 output…
    • 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 V…
    • Resolved

  • 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 a square wave…
    • 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

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