MAX1291ACEI

19-1532; Rev 1; 2/00 KIT ATION EVALU BLE AVAILA 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description The MAX1291/MAX1293 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 MAX1291/ MAX1293 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 MAX1291 has 8 input channels and the MAX1293 has 4 input channels (4 and 2 input channels, 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 MAX1291 is available in a 28-pin QSOP package, while the MAX1293 is available in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1290/MAX1292 data sheet. o 12-Bit Resolution, ±0.5LSB Linearity o +3V Single Operation o User-Adjustable Logic Level (+1.8V to +3.6V) o Internal +2.5V Reference o Software-Configurable, Analog Input Multiplexer 8-Channel Single-Ended/ 4-Channel Pseudo-Differential (MAX1291) 4-Channel Single-Ended/ 2-Channel Pseudo-Differential (MAX1293) o Software-Configurable, Unipolar/Bipolar Inputs o Low Power: 1.9mA (250ksps) 1.0mA (100ksps) 400µA (10ksps) 2µA (Shutdown) o Internal 3MHz Full-Power Bandwidth Track/Hold o Byte-Wide Parallel (8+4) Interface o Small Footprint: 28-Pin QSOP (MAX1291) 24-Pin QSOP (MAX1293) Features MAX1291/MAX1293 Pin Configurations TOP VIEW HBEN 1 D7 2 D6 3 D5 4 28 VLOGIC 27 VDD 26 REF 25 REFADJ 24 GND Applications Industrial Control Systems Energy Management Data-Acquisition Systems Data Logging Patient Monitoring Touch Screens D4 5 D3/D11 6 D2/D10 7 D1/D9 8 D0/D8 9 MAX1291 23 COM 22 CH0 21 CH1 20 CH2 19 CH3 18 CH4 17 CH5 16 CH6 15 CH7 Ordering Information PART MAX1291ACEI MAX1291BCEI MAX1291AEEI MAX1291BEEI TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 28 QSOP 28 QSOP 28 QSOP 28 QSOP INL (LSB) ±0.5 ±1 ±0.5 ±1 INT 10 RD 11 WR 12 CLK 13 CS 14 QSOP Pin Configurations continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. 1 Ordering Information continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. 250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface MAX1291/MAX1293 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 8.00mW/°C above +70°C) .........667mW Operating Temperature Ranges MAX1291_C_ _/MAX1293_C_ _ ..............................0°C to +70°C MAX1291_E_ _/MAX1293_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 DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error Gain Error (Note 3) 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) Track/Hold 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 50