MAX1246 Maxim, MAX1246 Datasheet
MAX1246
Manufacturer Part Number
MAX1246
Description
+2.7V / Low-Power / 4-Channel / Serial 12-Bit ADCs in QSOP-16
Manufacturer
Maxim
Datasheet
1.MAX1246.pdf
(24 pages)
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The MAX1246/MAX1247 12-bit data-acquisition systems
combine a 4-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. The MAX1246 oper-
ates from a single +2.7V to +3.6V supply; the MAX1247
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 MAX1246/MAX1247
use either the internal clock or an external serial-interface
clock to perform successive-approximation analog-to-
digital conversions.
The MAX1246 has an internal 2.5V reference, while the
MAX1247 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 MAX1246/MAX1247, 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 MAX1246/MAX1247 are available in a 16-pin DIP and
a small QSOP that occupies the same board area as an
8-pin SO.
For 8-channel versions of these devices, see the
MAX146/MAX147 data sheet.
Portable Data Logging
Medical Instruments
Pen Digitizers
Pin Configuration appears at end of data sheet.
________________________Applications
19-1071; Rev 1; 3/97
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
Serial 12-Bit ADCs in QSOP-16
+2.7V, Low-Power, 4-Channel,
Ordering Information continued at end of data sheet.
†
____________________________Features
__________Typical Operating Circuit
Contact factory for availability of alternate surface-mount
packages.
______________Ordering Information
MAX1246ACPE
MAX1246BCPE
MAX1246ACEE
MAX1246BCEE
4-Channel Single-Ended or 2-Channel
Differential Inputs
Single-Supply Operation:
Internal 2.5V Reference (MAX1246)
Low Power: 1.2mA (133ksps, 3V supply)
SPI/QSPI/Microwire/TMS320-Compatible
4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
16-Pin QSOP Package (same area as 8-pin SO)
PART
+2.7V to +3.6V (MAX1246)
+2.7V to +5.25V (MAX1247)
ANALOG
INPUTS
0.047 F
0V TO
+2.5V
4.7 F
†
54µA (1ksps, 3V supply)
1µA (power-down mode)
CH0
CH3
VREF
REFADJ
TEMP. RANGE
MAX1246
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
SSTRB
DGND
AGND
DOUT
SHDN
SCLK
COM
V
DIN
CS
DD
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
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
INL
1
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