HT9015 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT9015

RF single chip for cordless phone

Holtek Semiconductor 

Preliminary

HT9015

· 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

B a n d - P a s s F ilte r

F O=31kH z

N _ F IL _ IN

N o is e

V OUT

F ilte r

N _ F IL _ O U T

E x te rn a l

R5

R4

C3

R3

A u d io S ig n a l

C1

C2

R1

H ig h - P a s s F ilte r

F C=25kH z

N o is e C o m p a r a to r

N o is e D e t.

AM P

N _R E C

In te rn a l

E x te rn a l

C4

R2

Figure 8 Noise detector

17

April 10, 2000

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