ASAHI KASEI
[AK2358FI
Base-band 1S1 for kopian Cordless Telephones(CTl, CT1+)
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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
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Low / wide operation voltage range (1.9 V to 5.5V)
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Built-in COMPANDOR output transient response circuit and time constant circuit
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No external component is needed for COMPANDOR
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Built-in buffer amplifier for ceramic receiver driving.
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Built-in electronic volume for microphone sensitivity and modulator/demodulator
sensitivity
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Receiving level switchable in 8 steps (-12 to +9dB)
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Built-in
u
uting function for voice transmitting and receiving
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External adjustment for the limiter level
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Built-in amplifier for transmission and reception gain adjustment
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Low power CMOS and power-down function
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Built-in 3.58MHz oscillator circuit
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Scrambler circuit with frequency inversion. Two inversion frequencies can be
selected.
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Bypassing the scrambler circuit available
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Built-in frame detection function for the MSK demodulator
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Control register and MSK MODEM data buffer controlled by serial interface
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Few external component is necessary resulting cost reduction and small set size.
El
Package: 24 pin VSOP
B l o c k
D i a g r a m
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splatter f i lter
Transmission s i g n a l
output
IT D a t a / R x D a t a
Control data
(
3 .58NHz
\ 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
AKM [ ASAHI KASEI MICROSYSTEMS ]
