RF2909 데이터 시트보기 (PDF) - RF Micro Devices
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RF2909 Datasheet PDF : 8 Pages
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Pin Function Description
19
RF OUT Power Amp output, open collector output.
RF2909
Interface Schematic
INSTGT
RF OUT
20
GND5
Same as pin 17.
21
GND6
Same as pin 17.
22
NC
23
I REF
Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. To obtain a carrier suppres- I SIG
I REF
sion of better than 25dB it may be tuned ±0.15V (relative to the I SIG
DC voltage). Without tuning, the carrier suppression will typically be
better than 25dB. The input impedance of this pin is 3kΩ.
BIAS
24
I SIG
Baseband input to the I mixer. A DC bias of approximately 1.7V is
See pin 23.
present at this pin.A DC blocking capacitor is needed if the signal has a
different DC level. Maximum output power is obtained when the input
signal has a peak to peak amplitude of 1V. The input impedance of this
pin is about 3 kΩ. The REF and SIG inputs are interchangeable. If
swapping the I SIG and I REF pins, the Q SIG and Q REF also need to
be swapped to maintain the correct phase. The SIG and REF pins may
be driven differentially to increase conversion gain.
Table I
Operation TX PLL
Mode
PD ON
Sleep Mode
Low Low
PLL Buffer
Low High
Linear Po Mode High High
Digital Po Mode High High
Medium Power High High
High Power
High High
PC 1
Low
Low
Low
Low
High
Low
PC 2
Low
Low
Low
Low
Low
High
APC
0V
0V
0-Vcc V
0V
0V
0V
Function
Entire chip is powered down. Total Icc<1µA.
LO Buffer is on. Icc=1.5mA
Transmitter in on. Power output is proportional to APC.
Transmitter is on. Power out is 1mW.
Transmitter is on. Power out is 10mW.
Transmitter is on. Power out is 70mW.
11
Rev B1 010904
11-107
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