AK2347B Datasheet | Asahi Kasei Microdevices

Features - Audio processing - TX and RX amplifier - Pre/De-emphasis circuit - pressor and Expander with no external ponents - Scrambler and De-scrambler in frequency inversion type (3.388k Hz or 3.290k Hz) - 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 - pact plastic packaging, 24-pin SSOP 2. Description AK2347B includes audio filter, limiter, splatter filter, pandor, 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 ponents. Splatter filter has the magnitude response for narrowband(fc=2.55k Hz) and wideband(3.0k Hz) to meet various regulatory agencies in the world wide. pandor is no adjustment type because it includes all parametric ponents inside the chip. Scrambler circuit is posed of frequency inversion circuit by double balanced mixer that has 3.388k Hz and 3.290k Hz 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 EXTIN EXTINO LIMLV MOD VSS SDATA SCLK CSN 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 RXIN RX INO FI LTERO RX OUT DINO DIN RSAO UT TSAO UT VD D XO UT XIN TEST MS1419-E-00 -1- 2 012/05 http://.. ASAHI KASEI [AK2347B] 3. Contents 1. Features...