參數資料
型號： TEA0675T-T
廠商： NXP SEMICONDUCTORS
元件分類： 噪聲抑制
英文描述： B Type, DOLBY NOISE REDUCTION IC, PDSO24
封裝： 7.50 MM, PLASTIC, MS-013AD, SOT-137-1, SOP-24
文件頁數： 31/32頁
文件大?。?/td> 225K
代理商： TEA0675T-T
1996 Jun 07
8
Philips Semiconductors
Preliminary specication
Dual Dolby* B-type noise reduction circuit
for playback applications
TEA0675
Notes
1. In AMS off mode, pin AMSEQ is HIGH level, the equalization time constant will be switched by pulling approximately
200
A out of pin AMSEQ. This means for the device connected to pin AMSEQ, a restriction of input current at HIGH
level less than 200
A during AMS off; otherwise the selection of the equalization time constant is disabled and fixed
at 120
s. If the connected devices consume more than 200 A, this input has to be disconnected in AMS off mode.
(To ensure switching, the currents for the different switched modes are specified with a tolerance of
±50 A in
Chapter “Characteristics”.) For an application with a fixed EQ time constant of 120
s the equalizing network may be
applied completely external. Change 8.2 k
resistor to 14 k the internal resistor REQ = 5.8 k is short-circuited by
fixing the EQ switch input at the 70
s position (IEQ70).
2. The high speed of the tape (FF, REW) at the tape head during AMS mode causes a transformation of level and
frequency of the originally recorded signal. It means a boost of signal level of approximately 10 dB and more for
recorded frequencies from 500 Hz up to 4 kHz. So the threshold level of
22 dB corresponds to signal levels in Play
Back (PB) mode of approximately
32 dB. The AMS inputs for each channel are pin SCA and pin SCB. As the
frequency spectrum is transformed by a factor of approximately 10 to 30 due to the higher tape speed in FF, REW,
the high-pass filter (4.7 nF/24 k
) removes the effect of offset voltages but does not affect the music search function.
In the application circuit (Fig.1) the frequency response of the system between tape heads input, e.g. pins INA2 and
INB2, to the AMS input pins SCA and SCB is constant over the whole frequency range (see Fig.3).
3. To activate the inputs IN1, pin HS might be left open-circuit. In this event the DC level at pin HS is 0.775VCC.
AP/M
signal level at output for
AMS switching
pause to music
AMS mode; f = 10 kHz;
24
21
18
dB
EQ switch input (not AMS mode)
IEQ70
input current
time constant 70
s active
150
A
IEQ120
input voltage
time constant 120
s active 1000
250
A
IEQth
threshold current
note 1
200
A
HEAD SWITCHING
VHSW
pin voltage
load current +90 to
90 A
0.8VCC
V
IHSW
input current
VHSW =0toVCC
170
+170
A
VHSW(HIGH)
HIGH level pin voltage
inputs INA1 and INB1
active; note 3
1
2VCC + 0.5
VCC
V
VHSW(LOW)
LOW level pin voltage
inputs INA2 and INB2
active
0
1
2VCC 0.5 V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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