HT9015 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT9015

RF single chip for cordless phone

Holtek Semiconductor 

Preliminary

HT9015

¨ Battery saving control

0 ¼¼¼¼Operation

1 ¼¼¼¼Battery saving

Bit

Control Block

TX-RF

TX-AF

TX-PLL

MIC AMP, Compressor, Splatter

TX-RF= 1 and

RX-RF= 1

LOCAL OSC= OFF

RX-RF

RX-VCO, RX-PLL, 1st MIX, 2nd MIX IF AMP, NOISE DET,

DATA COMP, RSSI

RX-AF

Pre AMP, Expander, Receiver AMP

¨ MUTE control

0 ¼¼¼¼normal

1 ¼¼¼¼MUTE

MUTE for Compressor output.

These bits prevent the compander block going into a battery saving mode. Current consumption

therefore does not decrease.

¨ Charge pump current control

PLL loop performance such as lock-up time can be changed by these control bits.

Bit

Control Output

0

TX CP

TX-PLL Charge Pump Output Current

200mA

RX CP

RX-PLL Charge Pump Output Current

200mA

1

400mA

400mA

¨ BATTERY ALARM detection setting

There are has four threshold levels for low battery detection.

These threshold levels are shown on the table below.

(1)BC

BA1

BA2

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

1

1

(1) BC bit in REF divider

(2) Only for BATTERY ALARM block

VBAT-L

3.00V

3.25V

3.30V

3.45V

(2)Battery Saving

12

April 10, 2000

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