MAX1294/MAX1296 19-1533 Rev 2 12/02 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description Features The MAX1294/MAX1296 low-power, 12-bit analog-to- 12-Bit Resolution, 0.5 LSB Linearity digital converters (ADCs) feature a successive-approxi- Single +5V Operation mation ADC, automatic power-down, fast wake-up (2s), an on-chip clock, +2.5V internal reference, and a Internal +2.5V Reference high-speed 12-bit parallel interface. They operate with Software-Configurable Analog Input Multiplexer a single +5V analog supply. 6-Channel Single-Ended/ Power consumption is only 10mW at the maximum sam- 3-Channel Pseudo-Differential (MAX1294) pling rate of 420ksps. Two software-selectable power- down modes enable the MAX1294/MAX1296 to be shut 2-Channel Single-Ended/ down between conversions accessing the parallel 1-Channel Pseudo-Differential (MAX1296) interface returns them to normal operation. Powering Software-Configurable Unipolar/Bipolar down between conversions can reduce supply below Analog Inputs 10A at lower sampling rates. Low Current Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential 2.8mA (420ksps) operation. In single-ended mode, the MAX1294 has six 1.0mA (100ksps) input channels and the MAX1296 has two (three input 400A (10ksps) channels and one input channel, respectively, when in 2A (Shutdown) pseudo-differential mode). Internal 6MHz Full-Power Bandwidth Track/Hold Excellent dynamic performance and low power, com- Parallel 12-Bit Interface bined with ease of use and small package size, make these converters ideal for battery-powered and data- Small Footprint acquisition applications or for other circuits with demand- 28-Pin QSOP (MAX1294) ing power-consumption and space requirements. 24-Pin QSOP (MAX1296) The MAX1294/MAX1296 tri-states INT when CS goes high. Refer to MAX1266/MAX1268 if tri-stating INT is not Pin Configurations desired. TOP VIEW The MAX1294 is offered in a 28-pin QSOP package, while the MAX1296 is available in a 24-pin QSOP. For pin-com- D9 1 24 D10 patible +3V, 12-bit versions, see the MAX1295/MAX1297. D8 2 23 D11 Applications D7 3 22 V DD Industrial Control Systems Data Logging D6 4 21 REF Energy Management Patient Monitoring D5 5 20 REFADJ Data-Acquisition Systems Touchscreens MAX1296 D4 6 19 GND Ordering Information D3 7 18 COM INL PART TEMP RANGE PIN-PACKAGE D2 8 17 CH0 (LSB) D1 9 16 CH1 MAX1294ACEI 0C to +70C 28 QSOP 0.5 D0 10 15 CS MAX1294BCEI 0C to +70C 28 QSOP 1 MAX1294AEEI -40C to +85C 28 QSOP 0.5 INT 11 14 CLK MAX1294BEEI -40C to +85C 28 QSOP 1 RD 12 13 WR MAX1296ACEG 0C to +70C 24 QSOP 0.5 QSOP MAX1296BCEG 0C to +70C 24 QSOP 1 MAX1296AEEG -40C to +85C 24 QSOP 0.5 Pin Configurations continued at end of data sheet. MAX1296BEEG -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. EVALUATION KIT AVAILABLE420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Ranges DD CH0CH5, COM to GND............................-0.3V to (V + 0.3V) MAX1294 C /MAX1296 C .........................0C to +70C DD REF, REFADJ to GND.................................-0.3V to (V + 0.3V) MAX1294 E /MAX1296 E ......................-40C to +85C DD Digital Inputs to GND ...............................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C Digital Outputs (D0D11, INT) to GND.......-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Continuous Power Dissipation (T = +70C) A 24-Pin QSOP (derate 9.5mW/C above +70C)..........762mW 28-Pin QSOP (derate 8.00mW/C above +70C)........667mW 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 = +5V 10%, COM = GND, REFADJ = V , V = +2.5V, 4.7F capacitor at REF pin, f = 7.6MHz (50% duty cycle), DD DD REF CLK T = T to T , unless otherwise noted. Typical values are at T = +25C.) A A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution RES 12 Bits MAX129 A 0.5 Relative Accuracy (Note 2) INL LSB MAX129 B 1 Differential Nonlinearity DNL No missing codes over temperature 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 , 420ksps, external f = 7.6MHz, bipolar input mode) IN(sine wave) IN P-P CLK Signal-to-Noise Plus Distortion SINAD 67 70 dB Total Harmonic Distortion THD -80 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 = 175kHz (Note 4) -78 dB IN Full-Linear Bandwidth SINAD > 68dB 350 kHz Full-Power Bandwidth -3dB rolloff 6 MHz CONVERSION RATE External clock mode 2.1 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 T/H Acquisition Time t 400 ns ACQ Aperture Delay External acquisition or external clock mode 25 ns External acquisition or external clock mode <50 Aperture Jitter ps Internal acquisition/internal clock mode <200 External Clock Frequency f 0.1 7.6 MHz CLK Duty Cycle 30 70 % 2 MAX1294/MAX1296