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PDF AK2347B Data sheet ( Hoja de datos )

Número de pieza AK2347B
Descripción Two-way Radio Audio & Sub-Audio Processor
Fabricantes AKM 
Logotipo AKM Logotipo



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No Preview Available ! AK2347B Hoja de datos, Descripción, Manual

ASAHI KASEI
[AK2347B]
AK2347B
Two-way Radio Audio & Sub-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 (3.388kHz or 3.290kHz)
• Limiter with level adjuster
• Splatter filter for wide and narrow band
• Digital controlled amplifier for microphone, modulator and demodulator sensitivity
• Sub-Audio filter with level adjuster for CTCSS and DCS
• Low power supply operation: 2.7 to 3,3V
• Wide range operating for temperature: -40 to 85 °C
• Oscillator circuit for 3.6864MHz and 3.579545MHz crystal
• Serial control interface operation
• Compact plastic packaging, 24-pin SSOP
2. Description
AK2347B includes audio filter, limiter, splatter filter, compandor, scrambler, 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 under 250Hz
that supports to eliminate a subaudio tone clearly.
TX limiter for deviation control has a limiting level adjuster by applying a DC voltage via external
components. 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
3.388kHz and 3.290kHz carrier clock.
Sub-Audio filter with level adjuster is available for pre- or post-filter for CTCSS and DCS.
There are four signal level adjusters for microphone, modulator and demodulator sensitivity by digital
controlled amplifier (volume).
• Pin Assignment (Top view)
MS1419-E-00
AGNDIN
AGND
TXINO
TXIN
EXTIN
EXTINO
L IM LV
MOD
VSS
SDATA
SCLK
CSN
1
2
3
4
5
6
7
8
9
10
11
12
24 RXIN
23 RX INO
22 FI LTERO
21 RX OUT
20 DINO
19 DIN
18 RSAO UT
17 TSAO UT
16 VD D
15 XO UT
14 XIN
13 TEST
-1-
2 012/05
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AK2347B pdf
ASAHI KASEI
[AK2347B]
Block Fun
DTA1
Sub-Audio
Programmable LPF
VR5
AGND
OSC
Control
Register
ction
Operational amplifier for gain adjustment of the Sub-Audio LPF input signal and for the
filter for preventing aliasing noise in the SCF circuit in the subsequent stage. Use
external resistors and capacitors to set the gain to 0dB or less and the cut-off frequency
to around 10kHz.
Low-pass filter to eliminate components of the DAT1 signal in the transmit operation and
of RXA1 signal in the receive. This circuit is controlled by the SASW register for transmit
or receive and by the SA5 to SA0 for cut-off frequency.
This circuit control s the v olume fo r adj usting th e ou tput level fro m the Sub-A udio LPF
signal.
Setting registers: VR54 to VR50, adjustment range: -6.0dB to +6.0dB in 0.5dB steps
This circuit generates the reference voltage (1/2VDD) for internal analog signals.
This circuit g enerates a 3 .6864MHz or 3.5795 45MHz reference clo ck signal from an
external resistor and crystal oscillator. This circuit is controlled by the MCKSL register.
Control regi sters set the switch status and vo lume for level a djustment insi de the IC
according to the se rial in put dat a con sisting of 1 -bit instru ction and 4-bit add ress and
8-bit data. At power-up, the registers are set to the power-down values by the power-on
reset circuit. This circuit has a software reset named RSTN register.
(See the description of the registers)
6. Pin Functions
Pin
number
Pin name
1 AGNDIN
2 AGND
3 TXINO
4 TXIN
5 EXTIN
6 EXTINO
7 LIML V
8 MOD
9 VSS
10 SDATA
Pin
type
AI
AO
AO
AI
AI
AO
AI
AO
PWR
DB
Power-
down
status
*3)
*3)
Function
Analog ground input pin
This pin is connected to a cap acitor to st abilize th e analog g round
level.
Analog ground output pin
This pin is connected to a cap acitor to st abilize th e analog g round
level.
Z Output pin of TXA1 *1)
Transmit audio signal input pin
Z This pi n is th e inverting i nput pin of TX A1. This pin , with re sistors
and capacitors externally connected, forms a microphone amplifier.
External input pin
This pi n is th e inverting i nput pin of TX A2. This pin , with re sistors
Z and capacitors externally connected, forms a amplifier.
An external signal su ch as a t one signal other than the audio signal
can be input.
*3) Output pin of TXA2 *1)
Limit level adjustment pin
*4)
The limit level can be adj usted by apply ing a DC volt age to this pin.
When this pin is lef t open, the limit level pred etermined withi n the
device is set.
Z Modulated transmit signal output pin *2)
-
Negative power supply pin
Normally, apply 0V.
Z Serial data input and output control pin
MS1419-E-00
-5-
2 012/05

5 Page





AK2347B arduino
ASAHI KASEI
Audio path frequency response for TX
[AK2347B]
20
10
0
-10
-20
-30
-40
-50
-60
1.E+02
1.E+03
FREQUENCY(Hz)
1.E+04
Figure 1: TX overall response with pre-emphasis.
SPL=0
SPL=1
20
10
0
-10
-20
-30
-40
-50
-60
1.E+02
1.E+03
FREQUENCY(Hz)
SPL=0
SPL=1
1.E+04
MS1419-E-00
Figure 2: TX overall response without pre-emphasis.
- 11 -
2 012/05

11 Page







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