Datasheet

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 the
RMS amplitude of the fundamental (maximum signal
component) to the RMS value of the next-largest distor-
tion component.
THD 20 x log V V V V / V
2
2
3
2
4
2
5
2
1
= +++
()
⎛
⎝
⎜
⎞
⎠
⎟
MAX1061/MAX1063
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/+3VCOM
GND
4.7µF
0.1µF
V
DD
DIGITAL
CIRCUITRY
MAX1061
MAX1063
R* = 5Ω
*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
123 456 78910111213141516
WR
RD
HBEN
D7–D0
STATE
CONTROL
BYTE
Figure 10. Timing Diagram for Fastest Conversion