I2781AF-08ST 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

I2781AF-08ST

General Purpose EMI Reduction IC

ON Semiconductor 

P2781/82/84

Pin Configuration

XIN / CLKIN 1

XOUT 2

FS1 3

LF 4

P278xA

8 VDD

7 FS0

6 ModOUT

5 VSS

Standard pin Configuration offered in both

8 pin SOIC Packages.

Pin Description (P278xA)

Pin# Pin Name

Type

1

XIN/CLKIN

I

2

XOUT

O

3

FS1

I

4

LF

I

5

VSS

I

6

ModOUT

O

7

FS0

I

8

VDD

P

Description

Connect to crystal or clock input. This pin has dual functions. It can be connected

either to an external crystal or an external reference clock.

Crystal connection. If using an external reference, this pin must be left

unconnected.

Digital logic input used to select input frequency range (see the Input Frequency

Selection Table). This pin has an internal pull-up resistor.

External Loop Filter for the PLL. By changing the value of the CRC circuit, the

percentage spread can be adjusted accordingly. See the Loop Filter Selection

Table for detail value.

Ground Connection. Connect to system ground.

Spread Spectrum Clock Output.

Digital logic input used to select input frequency range (see the Input Frequency

Selection Table). This pin has an internal pull-up resistor.

Connect to +3.3 V

Input Frequency Selection Table

FS1 FS0 Input (MHz)

Output Frequency Scaling (MHz)

P2781A

P2782A

P2784A

0

0

3 to 9

3 to 9

6 to 18

12 to 36

0

1

10 to 19

10 to 19

20 to 38

40 to 76

1

0

20 to 38

20 to 38

40 to 76

80 to 152

1

1

39 to 78

39 to 78

78 to 156

156 to 312

Modulation Rate (KHz)

Fin / 128

Fin / 256

Fin / 512

Fin / 1024

Rev. 2 | Page 2 of 8 | www.onsemi.com

Share Link: