Rainbow-electronics DS1099 Instrukcja Użytkownika Pobierz pdf (Strona 5)

DS1099

Low-Frequency Dual EconOscillator

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Detailed Description

The DS1099 consists of a fixed-frequency 1.048MHz

master oscillator followed by two independent factory-

programmable dividers. The two divider outputs are

connected to pins OUT0 and OUT1, which are inde-

pendently enabled/disabled using the output-enable

pins, OE0 and OE1, respectively. When the output-

enable pins are active (low), the corresponding outputs

are enabled. If either output-enable pin is tied to its

inactive state (high), then the corresponding output is

disabled and forced high immediately. The output-

enable pins only disable the corresponding output

driver(s) and do not shut down the master oscillator or

the dividers.

Since the master oscillator frequency, f

MOSC

, is fixed,

the frequency of OUT0 and OUT1 is determined by

DIVIDER 0 and DIVIDER 1, respectively. And since

each output has its own divider, f

OUT0

and f

OUT1

can

be programmed independent of each other.

The frequency of the outputs are calculated as follows:

OUT0

= f

MOSC

/ 2

= 1.048MHz / 2

OUT1

= f

MOSC

/ 2

= 1.048MHz / 2

where X

is the DIVIDER 0 setting and X

is the

DIVIDER 1 setting. Valid values for X

and X

are inte-

gers 0 to 22 (dec).

Table 1 shows output frequencies and divider values

for the range of divider settings.

Table 1. Divider Settings and Output

Frequencies

DIVIDER SETTING

OR X

DIVISOR

OUT0

OR f

OUT1

0 1 1.048MHz

1 2 0.524MHz

2 4 0.262MHz

3 8 0.131MHz

4 16 65.50kHz

5 32 32.75kHz

———

19 524,288 2Hz

20 1,048,576 1Hz

21 2,097,152 0.5Hz

22 4,194,304 0.25Hz

Functional Diagram

DS1099

GND

MASTER

OSCILLATOR

1.048MHz

DIVIDER 0

DIVIDE BY 2

(X = X

= 0...22)

DIVIDER 1

DIVIDE BY 2

(X = X

= 0...22)

OE1

OE0

OUT0

OUT1

OUT0

OUT1

MOSC

FACTORY-

PROGRAMMED

EEPROM

OUTPUT

DRIVER

OUTPUT

DRIVER

1 2 3 4 5 6

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