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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)： | 15/40頁 |
| 文件大小： | 261K |
| 代理商： | TDA8745H |
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1996 Mar 11
15
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
Table 11
Bit TEST
Table 12
Bit BB; baseband; note 1
Note
1.
The PLL demodulators can also be used for demodulating FM carriers (e.g. terrestrial TV sound) at baseband
frequencies, by changing the lock range of the PLLs.
Table 13
Bits OS1 and OS0; output select; note 1
Note
1.
The signal at both line outputs O
L
and O
R
(pins 23 and 22) can be selected with bits OS1 and OS0.
Table 14
Bit PDM; Presence Detector auto Mute; note 1
Note
1.
In both situations the status of the presence detector can be monitored by reading the bits PDL (r7) and PDR (r6)
back from the IC. Appropriate action (e.g. muting, channel selection or tuning) can then be taken by the
microcontroller. Note that this function also mutes the signal from the external inputs (pins 25 and 24). This may be
desirable when using these inputs for connecting a satellite descrambler box. If not, reset PDM (s3) to logic 0 when
selecting external [e.g. together with bits OS1 (s5) and OS0 (s4)].
TEST
s7
MODE
DESCRIPTION
0
1
(POR)
test
in applications this bit should always be logic 0, to avoid conflicts with other settings
setting TEST enables some special modes used for factory testing
BB
s6
MODE
DESCRIPTION
0
1
synthesizer
baseband
synthesizer use (PLLs central frequency approximately 10.7 MHz) (after POR)
baseband use (PLLs central frequency approximately 6 MHz)
OS1
s5
OS0
s4
MODE
DESCRIPTION
0
0
1
1
0
1
0
1
stereo (POR)
left
right
external
Left channel audio (pin 33) at O
L
; right channel audio (pin 31) at O
R
Left channel audio (pin 33) at both O
L
and O
R
Right channel audio (pin 31) at both O
L
and O
R
External left at (pin 25) at O
L
; external right (pin 24) at O
R
PDM
s3
MODE
DESCRIPTION
0
1
(POR)
PDM
if this bit is set to logic 1, a channel for which no incoming carrier is found will be muted
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