DS1089LU-21G(2005) Просмотр технического описания (PDF) - Maxim Integrated

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DS1089LU-21G
(Rev.:2005)

3.3V Center Spread-Spectrum EconOscillator™

Maxim Integrated 

3.3V Center Spread-Spectrum EconOscillator™

Block Diagram

PDN

OE

SDA

SCL

VCC

GND

SPRD

H/W GATED OUTPUT

I2C SERIAL

INTERFACE

I2C

ADDRESS

BITS

CONTROL REGISTERS

S/W GATED OUTPUT

WRITE EE

COMMAND

ADDR

J3 J2 OE X WC A2 A1 A0

EEPROM

WRITE

CONTROL

EEPROM

DITHER RATE

DITHER %

VCC

J1 J0 LO/ X P3 P2 P1 P0

HIZ

PRESCALER

DS1089L

OUTPUT CONTROL

FACTORY-

PROGRAMMED

MASTER

OSCILLATOR

33.3MHz TO

66.6MHz

f MOD

PRESCALER

fMOSC

fOSC SYNCED

fOUT

DIVIDE BY 1, 2, 4,

OUTPUT

OUT

8, 16, 32, 64,

BUFFER

128, OR 256

TRIANGLE-

WAVE

GENERATOR

fMOSC

PRESCALER SETTING

OUTPUT CONFIGURATION

Detailed Description

Master Oscillator

The internal master oscillator is capable of generating a

square wave with a 33.3MHz to 66.6MHz frequency

range. The master oscillator frequency (fMOSC) is factory

programmed, and is specified in the Ordering Information.

Prescaler

The user can program the prescaler divider to produce

an output frequency (fOUT) as low as 130kHz using bits

P0, P1, P2, and P3 in the PRESCALER register. The

output frequency can be calculated using Equation 1.

Any value programmed greater than 28 will be decod-

ed as 28. See Table 1 for prescaler divider settings.

Equation 1

Output Frequency (Hz) fOSC

=

fMOSC

2x

where x = P3, P2, P1, P0

Table 1. Prescaler Divider Settings

BITS P3, P2,

2x =

P1, P0

0000

1

0001

2

0010

4

0011

8

0100

16

0101

32

0110

64

0111

128

1000

256

fOUT = fOSC

fMOSC

fMOSC / 2

fMOSC / 4

fMOSC / 8

fMOSC / 16

fMOSC / 32

fMOSC / 64

fMOSC / 128

fMOSC / 256

1111

256

fMOSC / 256

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