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Showing 38 results View by: Thread Post Sort by
    Answered
  • VCA821: Alternative product to VCA821 with digital control

    Taito Takemura
    Taito Takemura
    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
    • 4 months ago
    • Amplifiers
    • Amplifiers forum
  • VCA821: Do VCA821 on the EVM meet RoHS?

    Charlie Xiao
    Charlie Xiao
    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
    • 5 months ago
    • Amplifiers
    • Amplifiers forum
  • VCA821: Differential input voltage level

    Kazuki Itoh
    Kazuki Itoh
    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…
    • over 2 years ago
    • Amplifiers
    • Amplifiers forum
  • RE: VCA821: VCA821 Rg and Rf VS gain

    Lin_Charles
    Lin_Charles
    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…
    • over 3 years ago
    • Amplifiers
    • Amplifiers forum
  • VCA821:I think there is something wrong in the picture of datasheet, Is there someone who have succeed simulating the circuit of this picture?

    wen Zhang
    wen Zhang
    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.
    • over 2 years ago
    • Amplifiers
    • Amplifiers forum
  • 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...

    Hasan Babiker31
    Hasan Babiker31
    Closing this thread as it is being addressed here: Best, Hasan Babiker
    • over 2 years ago
    • Amplifiers
    • Amplifiers forum
  • VCA821: the Bottom of my VCA821 output waveform has distortion

    Darren Xu
    Darren Xu
    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…
    • over 5 years ago
    • Amplifiers
    • Amplifiers forum
  • Answered
  • LMH6505: AGC circuits at V+/V- = 7V/0V

    Kazuhiko Hirano
    Kazuhiko Hirano
    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
    • 6 months ago
    • Amplifiers
    • Amplifiers forum
  • Cascading OPA847 and VCA821

    Paul Law49
    Paul Law49
    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…
    • over 6 years ago
    • Amplifiers
    • Amplifiers forum
  • Answered
  • vca821 Vout(pp) vs max gain adj range

    duuk lee
    duuk lee
    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
    • over 7 years ago
    • Amplifiers
    • Amplifiers forum
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