參數(shù)資料
型號(hào)： S1M8656A
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： CDMA/AMPS Dual Mode IF/ baseband IC
中文描述： 碼分多址/ AMPS二元雙模式和IF /基帶IC
文件頁(yè)數(shù)： 15/26頁(yè)
文件大小： 264K
代理商： S1M8656A
RX IF/BBA WITH AGC
S1M8656A
15
Rx Low-Pass Filters
The CDMA baseband signal frequency can range between 1kHz – 630kHz. Normally, the range between 1kHz –
615kHz is called the In-band, between 630kHz – 750kHz Band-edge, and anything outside of these ranges out
band. Very precise characteristics are required in the in-band range. The ripple, I/Q gain-phase error are critical
factors that lead to noise in the in-band. FM Baseband signal ranges between 100Hz – 15kHz. Normally, the
frequency range between 100Hz –12kHz is called the in-band, between 12kHz – 18kHz the band-edge, and
anything outside of these ranges the out-band. As for the CDMA, the ripple, I/Q gain-phase error are critical
factors that lead to noise in the in-band.
The LPF characteristic required by these two systems are shown in Figures 7 and 8 below.
Frequency
Frequency
+1.5dB
-1.5dB
0
-4.0dB
-46.0dB
-48.0dB
1kHz
600kHz
630kHz
750kHz
900kHz
1.2MHz
R
R
+0.5dB
-0.5dB
-3.0dB
-60.0dB
100hz
12.2khz
18khz
60khz
Figure 7. CDMA Rx Low-Pass Filter Masks
Figure 8. FM Rx Low-Pass Filter Masks
CHIPx8 Clock Generator
CHIPx8 CLOCK is a digital division that divides the 19.68MHz TCXO by 512/1025. It holds the TCXO clock by
half cycle every 512th TCXO cycle and strictly speaking it does not generate 9,8304 MHz precisely. The
9.8304MHz is the mean on the 1025TCXO cycle, where 9.84MHz of 50% duty is obtained from 1 – 512 and 513
– 1024. The timing diagram in Figure 9 explains this. The CHIPx8 CLOCK output is held at low when the CDMA
is asleep and FM is idle. Moreover, it can use three division ratios(19.68MHz, 9.84MHz, 9.8304MHz) through the
serial I/F. Various external chip clocks can be used by converting them to inputs.
2/ftcxo
TCXO
CHIPx8
1
2
1023
1024
1025
1026
1027
Figure 9. CHIPx8 Clock form
相關(guān)PDF資料
PDF描述
S1M8656A01-E0T0 CDMA/AMPS Dual Mode IF/ baseband IC
S1M8656A01-F0T0 CDMA/AMPS Dual Mode IF/ baseband IC
S1M8657 TX IF/BBA WITH AGC
S1M8657X01-E0T0 TX IF/BBA WITH AGC
S1M8657X01-F0T0 TX IF/BBA WITH AGC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S1M8656A01-E0T0 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:CDMA/AMPS Dual Mode IF/ baseband IC
S1M8656A01-F0T0 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:CDMA/AMPS Dual Mode IF/ baseband IC
S1M8657 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:TX IF/BBA WITH AGC
S1M8657X01-E0T0 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:TX IF/BBA WITH AGC
S1M8657X01-F0T0 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:TX IF/BBA WITH AGC
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