MAX1290BCEI

19-1531; Rev 3; 12/02 KIT ATION EVALU ABLE AVAIL 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description The MAX1290/MAX1292 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. The devices operate with a single +5V analog supply and feature a VLOGIC pin that allows them to interface directly with a +2.7V to +5.5V digital supply. Power consumption is only 10mW (VDD = VLOGIC) at a 400ksps max sampling rate. Two software-selectable power-down modes enable the MAX1290/MAX1292 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 MAX1290 has eight input channels and the MAX1292 has four input channels (four and two 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 MAX1290/MAX1292 tri-states INT when CS goes high. Refer to MAX1262/MAX1264 if tri-stating INT is not desired. The MAX1290 is available in a 28-pin QSOP package, while the MAX1292 comes in a 24-pin QSOP. For pincompatible +3V, 12-bit versions, refer to the MAX1291/ MAX1293 data sheet. o 12-Bit Resolution, ±0.5 LSB Linearity o +5V Single-Supply Operation o User-Adjustable Logic Level (+2.7V to +5.5V) o Internal +2.5V Reference o Software-Configurable Analog Input Multiplexer 8-Channel Single-Ended/ 4-Channel Pseudo-Differential (MAX1290) 4-Channel Single-Ended/ 2-Channel Pseudo-Differential (MAX1292) o Software-Configurable Unipolar/Bipolar Analog Inputs o Low Current: 2.5mA (400ksps) 1.0mA (100ksps) 400µA (10ksps) 2µA (Shutdown) o Internal 6MHz Full-Power Bandwidth Track/Hold o Byte-Wide Parallel (8 + 4) Interface o Small Footprint: 28-Pin QSOP (MAX1290) 24-Pin QSOP (MAX1292) Features MAX1290/MAX1292 Pin Configurations TOP VIEW HBEN 1 D7 2 D6 3 D5 4 D4 5 D3/D11 6 D2/D10 7 D1/D9 8 D0/D8 9 INT 10 RD 11 WR 12 24 VLOGIC 23 VDD 22 REF 21 REFADJ 20 GND Applications Industrial Control Systems Energy Management Data-Acquisition Systems Data Logging Patient Monitoring Touchscreens MAX1292 19 COM 18 CH0 17 CH1 16 CH2 15 CH3 14 CS 13 CLK Ordering Information PART MAX1290ACEI MAX1290BCEI MAX1290AEEI MAX1290BEEI 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 QSOP Pin Configurations continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. Ordering Information continued 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 Maxim’s website at www.maxim-ic.com. 400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface MAX1290/MAX1292 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 MAX1290_C_ _/MAX1292_C_ _ ....................... 0°C to +70°C MAX1290_E_ _/MAX1292_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 = +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 (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) 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