Rainbow Electronics MAX1448 - Manual (Page 16)

MAX1448
10-Bit, 80Msps, Single +3.0V, Low-Power
ADC with Internal Reference
16 ______________________________________________________________________________________
Total Harmonic Distortion (THD)
THD is typically the ratio of the RMS sum of the input
signal’s first five harmonics 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.
___________________Chip Information
TRANSISTOR COUNT: 5684
PROCESS: CMOS
HOLD
ANALOG
INPUT
SAMPLED
DATA (T/H)
T/H
t AD
t AJ
TRACK TRACK
CLK
Figure 10. Track-and-Hold Aperture Timing
THD V V V V V
= × + + +
( )
20 1
2
2
3
2
4
2
5
2
log ( ) /
MAX1448
TQFP
TOP VIEW
32 28 29 30 31 25 26 27
REFIN GND REFOUT D0 REFP D1 D2 D3
10 13 15 14 16 11 12 9
V
DD
GND V
DD PD
CLK
OE
GND
D9
17
18
19
20
21
22
23 OGND
24 D4
T.P.
OV DD
D5
D6
D7
D8
2
3
4
5
6
7
8 GND
IN-
IN+
GND
GND
V DD
COM
1 REFN
Pin Configuration