Part Number: VCA820 Hi team,
I want to use this device as below, Rf=845Ohm, Rg=16.9, Vg=2V, which means Avmax=40dB;
When I apply VG1 signal, Vpp=5mV, f=20MHz, we can see that Vpp of VF1 is about 700mV. This is not aligned with the gain*Vpp=500mV. What…
Part Number: VCA820 I am looking for a VGA 10MHz , with -10 to +10 db gain operating with a single supply and single ended. Can VCA820 b e used with single power supply 10VDC? or can you suggest an alternative part number
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
Hello Amy,
I have not forgotten about getting a good explanation to you; I am working with my manager to best understand how to communicate the selection of AGC parameters.
While I am working on this, please see this thread for more information: https…
Hello Hirano-San,
The input signal into the LMH6505 would be within range; however, there might be an issue into the following stages (within the AGC loop control) due to the DC offset cancellation. I am looking into this a bit more.
Also, we have other…
Other Parts Discussed in Thread: VCA820 , TINA-TI Dear all
My customer is evaluating VCA820, they will provide a high frequency voltage(around 30MHz or even higher) to VCA820, so they want to know how long it will take for the VCA820 to change its gain…
Hi Wael,
your input signal range is way too large for a simple AGC circuit. I think you will need two cascaded VCA820 with additional signal dampening to do the job:
wael_vca820.TSC
R1/R10 and R11/R12 attenuate the input signal to provide input stage…
Part Number: LMH6503 Other Parts Discussed in Thread: VCA822 , VCA820 , VCA824 Hello, on page 19 of LMH6503 daatasheet, Figure 61 shows how to adjust (on pin 12) the output offset of the LMH6503 IC. Can this adjustment be useful to adjust the offset from…
Other Parts Discussed in Thread: VCA821 , VCA820 , VCA822 , VCA824 Hallo,
I have a question. What are VCTRL0 and VSLOPE in the VCA820 / VCA821 datasheet and Figure7 of the VCA821 datasheet? The VCA822 / VCA824 have not these specs. Are these specs for the gain…
Other Parts Discussed in Thread: VCA822 , LMH6505 , VCA820 , OPA820 What happens with the VCA820 or VCA822 if the Gain Control (Vg) voltage falls out of the normal operating range of 0V to 2V (For VCA820) and -1V to 1V (For VCA822)? The LMH6505 warns against…