This document is not intended for
viewing onscreen. It is best viewed
when printed and read from paper.
Depending on your printer, you may need to select
“Shrink to Fit” in the print dialog to ensure that the
document prints correctly.
[AK2358FI
ASAHI KASEI
Base-band 1S1 for kopian Cordless Telephones(CTl, CT1+)
I
I
F e a t u r e s
Meets to the specification of the europian cordless telephones (CT1, CT1+)
Built-in voice filter for cordless telephone, MSK MODEM (2400bps), COMPANDOR, and
scrambler circuit
•1 Low / wide operation voltage range (1.9 V to 5.5V)
•1 Built-in COMPANDOR output transient response circuit and time constant circuit
•1 No external component is needed for COMPANDOR
•1 Built-in buffer amplifier for ceramic receiver driving.
•1 Built-in electronic volume for microphone sensitivity and modulator/demodulator
sensitivity
•1 Receiving level switchable in 8 steps (-12 to +9dB)
•1 Built-in ❑ uting function for voice transmitting and receiving
•1 External adjustment for the limiter level
•1 Built-in amplifier for transmission and reception gain adjustment
•1 Low power CMOS and power-down function
❑ Built-in 3.58MHz oscillator circuit
•1 Scrambler circuit with frequency inversion. Two inversion frequencies can be
selected.
•1 Bypassing the scrambler circuit available
❑ Built-in frame detection function for the MSK demodulator
❑ Control register and MSK MODEM data buffer controlled by serial interface
•1 Few external component is necessary resulting cost reduction and small set size.
El Package: 24 pin VSOP
•1
•1
B l o c k
I
D i a g r a m
splatter f i lter
Transmission s i g n a l
output
3 .58NHz
IT D a t a / R x D a t a
Control data
(
\ control register
i and data buffer
!4S1 MODEM
!rane d e t e c t i o n
Reception signal
Receiver
input
Eecept inn nutput
0152 E 00
1996/12
o
u-l
(w
.
PY
o
.
TXINO
.......................
a
TXIN
TDATA
TCLK
OIR
SCLK
01/0
ROF/FD
TXAFSW
3:
J
TXHPF
+VR1
9
~a
13
12
10
~11
Compressor
A
A
r
>
Control
register and
data buffer
>
>
~
_
T
+VR2
0
6
4
Preemphasis~
TC
MSK
Modulator
TAGND
Y
USK
Denodulator
Y
a
EN
BUFON
R e eiver
Splatter
filter
Limiter
4
?!
..................
.‘~
.....
. . . . . , .,:
Scrambler
PCONT
..............
.................
RXAFSW
RECSW , . . . . . . . . . . . . . . . . .
*~- +-
BUFOP
v
m
22
D e emphasis
...............
+I
J&&J
Expander
4
A
kMP3,.,;:
4+
De~
Scrambler
1
v
RXHPF
‘$
+VR3
j
...................
RXIN
I
19
18
Y
17
Y71’I
7
16
Y
v
“
Operating mode
w
1
ASAHI KASEI
[AK2358FI
D e s c r i p t i o n
[
I
The AK2358F, abase-band LSI for europian cordless telephone (CT1, CT1+), has built-in
voice filters, a 2400bps MSK MODEM for data communication, a frame detection circuit,
a COMPANDOR for noise reduction, and scrambler circuits.
The CMOS process provides low power operation. Application of 24 pin VSOP package with
the feature of significant reduction of external component provides minimum mounting area.
The time constant circuit for the COMPANDOR output transient response is built into the
LSI.
Using a 2400bps MSK MODEM for data communication has realized high data reliability and
high speed communication at the same time.
This LSI is suitable for cordless system telephones etc. which requires complicated
protocol control.
An oscillation circuit with a 3.58MHz crystal oscillator is built in, and no other
frequency source is required for the MSK MODEM. The oscillator also can be used for the
other DTMF generator etc.
The scrambler circuit uses the simple inversion ❑ ethod with inversion of the voice
spectrum around the carrier frequency. Two inversion frequencies can be selected.
Built-in electronic volumes provided for transmission and reception part realize automatic
adjustment of the microphone sensitivity and the modulator/demodulator sensitivity by
external EEPROM and microprocessor.
The transmission part is composed of high-pass filter, compressor, pre-emphasis circuit.
scrambler, limiter, MSK modulator, splatter filter, electronic volume control, etc.
The reception part is composed of band pass filter, de-emphasis circuit, de-scrambler,
expander, buffer amplifier, MSK demodulator, frame detection circuit, electronic volume
control, etc.
■ Pin Arrangement
24pin VSOP
24 a RAGND
23 -J XXIN
22 -J RXINO
21 -J BUFOP
AGNDINC 1 0
TAGNDC 2
TXINC 3
TXINOC 4
LIMLVC 5
MODC 6
Vssc 7
TCLKC 8
TDATAC 9
20 -J BUFON
19 -J RXAF
18 aBxAFIx
17 3 EXPOL’T
16 3 VDD
15 3 X1X
14 3 XOL’I
13 ~DIR
D1/Oc 10
ROF/FDc 11
SCLK ~ 12
199612
0152-E-00
-3-
ASAHI KASEI
I
[AK2358FI
C i r c u i t
Block
AMP1
TXHPF
Compressor
Pre-emphasis
Scrambler (Tx)
Limiter
Splatter filter
MSK modulator
AMP2
RXLPF
RXHPF
De-emphasis
De-scrambler (Rx)
Expander
I
C o n f i g u r a t i o n
Function
The operational amplifier for voice signal transmission gain
adjustment and for the filter to eliminate aliasing noise by the
SCF(switched capacitor filter) in the following stage. Use an
external resistor and capacitor to set the gain less than 30dB and
the cut-off frequency to about 10kHz.
The SCF circuit to eliminate the low frequency component less
than 300Hz from the transmission voice signal.
The circuit to compress the amplitude of the transmission voice
signal.
The circuit to emphasis the high-frequency component of the
transmission voice signal to improve the S/N of the modulation
signal.
The circuit to inverse the transmission voice spectrum in regard
to the carrier frequency. Carrier frequency can be selected from
two frequencies by KEY. PCONT select to use the scrambler or the
pre-emphasis circuit.
The amplitude-limiting circuit to suppress the frequency deviation
of the modulation signal. The limitation level can be adjusted by
applying a DC voltage to the LIMLV pin. If the LIMLV pin is open,
the default limitation level is applied.
The SCF circuit to eliminate the high frequency component higher
than 3.4kHz from the limiter output signal or the MSK ❑ odulator
signal.
The circuit to generate a 2400bps MSK signal according to the
received digital signal logic from the TDATA pin.
The operational amplifier to adjust the reception demodulation
signal gain and for the filter to eliminate the aliasing noise of
the SCF in the following stage. Set the gain to less than 30dB
and the cut-off frequency to about 10kHz by external resister and
capacitor.
The SCF circuit to eliminate the high frequency component higher
than 3.4kHz from the limiter output signal or the MSK modulator
signal.
The SCF circuit to eliminate the low frequency component lower
than 300Hz from the reception voice signal.
The circuit to de-emphasis the emphasized signal by pre-emphasis
circuit.
The circuit to re-inverse the spectrum of the scrambled receiving
voice signal respect to the carrier frequency. Carrier frequency
can be selected from two candidates by a KEY. The de-scrambler(Rx)
or ~he reemphasis circuit can be selected by PCONT.
‘the circuit to expand the signal amplitude compressed by the
compressor.
1996, 12
0152-E-00
“ 4 -
ASAHI KASEI
[AK2358FI
Block
AMP3
MSKHPF
MSK demodulator
AMP4
A!!P5
AGND
Oscillation
circuit
VR1
VR2
VR3
VR4
Control register
and data buffer
Function
The operational amplifier used on the smoothing filter of the
reception SCF output. Set the gain to OdB and the cut-off
frequency to about 20kHz by external resister and capacitor.
The SCF circuit to eliminate the low frequency component lower
than 100Hz from the reception MSK signal.
The circuit to reproduce the 2400bps receiving data and the clock
from the received MSK signal in the RXIN pin.
The inverting and the non-inverting buffer amplifier to drive the
ceramic receiver.
The circuit to generate the reference voltage for the internal
analog signal.
The circuit to oscillate the 3.58 MHz reference clock using an
external crystal oscillator and resistor.
The volume to control the input amplitude of the transmission
voice signal. The adjustment range is -8dB to +7dB by ldB step.
The volume to control the MOD output amplitude. The adjustment
range is -4dB to +3.5dB by 0.5dB step.
The volume to control the input amplitude of the reception
demodulation signal. “The adjustment range is -4dB to t3.5dB by
0.5dB step.
The volume to control the receiving voice amplitude. The
adjustment range is -12dB to +9dB by 3dB step.
The control register contlols the status of internal switches and
internal volumes of the LSI by serial data consists of 2 address
bits and 8 data bits. At the start up a power-on-reset circuit
works and the default values are set to the control register.
(see control register map.)
The data buffer stores 8 bits of the MSK receiving data to smooth
the signal interface with CPU.
I
P i n / F u n c t i o n
Pin No.
1
Pin name
AGNDIN
1 / 0
I
2
TAGND
o
3
TXIN
1
4
5
TXINO
LIMLV
o
1
I
\
I
Function
Analog ground input pin.
Connect the capacitor to stabilize the analog
ground.
Analog ground pin for the transmission system.
Connect the capacitor to stabilize the analog
ground.
Transmission voice input pin.
This is the inverting input pin for AMP1. It
composes a microphone amplifier with a external
resister and a caDacitor.
AilPl output pin.
Limitation level adjustment pin.
I The limitation level can be adjusted by applying a
\ DC voltage to this pin. The default limitation level
is adopted if no voltage is applied.
199612
0152-E-00
5-
ASAHI KASEI
Pin No.
6
[AK2358FI
Pin name
MOD
1/0
o
7
8
Ws
TCLK
—
o
9
TDATA
I
10
11
DI/O
RFD/FD
1 / 0
o
12
13
14
SCLK
DIR
XOUT
I
I
I
XIN
VDD
EXPOUT
RXAFIN
o
—
o
I
19
RXAF
o
20
21
22
23
BUFON
BUFOP
RXINO
RXIN
o
o
o
I
24
RiGiYD
o
‘1 5
16
17
18
Function
Output pin of the modulated transmission signal.
A load impedance larger than 10kQ can be driven.
Negative power supply pin.
Clock output pin for the MSK data transmission.
A 2.4kHz clock is put out by setting the internal
register TDE to “O”. If the register is set to “1”,
it goes “H” level.
MSK transmission data input pin.
Data are latched synchronizing with the TCLK rising
edge.
Serial data input and output pin.
MSK signal reception flag output and Frame detection
signal output pin.
This pin puts out two types of information,
depending on the status of the internal register
FSL. If FSL is “l”, it is klSK signal reception mode,
so the pin reaches low after 8 bits of the MSK
reception signal have been written to the data
register. If FSL is “O”, it is the frame detection
signal output mode, so the low pulse is put out
after a frame pattern is detected.
Clock input pin for serial data 1/0.
Serial data 1/0 control pin.
Crystal oscillator connection pin.
The reference clock IC is generated by connecting a
3.58MHz crystal oscillator parallel to a lMf2
resistor between this pin and XIN pin. In case of
external clock operation, connect XOUT pin to VSS
and apply the clock to XIN.
Crystal oscillator connection pin.
Positive power supply pin.
Expander output pin.
Reception voice input pin.
This is the inverting input of AMP3. It composes a
smoothing filter by external resistor and capacitor.
Reception voice output pin.
This is the output pin of AVP3. A load impedance
more than 10kQ can be driven.
Receiver amplifier output pins.
Connect the ceramic receiver between these two pins.
AMP2 output pin.
Demodulated receiving signal input pin.
This is the inverting input of AUP2. [t composes a
prefilter with external resistor and capacitor.
Analog ground pin for the reception systcm.
Connect the capacitor (o stabilize analog ground.
199612
0152-E-00
6-
ASAHI KASEI
[AK2358FI
I
A b s o l u t e
M a x i m u m
R a t i n g s
I
VSS=OV; Note 1)
Parameter
Power supply voltage: (VDD)
Input current
(except the power supply pins)
Analog input voltage
Digital input voltage
Storage temperature
Symbol
VA+
min
-0.3
max
6.5
flo
IIN
VINA
VIND
Ts tg
-0.3
-0.3
-55
(VA+)+O.3
(VA+)+O.3
130
Unit
v
mA
v
v
“c
Note l): All voltages with respect to the VSS pin.
Warning: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
R e c o m m e n d e d
O p e r a t i n g
C o n d i t i o n s
VSS=OV; Note 1)
Parameter
10~eration temperature
Power supply ;oltage: (VDD)
Analog reference voltage
Current consumption
Mode O
Mode 1
hlode 2
Mode 3
I
I Symbol I
Ta
,I
VD+
AGND
IddO
lddl
Idd2
Idd3
min
I -lo
1:9
I
I
tYD
2.0
l/2VD+
0.1
0.9
1.4
5.5
I
I
max
70
5:5
0.8
1.9
2.9
10
I Unit
I “c
v
v
mA
Note 1): All voltages with respect to the VSS pin.
0152-E-00
1996 12
-7
ASAHI KASEI
I
[AK2358FI
A n a l o g
C h a r a c t e r i s t i c
s
1
f=lkHz, PCONT=’’1”, TC=”l”, EM=’’1”, VR1 to VR4=OdB: unless otherwise specified,
OdBm=O.775Vrms
OdBx=-5dBm at AVDD=2V Note 8)
1) TX system
Parameter
Standard input level
@TXINO
Absolute gain
TXINO--+MOD
Note 1)
MOD lkHz
Limiter level
Note 1)
No external R
Adjustment range by
external R
Compressor linearity TXINO~MOD Note 1) 2)
TXINO=-44dBx
TXINO=-50dBx
Noise without input
TXINO+MOD
Note 1) 3)
Compressor distortion TXINO-hlOD
TXINO=-10dBx
Transmission MSK
Note 1)
@MOD
signal level
1.2kHz signal output
Transmission MSK
Note 1)
@MOD
signal distortion
1.2kHz si~nal outDut
max
2.0
typ
-lo
3.5
-4.5
-3.5
-2.5
-2.5
-20
-24
-17.0
-20.0
-14
-16
-36.5
dB
-35
dB
-2.5
dBx
-32
dB
min
-4.5
-3.5
Unit
dBx
dB
5.0
-
dBx
dBm
2) RX system
Parameter
max
Standard input level @RXINO
Absolute gain
RXINO~BUFON, BUFOP
0
-1.5
Note 1)
RXINO-BUFON, BUFOP
Expander linearity
Note 1) 4)
RXINO=-25dBx
-27.0
-33.0
-30.0
t
RXINO=-30dBx
-45.0
-40.0
-35.0
Noise with no input
RXINO-BUFON, BUFOP
-70
Xote 1) 3)
Expander distortion
RXINO~RXAF
RXINO=-5dBx
Reception MSK
@RXINO
signal level
1.2kHz signal output
T
Unit
I dBx
-L
dB
I
dBm
T
1996 12
0152-E-00
8
ASAHI KASEI
[AK2358FI
3 ) Overall characteristics
Parameter
Absolute gain TXIliO~BUFO!l, BUFOP
Note 5)
TXINO=-10dBx KEY=”O” or “l”
TXINO~BUFON,BUFOP Note 3) 5)
Distortion
TXINO=-10dBx KEY=”O” o r “ l ”
Crosstalk
Note 1)
@BUFON,BUFOP
Transmission ~ Reception
-f~=fto.
TXINO=OdBx
Crosstalk
Note 1)
@MOD
Reception * Transmission
6)
min
-0.5
6)
typ
0
max
+2. 5
Unit
dB
-50
-43
dB
-60
dBx
-56.5
dBx
7)
7)
4) Filter characteristics
Parameter
Transmission overall characteristics (See Fig.1)
TXINO ~ MOD
100Hz
TC=”O” EM=”l° PCONT=”l”
300Hz
Relative value with OdB gain
3kHz
a t lkHz
3. 4kHz
6kHz
Reception overall characteristics (See Fig.2)
RXINO ~ EXPOUT
100Hz
TC=”O” EM=”l° PCONT=”l°
250Hz
Relative value with OdB gain
300Hz
at lkHz
3. 4kHz
5kHz
min
typ
-12
8
8
-10.5
9.5
9.5
9
-12
12
10.5
-10.5
m ax
Unit
-40
-9
11
11
-12
dB
-4
13.5
dB
-9
-15
Note 1) With the external circuit shown in the application circuit example.
Note 2) Relative value with OdB as the MOD output level at the time of input of standard
input level (-10dBx) to TXINO.
Note 3) With the C-message filter.
Note 4) Relative value with OdB as the BUFON, BUFOP output level at the time of input of
standard input level (-10dBx) to RXINO.
Note 5) With the external circuit shown in the application circuit example.
Further, the AMP2 gain should be -3.5dB, and hfOD and RXIN should be in loop
connection.
Note 6) TC=’’ 1”, PCONT=”O”
Note 7) TC=’’O”, PCONT=”O”
Note 8) The dBx is standardized unit valid for various power supply voltages from 1.9 to
5.5V. If the voltage is 2Y, OdBx should be -5dBm. With the other voltage as X [V],
-5 } 20 log (X 2) dBml.
OdBx
0152-E-00
1996/12
-9-
ASAHI KASEI
[AK2358FI
•l Filter characteristics
GA IN(dB)
,~2
10’
Fig. 1
,03
,04
Transmission overall characteristics
FREQUENCY
GAIN(dB)
10
0
-lo
-20
-30
-40
-50
1 I
/
I
,02
Fig. 2
I
,~3
,04
FREQUENCY
Rc’ceptiorl overall characteristics
0152 E-00
10
-
1996/’l2
ASAHI KASEI
[AK2358FI
L e v e l
I
1) TX system
D i a g r a m
I
UK
MOdu I ator
f=lkHz
Uoo
~
TXINO
dB)
10
. . . . . . . .
0
-lo
...........
.......
.......
-al
.......... .
.
“--- . . . . . . . . . . . . . .
.
.
.
- 3 . SdBx(USK s i g n a l l e v e l )
-6.3dBx(reference l e v e l )
-Z3.WBX
-26.5,8X
-30
-40
.........
-60
.......................
I
....................
-70
. . . . . . t. . . . . . . . . . . . . .
.......................
-50
..........
-w
.....................
-90
.......................
2) RX system
f-1 kHz
DEM
RXINO
EXPOUT
RX*F
a~~’HO’;dBHp’’’;terH’’’”)=
BUFOP
-5,0
I -I
dBx
10
0
. . . . . . . . .
.
-10
-al
-25
.~
$dBx(max.
output level)
/
.
10
20
““
[..
/
-lo . . ...--”.....
“-..
‘- . . . .
.
. . . .. .. .
-4dBx(referenca I eve I )
22
-2
F
Ni
I
-40
-45
.34,Bx
~~~~~~
/
;
-44dBx
-50
~“
I
I
vote)
The dBx is standardized unit valid for var Ous pOwer supply vOltages frOm 1 . 9 tO
5.5V. [f the voltage is 2V, O d B x should be 5dBm. With the other ioltage as X [v:,
OdBx = 5 I 20 log (X 2) dllm:.
11
[AK2358FI
ASAHI KASEI
I
D i g i t a l
C h a r a c t e r i s t i c
s
I
1 . DC Characteristics
Parameter
High-1evel inuut voltage 1
l Low-level inDut voltaze 1
High-level input voltage 2
Low-level input voltage 2
High-level inuut current
l L o w - l e v e l inDut
current
–. –-–-—
--igh-level output voltage
Low-1evel outuut voltage
min
Pin
Symbol
70%VD+
I (1)
VIH1
I (1)
I v,,., I
I
/ 80%VD+ I
VIH2
(2)
VIL2
(2)
V,H=VD+
(l)(2)
IIH
V,,=OV
I
(1)(2)
I Ir, I ‘1O
I
90%VD+
I~H=O. lmA
(3)
VOH
‘“1~~=0.6mA
(3)
VOL
typ
“H-
m ax
Unit
v
I 30%VD+ I V I
v
\ 20%VD+I
v
10
] UA I
I
iuAl
‘v
0 . 3
v
(l). TDATA, DI/O
(2) SCLK, DIR
(3) TCLK, RDF, DI/O
2. AC Characteristics
Parameter
Master clock frequency
MSK Modulator timing
TDE Falling to TCLK Rising
TCLK period
TDE Rising to TXAFSW Falling
TDATA Set up time
TDATA Hold time
TDATA Hold time2
MSK Demodulator timing
RCLK Period & FD pules width
Serial data input timing
Clock pulse width 1
Clock pulse width 2
SDATA Set Up time
SDATA Hold time
DIR Set up time
DIR Hold time
DIR falling to SCLK falling time
SCLKi’DIR input rising time
SCLK/DIR input falling time
RDF falling to SCLK falling time
SCLK rising to RDF falling time
Symbol
fclk
T1
T2
T3
TS
TH
TH2
min
typ
3.579545
max
208.3
416.7
,uS
/!.Ls
ms
ps
ps
,uS
2
1
1
2
T
402.2
ta
tb
tc
td
te
tf
tg
th
ti
tj
tk
500
500
100
/ls
416.7
100
100
100
100
1
1
100
600
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
,uS
,uS
ns
ns
1996/’12
0152-E 00
- 12
ASAHI KASEI
[AK2358FI
TCLK
TXAFSW N o t e )
( Internal register )
TDE
Note)
( Internal register )
[
I
::
TDATA
MOD
Voice signal
Voice signal
:
4
SCLK
ta
; tb :
\./
Y
~
. . . . . . . . . . . . . . . . ..~
DI/O
D7
..................
D1
do
)
DIR
+ +
{-------- 0.8DVDD
SCLKIDIR input
e) The timing to rewrite the internal registers TXAFSW and TDE is synchronized with the
falling edge of DIR.
13
[AK2358FI
\
1
1
....
1
1
1. . . . . .
+
w
*
n
k
*
... ,..
““
/
/
,‘
/
/’
.
~
:
z
x
x
w
CK
2
A:
v:
1
;
“ 14
[AK2358FI
ASAHI KASEI
I
C o n t r o l
R e g i s t e r
Map
I
■ Register composition
Address
A l AO
Control register 1
Volume register
Volume register
Control register 2 +
volume register
I Reception data register
D7
D6
D5
Data
D4
D3
0
0
FSL
0S2
BS1
FCLN
PCONT
o
1
1
0
1
1
1
1
RECSW
1
1
TC
FRPT
KEY
VR2
EM
D1
DO
TXAF RXAF
TDE
‘SW
-Sw
VR4
VR1
D2
VR3
MSK MODEhl reception data
The reception data register is a read only register. and the others are write only
registers.
The reception data register has no address information proceeding to the Data.
Set the all bits D4 to D7 of volume register address “01” to “l”. If they are set to “O”,
it changed to test mode.
■ Register
❑ ap
1) Control register 1
Address
A l AO
o
0
(Default)
Data
D?
FSL
1
D6
BS2
1
D5
BS 1
0
D4
FCLN
0
D3
PCONT
1
D1
TXAFSW
0
D2
TDE
1
DO
RXAFSW
0
a) Transmission signal control
TXAFSW
0
1
TDE
1
1
o
I
I
1
II
Transmission output
Voice signal
h[ute
MSK simal
I
b) Reception signal control
I
I
RECSW
RXAFSW
1
I
o
II
1
0
o
RXAF
hlute
0s
0s
[ BUFOP/BUFON I
Nute
I
I
Mute
ON
c ) Scrambler circuit OY OFF
[
PCONT
1
o
!I
I
I
1
Bypass (Scrambler OFF)
Scrambler works (ON)
1996 12
0152-E-00
-15-
[AK2358FI
ASAHI KASEI
d) Frame detection circuit ON/OFF
The frame detection function is not used (OFF).
The frame detection function is used (ON).
1
o
Note) FCLN automatically changes from O to 1 when a synchronized frame is detected.
e) Power-down mode
BS2
BS 1
hlode name
1
1
o
1
0
modeO
model
mode2
mode3
1
o
0
Voice system t
transmission MSK
OFF
OFF
OFF
ON
Reception MSK
Oscillator
OFF
OFF
ON
ON
OFF
ON
ON
ON
) RDF/FD selection
FSL
The MSK signal reception flag (RDF) is put out from the
RDF/FD pin.
The frame detection signal (FD) is ~ut out from the RDF/FD
pin.
1
o
2) Control register 2
Data
Address
Al AO
1
1
, (Default)
D7
TC
1
Data name
KEY
FRPT
EM
TC
I
D6
EM
1
D5
FRPT
0
D3
D4
KEY
1
1
\
D2
0
I D1 \
VR3
0
DO
0
Function
Carrier inverting frequency
“ 1 “: 3.496kHz
“O”: 3.729kHz
Frame detector detection pattern “l”: 1100010011010110 (base unit)
“o” :
1001001100110110 (portable unit)
Emphasis circuit
“ 1 “: Passage (ON)
“O”: Bypass (OFF)
“ 1 “: Passage (ON)
COMPANDOR circuit
“O”: BvDass (OFF)
3) Volume register
Address
A l AO
o
1
1
0
1
1
Data
D7
1
VR23
TC
D6
1
YR22
EM
D3
1
YR21
f’RPT
D4
1
VR20
KEY
D3
RECSW
VR13
VR33
-16-
D2
VR42
VR12
VR32
D1
VR4 I
\’Rl I
VR31
DO
VR40
VR1O
VR30
I
ASAHI KASEI
[AK2358FI
a) VR1 volume control
VR13
o
0
0
0
o
0
0
o
1
1
1
1
1
1
1
1
VR12
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VRII
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VR1O
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
VR22
VR21
VR23
VR32
VR31
VR33
o
0
0
0
0
0
101011
o
0
1
0
o
1
0
1
0
o
1
1
VR20
VR30
0
1
Volume gain (dB)
–8. O
–7. o
–6. O
– 5 . 0
–4. o
–3. o
– 2 . 0
– 1 . 0
0
+ 1 . 0
+2. o
+3. o
+4. o
+5. o
+6. O
+7. o
b) VR2, VR3 volume control
101
11
1
1
11
1
1
1
11
I
0
1
1
0
0
1
I
0
1
1
1
1
1
I
–4.
–3.
–3.
– 2 .
–2.
– 1 .
– 1 .
– 0 .
1
0
#101
1
0
1
0
1
0
Volume gain (dB)
0
1
10101
0
1
I
1
(-1
o
5
o
5
o
5
0
5
+1.0
+1.5
+2. o
+ 2 . 5
+3 n
1996, 12
0152-E--OO
1 7
ASAH 1 KASEI
c ) VR4 volume control
I
!
VR42
VR41
o
0
0
o
o
o
1
1
1
1
0
1
1
0
0
1
0
1
0
1
1
0
1
1
\
VR40
I
Volume ~ain (dB)
–;2
– 9
–6
–3
0
+3
+6
+9
I
I
Note) By reset, the gain of all volumes are set to OdB and RECSW bit is changed
to “o”.
4) MSK MODEM reception data
I
I
I
D7
RD7
I D6 IDS I
RD6
RD5
Data name
RDO
t
RD7
Data
D4 \ D3
RD4
RD3
I
]D2 I D1 I
RD2
RD 1
DO
RDO
Function
“1’’: l.2kHz
“O” :2. 4kHz
MSK reception data
RD7 is the first received data.
0152-E-00
1996 [2
- 18
ASAHI KASEI
[AK2358FI
MSK
I
I
Modem
MSK signal transmission flow
MSK signal transmission
W
MSK transmission data
are transmitted
synchronized to TCLK.
: MSK transmission start
: During MSK transmission
Transmission of the
N
I
TDE= “1”
I
: MSK data transmission completion
WAIT for 2 ms or more
T
TXAFSW = “O”
: Switching to voice signal
A
(1) Set the serial register “TDE” to “O” and “TXAFSW” to “l”, so that lISK transmission
state is provided.
(2) A 2400Hz clock is put mt from TCLK. Synchronizing with the rising edge of TCLK,
AK2358F reads the MSK transmission data from TDATA pin and put out them 10 MOD pin.
(3) After the transrniss!on of the necessary number of signal bit, “TDE” of the serial
register is set to l“.
(4) Afterwards, before switching to a voice signal transmission mode, wait at east 2ms
after “TDE” has set to “l” to complete the MSK signal final bit transmission.
Then set TXAFSW register to “O”.
1996/12
0152-E-00
“ 19
ASAHI KASEI
[AK2358FI
MSK Signal Reception
USK signal r e c e p t i o n
d=
FSL set to “O”.
N
: S e t s o t h a t a frase d e t e c t i o n s i g n a l ( F D ) i s p u t o u t fros
t h e RDF/FD p i n .
: Synchronization frame detection?
: Reception voice ❑ u t e
RXAFSW = “1”
I
7
FSL set to “ 1”
: S e t s o t h a t a n NSK s i g n a l r e c e p t i o n f l a g (RDF) i s p u t o u t
from t h e RDF/FD p i n .
N
: Reception of 8 bit of data?
: R e a d i n g o f 8 b i t o f d a t a . c h a n g e t o RDF/FD = “ H ”
Reception data read i ng
II
FCLN set to “O”
I
: Waiting for t h e n e x t s y n c h r o n i z a t i o n
frame
I
A
(1) If the internal register “FCLN” is “O”, the internal nodes RDATA, RCLK are fixed to
“l”.
(2) After a synchronization frame is detected, FD goes to “L” during the period “T”, then
FCLN is set to “l”.
(3) RDATA and RCLK put out the data following to the synchronized frame pattern, and these
are stored in the internal buffer.
(4) After 8 bit of reception data have been entered to the internal buffer, RDF goes “L”.
(5) After the CPU detect that RDF is “L”, it puts out 8 clock bits to SCLK, then read 8
bit of reception data from the SDATA pin.
(6) with input of 8 clock bits to SCLK, RDF goes “H”.
(7) Afterwards, by repeating the steps (4) and (5) the necessary data bits are read.
(8) After the necessary data have been read, DIR goes “H”, “FCLN” is set to “O” via the
serial interface, the internal nodes RDATA and RCLK are set to “l”, then the system
waits for lhe next synchronization frame.
0152-E-00
1996/12
-20”
ASAHI KASEI
[AK2358FI
I
A p p l i c a t i o n
C i r c u i t
E x a m p l e
I
■ Application Circuit
OAMP 1
Use as a transmitting microphone amplifier.
The gain should be less than 30dB. To
eliminate high frequency noise component over than 100kHz from input signal, Ist order
or 2nd order anti-aliasing filter is necessary. The following drawing is one example of
the 2nd order anti-aliasing filter, which has 30dB gain and 10kHz cut-off frequency.
\/ .J
TXINO
~3
C1=2200PF
f\)
A
C2=33PF
TXINR2
&
AMP1
Rl=R2=10k Q
cl
R3-330k Q
<
L S I
@3moothing filter for MOD output signal
Realize low-pass filter to eliminate l12kHz clock signal component from MOD pin
output signal. The following is one example of the 1st order low-pass filter which has
8.7kHz cut-off frequency. 10kQ of the modulator load resistor(RL) provide 3.3dB signal
attenuation.
C2
R
R=3.9k 52
MOD
-T
‘ll
‘L
T
=
cl=4700pF
CZ=OI~F
RL=lOk Q (Load resistance of MOD)
0AMP2
The amplifier for the receiving gain adjustment and anti-aliasing filtering to
eliminate high frequency noise component over 100kHz. The gain should be less than 30dB.
The following is an example of the 2nd order low pass filter, which has 20 dB gain and
40kHz cut-off frequency.
RXINO
C1=560PF
C2=27pF
Rl=lOkQ
R2=9. lkQ
AMP2
R3=100k Q
<
L S I
0152-E-00
1996, 12
- 21
ASAHI KASEI
[AK2358FI
0AMP3
The smoothing filter to eliminate 448kHz clock component from EXPOUT signal is
provided by this amplifier. Also it works to adjust the receiving gain.
Adding the
other pass signal may be possible. The following is one example of the 1st order low-pass
filter, which has OdB gain , 19kHz cut-off frequency.
EXPOUT
C2 RI
Cl=150pF
C2=0 .022 pF
Rl=R2=56k Q
RXAFIN
R2
c1
@
RXAF
++
AMP3 L S I
OAGNIl stabilizing capacitor
To stabilize the AGND potential, connect capacitors larger than 0.3KF between TACND
pin, RAGND pin and AVSS pin. Also between AGNDIN pin and AVSS pin some capacitor is
necessary to reduce the ripple of the power.
C-1 /iF
L S I
QVDD stabilizing capacitor
To reduce the noise on VDD, connect capacitors between VDD and VSS.
VDD
C1-22,UF
VDD
cl
+
C2
(Aluminium Electrolytic Capacitor)
C2-O.l~F (Ceramic Capacitor)
Vss
b
<
L S I
0152-E-00
1996 12
22
[AK2358FI
ASAHI KASEI
OCrystal oscillator
- Crystal resonator , resistor and capacitors should be connected as shown Fig.3 for
on-chip oscillator operation.
- For external clock operation, if the high(H) level of the input clock signal
amplitude equals to or is greater than 1.5V, and the low(L) level equals to or is
smaller than 0.5V, then connection should be made as shown in Fig.4.
If the input clock signal amplitude (peak-to-peak) equals to or is smaller than
lV, and equals to or is greater than 200mV, then AC coupling should be as
illustrated in Fig.5.
1=
XIN
FXIN
22pF
XOUT
3.58MHz
lM i
22pF
*
-
External clock signal
Fig.4
Fig.3
IT
r
XIN
O.Ol#F
~External clock signal
lM Cl
XOUT
fig.5
OLimit level adjusting resistor
The limiting level can be controled externally by applying DC voltage to LIMIV pin.
Applied DC voltage should be larger than TAGND, then the limiting level is shown as
TAGND*Va(V), while Va is the voltage between LIMIV and TAGND. Keeping LIMIV pin open
provides default limit level. See following exampleVDD
LIMLV
R=50k .$2
R
.+:
Vss
L S I
1996/]2
0152-E-00
-23-
ASAHI KASEI
I
[AK2358FI
I
P a c k a g e
■ Marking
[Contents of XXXYZ]
XXX: Date of manufacture
Last digit of the year, week number of the year as 2 digits
Y: Production lot number
Z: Assembled place
■ Shape and dimensions of the package
24 pin VSOP
Unit: mm
7.8%;
2
IUIUURUUURU[
3
o
0.2
Q@@4L
0.65
+
q
.
_
‘K
*
--i !=
T-FCUN
0
Note:
Dimensions marked by *
do not include residual resin.
& 0-10”
D e t a i l of p a r t
Ma
eriall Resin: Low-stress
Lead frame: Cu
0152-E-00
A
t y p e epoxy resin
1996;12
24
-,
IMPORTANT NOTICE
. These products andtheir specifications aresubject tochange without notice. Before considering anyuseorapPfiCatiOn,
consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current
status.
. AKM assumes noliabili~ forinfringernent ofanypatent, intellectual property, orotherright in the application or use of
any information contained herein.
. Any export of these products, or devices or systems containing them, May require an export license or other official
approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange,
or strategic materials.
. AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other
hazard related device Or system, and AKM assumes no responsibility relating to any such use, except with the express
written consent of the Representative Director of AKM. As used here:
(a) A hazard related device or system is one designed or intended for life SUppOfl or r-maintenance of safety or for
applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may
reasonably be expected to result in IOSS of fife or in significant injury or damage to person or property.
(b) A critical component is one whose failure to function or pedorm may reasonably be expected to result, whether
directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must
therefore meet very high standards of pefiormance and reliability.
● It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise plaCeS the
product with a third party to notify that pa~ in advance of the above content and conditions, and the buyer or distributor
agr@eS tO aSSUMe ally and all responsibility and liability for and hold AKM harmless from any and all C]aiMS afiSing frOn’1
the use of said product in the absence of such notification.