MAX1295BEEI

19-1530; Rev 0; 9/99 KIT ATION EVALU ABLE AVAIL 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface General Description Features o 12-Bit Resolution, ±0.5LSB Linearity o +3V Single-Supply Operation o Internal +2.5V Reference o Software-Configurable Analog Input Multiplexer 6-Channel Single-Ended/ 3-Channel Pseudo-Differential (MAX1295) 2-Channel Single-Ended/ 1-Channel Pseudo-Differential (MAX1297) o Software-Configurable Unipolar/Bipolar Analog Inputs o Low Current 1.8mA (265ksps) 1.0mA (100ksps) 400µA (10ksps) 2µA (shutdown) o Internal 3MHz Full-Power Bandwidth Track/Hold o Parallel 12-Bit Interface o Small Footprint 28-Pin QSOP (MAX1295) 24-Pin QSOP (MAX1297) MAX1295/MAX1297 The MAX1295/MAX1297 low-power, 12-bit analog-todigital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), on-chip clock, +2.5V internal reference, and high-speed 12-bit parallel interface. They operate with a single +2.7V to +3.6V analog supply. Power consumption is only 5.4mW at the maximum sampling rate of 265ksps. Two software-selectable power-down modes enable the MAX1295/MAX1297 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can reduce supply current 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 MAX1295 has six input channels and the MAX1297 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 data-acquisition applications or for other circuits with demanding powerconsumption and space requirements. The MAX1295 is offered in a 28-pin QSOP package, while the MAX1297 comes in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1294/MAX1296 data sheet. Pin Configurations TOP VIEW Applications Industrial Control Systems Energy Management Data-Acquisition Systems Data Logging Patient Monitoring Touchscreens D9 1 D8 2 D7 3 D6 4 D5 5 D4 6 28 D10 27 D11 26 VDD 25 REF 24 REFADJ MAX1295 23 GND 22 COM 21 CH0 20 CH1 19 CH2 18 CH3 17 CH4 16 CH5 15 CS Ordering Information PART MAX1295ACEI MAX1295BCEI MAX1295AEEI MAX1295BEEI MAX1297ACEG MAX1297BCEG 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 D3 7 D2 8 D1 9 D0 10 INT 11 RD 12 WR 13 CLK 14 MAX1297AEEG -40°C to +85°C MAX1297BEEG -40°C to +85°C QSOP Pin Configurations continued at end of data sheet. Typical Operating Circuits appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. 265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface MAX1295/MAX1297 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 8.00mW/°C above +70°C)........667mW Operating Temperature Ranges MAX1295_C_ _ /MAX1297_C_ _ ........................0°C to +70°C MAX1295_E_ _ /MAX1297_E_ _ ......................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+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 = +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