MSM7718-01 データシートの表示（PDF） - Oki Electric Industry
部品番号
コンポーネント説明
メーカー
MSM7718-01 Datasheet PDF : 38 Pages
| |||
¡ Semiconductor
MSM7718-01
(5) CR4 (Adjustment of tone generator gain)
CR4
Initial value
B7
TX TONE
GAIN3
0
B6
TX TONE
GAIN2
0
B5
TX TONE
GAIN1
0
B4
TX TONE
GAIN0
0
B3
RX TONE
GAIN3
0
B2
RX TONE
GAIN2
0
B1
RX TONE
GAIN1
0
B0
RX TONE
GAIN0
0
B7, 6, 5, 4 ...... Transmit side gain adjustment for the tone generator [ATTtgtx] (see Table 4)
B3, 2, 1, 0 ...... Receive side gain adjustment for the tone generator [ATTtgrx] (see Table 5)
Table 4 Setting of Transmit Side Gain of Tone Generator
B7 B6 B5 B4 Tone generator gain B7 B6 B5 B4 Tone generator gain
0
0
0
0
–36 dB
1
0
0
0
–20 dB
0
0
0
1
–34 dB
1
0
0
1
–18 dB
0
0
1
0
–32 dB
1
0
1
0
–16 dB
0
0
1
1
–30 dB
1
0
1
1
–14 dB
0
1
0
0
–28 dB
1
1
0
0
–12 dB
0
1
0
1
–26 dB
1
1
0
1
–10 dB
0
1
1
0
–24 dB
1
1
1
0
–8 dB
0
1
1
1
–22 dB
1
1
1
1
–6 dB
Table 5 Setting of Receive Side Gain of Tone Generator
B3 B2 B1 B0 Tone generator gain B3 B2 B1 B0 Tone generator gain
0
0
0
0
–36 dB
1
0
0
0
–20 dB
0
0
0
1
–34 dB
1
0
0
1
–18 dB
0
0
1
0
–32 dB
1
0
1
0
–16 dB
0
0
1
1
–30 dB
1
0
1
1
–14 dB
0
1
0
0
–28 dB
1
1
0
0
–12 dB
0
1
0
1
–26 dB
1
1
0
1
–10 dB
0
1
1
0
–24 dB
1
1
1
0
–8 dB
0
1
1
1
–22 dB
1
1
1
1
–6 dB
Settings of Table 5 are made in relation to the following tone levels:
DTMF tone (Low frequency group)
: –2 dBm0
DTMF tone (High frequency group) and other tone : 0 dBm0
For example, when bits B3, B2, B1, and B0 are set to “1, 1, 1, 1” (–6 dB), the PCMLNO pin outputs a
tone of the following levels:
DTMF tone (Low frequency group)
: –8 dBm0
DTMF tone (High frequency group) and other tone : –6 dBm0
The default value change command enables the gain adjustment by –1 dB step.
Writing “13CAh” into the address 00D8h adds a gain of –1 dB to the values in the above table. The
default value is “1634h”.
27/38
Share Link: 