MAX1422 Datasheet, PDF (5/15 Pages) Maxim Integrated Products – 12-Bit, 20Msps, 3.3V, Low-Power ADC with Internal Reference

12-Bit, 20Msps, 3.3V, Low-Power ADC with
Internal Reference
Typical Operating Characteristics
(V_AVDD = V_DVDD = 3.3V, AGND = DGND = 0, V_IN = ±1.024V, differential input drive, A_IN = -0.5dBFS, f_CLK = 20MHz (50% duty
cycle) digital output load C_L = 10pF, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at T_A = +25 °C.)
FFT PLOT (4096-POINT DATA RECORD)
0 _{fIN = 5.2235MHz}
-20
-40
-60
HD3
HD2
-80
-100
-120
0
1 2 3 4 5 6 7 8 9 10
ANALOG INPUT FREQUENCY (MHz)
TWO-TONE IMD PLOT
(4096-POINT DATA RECORD)
0
f_IN1 = 7.0283MHz
f_IN2 = 8.0931MHz
-20 f_CLK = 20.0056MHz
A_IN1 = A_IN2 = -6.5dB FS
f_IN2
-40
f_IN1
-60
IMD2
IMD3
-80
-100
-120
0
1 2 3 4 5 6 7 8 9 10
ANALOG INPUT FREQUENCY (MHz)
TOTAL HARMONIC DISTORTION vs.
ANALOG INPUT FREQUENCY
-50
FFT PLOT (4096-POINT DATA RECORD)
0
f_IN = 8.1637MHz
-20
-40
-60
HD2
HD3
-80
-100
-120
0
1 2 3 4 5 6 7 8 9 10
ANALOG INPUT FREQUENCY (MHz)
SPURIOUS-FREE DYNAMIC RANGE vs.
ANALOG INPUT FREQUENCY
85
77
69
61
53
45
1
10
100
ANALOG INPUT FREQUENCY (MHz)
SIGNAL-TO-NOISE PLUS DISTORTION
vs. ANALOG INPUT FREQUENCY
70
-56
66
-62
62
-68
58
-74
54
-80
1
10
100
ANALOG INPUT FREQUENCY (MHz)
50
1
10
100
ANALOG INPUT FREQUENCY (MHz)
FFT PLOT (4096-POINT DATA RECORD)
0
f_IN = 19.8051MHz
-20
-40
HD2
-60
HD3
-80
-100
-120
0
1 2 3 4 5 6 7 8 9 10
ANALOG INPUT FREQUENCY (MHz)
SIGNAL-TO-NOISE RATIO vs.
ANALOG INPUT FREQUENCY
70
66
62
58
54
50
1
10
100
ANALOG INPUT FREQUENCY (MHz)
SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT POWER (f_IN = 5MHz)
80
70
60
50
40
30
20
10
0
-60 -50 -40 -30 -20 -10 0
ANALOG INPUT POWER (dB FS)
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