3845 datasheet(3/8 Pages) ALLEGRO

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3845

AM NOISE BLANKER

www.allegromicro.com

Limits

Characteristic

Leads

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage Range

Operating

7.5

9.0

Quiescent Supply Current

VRF = 0

—

RF INPUT AMPLIFIER:

Trigger Threshold

Noise Pulse Amplitude for VRF = 0

100

240

µV

Modulation Threshold

Noise Pulse Modulation for VRF = 1 mV

220

Detector Rise Time

C13 = 0

—

500

—

RF SWITCH:

ON Resistance

17-18

—

100

Ω

OFF Resistance

17-18

—

100

—

Ω

Time Delay

1-17

From Beginning of RF Pulse

—

1.5

5.0

µs

to Beginning of RF Blanking

AUDIO SWITCHES:

Attenuation

10-9, 11-12

Noise

9, 12

—

1.5

mVpp

Crosstalk

9, 12

—

Gain

10-9, 11-12

-1.2

-0.3

Total Harmonic Distortion

9, 12

Vaf =700 mV, Vnoise = 0

—

<0.1

1.0

Input Impedance

10, 11

—

100

—

Ω

Output Impedance

9, 12

—

1.0

—

Ω

BLANKING TIMERS:

RF Blanking

R15 = 350 k

Ω

µs

Audio Delay

R5 = 350 k

Ω

µs

Audio Blanking

R6 = 110 k

Ω, C8 = 0.0012 µF

210

250

400

µs

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.

Test

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