MAX1291

Features:

12-Bit Resolution, ±0.5LSB Linearity
+3V Single Operation
User-Adjustable Logic Level (+1.8V to +3.6V)
Internal +2.5V Reference
Software-Configurable, Analog Input Multiplexer
                     8-Channel Single-Ended/
                     4-Channel Pseudo-Differential (MAX1291)
                     4-Channel Single-Ended/
                     2-Channel Pseudo-Differential (MAX1293)

Software-Configurable, Unipolar/Bipolar Inputs
Low Power: 1.7mA (250ksps)
                    1.0mA (100ksps)
                    400µA (10ksps)
                    2µA (Shutdown)

Application

Industrial Control Systems
Data Logging
Energy Management
Patient Monitoring
Data-Acquisition Systems
Touch Screens


Pinout




Specifications

VDD to GND..............................................................-0.3V to +6V
VLOGIC to GND.........................................................-0.3V to +6V
CH0CH7, COM to GND............................   -0.3V to (VDD + 0.3V)
REF, REFADJ to GND ................................    -0.3V to (VDD + 0.3V)
Digital Inputs to GND ...............................................-0.3V to +6V
Digital Outputs (D0D11, INT) to GND...-0.3V to (VLOGIC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C) ...........   762mW
28-Pin QSOP (derate 8.00mW/°C above +70°C) ........   .667mW
Operating Temperature Ranges
MAX1291_C_ _/MAX1293_C_ _.............................. 0°C to +70°C
MAX1291_E_ _/MAX1293_E_ _ ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C

Description

The MAX1291/MAX1293 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an on-chip clock, +2.5V internal reference, and a high-speed, byte-wide parallel interface.

They operate with a single +3V analog supply and feature a VLOGIC pin that allows them to interface directly with a +1.8V to +5.5V digital supply.Power consumption is only 5.7mW (VDD = VLOGIC) at
the maximum sampling rate of 250ksps. Two software- selectable power-down modes enable the MAX1291/ MAX1293 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can cut supply current to under 10µA at reduced sampling rates.