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What is AK2345?

This electronic component, produced by the manufacturer "Asahi Kasei Microsystems", performs the same function as "FRS CTCSS Encoder/Decoder".


AK2345 Datasheet PDF - Asahi Kasei Microsystems

Part Number AK2345
Description FRS CTCSS Encoder/Decoder
Manufacturers Asahi Kasei Microsystems 
Logo Asahi Kasei Microsystems Logo 


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ASAHI KASEI
[AK2345]
AK2345
FRS CTCSS Encoder/Decoder
Features
1. CTCSS (Continuous Tone Controlled Squelch System) Encoder/Decoder.
2. Programmable for up to 50 CTCSS frequencies.
3. Integrated CTCSS signal elimination filter.
4. Built-in Adder TX CTCSS/CDCSS and voice signal.
5. Built-in high speed CTCSS Decoder.
6. Conform to CDCSS. (Continuous Digital Controlled Squelch System)
7. Integrated voice signal circuits such as a limiter, splatter filter, etc.
8. Built-in (3.6864 MHz or 4.194304 MHz) oscillator circuit with crystal oscillator.
9. Control register controlled via serial interface.
10. CMOS Process low voltage operation. (1.8V…5.5V)
11. Compact plastic package is used. (24 pin VSOP)
(Page 25)
Description
The AK2345 is an IC which supports CTCSS (Continuous Tone Controlled Squelch System),
compatible with the TIA/EIA-603 standard.
A single CTCSS may be selected from among 50 different frequencies within a range of from
67 to 254.1 Hz. By sending that CTCSS simultaneously with the voice signal during
transmission, and by setting the audio circuit so that it operates only when a CTCSS of that
frequency is detected, it is possible to have multiple communications on the same radio
frequency.
TX has a built-in Adder CTCSS and voice signal, and RX has a built-in high-speed CTCSS
Decoder respectively.
Voice signal filters, a limiter, op-amp, and other circuits are integrated, making it possible to
configure a radio base band unit, especially FRS from a single chip.
Pin assignment
TXIN1
TXIN2
TXINO
MOD
MODIN
SPOUT
RXOUT
VDD
XIN
XOUT
STB
SDATA/DCS
1
2
3
4
5
6
7
8
9
10
11
12
24 RXTONE
23 RXIN
22 RXINO
21 AGNDIN
20 AGND
19 LIMLV
18 LIMBS
17 DREF
16 TXTONE
15 VSS
14 DETOUT
13 SCLK
C0041-E-03
-1-
2006/09

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AK2345 equivalent
ASAHI KASEI
[AK2345]
Block
Detector
AGNDG
BIASG
Function
Circuit which judges if CTCSS is present or not from the TSQBPF2
output signal.
Circuit for generating a reference voltage for internal analog circuits.
Circuit which determines the operating current of the operational
amplifiers used internally.
Pin No.
1
Pin Name
TXIN1
2 TXIN2
3 TXINO
4 MOD
5 MODIN
6 SPOUT
7 RXOUT
8 VDD
9 XIN
10 XOUT
11 STB
12 SDATA/DCS
13 SCLK
Pin / Function
I/O Function
Transmit signal input pin 1. This is the inverted input of
I AMP1. A mic amp is configured by connecting
resistors and capacitors externally.
Transmit signal input pin 2. This is the inverted input of
I
AMP1. The input signal of TXIN1 and TXIN2 are
added and output to the TXINO pin. This input is
muted with setting “TXON” data of control register.
O
AMP1 output pin. This pin can drive a 30kohm ( AC
resistance) or greater load.
O
Transmit modulation signal input pin. This pin can drive
a 10kohm (AC resistance) or greater load.
Transmit modulation signal input pin. This is the
I inverting input for AMP3. Connecting external resistors
and capacitors configures a smoothing filter.
Splatter filter output pin.
O It can drive a 10kohm (AC resistance) or higher load.
“SW1” data can bypass the Limiter to Splatter.
Receiving voice signal output pin. It can drive a 10kohm
O (AC resistance) or higher load. When in the standby
state, the impedance at this pin becomes high.
-
Positive power supply pin.
A 1.8V…5.5V voltage is applied.
Crystal oscillator connection pins. By connecting a
3.6864MHz or 4.194304MHz oscillator between these 2
pins, a reference clock used internally by the IC is
I/O created. The frequency of crystal oscillator is set by
CKSL data of control register. When a clock is supplied
externally, please refer to external application circuits.
(Refer to Page 25 Fig.2 or 3)
I Crystal oscillator connection pins.
I Serial data strobe signal input pin.
Serial data input pin. 8 bit serial data are input for setting
operating modes or CTCSS/CDCSS frequencies, etc.
I After setting “DCS” with serial data, CDCSS code is
available and output from TXTONE pin through
TSQLPF1 filter. (Refer to Page 8)
I Clock input pin for serial data.
C0041-E-03
-5-
2006/09


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On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AK2345 electronic component.


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