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PDF ( 数据手册 , 数据表 ) U3550BM

零件编号 U3550BM
描述 Low-Power FM Transmitter
制造商 TEMIC Semiconductors
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U3550BM 数据手册, 描述, 功能
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 pdf, 数据表
U3550BM
Rw1w1w: .SDeatttaiSngheVetC4UO.c2oamnd VCO3
free free FRMT free
FRMT: Output frequency range of Mixer T
AMIX[2:1]: Lengthening anti-backlash signal mixer loop
RA2[1:0]: Rough adjustment VCO2
AMIX2
AMIX1
RA21
RA20
R12: Divider for country setting, fine adjust oscillator
FAOS2
FAOS1
FAOS0
D31
D30
D20
D11
D10
FAOS[2:0]: Oscillator fine adjust
D3[1:0]: Setting divider D3
D20: Setting divider D2
D1[1:0]: Setting divider D1
R13: VCO1 enable and fine adjust
EVCO1
SAFA1
EAFA1
FA14
EVCO1: Enable VCO1
SAFA1: Sign for automatic fine adjust VCO1
EAFA1: Enable automatic fine adjust VCO1
FA1[4:0]: Fine adjust VCO1 for manual adjustment
FA13
FA12
FA11
FA10
R14: VCO2 enable and fine adjust
EVCO2
SAFA2
EAFA2
FA24
EVCO2: Enable VCO2 and Mixer T
SAFA2: Sign for automatic fine adjust VCO2
EAFA2: Enable automatic fine adjust VCO2
FA2 [4:0]: Fine adjust VCO2 for manual adjustment
FA23
FA22
FA21
FA20
R15: VCO3 enable, oscillator enable, selection of phase comparator VCO3 and speed-up phase comparator for VCO3
EVCO3
EOSC
SU3
E25K
E12K5
E10K
E6K25
E5K
EVCO3: Enable VCO3 and Mixer 1
EOSC: Enable oscillator
SU3: Speed-up phase-comparator for VCO3
E25K: Selection phase-comparator frequency VCO3: fRef3 = 25 kHz
E12K5: Selection phase-comparator frequency VCO3: fRef3 = 12.5 kHz
E10K: Selection phase-comparator frequency VCO3: fRef3 = 10 kHz
E6K25: Selection phase-comparator frequency VCO3: fRef3 = 6.25 kHz
E5K: Selection phase-comparator frequency VCO3: fRef3 = 5 kHz
E5K, E6K25, El0K, El2K5, E25K = 0 Selection phase-comparator frequency VCO3: fRef3 = 2.5 kHz
8 (25)
Rev. A2, 10-Sep-98
Preliminary Information







U3550BM equivalent, schematic
U3550BM
Nwwetwh.DeartalaSnhedest4UC.cTom0 Base Set
Country setting:
Name
Value
Setting
RA1[1:0]
10
mid
RA2[1:0]
10
low
D1B[1:0]
00
2
D2B0
1
8
D3B[1:0]
11
4
KV2[3:1]
100
GMOD[1:0]
10
high
IMIXI
1
infra
UDM1
0
infra
FRMT
0
low
Channel frequencies and 1st LO divider, fRef3 = 6.25 kHz
Channel Number
RX Channel Frequency (MHz)
1 39.9375
2 39.9625
3 39.9875
4 40.0125
5 40.0375
6 40.0625
7 40.0875
8 40.1125
9 40.1375
10 40.1625
11 40.1875
12 40.2125
1st LO Frequency (MHz)
29.2375
29.2625
29.2875
29.3125
29.3375
29.3625
29.3875
29.4125
29.4375
29.4625
29.4875
29.5125
N
4678
4682
4686
4690
4694
4698
4702
4706
4710
4714
4718
4722
Netherlands CT0 Handset
Country setting:
Name
Value
Setting
RA1[1:0]
10
mid
RA2[1:0]
01
high
D1B[1:0]
00
2
D2B0
1
8
D3B[1:0]
11
4
KV2[3:1]
001
GMOD[1:0]
10
high
IMIXI
0
supra
UDM1
1
supra
FRMT
0
low
Channel frequencies and 1st LO divider, fRef3 = 6.25 kHz
Channel Number
RX Channel Frequency (MHz)
1 31.0375
2 31.0625
3 31.0875
4 31.1125
5 31.1375
6 31.1625
7 31.1875
8 31.2125
9 31.2375
10 31.2625
11 31.2875
12 31.3125
1st LO Frequency (MHz)
41.7375
41.7625
41.7875
41.8125
41.8375
41.8625
41.8875
41.9125
41.9375
41.9625
41.9875
42.0125
N
6678
6682
6686
6690
6694
6698
6702
6706
6710
6714
6718
6722
Netherlands CT0 Modulation Loop Frequency and Divider
fmod = 1.8 MHz, P = 3, Q = 51
16 (25)
Preliminary Information
Rev. A2, 10-Sep-98










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