Datasheet

+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
2
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 AGND, DGND ..............................................-0.3V to +6V
AGND to DGND
...................................................-0.3V to +0.3V
CH0–CH7, COM to AGND, DGND
........... -0.3V to (V
DD
+ 0.3V)
V
REF
, REFADJ to AGND ...........................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to DGND
...........................................-0.3V to +6V
Digital Outputs to DGND
.......................... -0.3V to (V
DD
+ 0.3V)
Digital Output Sink Current
................................................25mA
Continuous Power Dissipation (T
A
= +70NC)
PDIP (derate 11.11mW/NC above +70NC)
...................889mW
SSOP (derate 8.00mW/NC above +70NC)
....................640mW
Operating Temperature Ranges
MAX148_C_P/MAX149_C_P
.............................. 0NC to +70NC
MAX148_E_P/MAX149_E_P
............................ -40NC to +85NC
MAX149BMAP
............................................... -55NC to +125NC
Storage Temperature Range
............................ -60NC to +150NC
Lead Temperature (soldering, 10s)
................................+300NC
Soldering Temperature (reflow)
......................................+260NC
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V; COM = 0; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX149—4.7FF capacitor at V
REF
pin; MAX148—external reference, V
REF
= 2.500V applied to V
REF
pin; T
A
= T
MIN
to T
MAX
, unless
otherwise noted.)
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC ACCURACY (Note 1)
Resolution 10 Bits
Relative Accuracy (Note 2) INL
MAX14_A ±0.5
LSB
MAX14_B ±1.0
Differential Nonlinearity DNL No missing codes over temperature ±1 LSB
Offset Error
MAX14_A ±0.15 ±1
LSB
MAX14_B ±0.15 ±2
Gain Error (Note 3)
MAX14_A ±1
LSB
MAX14_B ±2
Gain Temperature Coefficient ±0.25 ppm/°C
Channel-to-Channel Offset
Matching
±0.05 LSB
DYNAMIC SPECIFICATIONS (10kHz Sine-Wave Input, 0 to 2.500V
P-P
, 133ksps, 2.0MHz External Clock, Bipolar Input Mode)
Signal-to-Noise + Distortion
Noise
SINAD 66 dB
Total Harmonic Distortion THD Up to the 5th harmonic -70 dB
Spurious-Free Dynamic Range SFDR 70 dB
Channel-to-Channel Crosstalk 65kHz, 2.500V
P-P
(Note 4) -75 dB
Small-Signal Bandwidth -3dB rolloff 2.25 MHz
Full-Power Bandwidth 1.0 MHz
CONVERSION RATE
Conversion Time (Note 5) t
CONV
Internal clock, SHDN = unconnected 5.5 7.5
μs
Internal clock, SHDN = V
DD
35 65
External clock = 2MHz, 12 clocks/
conversion
6
Track/Hold Acquisition Time t
ACQ
1.5 μs
Aperture Delay 30 ns
Aperture Jitter < 50 ps