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参数资料
| 型号： | WE905 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx单芯片FM收发器 |
| 文件页数： | 9/39页 |
| 文件大小： | 623K |
| 代理商： | WE905 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 17
Rev Date: 2003 May 27
B. Gm baseband filter
On-chip baseband filter bandwidth is adjusted by choice of the external resistor between VDDA and
BBSET. Choose this resistor to give a same bandwidth as above.
R = 22kΩ x (65kHz/BWbb)
E.G.,
for 32kHz ( 16kHz) bandwidth, BWbb=16kHz, suggested value is 82kΩ.
C. DC Offset Correction Loop (Effective Baseband High Pass Filter)
The 3dB bandwidth is set to ±100Hz by the external 330nF capacitors connected to DCI and DCQ.
The HP cut off can be adjusted by inverse proportional change in DCI/DCQ capacitor. For example, in
digital application, if the lowest data rate is 2400bps (1.2kHz), the cut off can be increased from
100Hz to 1kHz by reducing the capacitance to 33nF.
Reduction in the cut off lower than 100Hz, with BWdm=130kHz may lead to instability in Auto Gain
Control mode.
Common
Rx BW
BWbb
IFIL2/QFIL2
Cap /nF
IFIL3/QFIL3
Cap /nF
BBSET
R /kΩ
150 kHz
75 kHz
1.5
0.56
18
130 kHz
65 kHz
1.8
0.68
22
100 kHz
50 kHz
2.2
0.82
27
50 kHz
25 kHz
4.7
1.80
56
25 kHz
12.5 kHz
9.1
3.30
110
DEMODULATOR BANDWIDTH
Demodulator bandwidth, BWdm, is adjusted by the choice of the Period to Digital demodulator clock
frequency, Fpd. The chip divides down the receiver local oscillator, Frf, by the divide ratio, PDR, to
obtain Fpd.
Fpd = Frf/PDR
PDR is programmed by bits 14, 15 & 16 of the reference frequency register.
Allowable PDR divide ratios for WE904 are 2
1, 62, 12, 24, 36, 48, 72, and 96.
Allowable PDR divide ratios for WE905 are 3
3, 94, 12, 24, 36, 48, 72, and 96.
1Ratio 2 can only be used on WE904 with Frf < 180MHz
2Ratio 6 can only be used on WE904 with Frf < 540MHz
3Ratio 3 can only be used on WE905 with Frf < 277MHz
4Ratio 9 can only be used on WE905 with Frf < 830MHz
The choice of Fpd directly sets the IF frequency Fif, and BWdm:
Fif = Fpd/544
BWdm = Fpd/580
Choose a value of PDR to give BWdm > 2 x BWbb.
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相关代理商/技术参数 |
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|---|---|
| WE9104 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Pulse Telephone Dialer |
| WE9110 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Pulse Telephone Dialer |
| WE9140 | 制造商:WINBOND 制造商全称:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140A | 制造商:WINBOND 制造商全称:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140B | 制造商:WINBOND 制造商全称:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
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