HT9015 datasheet(14/23 Pages) HOLTEK

14 / 23 page

HT9015

April 10, 2000

Preliminary

· Example of divider setting

When the LOCAL OSC frequency is 10.240MHz, RX VCO has to oscillate at frequencies from

35.915MHz in 20kHz or 25kHz step.

¨ Reference frequency at the PHASE DETECTOR should be set to 5kHz.

¨ 10.240MHz ¸ 5kHz = 2048, \ R= 2048

¨ Calculate dividing number N for RX divider

¨ 35.915MHz ¸ 5kHz = 7183, \ N (CH16)= 7183

¨ 35.935MHz ¸ 5kHz = 7187, \ N (CH17)= 7187

¨ Finally you set the following registers.

· The power saving arrangement is one of the features in the HT9015.

This is achieved through an inside control register to arrange the power consumption of the three

major parts (RF. IF. PLL). There are two-pair DC power supplies for the HT9015, VCC1-GND1 and

VCC3-GND2. The DC power VCC1 provides operating voltage for the IF detector and the compander

analog parts.

The DC power VCC3 provides the operating voltage for the PLL and data latch control. It also has a

built in 2.0V regulator VCC2 for the RX front end. See the power supply arrangement as shown on

the table below.

VCC1

GND1 1st MIX, 2nd MIX, IF AMP, QUAD, NOISE DET. RX-VCO DATA COMP,

COMPANDER, RECEIVER AMP, SPLATTER.

VCC3

GND2 RX-PLL, TX-PLL, LOCAL OSC, DATA LATCH CONTROL

C ode

1s t

ST B

R X D i v i der f o r 718 3

C ode

1s t

ST B

R E F D i v i der f or R = 204 8

Te s t B C

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