參數(shù)資料
型號: CXA3328EN
英文描述: WIRELESS COMMUNICATIONS Analog Signal Processor RX-IF IC for W-CDMA Cellular Phones (15 pages 176K Rev. E00738D24-PS)
中文描述: 無線通信市場模擬信號處理器的RX -集成電路中頻的W - CDMA蜂窩電話(15頁176K牧師E00738D24聚苯乙烯)
文件頁數(shù): 10/15頁
文件大?。?/td> 503K
代理商: CXA3328EN
– 10 –
CXA3309ER
Notes on Operation
1. Baseband signal I/Q input
Pins 3 to 6, where the baseband signal is input, do not have a determined voltage internally on the IC.
Therefore, a bias voltage equivalent to 1/2V
CC
should be applied externally.
2. Local signal
The local signal is generated from the components of 3/4 and 5/4 with regard to the local frequency, so
connect the inductor and capacitor in parallel from Pins 8 and 9 to Pins 11 and 12 as a resonance filter to
remove the unnecessary 5/4 signals. Also, the inductor and capacitor should be located as close to the pins as
possible to minimize the series inductance for the pin connections.
3. IF signal output
The IF signal outputs, OUT/OUTX, are differential outputs. The output impedance should be 1k
including the
external resistance with differential. Also, it is necessary to connect the inductor to eliminate the parasitic
capacitance in the IC.
4. Notes on power supplies
The CXA3309ER is designed to operate by a 2.85V stabilized power supply to allow use with the battery
driven portable phones. Using the multiple voltage regulators throughout the phone is recommended to
minimize the power supply noise in the CXA3309ER power supply unit. The recommended power supply range
for the CXA3309ER is from 2.7V to 3.3V. Decouple the power supplies around the CXA3309ER using 1μF
capacitor for each V
CC
pin. Locate this capacitor as close to the pins as possible to minimize the series
inductance. Using an additional 1nF decoupling capacitor in parallel to the 1μF capacitor is recommended to
further reduce the high frequency noise in the power supply input to the CXA3309ER.
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