Typical Operating Characteristics (continued)
(VDD = +5V, VL = VDD, VREF = 4.096V, fSCLK = 28.8MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are measured
at TA = +25°C)
MAX1274/MAX1275
1.8Msps, Single-Supply, Low-Power,
True-Differential, 12-Bit ADCs
6
_______________________________________________________________________________________
FFT PLOT (MAX1275)
MAX1274
toc10
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
800
600
400
200
-120
-100
-80
-60
-40
-20
0
-140
0
1000
fSAMPLE = 2Msps
fSCLK = 32MHz
fIN = 100kHz
SINAD = 70.41dB
SNR = 70.53dB
THD = -85.92dB
SFDR = 87.56dB
FFT PLOT (MAX1274)
MAX1274
toc11
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
800
600
400
200
-120
-100
-80
-60
-40
-20
0
-140
0
1000
fSAMPLE = 2Msps
fSCLK = 32MHz
fIN = 300kHz
SINAD = 70.88dB
SNR = 71.24dB
THD = -81.96dB
SFDR = 83.65dB
FFT PLOT (MAX1275)
MAX1274
toc12
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
800
600
400
200
-120
-100
-80
-60
-40
-20
0
-140
0
1000
fSAMPLE = 2Msps
fSCLK = 32MHz
fIN = 300kHz
SINAD = 70.66dB
SNR = 71.09dB
THD = -80.85dB
SFDR = 81.26dB
FFT PLOT (MAX1274)
MAX1274
toc13
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
800
600
400
200
-120
-100
-80
-60
-40
-20
0
-140
0
1000
fSAMPLE = 2Msps
fSCLK = 32MHz
fIN = 500kHz
SINAD = 70.84dB
SNR = 71.11dB
THD = -83.05dB
SFDR = 84.68dB
FFT PLOT (MAX1275)
MAX1274
toc14
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE
(dB)
800
600
400
200
-120
-100
-80
-60
-40
-20
0
-140
0
1000
fSAMPLE = 2Msps
fSCLK = 32MHz
fIN = 500kHz
SINAD = 70.55dB
SNR = 70.73dB
THD = -84.43dB
SFDR = 85.16dB
TOTAL HARMONIC DISTORTION
vs. SOURCE IMPEDANCE
MAX1274
toc15
SOURCE IMPEDANCE (
Ω)
THD
(dB)
100
-95
-90
-85
-80
-75
-70
-65
-60
-100
10
1000
fIN = 100kHz
fIN = 500kHz