MAX1421 Maxim, MAX1421 Datasheet - Page 16

• Manufacturer Part Number: MAX1421
• Description: 12-Bit / 40Msps / +3.3V / Low-Power ADC with Internal Reference
• Manufacturer: Maxim

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
V
monics.
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.
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.
12-Bit, 40Msps, +3.3V, Low-Power ADC
with Internal Reference
16
5
are the amplitudes of the 2nd- through 5th-order har-
THD
______________________________________________________________________________________
=
1
is the fundamental amplitude, and V
20
Total Harmonic Distortion (THD)
×
Spurious-Free Dynamic Range (SFDR)
log
10





Intermodulation Distortion (IMD)
(
V
2
2
+
V
3
2
V
+
1
V
4
2
+
V
5
2
)





2
through
CLK
CLK
INN
INP
PD
REFERENCE
T/H
BANDGAP
REFIN REFP CML REFN
REF SYSTEM +
PIPELINE ADC
INTERFACE
Functional Diagram
BIAS
MAX1421
DRIVERS
OUTPUT
OE
AV
AGND
D11–D0
DV
DGND
DD
DD