Datasheet > AK2347B

AK2347B

更新时间： 2024-09-19 12:54:43

品牌	Logo	应用领域
AKM		无线
页数	文件大小	规格书
34页	341K
描述
Two-way Radio Audio & Sub-Audio Processor

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AK2347B 数据手册

ASAHI KASEI

[AK2347B]

AK2347B

Two-way Radio Audio & Sub-Audio Processor

1. Features

• Audio processing

• TX and RX amplifier

• Pre/De-emphasis circuit

• Compressor and Expander with no external components

• Scrambler and De-scrambler in frequency inversion type (3.388kHz or 3.290kHz)

• Limiter with level adjuster

• Splatter filter for wide and narrow band

• Digital controlled amplifier for microphone, modulator and demodulator sensitivity

• Sub-Audio filter with level adjuster for CTCSS and DCS

• Low power supply operation: 2.7 to 3,3V

• Wide range operating for temperature: -40 to 85 °C

• Oscillator circuit for 3.6864MHz and 3.579545MHz crystal

• Serial control interface operation

• Compact plastic packaging, 24-pin SSOP

2. Description

AK2347B includes audio filter, limiter, splatter filter, compandor, scrambler, which is highly integrated

two-way radio baseband functions for FRS and LMR.

Audio high-pass filter shows a high attenuation in magnitude response characteristics under 250Hz

that supports to eliminate a subaudio tone clearly.

TX limiter for deviation control has a limiting level adjuster by applying a DC voltage via external

components. Splatter filter has the magnitude response for narrowband(fc=2.55kHz) and

wideband(3.0kHz) to meet various regulatory agencies in the world wide.

Compandor is no adjustment type because it includes all parametric components inside the chip.

Scrambler circuit is composed of frequency inversion circuit by double balanced mixer that has

3.388kHz and 3.290kHz carrier clock.

Sub-Audio filter with level adjuster is available for pre- or post-filter for CTCSS and DCS.

There are four signal level adjusters for microphone, modulator and demodulator sensitivity by digital

controlled amplifier (volume).

• Pin Assignment (Top view)

AGNDIN

AGND

TXINO

TXIN

RXIN

RXINO

FILTERO

RXOUT

DINO

EXTIN

EXTINO

LIMLV

MOD

DIN

RSAOUT

TSAOUT

VDD

VSS

SDATA

SCLK

CSN

XOUT

XIN

TEST

MS1419-E-00

2012/05

- 1 -

12 3 4 5 6 7...34

中文翻译

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