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AK2345 の電気的特性と機能

AK2345のメーカーはAsahi Kasei Microsystemsです、この部品の機能は「FRS CTCSS Encoder/Decoder」です。


製品の詳細 ( Datasheet PDF )

部品番号 AK2345
部品説明 FRS CTCSS Encoder/Decoder
メーカ Asahi Kasei Microsystems
ロゴ Asahi Kasei Microsystems ロゴ 




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AK2345 Datasheet, AK2345 PDF,ピン配置, 機能
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

1 Page





AK2345 pdf, ピン配列
ASAHI KASEI
Block Diagram
MODIN
SPOUT
LIMLV
LIMBS
TXINO
[AK2345]
DREF
VSS
VDD
RXTONE
TXTONE
XOUT
XIN
C0041-E-03
-3-
2006/09


3Pages


AK2345 電子部品, 半導体
ASAHI KASEI
[AK2345]
Pin No. Pin Name
14 DETOUT
15 VSS
16 TXTONE
17 DREF
18 LIMBS
19 LIMLV
20 AGND
21 AGNDIN
22 RXINO
23 RXIN
24 RXTONE
I/O Function
CTCSS detects signal output pin. (Open drain output)
O
When in the receive mode, if a CTCSS at the frequency
set by serial data is detected; this signal goes “Low”.
In the transmit mode, it is high impedance at all times.
-
Negative power supply pin.
A voltage of 0V is applied.
Transmit CTCSS/CDCSS monitor pin.
When in the transmit mode, CTCSS of the frequency set
by serial data is output from this pin. CDCSS codes
from CPU input into SDATA/DCS pin, which is limited by
O TSQLPF1, is also output from this pin.
When in the receive mode, the AGND level is output.
When in the standby state, the impedance at this
terminal becomes high.
It can drive a 10kohm (AC resistance) or higher load.
CTCSS detect level adjust pin. The CTCSS decoder's
threshold level is determined by applying a DC voltage
I greater than the AGND level to this pin.
It is computed by Vth=0.575VDD formula.
( Refer to Page 21 and 24)
Limiter level fine adjustment pin.
I
By applying a DC voltage to this pin, fine adjustment of
the lower limit limiter level can be done and the limiter's
symmetry can be adjusted.
Limiter level adjustment pin.
I
The limit level can be adjusted by applying the DC
voltage to this pin. If no connections are made,
the pre-determined limiter level is set.
Analog ground pin. A 1/2VDD voltage, which
O becomes the reference for the analog circuit, is output.
Connect a capacitor to stabilize the analog ground.
I
Analog ground input pin. Connect a capacitor to
stabilize the analog ground.
O
AMP2 output pin. This pin can drive a 30kΩ (AC
resistance) or greater load.
Receive demodulation signal input pin. This is the
I inverted input of AMP2. A pre filter is configured by
connecting resistors and capacitors externally.
Receiving CTCSS/CDCSS monitor pin.
O
In the Receive mode, the designated CTCSS/CDCSS is
selected from the receiving signal. This pin can drive a
10kΩ (AC resistance) or greater load.
C0041-E-03
-6-
2006/09

6 Page



ページ 合計 : 27 ページ
 
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共有リンク

Link :


部品番号部品説明メーカ
AK2345

FRS CTCSS Encoder/Decoder

Asahi Kasei Microsystems
Asahi Kasei Microsystems
AK2345

CTCSS Encoder/Decoder

ETC
ETC
AK2346A

Two-way Radio Audio Processor

AKM
AKM
AK2346B

Two-way Radio Audio Processor

AKM
AKM


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