Part Number: VCA822 For the VCA822 variable gain amplifier datasheet (on page 34, figure 91) there is mention of a couple offset nulling circuits. Shown are a couple 0.1uF caps shown for decoupling purposes. Is this value ok for lower frequencies? As…
Part Number: VCA822 Tool/software: Hello,
I'm designing a board where a same signal is amplified by two identical and redundant VCA822 amplifiers. G = 10, Rf = 1k, Rg = 200R The outputs of these amplifiers are then compared. I'm using the range -0.8V…
Part Number: VCA822 Hi, I'm using VCA822 with cascade structure. Therefore, I could not give the right results of the simulations. With this structure below,
After U1, Instead of 1V, I get 724.8 mV as seen below.
After U2, I must get 2V if input…
Part Number: VCA822 I want to design programmable gain block with VCA822. The IC has 100V/V gain range but at simulation, the recommended resistor values for 100V/V (Rf = 845 ohm, Rg = 16.9 ohm) do not provide 100V/V at VG = 1V. The result has big offset…
Part Number: VCA822 Other Parts Discussed in Thread: TINA-TI Hello,
I'm using VCA822 into an AGC system in the configuration of Gmax = 10 (Rf = 1K, Rg =200) from a single-ended source.
VCA822 has quite big bandwidth (> 100MHz), and i need to filter…
Part Number: VCA822 Hi,
I'm implementing a Voltage Controlled Amp using a VCA822. I have got two ICs, each time I connect and power them up to +/- 5V and GND the ICs over-heat to the point I am afraid they will be destroyed. There is no mention of any…
Part Number: VCA822 Other Parts Discussed in Thread: VCA820 , , LMH6502 , LMH6503 Hi
On the datasheet, it is defined as the below.
And,
The maximum operating voltage is not defined. However, VCA820 it is defined as +/-6V on the datasheet,
…
Hello Monse,
As Loren suggested I believe you are running into headroom issues on the output because of the large 12.7k resistor. The typical bias current of the VCA822 is 19uA. The input voltage (@ dc) at pin 2 is then 19uA*12.7kOhm = 241mV. This is…
