Datasheet

MAX1421
12-Bit, 40Msps, 3.3V, Low-Power ADC
with Internal Reference
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.)
64
68
76
72
80
84
-40 10-15 35 60 85
SPURIOUS-FREE DYNAMIC RANGE
vs. TEMPERATURE
MAX1421 toc13
TEMPERATURE (°C)
SFDR (dBc)
f
IN
= 5.52MHz
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
020481024 3072 4096
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1421 toc17
DIGITAL OUTPUT CODE
INL (LSB)
0.500
0.375
0.250
0.125
0
-0.125
-0.250
-0.375
-0.500
0 20481024 3072 4096
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1421 toc18
DIGITAL OUTPUT CODE
DNL (LSB)
70
60
50
40
30
-40 10-15 35 6085
ANALOG SUPPLY CURRENT
vs. TEMPERATURE
MAX1421 toc20
TEMPERATURE (°C)
I
AVDD
(mA)
12
10
8
6
4
-40 10-15 35 6085
DIGITAL SUPPLY CURRENT
vs. TEMPERATURE
MAX1421 toc21
TEMPERATURE (°C)
I
AVDD
(mA)
C
L
≈ 10pF
60
62
66
64
68
70
-40 10-15 35 60 85
SIGNAL-TO-NOISE PLUS DISTORTION
vs. TEMPERATURE
MAX1421 toc16
TEMPERATURE (°C)
SINAD (dB)
f
IN
= 5.52MHz
0.50
0.25
0
-0.25
-0.50
-40 10-15 35 60 85
GAIN ERROR vs. TEMPERATURE, EXTERNAL
REFERENCE (V
REFIN
= 2.048V)
MAX1421 toc19
TEMPERATURE (°C)
GAIN ERROR (%FSR)
60
62
66
64
68
70
-40 10-15 35 60 85
SIGNAL-TO-NOISE RATIO
vs. TEMPERATURE
TEMPERATURE (°C)
SNR (dB)
f
IN
= 5.52MHz
MAX1421 toc14
-80
-78
-74
-76
-72
-70
-40 10-15 35 60 85
TOTAL HARMONIC DISTORTION
vs. TEMPERATURE
MAX1421 toc15
TEMPERATURE (°C)
THD (dBc)
f
IN
= 5.52MHz
________________________________________________________________________________________ 7
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
0 20481024 3072 4096
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1421 toc17
DIGITAL OUTPUT CODE
INL (LSB)