AK2346B Datasheet, PDF (6/31 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346B]
Package
Signal
Pin No Name Type
13 SCLK
I
14 DIR
I
15 XOUT
I
16 XIN
I/O
17 VDD
PWR
18 EXPOUT
O
19 RXAFIN
I
20 RXAF
O
21 RXLPFO
O
22 RXINO
O
23 RXIN
I
24 TEST
I
Function
Clock input pin for serial data I/O.
Serial data I/O control pin.
Crystal oscillator connecting input pin.
Crystal oscillator connecting input and output pin.
To connect a 3.6864MHz crystal oscillator between this pin and XOUT pin
generates the reference clock internally.
In case of externally supplied clock operation, connect to this pin. For more
information, please refer to external application circuits.
Positive power supply pin.
Normally connect to 1.9V to 5.5V noiseless power-supply. Also this pin must be
decoupled to VSS pin by 0.1uF capacitor mounted close to the device pins.
Expander and VR4 output pin.
Receive audio signal input pin.
This is the inverting input of RXA2. It composes a smoothing filter by external
resistor and capacitor.
Receive audio signal output pin.
This is the output pin of RXA2. Load impedance more than 10kΩ can be driven.
Receive LPF output pin.
This is a monitor pin for tone signal. 57.6kHz sampling-clock is included, so
please eliminate this signal component by LPF externally.
Load impedance more than 10kΩ can be driven.
RXA1 feedback output pin.
Demodulated audio signal input pin.
This is the inverting input of RXA1. It composes a pre-filter with external resistor
and capacitor.
Test register control input pin.
When this pin set to high level, test register is controllable. Please set to low
level or open for normal operation.
MS1409-E-00
-6-
2012/05