MAX1284/MAX1285 19-1687 Rev 2 12/10 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference General Description Features The MAX1284/MAX1285 12-bit analog-to-digital con- Single-Supply Operation verters (ADCs) combine a high-bandwidth track/hold +4.5V to +5.5V (MAX1284) (T/H), a serial interface with high conversion speed, an +2.7V to +3.6V (MAX1285) internal +2.5V reference, and low power consumption. 1LSB (max) DNL, 1LSB (max) INL The MAX1284 operates from a single +4.5V to +5.5V supply. The MAX1285 operates from a single +2.7V to 400ksps Sampling Rate (MAX1284) +3.6V supply. Internal Track/Hold The 3-wire serial interface connects directly to SPI/QSPI/ MICROWIRE devices without external +2.5V Internal Reference logic. The devices use an external serial-interface clock Low Power: 2.5mA (400ksps) to perform successive-approximation analog-to-digital conversions. SPI/QSPI/MICROWIRE 3-Wire Serial-Interface Low power, ease of use, and small package size make Pin-Compatible, High-Speed Upgrades to these converters ideal for remote-sensor and data-acqui- MAX1240/MAX1241 sition applications or for other circuits with demanding 8-Pin SO Package 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. Ordering Information Applications PIN- SUPPLY PART TEMP RANGE Portable Data Logging PACKAGE VOLTAGE (V) Data Acquisition MAX1284BCSA+ 0C to +70C 8 SO 5 Medical Instruments MAX1284BESA+ -40C to +85C 8 SO 5 MAX1285BCSA+ 0C to +70C 8 SO 2.7 to 3.6 Battery-Powered Instruments MAX1285BESA+ -40C to +85C 8 SO 2.7 to 3.6 Pen Digitizers +Denotes a lead(Pb)-free/RoHS-compliant package. Process Control Pin Configuration Functional Diagram V DD TOP VIEW 1 + 7 CS V DD 1 SCLK 8 8 SCLK AIN 2 7 CS 3 MAX1284 CONTROL INT SHDN SHDN 3 DOUT 6 MAX1285 LOGIC CLOCK OUTPUT 6 REF 4 5 GND DOUT SHIFT REGISTER SO 12-BIT 2 T/H AIN SAR MAX1284 +2.5V REFERENCE SPI and QSPI are trademarks of Motorola, Inc. 4 MAX1285 REF MICROWIRE is a trademark of National Semiconductor Corp. 5 GND 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. EVALUATION KIT AVAILABLE400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0.3V to +6V Operating Temperature Ranges DD AIN to GND................................................-0.3V to (V + 0.3V) MAX1284BCSA/MAX1285BCSA .......................0C to +70C DD REF to GND ...............................................-0.3V to (V + 0.3V) MAX1284BESA/MAX1285BESA .....................-40C to +85C DD Digital Inputs to GND...............................................-0.3V to +6V Storage Temperature Range............................-60C to +150C DOUT to GND............................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s)................................+300C DD DOUT Current..................................................................25mA Soldering Temperature (reflow)......................................+260C Continuous Power Dissipation (T = +70C) A 8-Pin SO (derate 5.88mW/C above +70C) ..............471mW 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 CHARACTERISTICSMAX1284 (V = +4.5V to +5.5V f = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7F capacitor at REF, T = T to DD SCLK A MIN T unless otherwise noted. Typical values are at T = +25C.) MAX, A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 12 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 0.8 ppm/C Coefficient DYNAMIC SPECIFICATIONS (100kHz sine wave, 2.5V , clock = 6.4MHz) P-P Signal-to-Noise Plus Distortion SINAD 70 dB Ratio Total Harmonic Distortion THD Up to the 5th harmonic -80 dB Spurious-Free Dynamic Range SFDR 80 dB Intermodulation Distortion IMD f = 99Hz, f = 102Hz 76 dB IN1 IN2 Full-Power Bandwidth -3dB point 6 MHz Full-Linear Bandwidth SINAD > 68dB 350 kHz CONVERSION RATE Conversion Time (Note 4) t 2.5 s CONV Track/Hold Acquisition Time t 468 ns ACQ Aperture Delay 10 ns Aperture Jitter < 50 ps Serial Clock Frequency t 0.5 6.4 MHz SCLK Duty Cycle 40 60 % ANALOG INPUT (AIN) Input Voltage Range V 0 2.5 V AIN Input Capacitance 18 pF 2 MAX1284/MAX1285