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MAX1146BCUPMAXIMN/a10avaiMultichannel, True-Differential, Serial, 14-Bit ADCs
MAX1147BEUPMAXIMN/a70avaiMultichannel, True-Differential, Serial, 14-Bit ADCs
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MAX1149BEUP ,Multichannel, True-Differential, Serial, 14-Bit ADCsApplicationsPortable Data LoggingPin Configurations appear at end of data sheet.Data AcquisitionMed ..
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MAX1146BCUP-MAX1147BEUP-MAX1149BEUP
Multichannel, True-Differential, Serial, 14-Bit ADCs
19-3488: Rev 1; 1/05
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General Description
The MAX1146-MAX1149 Iow-power, 14-bit, multichan-
nel, analog-to-digital converters (ADCs) feature an
internal track/hold (T/H), voltage reference, and clock.
The MAX1146/MAX1148 operate from a single +4.75V
to +5.25V supply, and the MAX1147/MAX1149 operate
from a single +2.7V to +3.6V supply. All analog inputs
are software configurable for unipolar/bipolar and sin-
gle-ended/differential operation,
The 4-wire serial interface connects directly to
SPlTM/OSPl"1/MlCROWlRETM devices without external
logic. The serial strobe output (SSTRB) allows COnve-
nient connection to digital signal processors. The
MAX1146-MAX1149 use an internal clock or an exter-
nal serial-interface clock to perform successive-approx-
imation analog-to-digital conversions.
The MAX1146/MAX1148 include an internal +4.0961/
reference, while the MAX1147/MAX1149 include an
internal +2.500V reference. All devices accept an exter-
nal reference from 1.5V to VDD.
The MAX1146-MAX1149 provide a hardware shutdown
and two software power-down modes. Using the soft-
ware power-down modes allows the devices to be pow-
ered down between conversions. When powered down,
accessing the serial interface automatically powers up
the devices. The quick turn-on time allows power-down
between all conversions. This technique reduces sup-
ply current to under 120pA for quick turn-on,
The MAX1146-MAX1149 are available in a 20-pin
TSSOP package.
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Process Control
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Multichannel, True-Differential,
Serial, 14-Bit ADCs
Features
. 8-Channel Single-Ended or 4-Channel Differential
Inputs (MAX1148/MAX1149)
. 4-Channel Single-Ended or 2-Channel Differential
Inputs (MAX1146/MAX1147)
. Internal Multiplexer and T/H
' Single-Supply Operation
4.75V to 5.25V Supply (MAX1146/MAX1148)
2.7V to 3.6V Supply (MAX1147/MAX1149)
' Internal Reference
+4.096V (MAX1146/MAX1148)
+2.500V (MAX1147/MAX1149)
' 116ksps Sampling Rate
' Low Power
1.1mA (116ksps)
120pA (1 Oksps)
12pA (1 ksps)
300nA (Power-Down Mode)
. SPl-/t2SPl-/MlCROWIRE Compatible
' 20-Pin TSSOP
Pin Configurations appear at end of data sheet.
SPl/OSP/ are trademarks of Motorola, Inc.
MiCR0WlRE is a trademark of National Semiconductor Corp.
Ordering Information/Selector Guide
PART TEMP PIN- INL INPUT INTERNAL
RANGE PACKAGE (LSB) CHANNELS REFERENCE (V)
MAX1146BCUP 0°C to +70°C 20 TSSOP _+2 4 +4096
MAX1146BEUP -40°C to +85°C 20 TSSOP s2 4 +4096
MAX1147BCUP 0°C to +70°C 20 TSSOP 12 4 +2500
MAX1147BEUP -40oC to +85°C 20 TSSOP t2 4 +2500
MAX1148BCUP 0°C to +70°C 2O TSSOP i2 8 +4096
MAX1148BEUP -40°C to +85°C 20 TSSOP s2 8 +4096
MAX1149BCUP 0°C to +70°C 20 TSSOP i2 8 +2500
MAX1149BEUP -400C to +85°C 20 TSSOP i2 8 +2500
[VI IJXI/VI Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at .
617 [- l-XVW'Q I- LXVl/U
MAX 1 1 46—MAX 1 1 49
Multichannel, True-Differential,
Serial, 14-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND, DGND .....
AGND to DGND ..............
CHO-CH, COM to AGND.
REF, REFADJ to AGND ..
Digital Inputs to DGND,,.
Digital Outputs to DGND...
Digital Output Sink Current
.. (VDD + 0.3V)
0.3V to (VDD + 0.3V)
... ....25mA
Continuous Power Dissipation (TA = +70''C)
2O TSSOP (derate 10.9mW/°C above +70°C) ............. 879mW
Operating Temperature Ranges
MAX114_ BC_ _ '___...-.-.......-.......- 0°C to +70°C
..-40''C to +85°C
-60°C to +150°C
....+300°C
MAX114_ BE_ - ............
Storage Temperature Range ._.
Lead Temperature (soldering, 10s)
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.
ELECTRICAL CHARACTERISTICS
(VDD = 5V (MAX1146/MAX1148), VDD = 3.3V (MAX1147/MAX1149), SHDN = VDD, VCOM = 0, fSCLK = 2.1MHz, external clock (50%
duty cycle), 18 clocks/conversion (116ksps), VREFADJ = VDD, CREF = 2.2pF, external +4.096V reference at REF (MAX1146/
MAX1148), external 2.500V reference at REF (MAX1147/MAX1149), TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER I SYMBOL I CONDITIONS MIN TYP MAX UNITS
DC ACCURACY (Note I)
Resolution 14 Bits
Relative Accuracy (Note 2) lNL t0.7 i2 LSB
Differential Nonlinearity DNL No missing codes over temperature -1.0 10.5 +1.5 LSB
Offset Error :10 LSB
Offset Temperature Coefficient 0.3 ppm/°C
Gain Error (Note 3) t20 LSB
Gain Temperature Coefficient 10.8 ppm/°C
Changel-to-Channel Offset tl LSB
Matching
ChanneI-to-Channel Gain tl LSB
Matching
DYNAMIC SPECIFICATIONS (1 kHz sine-wave input, 2.5VP-P, tull-scale analog input, 116ksps, 2.1 MHz external clock)
Signal-to-Noise Plus Distortion
, SINAD 77 81 dB
Total Harmonic Distortion THD Up to the 51h harmonic -96 -88 dB
Spurious-Free Dynamic Range SFDR 84 98 dB
ChanneI-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, 2.1MH2 15 SCLK cycles 7.2
Conversion Time (Note 5) tCONV us
Internal clock 6 8
IVI/JXI/VI
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