PCM1803A

rk39300

Other Parts Discussed in Thread: PCM1803A

What is the input voltage range of the PCM1803A ? I can't find the info in the data sheet. I want to use the PCM1803A in a data logger project.

Thx

over 15 years ago

0 Cristian Dolha over 15 years ago

Prodigy 80 points

Datasheet, page 5 (Electrical characteristics, continued)

Second section (Analog input)

Vi - Input voltage = 0.6 Vcc (p-p)

So if you're supplying the chip with 5V on the Vcc, then input voltage will be 0.6 x 5V = 3V peak-to-peak, and that's 1.5V peak, which is further 1.05Vrms

0 rk39300 over 15 years ago in reply to Cristian Dolha

Prodigy 175 points

Thx for the response. Is the .6 Vcc (p-p) centered around Vcc/2 ? or is it from 0 to .6 Vcc ?

0 Brian Burk over 15 years ago in reply to rk39300

TI__Genius 9680 points

Rk,

With Vcc = 5V

Vcenter = 5V * 0.5 = 2.5V
Vpeak-to-peak = 5V * 0.6 = 3V
Vamplitude = 3V / 2 = 1.5V

Since the input wave is offset by 2.5V, the top or peak of the wave will be at 2.5V + Vamplitude (1.5V) = 4V and the bottom will be 2.5V - 1.5V = 1V.

Thanks,
Brian

0 rk39300 over 15 years ago in reply to Brian Burk

Prodigy 175 points

Thx a lot

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PCM1803A