PL133-97

Low-Power DC to 150MHz 1:9 Fanout Buffer IC

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 • www.micrel.com Rev 05/22/14 Page 6

NOISE CHARACTERISTICS (Commercial and Industrial Temperature Devices)

Parameter

Description

Test Conditions

Min.

Typ.

Max.

Unit

Additive Phase Jitter

V DD=3.3V, Frequency=100MHz

Offset=12KHz ~ 20MHz

60

fs

-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

10

100

1000

10000

100000

1000000

10000000

100000000

Offset Frequency (Hz)

PL133-97 Additive Phase Jitter:

VDD=3.3V, CLK=100MHz, Integration Range 12KHz to 20MHz: 0.059ps typical.

REF Input

PL133-97 Output

When a buffer is used to pass a signal then the buffer will add a little bit of its own noise. The phase noise on the output of the

buffer will be a little bit more than the phase noise in the input signal. To quantify the noise addition in the buffer we compare the

Phase Jitter numbers from the input and the output. The difference is called "Additive Phase Jitter". The formula for the Additive

Phase Jitter is as follows:

Additive Phase Jitter = (Output Phase Jitter) - (Input Phase Jitter)

2

2