Datasheet

MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 5V (MAX1146/MAX1148), V
DD
= 3.3V (MAX1147/MAX1149), SHDN = V
DD
, V
COM
= 0, f
SCLK
= 2.1MHz, external clock (50%
duty cycle), 18 clocks/conversion (116ksps), V
REFADJ
= V
DD
, C
REF
= 2.2µF, external +4.096V reference at REF (MAX1146/
MAX1148), external 2.500V reference at REF (MAX1147/MAX1149), 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 AGND, DGND............................................-0.3V to +6.0V
AGND to DGND.....................................................-0.3V to +0.3V
CH0–CH7, COM to AGND..........................-0.3V to (V
DD
+ 0.3V)
REF, REFADJ to AGND ..............................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to DGND...............................-0.3V to (V
DD
+ 0.3V)
Digital Outputs to DGND............................-0.3V to (V
DD
+ 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
20 TSSOP (derate 10.9mW/°C above +70°C) .............879mW
Operating Temperature Ranges
MAX114_ BC_ _ ..................................................0°C to +70°C
MAX114_ BE_ _ ...............................................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
DC ACCURACY (Note 1)
Resolution 14 Bits
Relative Accuracy (Note 2) INL
±0.7
±2 LSB
Differential Nonlinearity DNL No missing codes over temperature
-1.0 ±0.5 +1.5
LSB
Offset Error
±10
LSB
Offset Temperature Coefficient 0.3
ppm/°C
Gain Error (Note 3)
±20
LSB
Gain Temperature Coefficient
±0.8
ppm/°C
Channel-to-Channel Offset
Matching
±1 LSB
Channel-to-Channel Gain
Matching
±1 LSB
DYNAMIC SPECIFICATIONS (1kHz sine-wave input, 2.5V
P-P
, full-scale analog input, 116ksps, 2.1MHz external clock)
Signal-to-Noise Plus Distortion
Ratio
SINAD 77 81 dB
Total Harmonic Distortion THD Up to the 5th harmonic -96 -88 dB
Spurious-Free Dynamic Range SFDR 84 98 dB
Channel-to-Channel Crosstalk (Note 4) -85 dB
Small-Signal Bandwidth SSBW -3dB point 3.0
MHz
Full-Power Bandwidth FPBW SINAD > 68dB 2.0
MHz
CONVERSION RATE
External clock, 2.1MHz 15 SCLK cycles 7.2
Conversion Time (Note 5) t
CONV
Internal clock 6 8
µs