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參數(shù)資料
| 型號(hào)： | BA3870 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | TRANS PREBIASED NPN 200MW SOT323 |
| 中文描述： | 論壇（低音系統(tǒng)）無(wú)線電錄音機(jī) |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大小： | 199K |
| 代理商： | BA3870 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
R
20
R
19
R
22
R
21
R
20
(dB)
R
21
(dB)
430
Audio ICs
BA3870
2) BBS off
When BBS is off, the signal system is as shown in
Fig. 10 due to the switches in the IC, and signal flow
is as follows.
The frequency characteristics of each block are shown
in Fig. 11, and the gains are given by the following equa-
tions:
Attenuation of ATT3: G
ATT3
= 20log
Gain of Amp D’: G
D
’ = 20log
As R
19
= R
20
and R
21
= R
22
, the total gain G
OFF
when BBS
is off is
G
OFF
= G
ATT3
G
D
’
G
OFF
= 0 (dB)
and the characteristics are flat as shown in Fig. 12
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