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MAX1284 Datasheet

  • MAX1284

  • 12-bit analog-to-digital converters

  • 232.11KB

  • MAXIM   MAXIM

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19-1687; Rev 1; 7/00
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
General Description
The MAX1284/MAX1285 12-bit analog-to-digital con-
verters (ADCs) combine a high-bandwidth track/hold
(T/H), a serial interface with high conversion speed, an
internal +2.5V reference, and low power consumption.
The MAX1284 operates from a single +4.5V to +5.5V
supply. The MAX1285 operates from a single +2.7V to
+3.6V supply.
The 3-wire serial interface connects directly to
SPI鈩?QSPI鈩? MICROWIRE鈩?devices without external
logic. The devices use an external serial-interface clock
to perform successive-approximation analog-to-digital
conversions.
Low power, ease of use, and small package size make
these converters ideal for remote-sensor and data-acqui-
sition applications or for other circuits with demanding
power consumption and space requirements. The
MAX1284/MAX1285 are available in 8-pin SO packages.
These devices are pin-compatible, higher-speed ver-
sions of the MAX1240/MAX1241. Refer to the respec-
tive data sheets for more information.
____________________________Features
o
Single-Supply Operation
+4.5V to +5.5V (MAX1284)
+2.7V to +3.6V (MAX1285)
o
卤1LSB (max) DNL, 卤1LSB (max) INL
o
400ksps Sampling Rate (MAX1284)
o
Internal Track/Hold
o
+2.5V Internal Reference
o
Low Power: 2.5mA (400ksps)
o
SPI/QSPI/MICROWIRE 3-Wire Serial-Interface
o
Pin-Compatible, High-Speed Upgrades to
MAX1240/MAX1241
o
8-Pin SO Package
MAX1284/MAX1285
Ordering Information
PART
MAX1284BCSA
MAX1285BCSA
TEMP.
RANGE
0掳C to +70掳C
0掳C to +70掳C
PIN-
SUPPLY
PACKAGE VOLTAGE (V)
8 SO
8 SO
5
5
2.7 to 3.6
2.7 to 3.6
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
MAX1284BESA* -40掳C to +85掳C 8 SO
MAX1285BESA -40掳C to +85掳C 8 SO
*Future
product鈥攃ontact factory for availability.
Pin Configuration
TOP VIEW
V
DD
AIN
1
2
8
7
SCLK
CS
DOUT
GND
SHDN
CS
SCLK
7
8
3
CONTROL
LOGIC
Functional Diagram
V
DD
1
SHDN 3
REF 4
MAX1284
MAX1285
6
5
INT
CLOCK
OUTPUT
SHIFT
REGISTER
6
DOUT
SO
AIN
2
T/H
12-BIT
SAR
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
REF
+2.5V REFERENCE
4
5
GND
MAX1284
MAX1285
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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MAX1285,MAXIM

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