Preliminary
HT9015
·
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.
R
X
D
i
v
i
d
e
r
f
o
r
7
1
8
3
C
o
d
e
N
1
1
1
1
0
0
0
0
0
0
1
1
1
0
0
1
1
s
F
t
S
T
B
R
E
D
i
v
i
d
e
r
f
o
r
R
=
2
0
4
8
T
e
s
t
B
C
C
o
d
e
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
s
t
S
T
B
·
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.
1st MIX, 2nd MIX, IF AMP, QUAD, NOISE DET. RX-VCO DATA COMP,
COMPANDER, RECEIVER AMP, SPLATTER.
VCC1
VCC3
GND1
GND2 RX-PLL, TX-PLL, LOCAL OSC, DATA LATCH CONTROL
14
April 10, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
