![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/MAX1276CTC-T_datasheet_105540/MAX1276CTC-T_6.png)
Typical Operating Characteristics (continued)
(VDD = +5V, VL = VDD, fSCLK = 28.8MHz, fSAMPLE = 1.8Msps, TA = -40°C to +85°C unless otherwise noted. Typical values are
meas- ured at TA = +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)
400
300
200
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)
400
300
200
-92
-94
-90
-88
-86
-96
100
500
MAX1278
MAX1276
SFDR vs. INPUT FREQUENCY
MAX1276/78
toc12
ANALOG INPUT FREQUENCY (kHz)
SFDR
(dB)
400
300
200
89
87
91
93
95
85
100
500
MAX1278
MAX1276
FFT PLOT (MAX1276)
MAX1276/78
toc13
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
750
600
450
300
150
-120
-100
-80
-60
-40
-20
0
-140
0
900
fIN = 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)
750
600
450
300
150
-120
-100
-80
-60
-40
-20
0
-140
0900
fIN = 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
fIN = 500kHz
fIN = 100kHz