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TA31275FN 数据表(PDF) 8 Page - Toshiba Semiconductor

部件名 TA31275FN
功能描述  AM/FM RF/IF Detector IC for Low Power Wireless System
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制造商  TOSHIBA [Toshiba Semiconductor]
网页  http://www.semicon.toshiba.co.jp/eng
标志 TOSHIBA - Toshiba Semiconductor

TA31275FN 数据表(HTML) 8 Page - Toshiba Semiconductor

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TA31275FN/ TA31275FNG
03-01-23
8
12. Control Terminal for Quick Charge Circuit (CHARGE)
CHARGE (15 pin) is control terminal for quick charge circuit. REF (20 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 20).
If the connected external capacitor (C11) is 0.1
µF, 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)
R10
R9
R8
C20
C19
C18
1200 bps
68 k
68 k
68 k
0.01
µF
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
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 (30 k
Ω))
R
R10
C20
C19
1200 bps
36 k
68 k
4700 pF
1500 pF
2400 bps
36 k
68 k
2200 pF
680 pF
4800 bps
36 k
68 k
1000 pF
390 pF
When the filter constants shown below are used, it is not necessary to set the R constant value.
R
R10
C20
C19
1200 bps
30 k
6800 pF
2200 pF
2400 bps
30 k
3300 pF
1500 pF
4800 bps
30 k
1800 pF
820 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.


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