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PDF AK2358A Data sheet ( Hoja de datos )
| Número de pieza | AK2358A | |
| Descripción | Base Band LSI | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK2358A (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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ASAHI KASEI
[AK2358AI
i Features 1
•1 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 u icrophone sensitivity and modulator/demodulator
sensitivity
u Receiving level switchable in 8 steps (-12 to +9dB)
•1 Built-in muting function for voice transmitting and receiving
•1 External adjustment for the limiter level-
u Built-in amplifier for transmission and reception gain adjustment
•1 Low power CMOS and power-down function
u Built-in 3.58MHz oscillator circuit
•1 Scrambler circuit with frequency inversion. Two inversion frequencies can be
selected.
•1 Bypassing the scrambler circuit available
u Built-in frame detection function for the MSK demodulator
•1 Control register and MSK MODEM data buffer controlled by serial interface
•1 Few external component is necessary resulting cost reduction and small set size.
u Package: 24 pin VSOP
1 Block Diagram I
microphone input
T% D a t a / l x D a t a
Control data
frase d e t e c t i o n
Receiver
Transmission signal
output
3. 58MEz
Receptlnn s i g n a l
Input
0151 E-00
Recept 100 o u t p u t
-1
1996 12
1 page  
ASAHI KASEI
[AK2358AI
Block
AMP3
7
r
AGND
Oscillation
circuit
VR1
PVR2
VR3
rVR4
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 +3.5dB 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
Pin No.
1
2
3
4
5
Pin name
ACNDIN
TAGND
TXIN
TXINO
LIMLV
Pin/Function
I
1/0
I
o
I
o
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 ex~ernal
resister and a capacitor.
.4i111 output pin.
Limitation level adjustment pin.
The limitation level can be adjusted by applying a
I)C vollagc’ to this pin. The default limitation level
is adopted if no voltage is applied.
0151 ”E-00
1996 12
5 Page 
ASAHI KASEI
[
1) TX system
TXAF
f-lkHz
TXINO
Pref i I ter
(AUP1)
OS30dB
O:jdB
Level Diagram
UK
klodul ator
~
MOD
H~ddE3+w:i.H AUP j-=
Cross point
-lOdBx
Limiter level
-ldh
0:: “~dB
+3.5dB
.Scraable
[AK2358AI
I
2) RX system
f-1 kHz
RXINO
....................
.. . .. .. ..
..
..
..
.
.
.
.
.
.
.
.
.
.
....
.
.
...............
$.5
..................
-3. SdBx(USKs19nsl level)
-6.3dBx(referencs level)
14
...............
-23.5dBx
-Z6.sdnx
. . . . . . . . . . . . . . . . . . . . .,
...................
......................
....................
......................
.....................
EXPOUT
RXAF
‘“~PJ:’Ho:~dBH’’’4’’”r=’c:’
-b.&t-
dBx
10
0.
-10 ~~
...
....
-23
-25
-20
I
-4, /
-45 j /
-50 /
-44d0x
I I “ “’””
Note) The dtlx is standardized unit valid for various power supply voltages from 1.9 to
5.5V. [f lhe voltage is 2V, OdBx should be 5dBm. With the other voltage as X [V],
OdBx 5 ~ 20 log (X/2) [dBml.
0151-E 00
11 “
1996/’12
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AK2358A.PDF ] | |
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