IC-NQ Datasheet, PDF (13/25 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH CALIBRATION

iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
MAXIMUM POSSIBLE CONVERTER FREQUENCY
Rev D1, Page 13/25
The converter frequency automatically adjusts to the
value necessary for the input frequency and resolution.
This value ranges from zero to a maximum dependent
on the oscillator frequency which can be set using reg-
ister FCTR.
tion step-down feature can be enabled via the FCTR
register. Should the input frequency exceed the fre-
quency limit of the selected converter resolution, the
LSB is kept stable and not resolved any further; the
interpolation resolution halves.
Serial data output
For BiSS or SSI output the maximum possible con-
verter frequency can be adjusted to suit the maxi-
mum input frequency; an automatic converter resolu-
If the next frequency limit is overshot, the LSB and the
LSB+1 are kept stable and so on. When the input fre-
quency again sinks below this frequency limit, the fine
resolution automatically returns.
Max. Possible Converter Frequency For Serial Data Output
Resolution
Protocol Max. Input Frequency
Restrictions
Requirements
at high input frequencies
FCTR Min. Res. bin dec BiSS SSI fin_max
0x0004
X X X X f(OSC)min / 40 / Resolution –
0x4102 ≥ 8
X X X X f(OSC)min / 24 / Resolution Rel. angle error 2x increased
0x4202 ≥ 16
X X X X 2 x f(OSC)min / 24 / Res. Rel. angle error 4x increased
0x4304 ≥ 32
X X X X 4 x f(OSC)min / 40 / Res. Rel. angle error 8x increased
0x4602 ≥ 64
X - X X 4 x f(OSC)min / 24 / Res. Resolution lowered by factor of 2
0x4A02 ≥ 128
X - X X 8 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-4
0x4E02 ≥ 256
X - X X 16 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-8
0x5202 ≥ 512
X - X X 32 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-16
0x5602 ≥ 1024 X - X X 64 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-32
0x5A02 ≥ 2048 X - X X 128 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-64
0x5E02 ≥ 4096 X - X X 256 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-128
0x6202 8192
X - X X 512 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-256
Notes *) Calculated with fosc()min taken from Electrical Characteristics item A01.
Examples*
fin_max [kHz] at resol.
8192 1024 200
0.16 1.27 6.5
0.26 2.1 10.8
0.53 4.2 21.6
0.64 5.1 26.0
1.1 8.5 -
2.1 16.9 -
4.2 33.8 -
8.5 67.7 -
16.9 135 -
33.8 250 -
67.7 -
-
135 -
-
Table 14: Maximum converter frequency for serial data output.