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參數(shù)資料
| 型號： | WE904 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx單芯片F(xiàn)M收發(fā)器 |
| 文件頁數(shù)： | 10/39頁 |
| 文件大?。?/td> | 623K |
| 代理商： | WE904 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 18
Rev Date: 2003 May 27
IF FILTER BANDWIDTH
The bandwidth of the on-chip IF low pass filter, which precedes the Period to Digital demodulator,
should be optimized as follows. Following the calculation of Fif and BWdm from section above, the
filter bandwidth is adjusted by choice of the external resistor between VDDA and IFSET.
R = 22kΩ x 206kHz / (Fif + 0.5 x BWdm)
There is an on-chip high pass IF filter fixed at 8kHz.
Examples
Rx Freq
Frf /MHz
PDR
Fpd /MHz
Fif /kHz
BWdm
/kHz
Suitable for
Rx BW /kHz
Recommended
IFSET R /kΩ
915
12
76.25
140.2
131.5
130
22
930
48
19.4
35.6
33.4
25
82
869
24
36.2
66.5
62.4
50
47
434
24
18.1
33.2
31.2
25
91
RSSI
For WE904, the RSSI output is a current source which work with external shunt resistor and capacitor
(47k
10nF) to develop a filtered voltage level inversely proportional to the receive RF signal
strength.
For WE905, the matched shunt resistor is provided internally. This eliminates the error due to
tolerance of external discrete resistor. Only a 10nF capacitor is required on RSSI pin.
The RSSI measurement range is from -100dBm to -35dBm, with the RF input pad bypassed (0dB)
and the quadrature mixer gain stage set to high. This range is extended as the receiver gain is
reduced. The RSSI conversion factor is
(-30mV/dB), with a voltage range of 2.1 to 0.1 Vdc.
RSSI TOLERANCE
For WE904, typically with 5% 47k resistor, the RSSI voltage tolerance is about +/-10%.
For WE905, the RSSI tolerance is about +/-2%.
If external low noise amplifier (LNA) and filters are added at the Rx front end, the LNA gain and filter
loss will vary from unit to unit and will contribute to additional RSSI variation above the IC’s RSSI
tolerance.
As the RSSI voltage depends on its load, it should be connected only to an ADC or a comparator with
high input impedance.
METHODS OF CORRECTING RSSI TOLERANCE
For applications that require accurate RSSI, the tolerance can be corrected by the use of an analog-
to-digital converter (ADC) or a trimmer pot meter.
If ADC is used, the tolerance can be corrected using software.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| WE905 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.1 - 1GHx Single Chip FM Transceiver |
| WE9104 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9110 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9140 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
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