10

Signal-to-Noise + Distortion Ratio (SINAD)

SINAD is the measured RMS signal to RMS sum of all other

spectral components below the Nyquist frequency excluding DC.

Effective Number of Bits (ENOB)

The effective number of bits (ENOB) is derived from the

SINAD data. ENOB is calculated from:

where:

Total Harmonic Distortion (THD)

THD is the ratio of the RMS sum of the first 5 harmonic

components to the RMS value of the measured input signal.

+6.4V REF

+5V

A

VIN1

0V TO 6.4V

NC

+5V

D

+5V

6.4V REF

MID-POINT

DRIVER

+5V

A

A

D

A

BIT 9

BIT 8

BIT 1

CLOCK

PHASE

OF

BIT 8

BIT 1

CL

PH

CE2

CE1

CE2

CE1

OF

BIT 8

BIT 1

CL

PH

FIGURE 13. USING TWO CA3318s FOR 9-BIT RESOLUTION

CA3318