U3501BM Datasheet, PDF (1/20 Pages) TEMIC Semiconductors – Cordless Telephone Signal Processor

Cordless Telephone Signal Processor
U3501BM
Description
Cordless telephone signal processor reduces the need for
many external components.
Features
RF Receiver Part
IF converter, FM demodulator, RSSI-digital information
coding, transmit and receive part adjustable and mutable
by serial bus, compander, pre-/ de-emphasis, scrambler
with bypass function
LF Part
Microphone amplifier, earpiece amplifier, compander,
preemphasis, deemphasis, scrambler, descrambler,
digital power management, data management by FSK
Application: CT1, CT1P, 900 MHz USA standard
Package: SO28
Block Diagram
MIXIN
MIXGND
MIXO
IFIN1
ÁÁ
LOIN
OSCILATOR
11.15MHz
LOEXT
DIVI
Switched Cap.
Divider.
NC
VBAT
C
INTBUS
Serial
D
Bus
BATD
Battery low
detector
LPF
VCC TXO
IFIN2
DACO
RECDC
IFAMP
ÎÎÎÎÎÎ _LOG
RDEMO
Demodulator
RGAIN
ADJ
RSSI
LPF
Scrambler frequency
D/A
FSK
MODEM
Scrambler frequency
LPF
Modem
TGAIN
ÁÁÁÁÁÁ _ADJ.2
LIMITER
PFIL
GND
Figure 1.
LPF
DFIL
EXPANDER
RECOUT
RXO
ETC
EXIN
RECO2
RECO1
RXDAT
MIC
TGAIN
ADJ.1
COMPRESSOR
TXDAT
MIC1
MIC2
MICO
COIN
CTC
12386
TELEFUNKEN Semiconductors
1 (20)
Rev. A1, 29-Jul-96
Preliminary Information