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參數(shù)資料
| 型號(hào)： | TDA7410NDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20 |
| 封裝： | LEAD FREE, SOP-20 |
| 文件頁數(shù)： | 11/34頁 |
| 文件大?。?/td> | 412K |
| 代理商： | TDA7410NDTR |
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TDA7410ND
Description of stereodecoder
6
Description of stereodecoder
The stereodecoder part of the TDA7410ND (see Figure 12) contains all functions necessary
to demodulate the MPX signal like pilot tone dependent MONO/STEREO switching as well
as "stereoblend" and "highcut" functions. Adaptations like programmable input gain,
selectable deemphasis time constant and a programmable fieldstrength input allow to use
different IF devices.
Figure 12.
Block diagram of the stereodecoder
6.1
Input stages
The Ingain stage allows to adjust the MPX signal to a magnitude of about 1Vrms internally
which is the recommended value. The 4th order input filter has a corner frequency of 80kHz
and is used to attenuate spikes and noise and acts as an antialiasing filter for the following
switch capacitor filters.
6.2
Demodulator
In the demodulator block the left and the right channel are separated from the MPX signal.
In this stage also the 19kHz pilot tone is cancelled.
6.3
Deemphasis and highcut
The lowpass filter for the deemphasis allows to choose between a time constant of 50
μs and
75
μs (bit D5, Stereodecoder Adjustment byte).
The highcut control range will be in both cases tHC = 2tDeemp. Inside the highcut control
range (between VHCH and VHCL) the LEVEL signal is converted into a 5 bit word which
controls the lowpass time constant between tDeemp...3tDeemp. There by the resolution will
remain always 5 bits independently of the absolute voltage range between the VHCH and
VHCL values. The highcut function can be switched off by I2C bus (bit D7, Fieldstrength
Control byte set to "0").
INGAIN
3.5 ... 11dB
STEP 2.5dB
INFILTER
LP 80KHz
4.th ORDER
DEMODULATOR
- PLOT CANC
- ROLL-OFF COMP.
- LP 25KHz
PLL +
PILOT-DET.
F19
NOISE BLANKER
F38
STEREO
HOLDN
SB CONTROL
DEEMPHASIS
+ HIGHCUT
t=50 or 75
μs
REF 5V
VSBL
LEVEL INTERN
HC
CONTROL
VHCCH
VHCCL
D
A
LEVEL INPUT
LP 2.2KHZ
1.th ORDER
LEVEL
FM_L
FM_R
MPX
100K
D05AU1614
GAIN 0..10dB
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