參數(shù)資料
型號： TDA7335
廠商： STMICROELECTRONICS
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDIP30
封裝： 0.400 INCH, SDIP-30
文件頁數(shù)： 19/20頁
文件大?。?/td> 3456K
代理商： TDA7335
c)From now on where the sum input signal (left-
right) amplified by the limiter exceeds the sig-
nal detector threshold (3) the capacitor C7 is
forced to charge. When the voltage across
this
capacitor
reaches
the
comparator
COMP1 threshold voltage Vth1 (approx. 2 Vbe)
FF1 is set and FF2 is reset. (4) It follows that
Q1 is turned on discharging the program de-
tection capacitor (C7).
d)Always when there is a recorded zone, Q1 is
on; it becomes off only if a blank section is
reached. When, with a time constant control-
led by the R9, C9 network the voltage at
space detection time pin reaches Vth2 thresh-
old (comparator COMP2) a true blank section
is detected and the FF2 is set. (The minimum
charging time is approximately given by:
0.69 x C9 x R9 [sec]
In this condition Q2 is ON, forcing the open
collector AMS output to go LOW, informing
the user that a true blank section has been
detected. The state is then able to start from
the above point c). Figures 3-4 show the sig-
nal behaviour.
The device is able to prevent false interspace de-
tection and the end of the tape. (see Fig. 4).
Note:
(3): minimum RMS input signal is given by:
Vin
= AMSVth
=
1K
+ R8
101K
+ R8
0.6
where Vin is the mean of left and right channels:
Vin
=
Vright
+ Vleft
2
(4): the charging current at pin 9 is about 20
A
(half input signal) so program detection time
constant is given by:
C7 x 2Vbe
20
A =
70 x C7 [
F]
= [msec]
It is recommended to insert a resistor (R7) high
enough to prevent fast C7 capacitor discharging.
AMS Gin
RB
0.22
F
C8
IN-L
21
1K
100K
Rp21
R9
+
Vs
6
25
IN-R
LIMITER
AMPLIFIER
Vth0
-
+
SIGNAL DETECT.
COMPARATOR
Vs
POWER-ON
RESET
AMS th
NOR1
Q1
Vth1
-
+
22
AMS OUT
Q
FF2
S
R
-
+
COMP1
COMP2
Vth2
Q2
Q
FF1
R
S
Q
0.1
F
C7
R7
500K
PROGRAM
DETECTION TIME
T2
T1
C15
C9
R9
SPACE
DETECTION
TIME
Vs
INTS
AMS SW
INTP
23
9
D93AU098
10
8
Figure 2: Audio Music Sensor
TDA7335
8/20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7336 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STEREO PREAMP+ AMS+ DOLBY B* NOISE REDUCTION PROCESSOR
TDA7338 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STEREO DECODER
TDA7338_05 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STEREO DECODER
TDA7338D 功能描述:接口—CODEC Stereo Decoder RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TDA7338D013TR 功能描述:接口—CODEC Stereo Decoder RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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