3845 Ver la hoja de datos (PDF) - Allegro MicroSystems
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3845 Datasheet PDF : 8 Pages
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3845
AM NOISE BLANKER
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 7.5 V to
11 V, frf = 1 MHz, Noise (fnoise) = 500 Hz Square Wave, faf = 1 kHz, Test Figure.
Characteristic
Supply Voltage Range
Quiescent Supply Current
RF INPUT AMPLIFIER:
Trigger Threshold
Modulation Threshold
Detector Rise Time
RF SWITCH:
ON Resistance
OFF Resistance
Time Delay
Test
Leads
20
20
Test Conditions
Operating
VRF = 0
Min.
7.5
—
Limits
Typ. Max.
9.0
12
15
22
1
Noise Pulse Amplitude for VRF = 0
45
100
240
1
Noise Pulse Modulation for VRF = 1 mV
35
75
220
13
C13 = 0
—
500
—
17-18
17-18
1-17
From Beginning of RF Pulse
to Beginning of RF Blanking
—
30
100
—
100
—
—
1.5
5.0
Units
V
mA
µV
%
ns
Ω
kΩ
µs
AUDIO SWITCHES:
Attenuation
Noise
Crosstalk
Gain
Total Harmonic Distortion
Input Impedance
Output Impedance
BLANKING TIMERS:
RF Blanking
Audio Delay
Audio Blanking
10-9, 11-12
9, 12
9, 12
10-9, 11-12
9, 12
10, 11
9, 12
Vaf =700 mV, Vnoise = 0
17
R15 = 350 kΩ
9
R5 = 350 kΩ
9
R6 = 110 kΩ, C8 = 0.0012 µF
55
80
_
dB
—
1.5
12
mVpp
40
60
—
dB
-1.2
-0.3
0
dB
—
<0.1
1.0
%
—
100
—
kΩ
—
1.0
—
kΩ
35
60
75
µs
30
55
67
µs
210
250
400
µs
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