MAX146 Maxim, MAX146 Datasheet
MAX146
Manufacturer Part Number
MAX146
Description
+2.7Low-Power / 8-Channel / Serial 12-Bit ADCs
Manufacturer
Maxim
Datasheet
1.MAX146.pdf
(24 pages)
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The MAX146/MAX147 12-bit data-acquisition systems
combine an 8-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. The MAX146 oper-
ates from a single +2.7V to +3.6V supply; the MAX147
operates from a single +2.7V to +5.25V supply. Both
devices’ analog inputs are software configurable for
unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/
QSPI™ and Microwire™ devices without external logic. A
serial strobe output allows direct connection to TMS320-
family digital signal processors. The MAX146/MAX147
use either the internal clock or an external serial-interface
clock to perform successive-approximation analog-to-
digital conversions.
The MAX146 has an internal 2.5V reference, while the
MAX147 requires an external reference. Both parts have
a reference-buffer amplifier with a ±1.5% voltage-
adjustment range.
These devices provide a hard-wired SHDN pin and a
software-selectable power-down, and can be pro-
grammed to automatically shut down at the end of a con-
version. Accessing the serial interface automatically
powers up the MAX146/MAX147, and the quick turn-on
time allows them to be shut down between all conver-
sions. This technique can cut supply current to under
60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and
SSOP packages.
For 4-channel versions of these devices, see the
MAX1246/MAX1247 data sheet.
Portable Data Logging
Medical Instruments
Pen Digitizers
Pin Configuration appears at end of data sheet.
________________________Applications
19-0465; Rev 1; 6/97
SPI and QSPI are registered trademarks of Motorola, Inc.
Microwire is a registered trademark of National Semiconductor Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
________________________________________________________________ Maxim Integrated Products
Data Acquisition
Battery-Powered Instruments
Process Control
+2.7V, Low-Power, 8-Channel,
Ordering Information continued at end of data sheet.
†
*Dice are specified at T
____________________________Features
__________Typical Operating Circuit
Contact factory for availability of alternate surface-mount
packages.
______________Ordering Information
MAX146ACPP
MAX146BCPP
MAX146ACAP
MAX146BCAP
MAX146BC/D
8-Channel Single-Ended or 4-Channel
Differential Inputs
Single-Supply Operation:
Internal 2.5V Reference (MAX146)
Low Power: 1.2mA (133ksps, 3V supply)
SPI/QSPI/Microwire/TMS320-Compatible
4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
20-Pin DIP/SSOP Packages
PART
+2.7V to +3.6V (MAX146)
+2.7V to +5.25V (MAX147)
ANALOG
INPUTS
0.047 F
0V TO
+2.5V
4.7 F
†
Serial 12-Bit ADCs
54µA (1ksps, 3V supply)
1µA (power-down mode)
TEMP. RANGE
CH0
CH7
VREF
REFADJ
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX146
A
= +25°C, DC parameters only.
SSTRB
DGND
AGND
SHDN
DOUT
SCLK
COM
V
DIN
CS
DD
20 Plastic DIP
20 Plastic DIP
20 SSOP
20 SSOP
Dice*
PIN-PACKAGE
+3V
0.1 F
MISO (SI)
V
I/O
SCK (SK)
MOSI (SO)
DD
CPU
V
SS
(LSB)
±1/2
±1
±1/2
±1
±1
INL
1
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