AK2347A

[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...