MAX1282/MAX1283 19-1688 Rev 0 5/00 300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference General Description Features The MAX1282/MAX1283 12-bit analog-to-digital convert- 4-Channel Single-Ended or 2-Channel ers (ADCs) combine a 4-channel analog-input multiplexer, Pseudo-Differential Inputs high-bandwidth track/hold (T/H), and serial interface with Internal Multiplexer and Track/Hold high conversion speed and low power consumption. The MAX1282 operates from a single +4.5V to +5.5V supply Single-Supply Operation the MAX1283 operates from a single +2.7V to +3.6V sup- +4.5V to +5.5V (MAX1282) ply. Both devices analog inputs are software configurable +2.7V to +3.6V (MAX1283) for unipolar/bipolar and single-ended/pseudo-differential operation. Internal +2.5V Reference The 4-wire serial interface connects directly to 400kHz Sampling Rate (MAX1282) SPI/QSPI/MICROWIRE devices without external Low Power: 2.5mA (400ksps) logic. A serial strobe output allows direct connection to 1.3mA (REDP) TMS320-family digital signal processors. The MAX1282/ 0.9mA (FASTPD) MAX1283 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. 2A (FULLPD) The devices feature an internal +2.5V reference and a ref- SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire erence-buffer amplifier with a 1.5% voltage-adjustment Serial Interface range. An external reference with a 1V to V range may DD also be used. Software-Configurable Unipolar or Bipolar Inputs The MAX1282/MAX1283 provide a hardwired SHDN pin 16-Pin TSSOP Package and four software-selectable power modes (normal opera- tion, reduced power (REDP), fast power-down (FASTPD), and full power-down (FULLPD)). These devices can be Ordering Information programmed to automatically shut down at the end of a TEMP. PIN- INL conversion or to operate with reduced power. When using PART RANGE PACKAGE (LSB) the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turn- MAX1282BCUE 0C to +70C 16 TSSOP 1 on time allows them to be shut down between all conver- MAX1282BEUE -40C to +85C 16 TSSOP 1 sions. MAX1283BCUE 0C to +70C 16 TSSOP 1 The MAX1282/MAX1283 are available in 16-pin TSSOP MAX1283BEUE -40C to +85C 16 TSSOP 1 packages. Applications Pin Configuration Portable Data Logging TOP VIEW Data Acquisition V 1 16 V DD1 DD2 Medical Instruments CH0 2 15 SCLK Battery-Powered Instruments CH1 3 14 CS Pen Digitizers CH2 4 MAX1282/ 13 DIN Process Control MAX1283 SSTRB CH3 5 12 COM 6 11 DOUT SHDN 7 10 GND REF 8 9 REFADJ Typical Operating Circuit appears at end of data sheet. TSSOP SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. EVALUATION KIT AVAILABLE300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND ........................................................... -0.3V to +6V Continuous Power Dissipation (T = +70C) DD A V to V ....................................................... -0.3V to +0.3V 16-Pin TSSOP (derate 6.7mW/C above +70C) ........ 535mW DD1 DD2 CH0CH3, COM to GND .......................... -0.3V to (V +0.3V) Operating Temperature Ranges DD REF, REFADJ to GND................................ -0.3V to V +0.3V) MAX1282BCUE/MAX1283BCUE ....................... 0C to +70C DD Digital Inputs to GND .............................................. -0.3V to +6V MAX1282BEUE/MAX1283BEUE..................... -40C to +85C Digital Outputs to GND............................. -0.3V to (V +0.3V) Storage Temperature Range ............................ -60C to +150C DD Digital Output Sink Current .................................................25mA Lead Temperature (soldering, 10s) ................................ +300C 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 CHARACTERISTICSMAX1282 (V = V = +4.5V to +5.5V, COM = GND, f = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external DD1 DD2 OSC +2.5V at REF, REFADJ = V , T = T to T , unless otherwise noted. Typical values are at T = +25C.) DD1 A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) 12 Resolution Bits Relative Accuracy (Note 2) INL 1.0 LSB Differential Nonlinearity DNL No missing codes over temperature 1.0 LSB Offset Error 6.0 LSB Gain Error (Note 3) 6.0 LSB Gain-Error Temperature 1.6 ppm/C Coefficient Channel-to-Channel Offset-Error 0.2 LSB Matching DYNAMIC SPECIFICATIONS (100kHz sine-wave input, 2.5Vp-p, 400ksps, 6.4MHz clock, bipolar input mode) Signal-to-Noise plus Distortion SINAD 70 dB Ratio Total Harmonic Distortion THD Up to the 5th harmonic -81 dB 80 Spurious-Free Dynamic Range SFDR dB Intermodulation Distortion IMD f = 99kHz, f =102kHz 76 dB IN1 IN2 Channel-to-Channel Crosstalk 200kHz, V = 2.5Vp-p -78 dB IN (Note 4) Full-Power Bandwidth -3dB point 6 MHz Full-Linear Bandwidth SINAD > 68dB 350 kHz CONVERSION RATE Conversion Time (Note 5) t 2.5 s CONV Track/Hold Acquisition Time t 400 ns ACQ Aperture Delay 10 ns Aperture Jitter <50 ps Serial Clock Frequency f 0.5 6.4 MHz SCLK Duty Cycle 40 60 % 2 MAX1282/MAX1283