GM6535 データシートの表示（PDF） - Hyundai Micro Electronics

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GM6535

60 MHz Universal Programmable Dual PLL Frequency synthesizer

Hyundai Micro Electronics 

GM6535

Table 3. Global CT-1 Reference frequency Setting vs Channel Frequencies

Country

U.S.A

France

Spain

Australia

U.K

New

Zealand

Channel Frequency

46/49MHz(10,15,25 Channels)

26/41 MHz

31/41 MHz

30/39 MHz

1.7/47 MHz

1.7/34/40 MHz

fR1

5.0 KHz

6.25 KHz/12.5

KHz

5.0 KHz

5.0 KHz

6.25 KHz

6.25 KHz

fR2

-

-

-

-

1.0 KHz

1.0 KHz

REFERENCE FREQUENCY SELECTION

AND PROGRAMMING

Figure 16 shows the bit function of the reference

frequency programming word. The user can either

select the fixed reference frequency for all channels

accordingly or provide a specific reference

frequency for a particular channel by using two

reference frequency counters (e.g., for an

application in France, the base set transmit channel

common fixed reference frequency is 6.25 KHz or

12.5 KHz). (See Table 3 Figure 6 for reference

frequencies for various countries.)

However, transmit channels 6, 8, and 14 can be

set to 25 KHz, and channel 8 reference frequency

can be set to 50 KHz. But this reference frequency

may not be applied to the receiving side; therefore,

the receiving side reference frequency must be

generated by another reference frequency counter.

The higher the reference frequency, the better the

phase noise performance and faster the lock time,

but the PLL consumes more current if both

reference frequency counters are in operation. In

general, the 12-bit reference frequency counter plus

the ÷ 4 and ÷ 25 module can offer all the reference

frequencies for global CT-1 transmit and receive

channel requirements. Users can select their own

reference frequency by introducing the additional

14-bit auxiliary reference frequency counter.

Again, the 14-bit auxiliary reference frequency

counter can be shut down by the auxiliary reference

enable bit in the reference counter programming

word by setting the bit to 0. At this state, the fR2 is

automatically connected to point C (the ÷ 25 block

output), and fR1 cha be connected to point A or B by

setting the fR1-S1 and fR1-S2 bits in the reference

counter program word. The 14-bit auxiliary

reference frequency counter data will be in Don’t

Care state.

If the 14-bit auxiliary reference frequency counter

is enabled (auxiliary reference enable = 1), the fR2 is

automatically connected to point D (14-bit counter

output), and fR1 can be selected to connect to point

A,B, or C, depending on the bit setting of fR1-S1 and

fR1-S2.

Table 4 and Figure 16 describe the functions of

the auxiliary reference enable bit and the fR1-S1 and

fR1-S2 bits selection.

Table 4. Bit Function and the Reference Frequency Selection Bit Setting of the

Reference Frequency Counter Programming Word

N/A Not Applicable

AUX REF

Enable

Auxiliary Reference Frequency

Counter Mode

Module

Select

fR1

S1

fR1

S2

fR1

Routin

g

14-Bit Auxiliary Reference Frequency fR2→ C 0

0

N/A

0

Counter Disable

0

1 fR1→ A

1

0 fR1→ B

1 1 N/A

14-Bit Auxiliary Reference Frequency fR2→ D 0

0

N/A

Counter Disable

1

0

1 fR1→ A

1

0 fR1→ B

1

1 fR1→ C

11

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