Datasheet

Typical Operating Characteristics (continued)
(V
DD
= +5V, V
L
= V
DD
, f
SCLK
= 28.8MHz, f
SAMPLE
= 1.8Msps, T
A
= -40°C to +85°C unless otherwise noted. Typical values are
meas- ured at T
A
= +25°C.)
MAX1276/MAX1278
1.8Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
6 _______________________________________________________________________________________
DYNAMIC PERFORMANCE
vs. INPUT FREQUENCY (MAX1278)
MAX1276/78 toc10
ANALOG INPUT FREQUENCY (kHz)
DYNAMIC PERFORMANCE (dB)
400300200
71.25
71.50
71.75
72.00
71.00
100 500
SNR
SINAD
THD vs. INPUT FREQUENCY
MAX1276/78 toc11
ANALOG INPUT FREQUENCY (kHz)
THD (dB)
400300200
-92
-94
-90
-88
-86
-96
100 500
MAX1278
MAX1276
SFDR vs. INPUT FREQUENCY
MAX1276/78 toc12
ANALOG INPUT FREQUENCY (kHz)
SFDR (dB)
400300200
89
87
91
93
95
85
100 500
MAX1278
MAX1276
FFT PLOT (MAX1276)
MAX1276/78 toc13
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE (dB)
750600450300150
-120
-100
-80
-60
-40
-20
0
-140
0 900
f
IN
= 500kHz
SINAD = 71.0dB
SNR = 71.1dB
THD = -87.1dB
SFDR = 90.2dB
FFT PLOT (MAX1278)
MAX1276/78 toc14
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE (dB)
750600450300150
-120
-100
-80
-60
-40
-20
0
-140
0900
f
IN
= 500kHz
SINAD = 71.2dB
SNR = 71.3dB
THD = -95.5dB
SFDR = 90.5dB
TOTAL HARMONIC DISTORTION
vs. SOURCE IMPEDANCE
MAX1276/78 toc15
SOURCE IMPEDANCE (Ω)
THD (dB)
100
-90
-80
-70
-60
-50
-100
10 1000
f
IN
= 500kHz
f
IN
= 100kHz