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AD6411 Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD6411
Descrição Electrónicos  DECT RF Transceiver
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD6411 Folha de dados(HTML) 10 Page - Analog Devices

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AD6411
–10–
REV. 0
UHF VCO Tank Circuit
The UHF VCO is probably the most critical part of an AD6411-
based DECT radio. The design shown in Figure 5 uses a
printed inductor, a BBY53 (or equivalent) common-cathode
dual varactor, and a PIN-diode (BAR63-03W or equivalent)
band switch to cover the DECT band. The capacitance added
to the tank circuit by the PIN-diode is needed to switch the VCO
to the DECT receive band. It is switched out of the circuit in the
transmit mode, in which the VCO is directly modulated by
baseband transmit data. With this scheme, no manufacturing
trim is needed to tune the VCO to the DECT band. Tank com-
ponent values will need slight modification to cover the “ex-
tended DECT” frequency bands. The dimensions of tank
inductor L1 will depend on the circuit board material and thick-
ness used. Contact Analog Devices for assistance on UHF tank
inductor layout.
2pF
20k
20k
8.2pF
8.2pF
10k
BAR80
BAR63-03W
2k
L1
6.8pF
1nF
6.8k
2k
330pF
10k
10k
1.2pF
2pF
VCCVCO
VCOB
BSW
VCO
LF
AD6411
TX
DATA
IN
Figure 5. UHF VCO Circuit
Power Management
The AD6411 reduces the external components needed for
power management in a DECT radio by integrating voltage
regulators on-chip. The circuit can therefore operate directly
from a 3.0 V to 5.5 V unregulated battery supply.
There are two regulators. The first, VS1 (Pins 20, 21 and 23),
uses an external BCW68F (or similar) PNP pass transistor to
provide a regulated 2.75 V nominal supply voltage to most of
the AD6411 circuitry. The second regulator, VS2 (Pins 41, 44,
and 45), is intended to provide the regulated voltage to the
UHF VCO section and should not be used for other circuitry.
REGULATOR #1
REGULATOR #2
10nF
10nF
VBAT
VBAT
10nF
10pF
1nF
PASS TRANSISTORS: BCW68F OR EQUIVALENT
TO PIN 40 (VCOB)
AD6411
Figure 6. Voltage Regulator Circuitry
Transmit/Receive Switching
Since the same antenna is used for both transmit and receive, a
switch consisting of PIN diodes and printed transmission lines is
used to disconnect the receive path from the antenna during
transmit periods. A suggested circuit is shown in Figure 7.
Complete details can be found in Siemens Application Note
No. 007.
FROM PA
BAR63-03W
ANT
50
27nH
47pF
470pF
TX/RX
1=TX
0=RX
TO RX IN
BAR80
/4
Figure 7. T/R Switch


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