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參數(shù)資料
| 型號： | TDA7338D |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 通用總線功能 |
| 英文描述： | STEREO DECODER |
| 中文描述： | 立體聲解碼器 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 103K |
| 代理商： | TDA7338D |
FUNCTIONAL DESCRIPTION
Signal Path
The TDA7338 Stereodecoder contains all neces-
sary functionsfor processing the MPX signal. Due
to the external input resistance (Pin 20) the circuit
can be adapted to different MPX input levels. Be-
hind a 80kHz lowpass filter the adjustment free
PLL for the pilotTone is placed.The only external
component needed for the PLL is the ceramic
resonatorfor the oscillator which runs at 456kHz.
The pilot detector output is designed as an open
collector output, therefore an external pullup re-
sistor is needed. To force the decoder to ”MONO”
Pin 19 has to be clamped to a voltage below
0.8V.
The voltagelevel (signalstrength from the IFpart)
applied to Pin 15 (VHCC) allows to control the
time constant of the deemphasis (nom. = 50
μ
s,
see fig. 1). If the RF-signal is weak, the corner
NOTES TO THE CHZARACTERISTICS
(continued)
4. ACI (ADJACENT CHANNEL INTERFERENCE)
α
114
=
V
O
(
signal
)
(
at
1
KHz
)
V
O
(
spurious
) (
at
4
KHZ
)
; f
s
= 110KHz- (3 x 38KHz)
α
190
=
V
O
(
signal
)
(
at
1
KHz
)
V
O
(
spurious
) (
at
4
KHZ
)
; f
s
= 186KHz- (5 x 38KHz)
measuredwith : 90% mono signal; 9% pilot signal; fm=1KHz; 1% spurioussignal
(f
s
= 110KHzor 186KHz,unmodulated)
5. Controlrange typ 11% of V
R
(see figure1 and figure2)
6. MEASUREMENTOF TRIGGERTHRESHOLDS
All thresholdsare measured by using a pulse
with T
R
= 2
μ
s, T
HIGH
= 2
μ
s, andT
F
= 10
μ
s.
The repetitionrate must not increasethe PEAK
voltage.
VTR
Vin
DC
TR
THIGH
TF
Time
D95AU365
-0.5
-0.4
-0.3
-0.2
-0.1
0.0 V
HCC
-V
R
(V)
0
1
2
3.18
(=50
μ
s)
f
c
(KHz)
VR
=3.6V
D95AU366
Figure 1:
High Cut Control
-0.40
-0.32
-0.24
-0.16
-0.08 V
SB
-V
R
(V)
0
10
20
30
40
50
SEP
(dB)
V
R
=3.6V
D95AU367
Figure2:
Stereo Blend
TDA7338
5/11
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| 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 |
| TDA7339 | 功能描述:音頻 DSP Digital Audio Proc RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TDA7340 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AUDIO SIGNAL PROCESSOR |
| TDA7340G | 功能描述:音頻 DSP Audio Signal Proc RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TDA7340P | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AUDIO SIGNAL PROCESSOR |
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