Datasheet > 3848

3848

更新时间： 2024-10-01 22:13:43

品牌	Logo	应用领域
急速微 - ALLEGRO		接收机
页数	文件大小	规格书
4页	76K
描述
DUAL-CONVERSION AM RECEIVER

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3848 数据手册

3848

DUAL-CONVERSION AM RECEIVER

3848

DUAL-CONVERSION AM RECEIVER

Providing the AM signal processing functions for an electronically

tuned AM receiver (ETR), the A3848EEQ includes two balanced

mixers, a crystal local oscillator, an L/C-tuned local oscillator, oscillator

buffer, IF amplifier, AM detector, scan control detectors, and a switch-

able voltage regulator. This dual-conversion device typically mixes the

incoming RF up to a first IF of 10.7 MHz, then down to 450 kHz, and

then detects the audio. The addition of a JFET matched to a whip

antenna, RF low-pass filter, IF selectivity, and audio stages gives a

complete AM radio which can be used in automotive receivers. The

frequency-detecting stop circuit is also capable of recovering narrow-

band FM, making it useful for scanners or weather band radio applica-

tions. Two AGC and field-strength indicator modes provide special

features for scanning.

SUB

MIX 2 OUT

FSI

REGULATOR

AFC OUT

REG

DET

AGC (MUTE)

CRYSTAL

STOP

AGC RATE 2

MIX 1 IN

MIX 2 OUT

MIX 1 OUT

MIX 2 E

MIX 1 OUT

AGC

MIX 2 E

WB AGC 1 IN

RESET

The A3848EEQ uses the dual criteria of frequency and amplitude

for establishing a valid stop. Tuning accuracy (frequency criterion) is

established by evaluating phase shift across the detector coil. The

circuitry is similar to that used in FM discriminators. Because this

detection system is phase operated, it remains effective even in the

presence of strong signals, which can cause false stops in systems

using narrow-band filters. The amplitude criterion for stop is deter-

mined by evaluating the IF level. It includes a unique circuit that

removes the effect of the AGC action. This allows the AGC tuning

components to be selected for low-frequency audio performance

without compromising scanning speed.

MIX 2

BYPASS

REF

Dwg. PS-012-1

Dwg. No. PS-012-1

In the normal AGC mode (AGC RESET low), a slow, narrow-band

field-strength indicator (FSI) is provided for controlling signal-depen-

dent functions such as stereo blending. A fast AGC mode (AGC

RESET high) resets the AGC holding capacitors to maximum gain.

This mode allows cataloging station strengths quickly during a band

sweep.

This AM signal processor is packaged in a rectangular, 32-lead,

plastic, leaded chip carrier (PLCC) for surface-mount applications and

is rated for operation over the temperature range of -40°C to +105°C

are available on special order.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V_CC. . . . . . . . . . . . . . 12 V

Package Power Dissipation, P_D. . . . 1.2 W

Operating Temperature Range,

FEATURES

■ Low Noise Figure

■ Field-Strength Indicator

■ Buffered Oscillator

T_A. . . . . . . . . . . . . . . -40°C to +105°C

Storage Temperature Range,

■ Balanced Mixers

■ High Dynamic Range First Mixer ■ Fast Scan Mode

Always order by complete part number: A3848EEQ .

T_S. . . . . . . . . . . . . . . -65°C to +150°C

12 3 4

中文翻译

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384-95	ETC	获取价格	LAGERSYSTEM DRAHTSPULEN RACK 2STANGEN
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3-84981-2	MACOM	获取价格	FPC Connector Family

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