U3550BM MHz Datasheet

U3550BM Datasheet, PDF, Equivalent


Part Number

U3550BM

Description

Low-Power FM Transmitter / Synthesizer System 26 to 50 MHz

Manufacture

TEMIC Semiconductors

Total Page 25 Pages
Datasheet
Download U3550BM Datasheet


U3550BM
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)

U3550BM
U3550BM
Pwiwnw.DDateaSshcereit4pUt.cioomn
MCKO 1
28 VCC
D2
27 VSS
C3
26 MCKA
OSCGND 4
25 MODIN
XCK 5
24 LFGND
OSCVDD 6
DELVB 7
DELGND 8
23 MLF
22 VBAT
21 AGND
GREF 9
20 VTX
MIXIN 10
MIXVB 11
19 RFOVB
18 RFO
MIXO 12
17 RFOGND
LO1 13
16 LOGND
LO2 14
15 PCLO
11623
Figure 2. Pinning
Order Information
Extended Type Number
U3550BM-AFL
U3550BM-AFLG3
Package
SO28
SO28
Pin Symbol
Function
1 MCKO Clock output for peripherals
2 D Data input of serial bus
3 C Clock line of serial bus
4 OSCGND Oscillator ground
5 XCK Oscillator input (11.15 MHz)
6 OSCVDD Oscillator supply input
7 DELVB Phase correction VCO3 supply
input
8 DELGND Phase correction VCO3 ground
9 GREF Voltage reference for internal
current sources
10 MIXIN Mixer input
11 MIXVB Mixer-supply input
12 MIXO Mixer output
13 LO1 Tank elements for LO are
14 LO2 connected to these pins
15 PCLO Phase comparator PLL3 output
16 LOGND VCO3 ground
17 RFOGND RF transmit output ground
18 RFO RF transmit output
19 RFOVB Power-supply input of RF
transmit output buffer
20 VTX Power-supply output of RF
external power amplifier
21 AGND Analog ground
22 VBAT Power supply of analog part
23 MLF Modulator loop filter
24 LFGND Modulator loop-filter ground
25 MODIN Modulator input signal
26 MCKA Peripheral-clock output
adjustment
27 VSS Digital ground
28 VCC Power supply of digital part
Remarks
Taped and reeled
2 (25)
Rev. A2, 10-Sep-98
Preliminary Information


Features U3550BM www.DataSheet4U.com Low-Power F M Transmitter / Synthesizer System 26 t o 50 MHz Description The U3550BM is a r adio-frequency IC for analog cordless t elephone applications in the 26/50-MHz band (CTO standard). The IC performs fu ll duplex communication. The transmitti ng and receiving frequency depends on w hether the IC is used in the handset or in the base station. The U3550BM’s f requency converter consists of an FM tr ansmitter with switchable output power and receiver Mixer 1 in the same unit. A two-wire bus interface can be used fo r frequency control as well as for swit ching the transmitter’s power amplifi er and the receiver. Fine frequency adj ustment of the reference crystal oscill ator is programmable. The receive part is designed for a double-conversion arc hitecture. The incoming radio-frequency signal will be filtered and amplified before reaching the first mixer. At thi s stage, the RF signal will be converte d down to the first intermediate frequency (10.7 MHz) by using a lo.
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