Chip information – Rainbow Electronics MAX1182 User Manual
Page 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
1
is the fundamental amplitude, and V
2
through
V
5
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
V
V
V
V
V
=
×
+
+
+
20
10
2
2
3
2
4
2
5
2
1
log
0
°
90
°
÷8
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
t
AD
t
AJ
TRACK
TRACK
CLK
Figure 9. T/H Aperture Timing
Chip Information
TRANSISTOR COUNT: 10,811
PROCESS: CMOS