MAX1265/MAX1267 19-2721 Rev 0 04/03 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description Features The MAX1265/MAX1267 low-power, 12-bit analog-to- 12-Bit Resolution, 0.5 LSB Linearity digital converters (ADCs) feature a successive-approxi- +3V Single-Supply Operation mation ADC, automatic power-down, fast wake-up Internal +2.5V Reference (2s), an on-chip clock, +2.5V internal reference, and a high-speed 12-bit parallel interface. They operate with Software-Configurable Analog Input Multiplexer a single +2.7V to +3.6V analog supply. 6-Channel Single Ended/ Power consumption is only 5.4mW at the maximum 3-Channel Pseudo Differential (MAX1265) sampling rate of 265ksps. Two software-selectable 2-Channel Single Ended/ power-down modes enable the MAX1265/MAX1267 to 1-Channel Pseudo Differential (MAX1267) be shut down between conversions accessing the par- Software-Configurable Unipolar/Bipolar allel interface returns them to normal operation. Analog Inputs Powering down between conversions can reduce sup- ply current below 10A at lower sampling rates. Low Current 1.9mA (265ksps) Both devices offer software-configurable analog inputs 1.0mA (100ksps) for unipolar/bipolar and single-ended/pseudo-differen- tial operation. In single-ended mode, the MAX1265 has 400A (10ksps) six input channels and the MAX1267 has two (three 2A (Shutdown) input channels and one input channel, respectively, Internal 3MHz Full-Power Bandwidth Track/Hold when in pseudo-differential mode). Parallel 12-Bit Interface Excellent dynamic performance and low power, com- Small Footprint bined with ease of use and small package size, make 28-Pin QSOP (MAX1265) these converters ideal for battery-powered and data- acquisition applications or for other circuits with demand- 24-Pin QSOP (MAX1267) ing power-consumption and space requirements. The MAX1265 is offered in a 28-pin QSOP package, while the Pin Configurations MAX1267 comes in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1266/MAX1268 TOP VIEW data sheet. D9 1 28 D10 D8 2 27 D11 Applications D7 3 26 V DD Industrial Control Systems Data Logging D6 4 25 REF Energy Management Patient Monitoring D5 5 24 REFADJ MAX1265 Data-Acquisition Systems Touch Screens D4 6 23 GND D3 7 22 COM Ordering Information D2 8 21 CH0 INL PART TEMP RANGE PIN-PACKAGE D1 9 20 CH1 (LSB) D0 10 19 CH2 MAX1265ACEI 0C to +70C 28 QSOP 0.5 INT 11 18 CH3 MAX1265BCEI 0C to +70C 28 QSOP 1 MAX1265AEEI -40C to +85C 28 QSOP 0.5 RD 12 17 CH4 MAX1265BEEI -40C to +85C 28 QSOP 1 WR 13 16 CH5 MAX1267ACEG 0C to +70C 24 QSOP 0.5 CLK 14 15 CS MAX1267BCEG 0C to +70C 24 QSOP 1 QSOP MAX1267AEEG -40C to +85C 24 QSOP 0.5 Pin Configurations continued at end of data sheet. MAX1267BEEG -40C to +85C 24 QSOP 1 Typical Operating Circuits appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V 28-Pin QSOP (derate 8.0mW/C above +70C)..........667mW DD CH0CH5, COM to GND............................-0.3V to (V + 0.3V) Operating Temperature Ranges DD REF, REFADJ to GND.................................-0.3V to (V + 0.3V) MAX1265 C /MAX1267 C ........................0C to +70C DD Digital Inputs to GND ...............................................-0.3V to +6V MAX1265 E /MAX1267 E ......................-40C to +85C Digital Outputs (D0D11, INT) to GND.......-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 24-Pin QSOP (derate 9.5mW/C above +70C)..........762mW 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 = +2.7V to +3.6V, COM = GND, REFADJ = V , V = +2.5V, 4.7F capacitor at REF pin, f = 4.8MHz (50% duty cycle), DD DD REF CLK T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution RES 12 Bits MAX126 A 0.5 Relative Accuracy (Note 2) INL LSB MAX126 B 1 Differential Nonlinearity DNL No missing codes overtemperature 1 LSB Offset Error 4 LSB Gain Error (Note 3) 4 LSB Gain Temperature Coefficient 2.0 ppm/C Channel-to-Channel Offset 0.2 LSB Matching DYNAMIC SPECIFICATIONS (f = 50kHz, V = 2.5V , 265ksps, external f = 4.8MHz, bipolar input mode) IN(sine-wave) IN P-P CLK Signal-to-Noise Plus Distortion SINAD 67 70 dB Total Harmonic Distortion THD -78 dB (Including 5th-Order Harmonic) Spurious-Free Dynamic Range SFDR 80 dB Intermodulation Distortion IMD f = 49kHz, f = 52kHz 76 dB IN1 IN2 Channel-to-Channel Crosstalk f = 125kHz (Note 4) -78 dB IN Full-Linear Bandwidth SINAD > 68dB 250 kHz Full-Power Bandwidth -3dB rolloff 3 MHz CONVERSION RATE External clock mode 3.3 Conversion Time (Note 5) t External acquisition/internal clock mode 2.5 3.0 3.5 s CONV Internal acquisition/internal clock mode 3.2 3.6 4.1 Track/Hold Acquisition Time t 625 ns ACQ Aperture Delay External acquisition or external clock mode 50 ns External acquisition or external clock mode <50 Aperture Jitter ps Internal acquisition/internal clock mode <200 External Clock Frequency f 0.1 4.8 MHz CLK Duty Cycle 30 70 % 2 MAX1265/MAX1267