MAX1248 Maxim, MAX1248 Datasheet
MAX1248
Manufacturer Part Number
MAX1248
Description
2x4-Channel / Simultaneous-Sampling 14-Bit DAS
Manufacturer
Maxim
Datasheet
1.MAX1248.pdf
(24 pages)
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The MAX1248/MAX1249 10-bit data-acquisition sys-
tems combine a 4-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. They operate from
a single +2.7V to +5.25V supply, and their 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
MAX1248/MAX1249 use either the internal clock or an
external serial-interface clock to perform successive-
approximation analog-to-digital conversions.
The MAX1248 has an internal 2.5V reference, while the
MAX1249 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
conversion. Accessing the serial interface automatically
powers up the MAX1248/MAX1249, and the quick
turn-on time allows them to be shut down between all
conversions. This technique can cut supply current to
under 60µA at reduced sampling rates.
The MAX1248/MAX1249 are available in a 16-pin DIP
and a very small QSOP that occupies the same board
area as an 8-pin SO.
For 8-channel versions of these devices, see the
MAX148/MAX149 data sheet.
Portable Data Logging
Medical Instruments
Pen Digitizers
________________________Applications
19-1072; Rev 2; 5/98
_______________ General Description
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
+2.7V to +5.25V, Low-Power, 4-Channel,
Data Acquisition
Battery-Powered Instruments
System Supervision
Serial 10-Bit ADCs in QSOP-16
____________________________Features
_____________ Ordering Information
Ordering Information continued at end of data sheet.
†
__________Typical Operating Circuit
Contact factory for availability of alternate surface-mount
packages.
MAX1248ACPE
MAX1248BCPE
MAX1248ACEE
MAX1248BCEE
4-Channel Single-Ended or 2-Channel
Differential Inputs
Single +2.7V to +5.25V Operation
Internal 2.5V Reference (MAX1248)
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
ANALOG
0.01 F
INPUTS
4.7 F
0V TO
+2.5V
C1
C2
†
CH3
CH0
VREF
REFADJ
MAX1248
54µA (1ksps, +3V supply)
1µA (power-down mode)
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
SSTRB
DGND
AGND
SHDN
SCLK
DOUT
COM
V
DIN
CS
DD
+3V
0.1 F
C3
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
PIN-PACKAGE
SCK (SK)
MOSI (SO)
MISO (SI)
V
I/O
DD
CPU
V
SS
(LSB)
±1/2
±1
±1/2
±1
INL
1
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