MAX1261/MAX1263 19-2719 Rev 0 04/03 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description Features The MAX1261/MAX1263 low-power, 12-bit analog-to- 12-Bit Resolution, 0.5 LSB Linearity digital converters (ADCs) feature a successive-approxi- +3V Single Operation mation ADC, automatic power-down, fast wake-up User-Adjustable Logic Level (+1.8V to +3.6V) (2s), an on-chip clock, +2.5V internal reference, and a high-speed, byte-wide parallel interface. They operate Internal +2.5V Reference with a single +3V analog supply and feature a V LOGIC Software-Configurable, Analog Input Multiplexer pin that allows them to interface directly with a +1.8V to 8-Channel Single Ended/ +5.5V digital supply. 4-Channel Pseudo-Differential (MAX1261) Power consumption is only 5.7mW (V = V ) at DD LOGIC 4-Channel Single Ended/ the maximum sampling rate of 250ksps. Two software- 2-Channel Pseudo-Differential (MAX1263) selectable power-down modes enable the MAX1261/ Software-Configurable, Unipolar/Bipolar Inputs MAX1263 to be shut down between conversions accessing the parallel interface returns them to normal Low Power operation. Powering down between conversions can 1.9mA (250ksps) cut supply current to under 10A at reduced sampling 1.0mA (100ksps) rates. 400A (10ksps) Both devices offer software-configurable analog inputs 2A (Shutdown) for unipolar/bipolar and single-ended/pseudo-differen- Internal 3MHz Full-Power Bandwidth Track/Hold tial operation. In single-ended mode, the MAX1261 has Byte-Wide Parallel (8 + 4) Interface eight input channels and the MAX1263 has four input channels (four and two input channels, respectively, Small Footprint when in pseudo-differential mode). 28-Pin QSOP (MAX1261) Excellent dynamic performance and low power, com- 24-Pin QSOP (MAX1263) bined with ease of use and small package size, make these converters ideal for battery-powered and data- Pin Configurations acquisition applications or for other circuits with demand- ing power consumption and space requirements. TOP VIEW The MAX1261 is available in a 28-pin QSOP package, HBEN 1 28 V LOGIC while the MAX1263 is available in a 24-pin QSOP. For D7 2 27 V DD pin-compatible +5V, 12-bit versions, refer to the MAX1262/MAX1264 data sheet. D6 3 26 REF D5 4 25 REFADJ Applications D4 5 24 GND MAX1261 Industrial Control Systems Data Logging D3/D11 6 23 COM 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 RD 11 18 CH4 WR 12 17 CH5 INL PART TEMP RANGE PIN-PACKAGE (LSB) CLK 13 16 CH6 MAX1261ACEI 0C to +70C 28 QSOP 0.5 CS 14 15 CH7 0C to +70C MAX1261BCEI 28 QSOP 1 QSOP -40C to +85C MAX1261AEEI 28 QSOP 0.5 Pin Configurations continued at end of data sheet. -40C to +85C MAX1261BEEI 28 QSOP 1 Ordering Information continued at end of data sheet. 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.250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A V to GND.........................................................-0.3V to +6V 24-Pin QSOP (derate 9.5mW/C above +70C) ..........762mW LOGIC CH0CH7, COM to GND............................-0.3V to (V + 0.3V) 28-Pin QSOP (derate 8.0mW/C above +70C) ..........667mW DD REF, REFADJ to GND ................................-0.3V to (V + 0.3V) Operating Temperature Ranges DD Digital Inputs to GND ...............................................-0.3V to +6V MAX1261 C /MAX1263 C ..........................0C to +70C Digital Outputs (D0D11, INT) to GND...-0.3V to (V + 0.3V) MAX1261 E /MAX1263 E .......................-40C to +85C LOGIC Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 = V = +2.7V to +3.6V, COM = GND, REFADJ = V , V = +2.5V, 4.7F capacitor at REF pin, f = 4.8MHz (50% duty DD LOGIC DD REF CLK cycle) 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 , 250ksps, 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, V = 2.5V (Note 4) -78 dB IN IN P-P 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 MAX1261/MAX1263