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19-3720; Rev 0; 11/06
1.5V to 3.6V, 416ksps, 1-Channel True-Differential/ 2-Channel Single-Ended, 8-Bit, SAR ADCs
General Description
The MAX1391/MAX1394 micropower, serial-output, 8-bit, analog-to-digital converters (ADCs) operate with a single power supply from +1.5V to +3.6V. These ADCs feature automatic shutdown, fast wake-up, and a highspeed 3-wire interface. Power consumption is only 0.743mW (VDD = +1.5V) at the maximum conversion rate of 416ksps. AutoShutdown™ between conversions reduces power consumption at slower throughput rates. The MAX1391/MAX1394 require an external reference V REF that has a wide range from 0.6V to V DD . The MAX1391 provides one true-differential analog input that accepts signals ranging from 0 to VREF (unipolar mode) or ±VREF/2 (bipolar mode). The MAX1394 provides two single-ended inputs that accept signals ranging from 0 to V REF . Analog conversion results are available through a 5MHz 3-wire SPI™-/QSPI™-/ MICROWIRE™-/digital signal processor (DSP)-compatible serial interface. Excellent dynamic performance, low voltage, low power, ease of use, and small package sizes make these converters ideal for portable battery-powered data-acquisition applications, as well as other applications that demand low-power consumption and minimal space. The MAX1391/MAX1394 are available in a space-saving (3mm x 3mm), 10-pin TDFN package. The parts operate over the extended (-40°C to +85°C) and military (-55°C to +125°C) temperature ranges.
Features
o 416ksps, 8-Bit Successive-Approximation Register (SAR) ADCs o Single True-Differential Analog Input Channel with Unipolar-/Bipolar-Selected Input (MAX1391) o Dual Single-Ended Input Channel with ChannelSelected Input (MAX1394) o ±0.2 LSB INL, ±0.2 LSB DNL, No Missing Codes o ±0.25 LSB Total Unadjusted Error (TUE) o 49dB SINAD at 100kHz Input Frequency o Single-Supply Voltage (+1.5V to +3.6V) o 0.97mW at 416ksps, 1.8V o 0.230mW at 100ksps, 1.8V o 3.1µW at 1ksps, 1.8V o < 1µA Shutdown Current o External Reference (0.6V to VDD) o AutoShutdown Between Conversions o SPI-/QSPI-/MICROWIRE-/DSP-Compatible, 3- or 4-Wire Serial Interface o Small (3mm x 3mm), 10-Pin TDFN
MAX1391/MAX1394
Applications
Portable Datalogging Data Acquisition Medical Instruments Battery-Powered Instruments Process Control
Typical Operating Circuit and Pin Configurations appear at end of data sheet. AutoShutdown is a trademark of Maxim Integrated Products, Inc. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information
PART MAX1391ETB MAX1391MTB** MAX1394ETB MAX1394MTB** TEMP RANGE -40°C to +85°C -55°C to +125°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* ANALOG INPUTS 1-CH DIFF 1-CH DIFF 2-CH S/E 2-CH S/E TOP MARK AOX — APA — PKG CODE T1033-1 T1033-1 T1033-1 T1033-1
*EP = Exposed pad. **Future product—contact factory for availability. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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1.5V to 3.6V, 416ksps, 1-Channel True-Differential/ 2-Channel Single-Ended, 8-Bit, SAR ADCs MAX1391/MAX1394
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +4V SCLK, CS, OE, CH1/CH2, UNI/BIP, DOUT to GND.........................................-0.3V to (VDD + 0.3V) AIN+, AIN-, AIN1, AIN2, REF to GND ........-0.3V to (VDD + 0.3V) Maximum Current into Any Pin .........................................±50mA Continuous Power Dissipation (TA = +70°C) 10-Pin TDFN (derate 18.5mW/°C above +70°C) ....1481.5mW Operating Temperature Ranges MAX139_E_ _...................................................-40°C to +85°C MAX139_M_ _ ................................................-55°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = +1.5V to +3.6V, VREF = VDD, CREF = 0.1µF, fSCLK = 5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER DC ACCURACY (Note 2) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error Total Unadjusted Error Offset-Error Temperature Coefficient Gain-Error Temperature Coefficient Channel-to-Channel Offset Matc.