MAX1268BCEG

19-2722; Rev 0; 04/03 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description The MAX1266/MAX1268 low-power, 12-bit analog-todigital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an on-chip clock, +2.5V internal reference, and a high-speed 12-bit parallel interface. They operate with a single +5V analog supply. Power consumption is only 10mW at the maximum sampling rate of 420ksps. Two software-selectable powerdown modes enable the MAX1266/MAX1268 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can reduce supply below 10µA at lower sampling rates. Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1266 has six input channels and the MAX1268 has two (three input channels and one input channel, respectively, when in pseudo-differential mode). Excellent dynamic performance and low power, combined with ease of use and small package size, make these converters ideal for battery-powered and dataacquisition applications or for other circuits with demanding power-consumption and space requirements. The MAX1266 is offered in a 28-pin QSOP package, while the MAX1268 is available in a 24-pin QSOP. For pin-compatible +3V, 12-bit versions, see the MAX1265/MAX1267. o 12-Bit Resolution, ±0.5 LSB Linearity o Single +5V Operation o Internal +2.5V Reference o Software-Configurable Analog Input Multiplexer 6-Channel Single Ended/ 3-Channel Pseudo-Differential (MAX1266) 2-Channel Single Ended/ 1-Channel Pseudo-Differential (MAX1268) o Software-Configurable Unipolar/Bipolar Analog Inputs o Low Current 2.8mA (420ksps) 1.0mA (100ksps) 400µA (10ksps) 2µA (Shutdown) o Internal 6MHz Full-Power Bandwidth Track/Hold o Parallel 12-Bit Interface o Small Footprint 28-Pin QSOP (MAX1266) 24-Pin QSOP (MAX1268) Features MAX1266/MAX1268 Pin Configurations TOP VIEW Applications Industrial Control Systems Energy Management Data-Acquisition Systems Data Logging Patient Monitoring Touch Screens D9 1 D8 2 D7 3 D6 4 D5 5 24 D10 23 D11 22 VDD 21 REF 20 REFADJ Ordering Information PART MAX1266ACEI MAX1266BCEI MAX1266AEEI MAX1266BEEI MAX1268ACEG MAX1268BCEG TEMP RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 28 QSOP 28 QSOP 28 QSOP 28 QSOP 24 QSOP 24 QSOP 24 QSOP 24 QSOP INL (LSB) ±0.5 ±1 ±0.5 ±1 ±0.5 ±1 ±0.5 ±1 D4 6 D3 7 D2 8 D1 9 D0 10 INT 11 RD 12 MAX1268 19 GND 18 COM 17 CH0 16 CH1 15 CS 14 CLK 13 WR QSOP Pin Configurations continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. MAX1268AEEG -40°C to +85°C MAX1268BEEG -40°C to +85°C ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface MAX1266/MAX1268 ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CH0–CH5, COM to GND ............................-0.3V to (VDD + 0.3V) REF, REFADJ to GND.................................-0.3V to (VDD + 0.3V) Digital Inputs to GND ...............................................-0.3V to +6V Digital Outputs (D0–D11, INT) to GND.......-0.3V to (VDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 24-Pin QSOP (derate 9.5mW/°C above +70°C)..........762mW 28-Pin QSOP (derate 8.0mW/°C above +70°C)..........667mW Operating Temperature Ranges MAX1266_C_ _/MAX1268_C_ _ .........................0°C to +70°C MAX1266_E_ _/MAX1268_E_ _ ......................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VDD = +5V ±10%, COM = GND, REFADJ = VDD, VREF = +2.5V, 4.7µF capacitor at REF pin, fCLK = 7.6MHz (50% duty cycle), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error Gain Error Gain Temperature Coefficient Channel-to-Channel Offset Matching Signal-to-Noise Plus Distortion Total Harmonic Distortion (Including 5th-Order Harmonic) Spurious-Free Dynamic Range Intermodulation Distortion Channel-to-Channel Crosstalk Full-Linear Bandwidth Full-Power Bandwidth CONVERSION RATE External clock mode Conversion Time (Note 5) T/H Acquisition Time Aperture Delay Aperture Jitter External Clock Frequency Duty Cycle 2 fCLK tCONV tACQ External acquisition or external clock mode External acquisition or external clock mode Internal acquisition/internal clock mode 0.1 30 25