3.3V Spread-Spectrum EconOscillator

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7

Pin Description

PIN

NAME

FUNCTION

1

OUT

Oscillator Output

2

SPRD

Dither Enable. When the pin is high, the dither is enabled. When the pin is low, the dither is disabled.

Power Supply

4

GND

Ground

5OE

Output Enable. When the pin is high, the output buffer is enabled. When the pin is low, the output is

disabled but the internal master oscillator is still on.

6

PDN

Power-Down. When the pin is high, the master oscillator is enabled. When the pin is low, the master

oscillator is disabled (power-down mode).

7

SDA

2-Wire Serial Data. This pin is for serial data transfer to and from the device.

8

SCL

2-Wire Serial Clock. This pin is used to clock data into and out of the device.

Figure 1. Functional Diagram

SDA

SCL

2-WIRE

INTERFACE

EEPROM CONTROL

REGISTERS

PRESCALER

ADDR

SPRD

PDN

OUT

OE

TRIANGLE WAVE

GENERATOR

FACTORY-PROGRAMMED

OSCILLATOR

PRESCALER

BY 1, 2, 4...256

GND

MASTER

OSCILLATOR

OUTPUT

DITHER SIGNAL

DITHER

CONTROL

DS1087L