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TEMIC Semiconductors - Low-Power FM Transmitter

Numéro de référence U3550BM
Description Low-Power FM Transmitter
Fabricant TEMIC Semiconductors 
Logo TEMIC Semiconductors 





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U3550BM fiche technique
U3550BM
Low-Powerwww.DataSheet4U.com FM Transmitter / Synthesizer System 26 to 50 MHz
Description
The U3550BM is a radio-frequency IC for analog
cordless telephone applications in the 26/50-MHz band
(CTO standard). The IC performs full duplex communi-
cation. The transmitting and receiving frequency depends
on whether the IC is used in the handset or in the base
station.
The U3550BM’s frequency converter consists of an FM
transmitter with switchable output power and receiver
Mixer 1 in the same unit. A two-wire bus interface can be
used for frequency control as well as for switching the
transmitter’s power amplifier and the receiver. Fine
frequency adjustment of the reference crystal oscillator is
programmable.
The receive part is designed for a double-conversion
architecture. The incoming radio-frequency signal will
be filtered and amplified before reaching the first mixer.
At this stage, the RF signal will be converted down to the
first intermediate frequency (10.7 MHz) by using a local
adjustable oscillator (VCO3). The frequency of this
oscillator is controlled by the PLL.
The transmitter part contains two PLL-controlled VCOs.
The frequency modulation is accomplished by
superposing the incoming audio signal on the first PLL
control voltage. In this system, the frequency is a product
of mixing VCO1 with local oscillator (VCO3). The FM-
modulated carrier is amplified by external power
amplifier before entering the output filter and the antenna
connector.
Features
D All PLLs and most of the oscillators are integrated
D All functions and channel selection controllable by
serial bus
D Receiver Mixer 1 with integrated image rejection
D Up to 25 channels selectable depending on CT0
standard
D Integrated oscillator circuit with external crystal
(11.15 MHz)
D Programmable carrier-modulation frequency
Application
D CT0 (USA, France, Spain, Netherlands, Portugal,
Korea, Taiwan, New Zealand, China)
D Narrowband voice and data transmitting / receiving
systems
Block Diagram
VBAT DELVB DELGND MIXO LOGND PCLO
OSCVDD MCKA OSCGND
VCC
MIXIN
MIXVB
LO1
LO2
VTX
RFOVB
RFO
RFOGND
Mixer 1
+ 45
– 45
10.7 MHz
sin
VCO 3
sin
cos
2
cos
Mixer 2
+ 45
– 45
N
Phase
comparator
11.15 MHz Oscillator
interface
K 20
557.5 KHz
Serial BUS
interface
XCK
MCKO
C
D
D 1 D 2 VCO 1
2
D3
P
GREF
VCO 2
Loop
filter
Phase
comparator
Phase
comparator
LFGND
AGND
VSS
MODIN
Figure 1. Block diagram
MLF
13280
Rev. A2, 10-Sep-98
Preliminary Information
1 (25)

PagesPages 25
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