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LUCW3011FCL View Datasheet(PDF) - Agere -> LSI Corporation

Part Name
Description
Manufacturer
LUCW3011FCL
Agere
Agere -> LSI Corporation Agere
LUCW3011FCL Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Data Sheet
September 1999
W3011
1 GHz Quadrature Modulator
RFOUT Matching: Basic Open Collector Termination
The W3011 RF output uses an open collector output architecture. To operate properly, this requires that dc bias
current be provided through the output pin (pin 17). Thus, the output matching network must always provide a
shunt dc connection to the positive power supply. Examples of such a connection include a shunt-matching
inductor or a shunt RF choke. Figure 4 illustrates a simple RFOUT matching configuration.
VCC
20
19
18
17
TO TX SAW FILTER
(50 )
Figure 4. W3011 RF Output Diagram
Offset Mixer
W3011 with Offset Mixer Disabled
If the offset mixer in the W3011 is not required for the frequency plan, the offset mixer may be turned off by
connecting the positive supply (VCC) to any or all of pins 11 (LOHN), 12 (LOHP), 13 (LOLN), or 14 (LOLP), as
illustrated in Figure 5 below. Disabling the offset mixer reduces current consumption 2 mA to 3 mA. If pin 11 is
connected to VCC, pins 12, 13, and 14 must be connected to VCC or no-connect (NC). Connect the RF VCO to
either pin 9 or pin 10 through a low-impedance coupling capacitor, and connect the unused pin (10 or 9) through
a similar capacitor to ground.
I
1
VCC
20
Q
APC
ENB
14
13
12
10
11
OPTIONAL TERMINATION RESISTOR
TO TX SAW FILTER
CONNECT VCC TO ANY OF PINS
11—14 TO DISABLE OFFSET
MIXER AND REDUCE POWER
SUPPLY CURRENT
VCC
Figure 5. W3011 Application with Offset Mixer Disabled
Lucent Technologies Inc.
7
 

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