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)： 18/20頁
文件大小： 3456K
代理商： TDA7335
AUDIO MUSIC SENSOR (See Figure 2)
Aim of this section is to detect interprogram
spaces present on a recorded tape.
Both the blanks (interprogram spaces) and the
programs minimum detectable durations can be
easily set by means of 2 external and inde-
pendent time constants.
Also the minimum detectable input signal level
can be externally adjusted, by a dedicated gain
network.
Main blocks are:
Variable gain limiter amplifier
Signal detector circuitry
Logic blocks able to avoid unproper operations.
Operations Description (refer to the simplified
schematic of Figure 2).
a)The two channels left and right mean signal
coming from the preamp chain (AC coupled)
are added (current) at the AMS input and pre-
sented to the limiter amplifier. The limiter am-
plifier gain is internally fixed to 40dB, and it
could be reduced by the R8 external resistor.
The AMSVth threshold is fixed at 1V. The fol-
lowing signal detector comparator informs of
the presence of music signal (High level out)
and avoids the erroneous detection of very
low signal (like noise) as real program.
b)The system moves in blank detection mode
everytime the supply is turned on or, with
power supplied, the AMS On/Off pin (to be
driven by an open collector output) is turned
off (T1 open). Once this condition has hap-
pened, the capacitor C15 charges, defining a
minimum reset time, long enough to reset the
Flip-Flops FF1 and FF2 and to descharge the
program detector external C7 capacitor. The
charging current at the AMS SW pin is about
10
A. It follows that the reset time (C15 x
Vpin8)/IC15 is given approximately by 0.122 x
C15 ns where C15 is in
F.
ELECTRICAL CHARACTERISTICS (continued)
DOLBY SECTION
Symbol
Parameter
Test Condition
DOLBY
Min.
Typ.
Max.
Unit
RDO
Dolby Output Impedance
(pin 13, 18)
100
200
300
S/H
Signal Handling
VS = 8V; THD = 1%
OFF
12
13
dB
B DEC 1
Decode Out
f = 10KHz; VI = 0.4dB
ON
-1.5
0
1.5
dB
B DEC 2
Decode Out
f = 500Hz; VI = -22.1dB
ON
-26.5
-25
-23.5
dB
B DEC 3
Decode Out
f = 2KHz; VI = -18dB
ON
-26.5
-25
-23.5
dB
B DEC 4
Decode Out
f = 5KHz; VI = -29.7dB
ON
-41.5
-40
-38.5
dB
B DEC 5
Decode Out
f = 10KHz; VI = -29.6dB
ON
-41.5
-40
-38.5
dB
NRl
Dolby ON Low Level Pin 20
0
0.8
V
NRh
Dolby OFF High Level Pin 20
2
VS
V
GENERAL (PREAMPLIFIER + DOLBY)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
THD
Total Harmonic Dist.
VO = 0dB; f = 1KHz Dolby OFF
0.02
0.1
%
VO = 0dB; f = 1KHz Dolby ON
0.05
0.1
%
VO = 0dB; f = 10KHz Dolby OFF
0.03
%
VO = 0dB; f = 10KHz Dolby ON
0.08
%
S/N
Signal to Noise Ratio
Rg = 600
; VO = 0dB;
Unweighted; Dolby OFF
63
dB
Rg = 600
; VO = 0dB;
Unweighted; Dolby ON
70
dB
Rg = 600
; VO = 0dB;
CCIR/ARM; Dolby OFF
54
63
dB
Rg = 600
; VO = 0dB;
CCIR/ARM; Dolby ON
56
72
dB
CS
Channel Separation
Rg = 600
; f = 1KHz Dolby OFF
50
64
dB
Rg = 600
; f = 1KHz Dolby ON
70
dB
CT
Channel Cross Talk
Rg = 600
; f = 1KHz Dolby OFF
56
70
dB
Rg = 600
; f = 1KHz Dolby ON
75
dB
TDA7335
7/20
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相關代理商/技術參數(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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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