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參數(shù)資料
| 型號： | A3845 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | AM NOISE BLANKER |
| 中文描述： | 上午噪音落料 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 233K |
| 代理商： | A3845 |
This noise blanker integrated circuit contains all of the necessary
circuitry for adding an extremely efficient (patented) noise-blanking
technique to any type of AM tuner or receiver with RF input frequen-
cies (or a first IF) to 30 MHz. The A3845ELW and A3845SLW
feature dual audio channels and are intended for AM-stereo or indepen-
dent sideband applications.
A high input impedance, high-gain, broadband RF amplifier
permits these devices to be directly connected to the RF stage of a
tuner. Internal AGC circuitry ensures that the noise detection threshold
remains constant with changes in input signal level. The RF gate
response time is sufficiently fast to blank the noise pulse at the output
of the mixer before the IF filter. Short blanking times effectively
suppress most of the interfering noise. Residual audio noise is re-
moved by an audio sample-and-hold gate. The RF blanking time,
audio gate delay time, and audio gate blanking time can all be indepen-
dently adjusted to suit the particular application.
These AM noise blankers are packaged in plastic SOICs and are
rated for operation over the a standard temperature range of -20
°
C to
+85
°
C (suffix ‘SLW’) or an extended temperature range to -40
°
C
(suffix ‘ELW’).
AM NOISE BLANKER
D
2
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Supply Voltage, V
CC
. . . . . . . . . . . . . .
12 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . . . . .
1.78 W
Operating Temperature Range, T
A
Suffix ‘ELW’ . . . . . . . .
-40
°
C to +85
°
C
Suffix ‘SLW’ . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . .
-55
°
C to +125
°
C
FEATURES
I
RF Blanking to 30 MHz
I
Single-Channel or Stereo Audio Blanking
I
Adjustable RF and Audio Blanking Time
I
Adjustable Audio Blanking Delay
I
Sample-and-Hold MOS Audio Gates
I
Internal Voltage Regulation
I
Minimum External Components
APPLICATIONS
I
AM and AM-Stereo Automotive Radios
I
CB Transmitter/Receivers
I
Short-Wave Receivers
I
Mobile Communications Equipment
3845
Always order by complete part number:
Part Number
Function
A3845ELW
A3845SLW
Stereo Noise Blanker, Extended Temp. Range
Stereo Noise Blanker, Standard Temp. Range
GROUND
13
14
15
16
17
19
12
18
20
11
1
2
3
8
9
4
5
6
7
10
RF AGC
SUPPLY
CC
V
AUDIO DELAY
RF BIAS
AUDIO BLANK
TIME (R)
AUDIO BLANK
TIME (C)
RF BLANK
TIME
AUDIO OUT
1
NO
CONNECT
NO
CONNECT
NC
NC
Dwg. PS-003-1A
RF GATE
LOW
RF IN
RF BYPASS
AUDIO IN
1
AUDIO OUT
2
AUDIO IN
2
NO
CONNECT
NC
RF GATE
HIGH
DET
NOISE
DIFFERENTIATOR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| A3845ELW | AM NOISE BLANKER |
| A3845SLW | AM NOISE BLANKER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3845ELW | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:AM NOISE BLANKER |
| A3845SLW | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:AM NOISE BLANKER |
| A3848EEQ | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:DUAL-CONVERSION AM RECEIVER |
| A38500-000 | 制造商:TE Connectivity 功能描述:VARISTOR 18VDC 10MM 20% LEADED 制造商:TE Connectivity 功能描述:VARISTOR 18V 500A DISC 10MM 制造商:TE CONNECTIVITY RAYCHEM-POLYSWITCH 功能描述:Var MOV 11VAC 14VDC 500A 18V Thru-Hole T/R |
| A3-8505-01 | 制造商:RadiSys 功能描述:MX S6800 G.711 CODEC LIC W/SUPT Q10 - Bulk |
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