MAX1144-MAX1145 Datasheet, PDF (16/18 Pages) Maxim Integrated Products – 14-Bit ADCs, 150ksps, 3.3V Single Supply

14-Bit ADCs, 150ksps, 3.3V Single Supply
Signal-to-Noise Plus Distortion
Signal-to-noise plus distortion (SINAD) is the ratio of the
fundamental input frequency’s RMS amplitude to the
RMS equivalent of all other ADC output signals:
SINAD (dB) = 20 x log (Signal_RMS / Noise_RMS)
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:


THD = 20 × log ^


V₂
2
+ V₃₂
+ V₄₂
+
V₅
2







V₁




where V1 is the fundamental amplitude, and V2 through
V5 are the amplitudes of the 2nd- through 5th-order
harmonics.
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.
Functional Diagram
AV_DD
AGND
CREF
REF
AIN
DV_DD
DGND
CS
SCLK
DIN
RST
SHDN
MAX1144
MAX1145
INPUT
SCALING
NETWORK
DAC
ANALOG TIMING CONTROL
COMPARATOR
SERIAL
INPUT
PORT
CLOCK
GENERATOR
MEMORY
CALIBRATION
ENGINE
CONTROL
SERIAL
OUTPUT
PORT
SSTRB
DOUT
P2
P1
P0
16 ______________________________________________________________________________________