SAE 800
Logic
The logic unit contains the complete sequence control. The oscillator produces the power-on reset
and the clock frequency. Single-tone, dual-tone or triple-tone operation is programmed on inputs
E1 and E2. The 4-bit digital/analog converters are driven in parallel. In the event of oscillator
disturbance, and after the sequence, the dominant stop output is set. By applying current to pin L,
the sequence can be shortened by a factor of 30 for test purposes.
The following figure shows the envelope of the triple-tone sequence:
Envelope of maximum amplitudes of three
superimposed tones on Q (time scale for
f
OSC
= 13.2 kHz)
Ratio of maximum amplitudes
M3 : M2 : M1 = 1 : 0.89 : 0.67
Envelope of the Triple-Tone Sequence
Semiconductor Group
5
SIEMENS [ Siemens Semiconductor Group ]
