MAX1263BEEG+

19-2719; Rev 0; 04/03 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface 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 MAX1261 is available in a 28-pin QSOP package, while the MAX1263 is available in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1262/MAX1264 data sheet. Applications Features ♦ 12-Bit Resolution, ±0.5 LSB Linearity ♦ +3V Single Operation ♦ User-Adjustable Logic Level (+1.8V to +3.6V) ♦ Internal +2.5V Reference ♦ Software-Configurable, Analog Input Multiplexer 8-Channel Single Ended/ 4-Channel Pseudo-Differential (MAX1261) 4-Channel Single Ended/ 2-Channel Pseudo-Differential (MAX1263) ♦ Software-Configurable, Unipolar/Bipolar Inputs ♦ Low Power 1.9mA (250ksps) 1.0mA (100ksps) 400µA (10ksps) 2µA (Shutdown) ♦ Internal 3MHz Full-Power Bandwidth Track/Hold ♦ Byte-Wide Parallel (8 + 4) Interface ♦ Small Footprint 28-Pin QSOP (MAX1261) 24-Pin QSOP (MAX1263) Pin Configurations TOP VIEW 28 VLOGIC HBEN 1 D7 2 27 VDD D6 3 26 REF D5 4 25 REFADJ D4 5 24 GND MAX1261 Industrial Control Systems Data Logging D3/D11 6 Energy Management Patient Monitoring D2/D10 7 22 CH0 Data-Acquisition Systems Touch Screens D1/D9 8 21 CH1 D0/D8 9 20 CH2 INT 10 19 CH3 Ordering Information PART RD 11 18 CH4 INL (LSB) WR 12 17 CH5 CLK 13 16 CH6 CS 14 15 CH7 TEMP RANGE PIN-PACKAGE MAX1261ACEI 0°C to +70°C 28 QSOP ±0.5 MAX1261BCEI 0°C to +70°C 28 QSOP ±1 MAX1261AEEI -40°C to +85°C 28 QSOP ±0.5 MAX1261BEEI -40°C to +85°C 28 QSOP ±1 Ordering Information continued at end of data sheet. 23 COM QSOP Pin Configurations continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX1261/MAX1263 General Description The MAX1261/MAX1263 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, byte-wide parallel interface. They operate with a single +3V analog supply and feature a VLOGIC pin that allows them to interface directly with a +1.8V to +5.5V digital supply. Power consumption is only 5.7mW (VDD = VLOGIC) at the maximum sampling rate of 250ksps. Two softwareselectable power-down modes enable the MAX1261/ MAX1263 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can cut supply current to under 10µA at reduced sampling rates. Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1261 has eight input channels and the MAX1263 has four input channels (four and two input channels, respectively, when in pseudo-differential mode). MAX1261/MAX1263 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V VLOGIC to GND.........................................................-0.3V to +6V CH0–CH7, 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 (VLOGIC + 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 MAX1261_C_ _/MAX1263_C_ _ ..........................0°C to +70°C MAX1261_E_ _/MAX1263_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 = VLOGIC = +2.7V to +3.6V, COM = GND, REFADJ = VDD, VREF = +2.5V, 4.7µF capacitor at REF pin, fCLK = 4.8MHz (50% duty cycle); TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution RES Relative Accuracy (Note 2) INL Differential Nonlinearity DNL 12 Bits MAX126_A ±0.5 MAX126_B ±1 No missing codes overtemperature ±1 LSB ±4 LSB Offset Error Gain Error ±4 (Note 3) LSB LSB Gain Temperature Coefficient ±2.0 ppm/°C Channel-to-Channel Offset Matching ±0.2 LSB DYNAMIC SPECIFICATIONS (fIN(sine wave) = 50kHz, VIN = 2.5VP-P, 250ksps, external fCLK = 4.8MHz, bipolar input mode) Signal-to-Noise Plus Distortion SINAD Total Harmonic Distortion (Including 5th-Order Harmonic) THD Spurious-Free Dynamic Range SFDR 67 70 dB -78 80 dB dB fIN1 = 49kHz, fIN2 = 52kHz 76 dB Channel-to-Channel Crosstalk fIN = 125kHz, VIN = 2.5VP-P (Note 4) -78 dB Full-Linear Bandwidth SINAD > 68dB 250 kHz Full-Power Bandwidth -3dB rolloff 3 MHz Intermodulation Distortion IMD CONVERSION RATE Conversion Time (Note 5) Track/Hold Acquisition Time tCONV External clock mode 3.3 External acquisition/internal clock mode 2.5 3.0 3.5 Internal acquisition/internal clock mode 3.2 3.6 4.1 tACQ 625 µs ns Aperture Delay External acquisition or external clock mode 50 ns Aperture Jitter External acquisition or external clock mode Internal acquisition/internal clock mode