AK2346A

ASAHI KASEI [AK2346A] AK2346A Two-way Radio 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 with 16 different carrier clocks Limiter with level adjuster Splatter filter for wide and narrow band Digital controlled amplifier for microphone, modulator and demodulator sensitivity 1200/2400bit/s MSK Modem with frame detection Wide range operation voltage: 2.6V to 5.5V, temperature: -40 to 85 °C Oscillator circuit for 14.7456MHz crystal Serial control interface operation Compact plastic packaging, 24-pin QFNJ (4.0 x 4.0 x 0.75mm 0.5mm pitch) 2. Description AK2346A includes audio filter, limiter, splatter filter, Compandor, scrambler, MSK Modem, 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 less than 250Hz that supports to eliminate a sub-audio tone clearly. TX limiter for deviation control has a limiting level adjuster controlled by a 4-bit signal level adjuster. 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 ha...