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| 型號： | MC13122DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 接收器 |
| 英文描述： | AMAX STEREO IC CHIPSET |
| 中文描述： | AM, AUDIO DEMODULATOR, PDSO28 |
| 封裝： | PLASTIC, SO-28 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 586K |
| 代理商： | MC13122DW |
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MC13027 MC13122
7
MOTOROLA ANALOG IC DEVICE DATA
Figure 4. MC13027 Internal Block Diagram
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
WB AGC Amp
Mixer
IF Amp
NB Amp
VCC
÷
4
RF Time
MV
AF Del
MV
AF Time
MV
X1
Reg
X1
WB AGC
In
Blanker
AGC
Feedback
4.0 V Reg
RF Gnd
Mixer In
Blanker RF In
4.0 Filter
VCC
VCO
LO Out
WB AGC
Out
Audio
Blank Time
Audio
Blank Pulse
Audio Blank
Delay Time
IF Out
RF Blank
Time
IF In
Gnd2
RF Blank
Mixer Out
MC13027 FUNCTIONAL DESCRIPTION
The MC13027 contains the mixer, wide band AGC
system, local oscillator, IF pre–amplifier and noise blanker for
an AM radio receiver. It is designed to be used with the
MC13122 to produce a complete AM stereo receiver. The
VCO runs at 4 (Fin+FIF) and is divided internally by 4 for the
mixer input and local oscillator buffered output. Dividing the
VCO reduces the phase noise for AM stereo applications.
The noise blanker input is connected in parallel with the
mixer input at Pin 6. The noise blanker circuitry contains a
high gain amplifier with its own AGC so it remains linear
throughout the mixer’s linear range. It can detect noise
pulses as low as 120
μ
V and generates three pulses when
the noise threshold is exceeded. The width and timing of the
blanking pulses is set by the resistors connected to Pins 15,
17 and 19. The resistor on Pin 15 sets the length of the RF
blanking pulse and determines the time the transistor on
Pin 12 is “on”. The audio blanking pulse delay is set by the
resistor on Pin 17 and the width by the resistor on Pin 19.
This is necessary because the IF filtering delays and
stretches the noise as it arrives at the detector. The transistor
on Pin 18 goes “on” to cause noise blanking in the track and
hold circuit in the MC13122 (Pin 15).
Wideband AGC is used in auto receivers to prevent
overload – it drives the base of a cascode transistor RF
amplifier and also a pin diode at the antenna (See Figures 6
and 7).
A low gain IF amplifier between Pins 14 and 16 is used as
a buffer amplifier between the mixer output filter and IF filter.
The input resistance of the IF amplifier is designed to match
a ceramic IF filter. The gain of the IF amplifier is determined
by the impedance of the load on Pin 16.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC13122 | AMAX STEREO IC CHIPSET |
| MC13027DW | AMAX STEREO IC CHIPSET |
| MC13027P | AMAX STEREO IC CHIPSET |
| MC13122P | CONNECTOR KIT, JPS130PT; RoHS Compliant: Yes |
| MC13135DW | DUAL CONVERSION NARROWBAND FM RECEIVERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC13122P | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:AMAX STEREO IC CHIPSET |
| MC1312P | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:CBS SQ LOGIC DECODER SYSTEM |
| MC13135 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:DUAL CONVERSION NARROWBAND FM RECEIVERS |
| MC13135DW | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:DUAL CONVERSION NARROWBAND FM RECEIVERS |
| MC13135P | 制造商:LANSDALE 制造商全稱:LANSDALE Semiconductor Inc. 功能描述:FM Communications Receiver; Dual Conversion Narrowband FM Receiver |
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