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HT9015 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

Part # HT9015
Description  RF Single Chip for Cordless Phone
PDF  23 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9015 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc

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HT9015
17
April 10, 2000
Preliminary
· Noise detector
Figure 8 is a band pass filter which can detect
noise energy on N_REC pin. There is also a
pass through the noise comparator to deter-
mine two states on SIG_OUT pin by internal
control register setting. The high state ex-
presses noise level more than 0.4V and the
low state expresses noise level under 0.4V.
V DD
No i s e
Fi l t e r
R1
R2
R3
A udi o S i g nal
C2
C1
N _ F I L_I N
N _F I L_O U T
R4
R5
AM P
C3
B and- P a s s F i l t er
F O = 31k H z
H i gh- P a s s F i l t er
F C = 25k H z
N_ RE C
N o i s e C o m par a t or
No i s e De t .
I n t e r nal
C4
V OU T
Ex t e r n a l
Ex t e r n a l
Figure 8 Noise detector



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