SM8230A_06 Datasheet, PDF (7/8 Pages) NEC – Tone Dialer with Built-in Piezo Driver

SM8230A
GH/GL command (GH3 to GH0, GL3 to GL0)
These bits set the output levels of the high-frequency group and low-frequency group outputs, respectively. The
input code and the corresponding output level are shown in table 4. Note that the 0dB point is typically 93% of
the supply voltage. Any value above 0dB results in amplitude clipping of the output waveform.
Table 4. GH/GL command
GH3/GL3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
GH2/GL2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
GH1/GL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
GH0/GL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Output level
−9dB
−8dB
−7dB
−6dB
−5dB
−4dB
−3dB
−2dB
−1dB
0dB
1dB
2dB
3dB
4dB
5dB
6dB
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