SP8401

Very Low Phase Noise 300MHz

The SP8401 is a very low phase noise variable modulus

divider. Special circuit techniques have been used to reduce

the phase noise considerably below that produced by standard

dividers.

The modulus control input is CMOS or TTL

compatible.

The SP8401 is packaged in a 28 pin plastic SO package to

be compatible with the SP8400 and SP8402 devices.

FEATURES

s Very low Phase Noise (Typically -160dBc/Hz at 1kHz

offset)

s Supply Voltage 5V

ABSOLUTE MAXIMUM RATINGS

Supply Voltage

6.5V

Output Current

20mA

Storage Temperature Range

-55

°C to +125°C

Maximum Clock Input Voltage

2.5V p-p

ORDERING INFORMATION

SP8401 KG MPES(Commercial Grade)

MP28

Fig.1 Pin connections - top view

Supersedes February 1992 edition

DS3230 - 3.1 April 1994

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

N/C

N/C

N/C

GND

CLOCK INPUT

CLOCK INPUT

CLOCK INPUT

CLOCK INPUT

GND

N/C

MODULUS CONTROL

N/C

N/C

N/C

N/C

N/C

N/C

N/C

OUTPUT

OUTPUT

N/C

N/C

N/C

N/C

Fig.2 Typical single sideband phase noise measured at 300MHz

Frequency (Hz)

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

–130

–140

–150

–160

–170

1

10

100

1k

10k

100k