Rainbow-electronics MAX1182 Manual de usuario descargar pdf (Pagina 19)

MAX1182

Dual 10-Bit, 65Msps, +3V, Low-Power ADC with

Internal Reference and Parallel Outputs

______________________________________________________________________________________ 19

Total Harmonic Distortion (THD)

THD is typically the ratio of the RMS sum of the first four

harmonics of the input signal to the fundamental itself.

This is expressed as:

where V

is the fundamental amplitude, and V

through

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

harmonics.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio expressed in decibels of the RMS

amplitude of the fundamental (maximum signal compo-

nent) to the RMS value of the next largest spurious

component, excluding DC offset.

Intermodulation Distortion (IMD)

The two-tone IMD is the ratio expressed in decibels of

either input tone to the worst 3rd-order (or higher) inter-

modulation products. The individual input tone levels

are at -6.5dB full scale and their envelope is at -0.5dB

full scale.

THD

VVVV

=×

+++













log

0°

90°

DOWNCONVERTER

MAX2451

INA+

MAX1182

INA-

INB+

INB-

DSP

POST

PROCESSING

Figure 8. Typical QAM Application, Using the MAX1182

HOLD

ANALOG

INPUT

SAMPLED

DATA (T/H)

T/H

TRACK TRACK

CLK

Figure 9. T/H Aperture Timing

Chip Information

TRANSISTOR COUNT: 10,811

PROCESS: CMOS

1 2 ... 14 15 16 17 18 19 20 21

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Rainbow-electronics MAX1182 Manual de usuario Pagina 19

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