Typical operating characteristics – Rainbow Electronics MAX1422 User Manual
Page 5
MAX1422
12-Bit, 20Msps, +3.3V, Low-Power ADC with
Internal Reference
_______________________________________________________________________________________
5
-120
-60
-80
-100
-40
-20
0
0
4
3
1
2
5
6
7
8
9
10
FFT PLOT, 4096-POINT RECORD
DIFFERENTIAL INPUT
MAX1422 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
HD2
HD3
f
IN
= 5.2234999MHz
A
IN
= -0.53dB FS
-120
-60
-80
-100
-40
-20
0
0
4
3
1
2
5
6
7
8
9
10
FFT PLOT, 4096-POINT RECORD
DIFFERENTIAL INPUT
MAX1422 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
IN
= 8.1636865MHz
A
IN
= -0.54dB FS
HD2
HD3
-120
-60
-80
-100
-40
-20
0
0
4
3
1
2
5
6
7
8
9
10
FFT PLOT, 4096-POINT RECORD
DIFFERENTIAL INPUT
MAX1422 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
IN
= 19.8051329MHz
A
IN
= -0.52dB FS
HD2
HD3
-120
-60
-80
-100
-40
-20
0
0
4
3
1
2
5
6
7
8
9
10
TWO-TONE IMD PLOT, 4096-POINT RECORD
DIFFERENTIAL INPUT
MAX1422 toc04
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
IMD2
IMD3
f
IN2
f
IN1
f
IN1
= 7.0283622MHz
f
IN2
= 8.0931176MHz
f
CLK
= 20.0056789MHz
TWO-TONE-ENVELOPE = -0.53dBFS
A
IN1
= A
IN2
= -6.5dB FS
85
45
1
10
100
SPURIOUS-FREE DYNAMIC RANGE vs.
ANALOG INPUT FREQUENCY
53
MAX1422 toc05
ANALOG INPUT FREQUENCY (MHz)
SFDR (dBc) 61
69
77
70
50
1
10
100
SIGNAL-TO-NOISE RATIO vs.
ANALOG INPUT FREQUENCY
54
MAX1422 toc06
ANALOG INPUT FREQUENCY (MHz)
SNR (dB)
58
62
66
-50
-80
1
10
100
TOTAL HARMONIC DISTORTION vs.
ANALOG INPUT FREQUENCY
-74
MAX1422 toc07
ANALOG INPUT FREQUENCY (MHz)
THD (dBc)
-68
-62
-56
70
50
1
10
100
SIGNAL-TO-NOISE PLUS DISTORTION
vs. ANALOG INPUT FREQUENCY
54
MAX1422 toc08
ANALOG INPUT FREQUENCY (MHz)
SINAD (dB) 58
62
66
20
40
30
60
50
70
80
-60
-40
-30
-50
-20
-10
0
SPURIOUS-FREE DYNAMIC RANGE
vs. INPUT POWER (f
IN
= 5MHz)
MAX1422 toc09
INPUT POWER (dB FS)
SFDR (dBc)
10
0
Typical Operating Characteristics
(V
AVDD
= V
DVDD
= +3.3V, AGND = DGND = 0, V
IN
= ±1.024V, differential input voltage, f
CLK
= 20MHz (50% duty cycle) digital out-
put load C
L
= 10pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
°C.)