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參數(shù)資料
| 型號： | TDA9874H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Digital TV sound demodulator/decoder |
| 中文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44 |
| 文件頁數(shù)： | 41/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
41
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
8
I
2
S-BUS DESCRIPTION
The digital audio interface of the TDA9874H consists of a
serial audio output and associated clock signals. It can be
used to supply digital audio signals from received
TV programs to a suitable output device, e.g. a DAC or an
AES/EBU transmitter.
Two serial audio formats are supported at the digital audio
interface, i.e. the I
2
S-bus format and a very similar
MSB-aligned format. The difference is explained in Fig.6.
In both formats the left audio channel of a stereo sample
pair is output first, and is on the Serial Data line (SDO)
when the Word Select line (WS) is LOW. Data is written
with the trailing edge of SCK and read with the leading
edge of SCK. The most significant bit is sent first.
At power-up, the outputs of the digital audio interface are
3-stated to reduce EMC and allow for combinations with
other ICs. If output is desired, it has to be activated by
means of an I
2
C-bus command.
When output is enabled, serial audio data can be taken
from pin SDO. Depending on the signal source, switch and
matrix positions, the output can be either mono, stereo or
dual language.
The Word Select output (WS) is clocked with the audio
sample frequency of 32 kHz. The Serial Clock output
(SCK) is clocked at a frequency of 2.048 MHz. This
means, that there are 64 clock pulses per pair of stereo
output samples, or 32 clock pulses per sample. There are
18 significant bits used on the Serial Data Output (SDO).
A symmetrical system clock output (SYSCLK) is available
from the TDA9874H as a master clock for external digital
audio devices. At power-up, the clock is off. It can be
enabled and the output frequency set via an I
2
C-bus
command. Available output frequencies are 8.192 MHz,
12.288 MHz, 16.384 MHz and 24.576 MHz.
Fig.6 Serial audio interface formats.
handbook, full pagewidth
MGK759
one sample
WS
SDO
LSB
MSB
LSB
MSB
a. MSB-aligned format.
b. I
2
S-bus format.
handbook, full pagewidth
MGK758
one sample
WS
SDO
LSB
MSB
LSB
MSB
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