AK2347A 查看數據表（PDF） - Asahi Kasei Microdevices

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AK2347A

Two-way Radio Audio & Sub-Audio Processor

Asahi Kasei Microdevices 

[AK2347A]

Pin

number

Pin name

11 XIN

12 XOUT

13 VDD

14 TSAOUT

Pin

type

DB

DI

PWR

AO

Power-

down

status

*5)

Function

Pin for connecting a crystal oscillator

A reference clock used within this IC is generated by connecting a

3.6864MHz or 3.579545MHz oscillator between this pin and the

adjacent XOUT pin. For detailed information about the connection

method and the method for supplying an external clock, see

“Recommended External Application Circuits”.

*5) Pin for connecting a crystal oscillator

Positive power supply pin

−

Connect this pin to a power supply ranging from 2.7V to 3.3V with

less noise. Connect a bypass capacitor of 0.1μF or higher between

this pin and the VSS pin.

Z Transmit Sub-Audio signal output pin *2)

15 RSAOUT AO

16 DIN

AI

17 DINO

AO

Z Receive Sub-Audio signal output pin *2)

Data input pin

This pin is the inverting input pin of DTA1. This pin, with resistors

Z and capacitors externally connected, forms a amplifier.

An external signal such as a tone signal through CPU port can be

input.

Z Output pin of DTA1 *1)

18 RXOUT

AO

19 FILTERO AO

20 RXINO

AO

21 RXIN

AI

22 AGNDIN

AI

23 AGND

AO

24 TXINO

AO

Z Receive audio signal output pin *2)

RXLPF or TX/RX_HPF block output pin

This pin can be used as a monitor pin for a signal such as a tone

Z signal. The output signal on this pin includes a 57.6kHz

sampling-clock component. So, perform waveform processing

externally as required. *2)

Z Output pin of RXA1 *1)

Demodulated receive signal input pin

Z Inverting input pin of RXA1. This pin, with resistors and capacitors

externally connected, forms a pre-filter.

Analog ground input pin

*3) This pin is connected to a capacitor to stabilize the analog ground

level.

Analog ground output pin

*3) This pin is connected to a capacitor to stabilize the analog ground

level.

Z Output pin of TXA1 *1)

Note) A: Analog, D: Digital, PWR: Power, I: Input, O: Output, B: Bi-directional, Z: High-Z, L: Low

*1) Output load requirement: [load impedance] > 30kΩ, [load capacitance] < 50pF

*2) Output load requirement: [load impedance] > 10kΩ, [load capacitance] < 50pF

*3) AGND (=1/2VDD) level

*4) AGND + 0.256(VDD-AGND) level

*5) When XOUT pin is set to low level, XIN pin goes to High-Z.

When XOUT pin is set to high level, XIN pin outputs low level.

MS0946-E-00

-6-

2008/03

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