MAX1108/MAX1109 19-1399 Rev 1 6/03 Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs General Description Features The MAX1108/MAX1109 low-power, 8-bit, dual-channel, Single Supply: +2.7V to +3.6V (MAX1108) analog-to-digital converters (ADCs) feature an internal +4.5V to +5.5V (MAX1109) track/hold (T/H) voltage reference, clock, and serial inter- Low Power: 105A at +3V and 50ksps face. The MAX1108 is specified from +2.7V to +3.6V and 0.5A in Power-Down Mode consumes only 105A. The MAX1109 is specified from +4.5V to +5.5V and consumes only 130A. The analog Software-Configurable Unipolar or Bipolar Inputs inputs are software configurable, allowing unipolar/bipolar Input Voltage Range: 0 to V and single-ended/differential operation battery monitor- DD ing capability is also included. Internal Track/Hold The full-scale analog input range is determined by the Internal Reference: +2.048V (MAX1108) internal reference of +2.048V (MAX1108) or +4.096V +4.096V (MAX1109) (MAX1109), or by an externally applied reference rang- ing from 1V to V . The MAX1108/MAX1109 also feature DD Reference Input Range: 1V to V DD a software power-down mode that reduces power con- SPI/QSPI/MICROWIRE-Compatible Serial Interface sumption to 0.5A when the device is not in use. The 4-wire serial interface directly connects to SPI, QSPI, V Monitoring Mode DD and MICROWIRE devices without external logic. Small 10-Pin MAX Package Conversions up to 50ksps are performed using either the internal clock or an external serial-interface clock. The MAX1108 and MAX1109 are available in a 10-pin Ordering Information MAX package with a footprint that is just 20% of an PART TEMP RANGE PIN-PACKAGE 8-pin plastic DIP. MAX1108CUB 0C to +70C 10 MAX Applications MAX1108EUB -40C to +85C 10 MAX Portable Data Logging MAX1109CUB 0C to +70C 10 MAX Hand-Held Measurement Devices MAX1109EUB -40C to +85C 10 MAX Medical Instruments System Diagnostics Functional Diagram Solar-Powered Remote Systems V DD 420mA-Powered Remote Systems CS SCLK Receive-Signal Strength Indicators OUTPUT INPUT SHIFT SHIFT DOUT DIN Pin Configuration REGISTER REGISTER MAX1108 MAX1109 INTERNAL TOP VIEW OSCILLATOR CONTROL LOGIC V 1 10 SCLK DD CH0 SAR ANALOG T/H CH0 2 9 DOUT INPUT CH1 MAX1108 MUX CH1 3 8 DIN COM MAX1109 CHARGE REDISTRIBUTION GND 4 7 CS INTERNAL DAC REFERENCE REF 5 6 COM REF MAX GND SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 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.Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Ranges DD CH0, CH1, COM, REF, DOUT to GND .......-0.3V to (V + 0.3V) MAX110 CUB ......................................................0C to +70C DD DIN, SCLK, CS to GND ............................................-0.3V to +6V MAX110 EUB ...................................................-40C to +85C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 10-pin MAX (derate 5.6mW/C above +70C) ............444mW 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 CHARACTERISTICSMAX1108 (V = +2.7V to +3.6V unipolar input mode COM = GND, f = 500kHz, external clock mode (50% duty cycle) 10 clocks/conver- DD SCLK sion cycle (50ksps) 1F capacitor at REF, external +2.048V reference at REF T = T to T unless otherwise noted. Typical A MIN MAX values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution 8 bits V = 2.7V to 3.6V 0.15 0.5 DD Relative Accuracy (Note 1) INL LSB V = 5.5V (Note 2) 0.2 DD Differential Nonlinearity DNL No missing codes over temperature 1 LSB V = 2.7V to 3.6V 0.2 1 DD Offset Error LSB V = 5.5V (Note 2) 0.5 DD Gain Error (Note 3) 1 LSB Gain Temperature Coefficient 0.8 ppm/C T = +25C 1 A Total Unadjusted Error TUE LSB T = T to T 0.5 A MIN MAX Channel-to-Channel 0.1 LSB Offset Matching V / 2 Sampling Accuracy 50 mV DD DYNAMIC PERFORMANCE (10kHz sine-wave input, 2.048Vp-p, 50ksps, 500kHz external clock) Signal-to-Noise Plus Distortion SINAD 49 dB Total Harmonic Distortion THD -70 dB (up to the 5th harmonic) Spurious-Free Dynamic Range SFDR 68 dB Small-Signal Bandwidth BW -3dB rolloff 1.5 MHz -3dB Full-Power Bandwidth 0.8 MHz ANALOG INPUTS Unipolar input, V = 0 0V COM REF Input Voltage Range (Note 4) V V CH Bipolar input, V or V = V / 2, COM CH1 REF V / 2 REF referenced to COM or CH1 On/off-leakage current, Multiplexer Leakage Current 0.01 1 A V or V = 0 or V COM CH DD Input Capacitance C 18 pF IN 2 MAX1108/MAX1109