Chip information – Rainbow Electronics MAX1093 User Manual
Page 18
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 V
1
is the fundamental amplitude, and V
2
through
V
5
are the amplitudes of the 2nd- through 5th-order har-
monics.
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
20
log
V
V
V
V
/ V
2
2
3
2
4
2
5
2
1
=
+
+
+
⋅
MAX1091/MAX1093
250ksps, +3V, 8-/4-Channel, 10-Bit ADCs
with +2.5V Reference and Parallel Interface
18
______________________________________________________________________________________
+3V
V
LOGIC
= +2V/+3V GND
SUPPLIES
DGND
+2V/+3V
COM
GND
4.7
µF
0.1
µF
V
DD
DIGITAL
CIRCUITRY
MAX1091
MAX1093
R* = 5
Ω
*OPTIONAL
Figure 11. Power-Supply and Grounding Connections
CLK
ACQUISITION
CONTROL BYTE
CONVERSION
LOW
BYTE
HIGH
BYTE
D7–D0 D9–D8
LOW
BYTE
HIGH
BYTE
D7–D0
D9–D8
ACQUISITION
SAMPLING INSTANT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
WR
RD
HBEN
D7–D0
STATE
CONTROL
BYTE
Figure 10. Timing Diagram for Fastest Conversion
Chip Information
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