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AK2347A

Asahi Kasei Microsystems
Part Number AK2347A
Manufacturer Asahi Kasei Microsystems
Description Two-way Radio Audio & Sub-Audio Processor
Published May 25, 2014
Detailed Description [AK2347 A] AK2347A Two-way Radio Audio & Sub-Audio Processor Features • Audio processing • TX and RX amplifier • Pre/De...
Datasheet PDF File AK2347A PDF File

AK2347A
AK2347A

Overview
[AK2347 A] AK2347A Two-way Radio Audio & Sub-Audio Processor 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 QFNJ (4.
0x4.
0x0.
75mm 0.
5mm pitch) Description AK2347A 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) RSAOUT TSAOUT 14 RXOUT DINO VDD 13 12 11 10 9 8 7 1 TXIN 2 EXTIN 3 EXTINO 4 LIMLV 5 MOD 6 VSS XO UT XIN TEST CSN SCLK SDA TA DIN 16 18 FILTERO RXINO RXIN AGNDIN AGND TXINO 19 20 21 22 23 24 ...


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