Rainbow-electronics MAX1145 Bedienungsanleitung PDF herunterladen (Seite 16)

MAX1144/MAX1145

Signal-to-Noise Plus Distortion

Signal-to-noise plus distortion (SINAD) is the ratio of the

fundamental input frequency’s RMS amplitude to the

RMS equivalent of all other ADC output signals:

SINAD (dB) = 20 x log (Signal

RMS

/ Noise

RMS

)

Total Harmonic Distortion

Total harmonic distortion (THD) is the ratio of the RMS

sum of the first five harmonics of the input signal to the

fundamental itself. This is expressed as:

where V1 is the fundamental amplitude, and V2 through

V5 are the amplitudes of the 2nd- through 5th-order

harmonics.

Spurious-Free Dynamic Range

Spurious-free dynamic range (SFDR) is the ratio of RMS

amplitude of the fundamental (maximum signal compo-

nent) to the RMS value of the next largest distortion

component.

THD

VVVV

=×

+++





















log

14-Bit ADCs, 150ksps, 3.3V Single Supply

16 ______________________________________________________________________________________

Functional Diagram

CREF

AGND

REF

RST

AIN

DGND

SCLK

DIN

ANALOG TIMING CONTROL

INPUT

SCALING

NETWORK

SERIAL

OUTPUT

PORT

SERIAL

INPUT

PORT

MEMORY CALIBRATION

ENGINE

CLOCK

GENERATOR

CONTROL

DAC

COMPARATOR

SSTRB

DOUT

SHDN

MAX1144

MAX1145

1 2 ... 11 12 13 14 15 16 17 18

MAX1144/MAX1145 1

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