MAX1391/MAX1394 19-3720 Rev 1 10/09 1.5V to 3.6V, 416ksps, 1-Channel True-Differential/ 2-Channel Single-Ended, 8-Bit, SAR ADCs General Description Features The MAX1391/MAX1394 micropower, serial-output, 416ksps, 8-Bit Successive-Approximation 8-bit, analog-to-digital converters (ADCs) operate with a Register (SAR) ADCs single power supply from +1.5V to +3.6V. These ADCs Single True-Differential Analog Input Channel feature automatic shutdown, fast wake-up, and a high- speed 3-wire interface. Power consumption is only with Unipolar-/Bipolar-Selected Input (MAX1391) 0.743mW (V = +1.5V) at the maximum conversion DD Dual Single-Ended Input Channel with Channel- rate of 416ksps. AutoShutdown between conversions Selected Input (MAX1394) reduces power consumption at slower throughput rates. 0.2 LSB INL, 0.2 LSB DNL, No Missing Codes The MAX1391/MAX1394 require an external reference V that has a wide range from 0.6V to V . The REF DD 0.25 LSB Total Unadjusted Error (TUE) MAX1391 provides one true-differential analog input 49dB SINAD at 100kHz Input Frequency that accepts signals ranging from 0 to V (unipolar REF mode) or V /2 (bipolar mode). The MAX1394 pro- REF Single-Supply Voltage (+1.5V to +3.6V) vides two single-ended inputs that accept signals rang- 0.97mW at 416ksps, 1.8V ing from 0 to V . Analog conversion results are REF available through a 5MHz 3-wire SPI-/QSPI-/ 0.230mW at 100ksps, 1.8V MICROWIRE-/digital signal processor (DSP)-compati- 3.1W at 1ksps, 1.8V ble serial interface. Excellent dynamic performance, low voltage, low power, ease of use, and small pack- < 1A Shutdown Current age sizes make these converters ideal for portable bat- External Reference (0.6V to V ) DD tery-powered data-acquisition applications, as well as other applications that demand low-power consumption AutoShutdown Between Conversions and minimal space. SPI-/QSPI-/MICROWIRE-/DSP-Compatible, The MAX1391/MAX1394 are available in a space-sav- 3- or 4-Wire Serial Interface ing (3mm x 3mm), 10-pin TDFN package. The parts Small (3mm x 3mm), 10-Pin TDFN operate over the extended (-40C to +85C) tempera- ture range. Applications Portable Datalogging Typical Operating Circuit and Pin Configurations appear at end of data sheet. Data Acquisition Medical Instruments AutoShutdown is a trademark of Maxim Integrated Products, Inc. SPI/QSPI are trademarks of Motorola, Inc. Battery-Powered Instruments MICROWIRE is a trademark of National Semiconductor Corp. Process Control Ordering Information PART TEMP RANGE PIN-PACKAGE ANALOG INPUTS TOP MARK MAX1391ETB+ -40C to +85C 10 TDFN-EP* 1-CH DIFF AOX MAX1394ETB+ -40C to +85C 10 TDFN-EP* 2-CH S/E APA +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.1.5V to 3.6V, 416ksps, 1-Channel True-Differential/ 2-Channel Single-Ended, 8-Bit, SAR ADCs ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +4V Operating Temperature Ranges DD SCLK, CS, OE, CH1/CH2, UNI/BIP, MAX139 E ...................................................-40C to +85C DOUT to GND.........................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD AIN+, AIN-, AIN1, AIN2, REF to GND ........-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Maximum Current into Any Pin .........................................50mA Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) A 10-Pin TDFN (derate 18.5mW/C above +70C) ....1481.5mW 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 (V = +1.5V to +3.6V, V = V , C = 0.1F, f = 5MHz, T = T to T , unless otherwise noted. Typical values are at DD REF DD REF SCLK A MIN MAX T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 2) Resolution 8 Bits Integral Nonlinearity INL 0.2 LSB Differential Nonlinearity DNL No missing code overtemperature 0.2 LSB Offset Error 0.15 LSB Gain Error Offset nulled 0.15 LSB Total Unadjusted Error TUE 0.25 LSB Offset-Error Temperature 25 mLSB/C Coefficient Gain-Error Temperature 0.06 mLSB/C Coefficient Channel-to-Channel Offset MAX1394 only 0.05 LSB Matching Channel-to-Channel Gain MAX1394 only 0.05 LSB Matching Input Common-Mode Rejection CMR V = 0 to V , MAX1391 only 0.1 mV/V CM DD DYNAMIC SPECIFICATIONS (Note 3) Signal-to-Noise Plus Distortion SINAD 49 dB Signal-to-Noise Ratio SNR 49 dB Total Harmonic Distortion THD -65 dBc Spurious-Free Dynamic Range SFDR -66 dBc f = 98kHz at -6.5dBFS, IN1 Intermodulation Distortion IMD -73 dB f = 102kHz at -6.5dBFS IN2 Channel-to-Channel Crosstalk MAX1394 only -70 dB Full-Power Bandwidth -3dB point 4 MHz MAX1391 200 Full-Linear Bandwidth SINAD > 48dB kHz MAX1394 150 CONVERSION RATE Conversion Time t 9 clock cycles per conversion 1.8 s CONV 2 MAX1391/MAX1394