Shifting and Scaling [0V / +15V] input to meet ADS1675REF requirements

mariano rotunno

Other Parts Discussed in Thread: ADS1675

Hi all,

i need to translate a (0,+15V) analog input to the range accepted by ADS1675REF board.

I've seen that the common mode voltage for this board is 2.5V and the ADS1675 input range is ±Vref so from datasheet i suppose is ±3V.

If i am right all this drives to an input that must lie inside a [2.5-3, 2.5+3] so finally i have to scale (0,+15) to (-0.5V, 5.5V) isn't it?

Any suggestion about circuit to realize this?

Thanks in advance

0 Avi Chami1 over 12 years ago

Please read again the eval board user guide, the board includes a preamplifier that gives an analog input range of +- 6.5V.

best regards,

Avi

0 Bruce Bailey over 12 years ago

Mariano,

The +/- 3 input range is centered on a 2.5 V common mode voltage ... so the actual voltage is 1 V to 4 V relative to AGND.

Cheers,

Bruce

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