HT9015 View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT9015

RF single chip for cordless phone

Holtek Semiconductor 

Preliminary

HT9015

¨ SIG_OUT selection

The SIG_OUT terminal generates combination states of RX and TX lock detectors. The RSSI and

NOISE detector are shown in figure 2 below.

SW1 and SW2 in Fig. 3 determine the output on SIG_OUT using selection bits in a control regis-

ter according to the figure below.

LD TX LD R X R S S I N D

D e c id e S W 1

and LD O U T

D e c id e S W 2

and D E T O U T

E x a m p le : T X lo c k d e te c to r o p e r a tio n

LD TX

LD R X

RSSI

ND

1

0

0

0

Figure 2 SIG_OUT bits

R X P LL

LO C K D E TE C TO R

R X LD

SW 1

LD O U T

S IG _ O U T

TX P LL

IF A M P

TX LD

SW 2

RSSI

DET O UT

N O IS E D E T E C T O R

RSSI

In te rn a l

E x te rn a l

R S S ID E T N D

N _R E C

N _ F IL _ O U T N _ F IL _ IN A F O U T

Figure 3 Signal output block diagram

13

April 10, 2000

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