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參數(shù)資料
| 型號： | TDA7338D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 541K |
| 代理商： | TDA7338D |
5/12
TDA7338
3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION)
; fs = (2 x 38KHz) - 67KHz
measured with : 81% mono signal; 9% pilot signal; fm=1KHz;
10% SCA - subcarrier (fs = 67KHz, unmodulated)
4. ACI (ADJACENT CHANNEL INTERFERENCE)
; fs = 110KHz - (3 x 38KHz)
; fs = 186KHz - (5 x 38KHz)
measured with : 90% mono signal; 9% pilot signal; fm=1KHz; 1% spurious signal
(fs = 110KHz or 186KHz, unmodulated)
5. Control range typ 11% of VR (see figure 5 and figure 6)
6. MEASUREMENT OF TRIGGER THRESHOLDS
All thresholds are measured by using a pulse with TR = 2s, THIGH = 2s, and TF = 10s. The repetition
rate must not increase the PEAK voltage.
Figure 4.
4
FUNCTIONAL DESCRIPTION
4.1 Signal Path
The TDA7338 Stereodecoder contains all necessary functions for processing the MPX signal. Due to the
external input resistance (Pin 20) the circuit can be adapted to different MPX input levels. Behind a 80kHz
lowpass filter the adjustment free PLL for the pilot Tone is placed.
The only external component needed for the PLL is the ceramic resonator for the oscillator which runs at
456kHz.
The pilot detector output is designed as an open collector output, therefore an external pullup resistor is
needed. To force the decoder to "MONO" Pin 19 has to be clamped to a voltage below 0.8V.
The voltage level (signal strength from the IF part) applied to Pin 15 (VHCC) allows to control the time
constant of the deemphasis (nom. = 50
s, see fig. 5). If the RF-signal is weak, the corner frequency is
reduced down to 1kHz to improve the signal to noise ratio.
α67
V
O signal
() at1KHz
()
V
O spurious
() at9KHz
()
------------------------------------------------------------------
=
α114
V
O signal
() at1KHz
()
V
O spurious
() at4KHz
()
------------------------------------------------------------------
=
α190
V
O signal
() at1KHz
()
V
O spurious
() at4KHz
()
------------------------------------------------------------------
=
VTR
Vin
DC
TR
THIGH
TF
Time
D95AU365
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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