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AK2346A 데이터시트 PDF




AKM에서 제조한 전자 부품 AK2346A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AK2346A 기능
기능 Two-way Radio Audio Processor
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AK2346A 데이터시트, 핀배열, 회로
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 has 16
different carrier clocks.
MSK Modem for data communication can be chosen either 2400bit/s or 1200bit/s. 2400bit/s data rate
provides a high speed data transmission and 1200bit/s supports a low BER (bit error rate)
performance that is suitable for under weak electrical field condition application.
There are four signal level adjusters for microphone, modulator and demodulator sensitivity by digital
controlled amplifier (volume).
MS1289-E-02
-1-
2 012/06
http://www.Datasheet4U.com




AK2346A pdf, 반도체, 판매, 대치품
ASAHI KASEI
[AK2346A]
5. Circuit Configuration
Block Description
TXA1
VR1
(HPF)
Compressor
Pre-emphasis
TX/RXHPF
Scrambler/
Descrambler
Adder1/2
Limiter
DAC
VR2
Splatter
SMF
RXA1
VR3
RXLPF
The operational amplifier for transmit audio gain adjustment and for the filter to eliminate
aliasing noise by the SCF(switched capacitor filter) in the following stage. Please select
an external resistor and capacitor to set the gain less than 30dB and the cut-off frequency
to about 10kHz.
Digitally controlled amplifier (volume) for transmit audio signal level which is adjustable in
1.5dB steps over a –18.0dB to +4.5dB range by setting VR13 to VR10 register.
The circuit to compress transmits audio signal level by 1/2 in dB scale.
Standard cross-point is –10dBx. TC register sets OFF/ON to the circuit.
The circuit to emphasis the high-frequency component of transmit audio signal to improve
S/N ratio of the modulation signal.
The High-pass filter to eliminate the low-frequency component less than 250Hz for
transmit and receive audio signal.
This circuit is turned on and off by HPFSW register.
Scramble/De-scramble circuit to inverse transmit and receive audio spectrum by 2.844 to
3.491kHz carrier signal.
EM and PCONT register can set scramble/de-scramble or emphasis circuit. Both circuits
can not be used simultaneously.
The circuit to add audio signal and external tone signal.
TXINSW,TXSW2,1,0 registers are used to set this block.
An amplitude limiting circuit to suppress the frequency deviation of the modulation signal.
The limitation level can be adjusted by internal DAC.
Digitally controlled amplifier (volume) for the limitation level of the limiter circuit which is
adjustable in 0.5dB steps over a -17.6dB to -2.1dB range by setting LIMLV3 toLIMLV0
register.
Digitally controlled amplifier (volume) for MOD output level which is adjustable in 0.2dB
steps over a –3.2dB to +3.0dB range by setting VR25 to VR20 register. VR25 is a
–6.4/0dB coarse bit.
The circuit to eliminate the high frequency component higher than 3kHz included in the
limiter output signal or the MSK modulator signal. The cut-off frequency can be selected
by SPL register.
The smoothing filter to eliminate the high frequency and clock component caused in SCF
circuits.
The operational amplifier for receives audio gain adjustment and for the filter to eliminate
aliasing noise by the SCF in the following stage. Please select an external resistor and
capacitor to set the gain less than 20dB and the cut-off frequency to about 40kHz.
Digitally controlled amplifier (volume) for receive audio signal level which is adjustable in
0.5dB steps over a –4.0dB to +3.5dB range by setting VR33 to VR30 register.
The Low-pass filter to eliminate the high frequency component higher than 3kHz for
receive audio signal.
De-emphasis
The circuit to de-emphasis the emphasized signal by pre-emphasis circuit.
Expander
VR4
TXA2
The circuit to expand the receive audio signal level to double in dB scale compressed by
compressor
Standard cross-point is –10dBx. TC register sets OFF/ON to the circuit.
Digitally controlled amplifier (volume) for Expander output level which is adjustable in
0.25dB, steps over a –18dB and –4.5dB to +4.5dB range by setting VR42 to VR40
register.
The operational amplifier for transmit audio gain adjustment and for the filter to eliminate
aliasing noise by the SCF(switched capacitor filter) in the following stage. Please select
an external resistor and capacitor to set the gain less than 30dB and the cut-off frequency
to about 10kHz.
MS1289-E-02
-4-
2 012/06

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AK2346A 전자부품, 판매, 대치품
ASAHI KASEI
• Pin Assignment
[AK2346A]
TXIN
TXINO
EX TIN2
MOD
R STN
M SK DATA
18 17 16 15 14 13
19 12 FI LTE RO
20 11 R XINO
21 10 R XIN
22 9 AVDD
23 8 VS S1
24 7 D VDD
1 234 56
MS1289-E-02
-7-
2 012/06

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