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參數(shù)資料
| 型號(hào)： | 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)： | 16/56頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TDA9874H |
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1998 Apr 27
16
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874H
7
I
2
C-BUS CONTROL
7.1
Introduction
The TDA9874H is controlled only via the I
2
C-bus. Control
is exercised by writing data to one or more internal
registers. Status information can be read from an array of
registers to let the controlling microprocessor determine
whether any action is required.
The device has an I
2
C-bus slave transceiver in
accordance with the fast-mode specification with a
maximum speed of 400 kbits/s. Information about the
I
2
C-bus can be found in brochure “I
2
C-bus and how to use
it”(order number 9398 393 40011). To avoid conflicts in a
real application with other ICs providing similar or
complementing functions, there are four possible slave
addresses available, which can be selected by pins
ADDR1 and ADDR2 (see Table 7).
Table 7
Possible slave addresses
The I
2
C-bus interface remains operational in the Standby
mode of the TDA9874H to allow the device to be
reactivated via the I
2
C-bus.
The device will not respond to a ‘general call’ on the
I
2
C-bus, i.e. when a slave address of 0000000 is sent by a
master.
ADDR2
ADDR1
SLAVE ADDRESS
A6
A5
A4
A3
A2
A1
A0
0
0
1
1
0
1
0
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
7.2
Power-up state
At power-up the device is in the following state:
All outputs muted
No sound carrier frequency loaded
General purpose I/O pins ready for input (HIGH)
Input SIF1 selected with:
– AGC on
– Small hysteresis.
Demodulators for both sound carriers set to FM with:
– Identification for B/G, D/K, identification mode ‘slow’
– Level adjust set to 0 dB
– De-emphasis 50
μ
s
– Dematrix set to mono
– Adaptive de-emphasis on.
OUTL and OUTR set to mono and connected to DAC
Digital audio interface all outputs off
Monitor set to carrier 1 DC output.
After power-up a device initialization has to be performed
via the I
2
C-bus to put the TDA9874H into the proper mode
of operation, in accordance with the desired TV standard,
etc. This can be done by writing to all registers with a
single I
2
C-bus transmission (like a refresh operation) or by
writing selectively only to those registers, the contents of
which need to be changed with regard to the power-up
state.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
| 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 |
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