Datasheet

MAX1280/MAX1281
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX1280
(V
DD1
= V
DD2
= +4.5V to +5.5V, COM = GND, f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external
+2.5V at REF, REFADJ = V
DD1
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. 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.
V
DD_
to GND ............................................................ -0.3V to +6V
V
DD1
to V
DD2
........................................................ -0.3V to +0.3V
CH0–CH7, COM to GND.......................... -0.3V to (V
DD1
+ 0.3V)
REF, REFADJ to GND .............................. -0.3V to (V
DD1
+ 0.3V)
Digital Inputs to GND .............................................. -0.3V to +6V
Digital Outputs to GND ............................ -0.3V to (V
DD2
+ 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TSSOP (derate 7.0mW/°C above +70°C) .........559mW
Operating Temperature Ranges
MAX128_BCUP.................................................. 0°C to +70°C
MAX128_BEUP ............................................... -40°C to +85°C
Storage Temperature Range ............................ -60°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Soldering Temperature (reflow) ...................................... +260°C
SINAD > 68dB
-3dB point
f
IN
= 200kHz, V
IN
= 2.5Vp-p
f
IN
1
= 99kHz, f
IN
2
= 102kHz
No missing codes over temperature
Up to the 5th harmonic
CONDITIONS
MHz
0.5 6.4
f
SCLK
Serial Clock Frequency
ps
<50
Aperture Jitter
ns
10
Aperture Delay
ns
468
t
ACQ
Track/Hold Acquisition Time
µs
2.5
t
CONV
Conversion Time (Note 5)
kHz
350
Full-Linear Bandwidth
MHz
6
Full-Power Bandwidth
dB
-78
Channel-to-Channel Crosstalk
(Note 4)
dB
76
IMDIntermodulation Distortion
dB
80
SFDRSpurious-Free Dynamic Range
dB
-81
THDTotal Harmonic Distortion
Bits
12
Resolution
dB
70
SINAD
Signal-to-Noise plus Distortion
Ratio
LSB
±0.1
Channel-to-Channel Offset-Error
Matching
ppm/°C
±0.8
Gain-Error Temperature
Coefficient
±1.0
LSB
±1.0
DNLDifferential Nonlinearity
LSB
±6.0
Offset Error
LSB
±7.0
Gain Error (Note 3)
UNITSMIN TYP MAXSYMBOLPARAMETER
%
40 60
Duty Cycle
DYNAMIC SPECIFICATIONS (100kHz sine-wave input, 2.5Vp-p, 400ksps, 6.4MHz clock, bipolar input mode)
DC ACCURACY (Note 1)
CONVERSION RATE
LSBINLRelative Accuracy (Note 2)
ELECTRICAL CHARACTERISTICS—MAX1280
(V
DD1
= V
DD2
= +4.5V to +5.5V, COM = GND, f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external
+2.5V at REF, REFADJ = V
DD1
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)