MAX1146 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Multichannel, True-Differential, Serial, 14-Bit ADCs

19-3488; Rev 1; 1/05
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Multichannel, True-Differential,
Serial, 14-Bit ADCs
General Description
The MAX1146–MAX1149 low-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
SPI™/QSPI™/MICROWIRE™ 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 +4.096V
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 120µA 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
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)
120µA (10ksps)
12µA (1ksps)
300nA (Power-Down Mode)
♦ SPI-/QSPI-/MICROWIRE Compatible
♦ 20-Pin TSSOP
Pin Configurations appear at end of data sheet.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
PART
MAX1146BCUP
MAX1146BEUP
MAX1147BCUP
MAX1147BEUP
MAX1148BCUP
MAX1148BEUP
MAX1149BCUP
MAX1149BEUP
TEMP
RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
Ordering Information/Selector Guide
INL
(LSB)
±2
±2
±2
±2
±2
±2
±2
±2
INPUT
CHANNELS
4
4
4
4
8
8
8
8
INTERNAL
REFERENCE (V)
+4.096
+4.096
+2.500
+2.500
+4.096
+4.096
+2.500
+2.500
________________________________________________________________ Maxim Integrated Products 1
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