LTC6903 查看數據表（PDF） - Linear Technology

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LTC6903

1kHz to 68MHz Serial Port Programmable Oscillator

Linear Technology 

LTC6903/LTC6904

Pin Functions

GND (Pin 1): Negative Power Supply (Ground). Should

be tied directly to a ground plane for best performance.

SDI (Pin 2): Serial Data Input. Data for serial transfer is

presented on this pin.

SCK (Pin 3): Serial Port Clock. Input, positive edge trig-

gered. Clocks serial data in on rising edge.

SEN (Pin 4): Serial Port Enable (LTC6903 Only). Input,

active LOW. Initiates serial transaction when brought LOW,

finalizes transaction when brought HIGH after 16 clocks.

ADR (Pin 4): Serial Port Address (LTC6904 Only). Sets

the I2C serial port address.

CLK (Pin 5): Auxiliary Clock Output. Frequency set by

serial port.

CLK (Pin 6): Main Clock Output. Frequency set by serial port.

OE (Pin 7): Asynchronous Output Enable. CLK and CLK

are set LOW when this pin is LOW.

V+ (Pin 8): Positive Power Supply. This supply must be

kept free from noise and ripple. It should be bypassed

directly to a ground plane with a quality 0.1µF capacitor.

Additional bypass may be necessary for operation at high

frequency or under larger loads.

Block Diagram

V+

OE

CLK

CLK

8

7

6

5

–+

+

A1

MASTER

OSCILLATOR

PROGRAMMABLE

DIVIDER

–

ISET

VSET

fMO

=

68MHz

• kΩ

ISET

V+ – VSET

DAC

OCT

SERIAL PORT

1

2

3

4

GND

SDI

SCK

SEN (LTC6903)

ADR (LTC6904)

69034 BD

69034fe

6

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