Datasheet

MAX1421
12-Bit, 40Msps, 3.3V, Low-Power ADC
with Internal Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, V
IN
= ±1.024V, differential input voltage at -0.5dB FS, internal reference,
f
CLK
= 40MHz (50% duty cycle), digital output load C
L
≈ 10pF, T
A
≥ +25°C guaranteed by production test, T
A
< +25°C guarnateed
by design and characterization. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
AV
DD
, DV
DD
to AGND..............................................-0.3V to +4V
DV
DD
, AV
DD
to DGND..............................................-0.3V to +4V
DGND to AGND.....................................................-0.3V to +0.3V
INP, INN, REFP, REFN, REFIN,
CML, CLK,
CLK,....................(AGND - 0.3V) to (AV
DD
+ 0.3V)
D0–D11, OE, PD .......................(DGND - 0.3V) to (DV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP (derate 12.5mW/°C above +70°C)........1000mW
Maximum Junction Temperature .....................................+150°C
Operating Temperature Ranges
MAX1421CCM ...................................................0°C to +70°C
MAX1421ECM ................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
DC ACCURACY
Resolution RES 12
Bits
T
A
= +25°C, no missing codes -1 +1
Differential Nonlinearity DNL
T
A
= T
MIN
to T
MAX
±0.5
LSB
Integral Nonlinearity INL T
A
= T
MIN
to T
MAX
±2
LSB
Midscale Offset MSO -3
±.75
+3
%FSR
Midscale Offset Temperature
Coefficient
MSOTC 3
✕
10
-4
%/°C
Internal reference (Note 1) -5
+0.1
+5
External reference applied to REFIN (Note 2)
-5 ±3 +5
Gain Error GE
External reference applied to REFP, CML,
and REFN (Note 3)
-1.5 ±0.5 +1.5
%FSR
Gain-Error Temperature
Coefficient
GETC
External reference applied to REFP, CML,
and REFN (Note 3)
15
✕
10
-6
%/°C
DYNAMIC PERFORMANCE (f
CLK
= 40MHz, 4096-point FFT)
f
IN
= 5MHz 67
Signal-to-Noise Ratio SNR
f
IN
= 15MHz, T
A
= +25°C6266
dB
f
IN
= 5MHz 73
Spurious-Free Dynamic Range SFDR
f
IN
= 15MHz, T
A
= +25°C6470
dBc
f
IN
= 5MHz -74
Total Harmonic Distortion THD
f
IN
= 15MHz, T
A
= +25°C -69 -62
dBc
f
IN
= 5MHz 66
Signal-To-Noise Plus Distortion
SINAD
f
IN
= 15MHz, T
A
= +25°C60
63.5
dB
f
IN
= 5MHz
10.7
Effective Number of Bits
ENOB
f
IN
= 15MHz, T
A
= +25°C60
10.3
Bits
Two-Tone Intermodulation
Distortion
IMD
TT
f
IN1
= 11.569MHz, f
IN2
= 13.445MHz
(Note 4)
-80
dBc