IC-NQL Datasheet, PDF (13/24 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH SSI INTERFACE

iC-NQL
13-bit Sin/D CONVERTER WITH SSI INTERFACE
MAXIMUM POSSIBLE CONVERTER FREQUENCY
Rev B1, Page 13/24
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.
feature can be enabled via the FCTR register. Should
the input frequency exceed the frequency limit of the
selected converter resolution, the LSB is kept stable
and not resolved any further; the interpolation resolu-
tion halves.
Serial data output
For SSI output the maximum possible converter fre-
quency can be adjusted to suit the maximum input fre-
quency; an automatic converter resolution step-down
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 frequency
FCTR Min. Res. bin dec SSI
finmax
0x0004
XXX
f(OSC)min / 40 / Resolution –
0x4102 ≥ 8
XXX
f(OSC)min / 24 / Resolution Rel. angle error 2x increased
0x4202 ≥ 16
XXX
2 x f(OSC)min / 24 / Res. Rel. angle error 4x increased
0x4304 ≥ 32
XXX
4 x f(OSC)min / 40 / Res. Rel. angle error 8x increased
0x4602 ≥ 64
X- X
4 x f(OSC)min / 24 / Res. Resolution lowered by factor of 2
0x4A02 ≥ 128
X- X
8 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-4
0x4E02 ≥ 256
X- X
16 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-8
0x5202 ≥ 512
X- X
32 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-16
0x5602 ≥ 1024 X - X
64 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-32
0x5A02 ≥ 2048 X - X
128 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-64
0x5E02 ≥ 4096 X - X
256 x f(OSC)min / 24 / Res. Res. lowered by factor of 2-128
0x6202 8192
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*
finmax [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.