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ADRF5020 데이터시트(PDF) 9 Page - Analog Devices

부품명 ADRF5020
상세설명  Microwave radios and very small aperture terminals
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Data Sheet
ADRF5020
Rev. A | Page 9 of 12
THEORY OF OPERATION
The ADRF5020 requires a positive supply voltage applied to the
VDD pin and a negative supply voltage applied to the VSS pin.
Bypassing capacitors are recommended on the supply lines to
minimize RF coupling.
The ADRF5020 is internally matched to 50 Ω at the RF
common port (RFC) and the RF throw ports (RF1 and RF2);
therefore, no external matching components are required. All of
the RF ports are dc-coupled to 0 V, and no dc blocking is required
at the RF ports when the RF line potential is equal to 0 V. The
design is bidirectional; the RF input signal can be applied to the
RFC port while the RF throw port (RF1 or RF2) is output or
vice versa.
The ADRF5020 incorporates a driver to perform logic functions
internally and to provide the user with the advantage of a simplified
control interface. The driver features two digital control input
pins, CTRL and EN.
When the EN pin is logic low, the RF1 to RFC path is in an
insertion loss state, and the RF2 to RFC path is in an isolation
state, or vice versa, depending on the logic level applied to the
CTRL pin. The insertion loss path (for example, RF1 to RFC)
conducts the RF signal equally well in both directions between
its throw port (for example, RF1) and common port (RFC). The
isolation path (for example, RF2 to RFC) provides high loss
between the insertion loss path and its throw port (for example,
RF2) terminated to an internal 50 Ω resistor.
When the EN pin is logic high, both the RF1 to RFC path and
the RF2 to RFC path are in an isolation state regardless of the
logic state of CTRL. RF1 and RF2 ports are terminated to
internal 50 Ω resistors, and RFC becomes open reflective.
The ideal power-up sequence is as follows:
1. Power up GND.
2. Power up VDD and VSS. The relative order is not
important.
3. Power up the digital control inputs. The relative order of
the logic control inputs is not important. However,
powering the digital control inputs before the VDD supply
can inadvertently forward bias and damage the internal
ESD protection structures.
4. Apply an RF input signal.
Table 4. Control Voltage Truth Table
Digital Control Input
RF Paths
EN
CTRL
RF1 to RFC
RF2 to RFC
Low
Low
Isolation (off)
Insertion loss (on)
Low
High
Insertion loss (on)
Isolation (off)
High
Low
Isolation (off)
Isolation (off)
High
High
Isolation (off)
Isolation (off)


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