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PDF U3600BM Data sheet ( Hoja de datos )
| Número de pieza | U3600BM | |
| Descripción | SINGLE CHIP CORDLESS TELEPHONE IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• All Functions and Channel Selections are Controlled by Serial Bus
RF Part
• All Oscillators and PLL Integrated
• IF Converter
• FM Demodulator
• RSSI
Low Frequency Part
• Asymmetrical Input of Microphone Amplifier
• Asymmetrical Output of Earpiece Amplifier
• Compander
• Power Supply Management
• Serial Bus
Application
• CT0 Standard
• Narrowband Voice and Data Transmitting/Receiving Systems
Single-chip
Cordless
Telephone IC
U3600BM
Description
Preliminary
The programmable single-chip multichannel cordless phone IC includes all necessary
low frequency parts such as microphone- and earphone amplifier, compander, power-
supply management as well as all RF parts such as IF converter, FM demodulator,
www.DataSheet4U.comRSSI, oscillators and PLL. Several gains and mutes in transmit and receive direction
are controlled by the serial bus. The compander can be bypassed.
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Rev. 4516C–CT0–08/02
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U3600BM
System Description
Radio frequency IC for analog cordless telephone application in 26/50 MHz band (CTO
standard). The IC performs full duplex communication. The transmitting and receiving
frequency are depending on whether the IC is used in the handset or in the base station.
Frequency converter comprise an FM transmitter with switchable output power and first
receiver mixer in the same unit. A two-wire bus interface can be used for the frequency
control as well as for switching the transmitter power amplifier and the receiver. Fine
frequency adjust of reference quartz 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 crystal oscillator (LO1).
The transmit part contains two PLL controlled VCOs. The frequency modulation is
accomplished by super-posing the incoming audio signal on the PLL control voltage.
Final frequency is a product of mixing VCO1 with first local oscillator of receiver part
(VCO3). The FM modulated carrier is amplified by externals power amplifier before
entering the output filter and the antenna connector.
Adjustments for VCO1
and VCO2
To be able to use a wide frequency range for the VCOs (i.e., VCO2 26.3 MHz to
49.9 MHz) the two internal VCOs (VCO1 and VCO2, i.e., the VCOs of the transmit part)
have a rough adjust and a fine adjust to increase the frequency range given by the
phase comparator.
The rough adjusts for these VCOs are correlated with the country setting. For every
country there are two sets of VCO rough adjust settings, one for the base and one for
the handset. See tables at channels frequencies and dividers.
www.DataSheet4U.comTo compensate the variation in production there is a fine adjust for each of the VCOs.
The fine adjusts of the internal VCOs could be set manually (for test purposes) or set by
the automatic mode. Theoretically the sign of the changing (increase/ decrease when
the voltage of the phase comparator is to high) is selectable, but we need value 1 () in all
cases.
Setting VCO1 (VCO2) under normal conditions:
EAFA1 (EAFA2) = 1, automatic fine adjust VCO1(VCO2) enabled
SAFA1 (SAFA2) = 1, sign of auto fine adjustment of VCO1 (VCO2) = 1.
Adjustment for VCO3
In order to increase the adjustment range of VCO3 with fixed external tank elements
and/or for “band switching”, especially for US frequencies, VCO3 has programmable
capacitors inside. These capacitors can be added by serial bus (FA3 [4:0]) between LO1
and LO2. There are 31 steps available, every step adding a capacitor of 0.5pF.
Speed-up of the Loop
Filter of PLL1
(“Modulator PLL”)
To have a fast locking time for the modulator loop there is a precharge and a speed-up
mode for the external loop filter.
During receive mode (VCO3 enabled, VCO1 disabled) the modulator loop filter is
precharged to about half of the internally regulated 2.5 V charge-pump voltage.
During the first 30 ms after enabling VCO1 the modulator phase comparator is in speed-
up mode. In this mode the current of the pase comparator which charges the loop filter
is much larger than in normal mode. Additionally to the automatically switched 30 ms
speed-up mode, the speed-up can be activated for any time by setting the bit SU1.
4516C–CT0–08/02
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U3600BM
Absolute Maximum Ratings
Parameters
Supply voltage
Junction temperature
Ambient temperature
Storage temperature
Power dissipation Tamb = 60°C
Symbol
VBatt, VDD
Tj
Tamb
Tstg
Ptot
Value
5.5
+125
–25 to +75
–50 to +125
0.9
Unit
V
°C
°C
°C
W
Thermal Resistance
Parameters
Junction ambient SSO44
Symbol
RthJA
Value
70
Unit
K/W
Electrical Characteristics
Tamb = +25°C, VRF = VAF = RFOVB = 3.6 V, all bits set to “0”, unless otherwise specified.
Test circuit, see Figure 7. Crystal specifications, see table “Crystal Specifications”.
Parameters
Test Conditions
Symbol Min.
Power Supply
Operating voltage range
3.1
Current Consumption
Operating current in inactive
www.DataSheet4U.commode (low voltage)
VRF = VAF = RFOVB = 2.9 V
VDD = 0 V
30
Operating current in standby
mode
VRF = VAF = RFOVB = 3.6 V
30
Operating current in RX mode ERXHF = EVCO3 = EOSC = 1
“waiting for RSSI”
Operating current in RX mode ERXHF = EVCO3 = EOSC = ERX1
“receiving data”
= ERXO = 1
Operating current in
conversation mode: all blocks
enabled
ERXHF = EVCO3 = EOSC = ERX1 = ERXO
= ERX2 = EEA = EVCO2 = ETXO = 1
no load at RFO Pin 3
Charge Pump of LL1
Charge pump output voltage Output high
2.38
Precharge voltage at the loop SB127 = 1, SB119 = 0
filter
1.15
Charge pump output current in VMLF = 1.25 V, output low
speed-up mode
VMLF = 1.25 V, output high
190
-400
Charge pump output current VMLF = 1.25 V, output low
4.3
VMLF = 1.25 V, output high
-8
Charge pump leakage current VMLF = 1.25 V, output tristate
-150
Charge Pump of PLL3
Charge pump output voltage Output high
2.38
Charge pump output current in VPCLO = 1.25 V, output low
speed-up mode
VPCLO = 1.25 V, output high
220
-420
Typ.
3.6
65
100
7.5
8.5
20
2.5
1.4
6.2
-6.2
2.5
Max.
5.2
85
350
10.4
11.5
29
2.63
1.65
400
-190
8
-4.3
+150
2.63
420
-220
Unit
V
µA
µA
mA
mA
mA
V
V
µA
µA
µA
µA
nA
V
µA
µA
4516C–CT0–08/02
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