Elmo DBP SERIES R201 = 5.92 x 107 / T x p, Kohm, where p = bit per rev, fref 10 x fbw, 2.5x109

91

R201 = 5.92 x 107 / T x p (Kohm)

where p = bit per rev

=1,024 for 10 bits resolution

=4,096 for 12 bits

=16,384 for 14 bits

=65,536 for 16 bits

Closed Loop Bandwidth Selection (C67, C68, R200)

a. Choose the Closed Loop 3dB Bandwidth (f bw) required ensuring that

fref > 10 x fbw

Recommended bandwidth values: 250Hz for 3KHz

300Hz for 5KHz 500Hz for 10KHz

b. Select C67 so that

2.5x109
C67 = -------------	(pF)
2
R201 x fbw

with R201 in Kohm and fbw in Hz as selected above.

c. C68 is given by

C68 = 40 x C67 (pF)

DBP - Rev 6/93