Datasheet

MAX1421
12-Bit, 40Msps, 3.3V, Low-Power ADC
with Internal Reference
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, V
IN
= ±1.024V, differential input voltage, f
CLK
= 40MHz (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.)
80
75
70
65
60
55
50
45
40
10 302015 25 35 40
SNR/SINAD, -THD/SFDR
vs. CLOCK FREQUENCY
MAX1421 toc22
CLOCK FREQUENCY (MHz)
SNR/SINAD, -THD/SFDR (dB, dBc)
SFDR
-THD
SNR
SINAD
f
IN
= 5MHz
0
10,000
5000
20,000
15,000
25,000
30,000
N-1
N+2
OUTPUT NOISE HISTOGRAM (DC-INPUT)
MAX1421 toc25
DIGITAL OUTPUT NOISE
COUNTS
N-3
N
N+1
N+3
43707
10709
116
1
0
10824
179
N-2
40,000
35,000
45,000
50,000
2.00
2.02
2.06
2.04
2.08
2.10
-40 10-15 35 60 85
INTERNAL REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1421 toc24
TEMPERATURE (°C)
V
REFIN
(V)
2.0750
2.0625
2.0500
2.0375
2.0250
3.1 3.33.2 3.4
INTERNAL REFERENCE VOLTAGE
vs. ANALOG SUPPLY VOLTAGE
MAX1421 toc23
V
DD
(V)
V
REFIN
(V)
3.5