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參數(shù)資料
| 型號： | TA32305FNG |
| 廠商： | Toshiba Corporation |
| 英文描述： | RF 1chip Receiver and Transmitter for low power wireless |
| 中文描述： | 射頻1chip接收器和發(fā)射低功率無線 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 605K |
| 代理商： | TA32305FNG |
TA32305FN/FNG
2003-12-04
9
12. Control Terminal for Quick Charge Circuit (CHARGE)
CHARGE (18 pin) is control terminal for quick charge circuit. REF (22 pin) control terminal for quick
charge a given period by time constant of internal resistance and outside capacitance. Enabling the
CHARGE pin requires an external capacitor. In normal operation, connect a capacitor having the same
capacitance as that of the capacitor connected to the REF pin (pin 22).
If the connected external capacitor (C30) is 0.1
μ
F, the quick charge time is 7 ms (typically).
13. Bit Rate Filter for FM
The current FM bit rate filter is used as a tertiary filter.
If the filter is to be used at a rate other than 1200 bps, please change the filter constant.
Quadratic Filter (NRZ)
R12
R13
R14
C14
C15
C18
1200 bps
68 k
68 k
68 k
0.01
μ
F
560 pF
3300 pF
2400 bps
68 k
68 k
68 k
4700 pF
270 pF
1500 pF
4800 bps
68 k
68 k
68 k
2200 pF
150 pF
680 pF
9600 bps
68 k
68 k
68 k
1200 pF
68 pF
390 pF
14. Bit Rate Filter for AM
The current AM bit rate filter is used as a quadratic filter.
If the filter is to be used at a rate other than 1200 bps, please change the filter constant.
Quadratic Filter (NRZ)
(the bit rate filter time constant takes into account the internal resistance RSSI (24 k
))
R15
R12
C14
C15
1200 bps
43 k
68 k
4700 pF
1500 pF
2400 bps
43 k
68 k
2200 pF
680 pF
4800 bps
43 k
68 k
1000 pF
390 pF
9600 bps
43 k
68 k
470 pF
180 pF
In addition, the current AM bit rate filter can be used as a tertiary filter.
If the filter is to be used at a rate other than 1200 bps, please change the filter constant.
Quadratic Filter (NRZ)
(the bit rate filter time constant takes into account the internal resistance RSSI (24 k
)
)
R15
R13
R12
C14
C15
C18
1200 bps
43 k
68 k
68 k
0.01
μ
F
560 pF
3300 pF
2400 bps
43 k
68 k
68 k
4700 pF
270 pF
1500 pF
4800 bps
43 k
68 k
68 k
2200 pF
150 pF
680 pF
9600 bps
68 k
68 k
68 k
1200 pF
68 pF
390 pF
For the cutoff frequency of the bit rate filter, specify a sufficiently high value for the bit rate to be used.
Specifying a relatively high cutoff frequency for the bit rate filter enables a low capacitor to be used at
the REF pin, therefore making the pulse rise quickly.
When AM is used, the internal resistance of RSSI is used. So, take the output resistance into account
when specifying a cutoff frequency.
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