User Manual

MAX1377/MAX1379/MAX1383
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
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MAX1379 FFT PLOT
MAX1377 toc19
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE (dB)
f
SAMPLE
= 1.8Msps
f
SCLK
= 28.8MHz
f
IN
= 300kHz
SINAD = 70dB
SNR = 70.27dB
THD = -82.2dB
SFDR = 81.81dB
V
REF
= 4.096V
0
-20
-40
-60
-80
-100
-120
0 400 600 800200
0
-20
-40
-60
-80
-100
-120
0 300 600 900
MAX1379 FFT PLOT
MAX1377 toc20
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE (dB)
f
SAMPLE
= 1.8Msps
f
SCLK
= 28.8MHz
f
IN
= 500kHz
SINAD = 69.58dB
SNR = 69.75dB
THD = -83.79dB
SFDR = 84.69dB
V
REF
= 4.096V
MAX1379 TOTAL HARMONIC DISTORTION
vs. SOURCE IMPEDENCE
SOURCE IMPEDANCE (Ω)
TOTAL HARMONIC DISTORTION (dBc)
100
-82
-84
-80
-78
-76
-74
-72
-86
10 1000
MAX1377 toc21
f
IN
= 500kHz
f
IN
= 100kHz
0
-20
-40
-60
-80
-100
-120
0 300 600 900
MAX1379 INTERMODULATION PLOT
MAX1377 toc22
ANALOG INPUT FREQUENCY (kHz)
AMPLITUDE (dB)
f
SAMPLE
= 1.8Msps
f
SCLK
= 28.8MHz
f
IN1
= 250kHz
f
IN1
= 300kHz
IMD = -81.53dB
V
REF
= 4.096V
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
0.9
0.8
1.0
-40 -10 5 20-25 35 50 65 80
MAX1379 AVDD FULL POWER-DOWN
CURRENT vs. TEMPERATURE
MAX1377 toc23
TEMPERATURE (°C)
2.0
2.4
2.2
2.8
2.6
3.2
3.0
3.4
3.8
3.6
4.0
-40 -10 5 20-25 35 50 65 80
MAX1379 AVDD PARTIAL POWER-DOWN
CURRENT vs. TEMPERATURE
MAX1377 toc24
TEMPERATURE (°C)
AVDD FULL POWER-DOWN CURRENT (mA)
10.0
11.0
10.5
12.5
12.0
11.5
13.5
13.0
14.0
-40 5 20-25 -10 35 50 65 80
MAX1379 AVDD SUPPLY CURRENT
vs. TEMPERATURE
MAX1377 toc25
TEMPERATURE (°C)
AVDD SUPPLY CURRENT (mA)
0
6
4
2
8
10
12
14
16
18
20
0 800400 1200 1600 2000
MAX1379 AVDD SUPPLY CURRENT
vs. CONVERSION RATE
MAX1377 toc26
CONVERSION RATE (kHz)
AVDD SUPPLY CURRENT (mA)
Typical Operating Characteristics (continued)
(V
AVDD
= 5V/3V, V
L
= 3V, f
SCLK
= 20MHz, T
A
= +25°C, unless otherwise noted.)