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參數(shù)資料
| 型號(hào)： | TDA9875 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Digital TV Sound Processor DTVSP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| 文件頁數(shù)： | 83/92頁 |
| 文件大?。?/td> | 279K |
| 代理商： | TDA9875 |
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1998 Feb 13
83
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
As the coefficients do not fit into one data byte, they have to be split and arranged (see Table 112). The most significant
bit is transferred first.
Table 112
General format (notes 1, 2 and 3)
Notes
1.
2.
3.
X = don’t care.
MST = most significant third.
LST = least significant third.
The general format described in Table 112 shows the minimum number of data bytes required, i.e. two bytes for the
transfer of a single coefficient.
Should more than one coefficient be sent, then the CRAM address will be automatically incremented after each
coefficient, resulting in writing the sequence of coefficients into successive memory locations, starting at
CRAM ADDRESS. A transmission can start with any valid CRAM address. If two coefficients are to be transferred, they
are arranged as shown in Table 113.
Table 113
Transfer of two coefficients
BYTE
DATA
DESCRIPTION
1. data byte
2. data byte
a
a
a
a
a
a
a
a
a
X
a
X
a
X
a
X
2 MST of 1st coefficient
1 LST of 1st coefficient
BYTE
DATA
DESCRIPTION
1 data byte
2 data byte
3 data byte
a
a
b
a
a
b
a
a
b
a
a
b
a
b
b
a
b
b
a
b
b
a
b
b
2 MST of 1st coefficient
1 LST of 1st coefficient + 1 MST of 2nd coefficient
2 LST of 2nd coefficient
With any odd number of coefficients to be transferred, the
least significant nibble of the last byte is regarded as
containing don’t care data.
As the transfer of coefficients cannot be accomplished
within one audio sample period, it is necessary that
received coefficients be buffered and made active all at
the same time to avoid audio signal transients. The
receive buffer is designed to store up to 8 coefficients in
addition to the CRAM address. Each byte that fits into the
buffer is acknowledged with ACK (acknowledge). If an
attempt is made to write more coefficients than the buffer
can store, the device acknowledges with NACK (not
acknowledge) and any further coefficients are ignored.
Coefficients that are already in the receive buffer remain
intact.
An expert mode transfers ends when the I
2
C-bus STOP
condition or a repeated START condition has been
detected. Only those coefficients that have been received
during the last transmission will then be copied from the
buffer to the CRAM.
To make efficient and correct use of the expert mode, it is
recommended to transfer all coefficients for any one
function in a single transmission.
There is no checking of memory addresses and the
automatic incrementing of addresses does not stop at the
highest used CRAM address. The user of this expert
mode must be fully acquainted with the relevant
procedures.
More information concerning the functions of this device,
such as filter structures, the number of coefficients per
function, their default values, memory addresses, etc.,
can be supplied on request at a later date.
11 I
2
S-BUS DESCRIPTION
The feature interface of the TDA9875 contains two serial
audio inputs and outputs and associated clock signals.
It can be used to supply, for example, audio signals from
received TV programs to a digital audio output device
(AES/EBU format), or import serial audio signals from
other sources for reproduction through the TV set’s
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9875A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| TDA9875AH/V2,557 | 功能描述:IC SOUND PROC DGTL TV 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| TDA9880 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Alignment-free multistandard vision and FM sound IF-PLL demodulator |
| TDA9880T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Alignment-free multistandard vision and FM sound IF-PLL demodulator |
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