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參數(shù)資料
| 型號： | U2861B-MFPG3 |
| 英文描述： | Mono FM Sound Demodulator for TV Systems |
| 中文描述： | 單聲調(diào)頻解調(diào)器電視系統(tǒng) |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 263K |
| 代理商： | U2861B-MFPG3 |
U2861B
TELEFUNKEN Semiconductors
Rev. A1, 20-May-97
Preliminary Information
2 (11)
Circuit Description
Sound IF Limiter Amplifier
The intercarrier signal coming from the sound filter is fed
to a 7-stage limiter amplifier. This guarantees high input
sensitivity and excellent AM suppression.
PLL – FM Demodulator
The alignment-free “Phase-Locked-Loop” (PLL) FM
demodulator covers a wide frequency range of 4.5 MHz
up to 6.5 MHz with excellent noise performance. Due to
the fact that the voltage-to-frequency characteristic is
linear, a low harmonic distortion can be achieved. The
free-running frequency of the internal VCO circuit is
about 5.5 MHz.
The demodulated FM signal is led via de-emphasis and
buffered to Pin 12. The de-emphasis low pass filter con-
sists of an internal 5-k
W series resistor and an external
capacitor at Pin 14. The FM muting is possible by switch-
ing Pin 5 to ground.
Audio Switch 1
The first audio switch (Pin 13) has inputs for the demodu-
lated FM signal and the external AF1 signal from Pin 1.
For multistandard purposes, it is possible to handle inter-
nal FM and external AM audio signals. The output of
switch1 is also permanently available at Pin 12 (e. g. for
SCART interface).
Audio Switch 2 and Volume Control
The second audio switch (Pin 11) has inputs for the audio
signal from switch 1 and the external AF2 signal at Pin 10.
The switched AF signal is fed to volume control. The out-
put voltage can be controlled by a DC voltage at Pin 9.
Internal Voltage Stabilizer
The internal bandgap reference ensures constant perfor-
mance independent of supply voltage and temperature.
Pin Description
Pin
Symbol
Function
1
vi,AF1
Audio input 1 (e.g. AM signal)
2
Cdec
Decoupling capacitor
3
vi,SIF
FM sound IF input
4
GND
Ground
5
Vmute
FM mute switch
6
Cref
Internal reference voltage
7
Vs
Supply voltage
8
vo,AF2
Switched audio output 2
9
Vvol
Volume control
10
vi,AF2
Audio input 2
(e.g. from SCART)
11
Vsw2
Audio switch 2
12
vo,AF1
Switched audio output 1
13
Vsw1
Audio switch 1
14
Cdem
De-emphasis and mute switch
14
13
12
11
1
2
3
4
U2861B
10
9
8
5
6
7
vi,AF1
Cdec
vi,SIF
GND
Cref
VS
Cdem
VSW1
vo,AF1
VSW2
vi,AF2
Vvol
vo,AF2
96 11833
Vmute
Figure 2. Pinning
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| U2861B-MFPG3Y71 | 功能描述:射頻無線雜項 COM.VIDEO FM DEMODLTR (MONO) RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U2861B-MFPY 71 | 功能描述:IC DEMOD MONO FM FOR TV 14SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| U2861B-MFPY71 | 功能描述:射頻無線雜項 COM.VIDEO FM DEMODLTR (MONO) RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U2891B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:2.5 GHz Quadrature Up-Converter |
| U2891B-AFS | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:2.5 GHz Quadrature Up-Converter |
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