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參數(shù)資料
| 型號： | TDA8745H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Satellite sound receiver with I2C-bus control |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 文件頁數(shù)： | 17/40頁 |
| 文件大小： | 261K |
| 代理商： | TDA8745H |
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1996 Mar 11
17
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
Table 17
Bits LEV3 to LEV0; level adjust; note 1
Notes
1.
The audio level can be adjusted in steps of 1 dB, to adjust for different FM deviations used in main channel audio
carriers and/or spread in PLL output amplitude. With secondary carriers the Noise Reduction (NR) is to be used with
the 0 dB setting (note that the NR audio frequency response is level dependent, therefore another setting than 0 dB
is only to be used when making a fine-adjustment (+2 dB/
2 dB) for PLL spread. Typical setting for main channel
carriers is in most cases 85 kHz (0 dB) or 76 kHz (+1 dB).
Maximum deviation.
Situation after POR.
2.
3.
Table 18
Bit NR; Noise Reduction; note 1
Note
1.
For reception of main channel carriers the NR circuit can be bypassed.
LEV3
a7
LEV2
a6
LEV1
a5
LEV0
a4
MODE
SECONDARY
CHANNELS
(2)
(kHz)
MAIN CHANNEL
(2)
(kHz)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
12 dB
11 dB
10 dB
9 dB
8 dB
7 dB
6 dB
5 dB
4 dB
3 dB
2 dB
1 dB
0 dB
+1 dB
+2 dB
+3 dB
199
177
158
141
126
112
100
89
79
71
63
56
50
(3)
45
40
35
338
302
269
240
214
190
170
151
135
120
107
95
85
(3)
76
68
60
NR
a3
MODE
DESCRIPTION
0
1
NR bypassed Noise Reduction bypassed (main channel)
NR active
Noise Reduction active (secondary channels) (after POR)
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