MAX192 19-0247 Rev. 1 4/97 Low-Power, 8-Channel, Serial 10-Bit ADC 8-Channel Single-Ended or 4-Channel Differential General Description Inputs The MAX192 is a low-cost, 10-bit data-acquisition system Single +5V Operation that combines an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion Low Power: 1.5mA (operating) speed and ultra-low power consumption. The device 2A (power-down) operates with a single +5V supply. The analog inputs are Internal Track/Hold, 133kHz Sampling Rate software configurable for single-ended and differential Internal 4.096V Reference (unipolar/bipolar) operation. 4-Wire Serial Interface is Compatible The 4-wire serial interface connects directly to SPI, with SPI, QSPI, Microwire, and TMS320 QSPI, and Microwire devices, without using external logic. A serial strobe output allows direct connection to 20-Pin DIP, SO, SSOP Packages TMS320 family digital signal processors. The MAX192 Pin-Compatible 12-Bit Upgrade (MAX186/MAX188) uses either the internal clock or an external serial- interface clock to perform successive approximation A/D Ordering Information conversions. The serial interface can operate beyond 4MHz when the internal clock is used. The MAX192 has an internal 4.096V reference with a drift of 30ppm typi- PART TEMP. RANGE PIN-PACKAGE INL (LSB) cal. A reference-buffer amplifier simplifies gain trim and MAX192ACPP 0C to +70C 20 Plastic DIP 1/2 two sub-LSBs reduce quantization errors. MAX192BCPP 0C to +70C 20 Plastic DIP 1 The MAX192 provides a hardwired SHDN pin and two MAX192ACWP 0C to +70C 20 Wide SO 1/2 software-selectable power-down modes. Accessing the MAX192BCWP 0C to +70C 20 Wide SO 1 serial interface automatically powers up the device, and MAX192ACAP 0C to +70C 20 SSOP 1/2 the quick turn-on time allows the MAX192 to be shut MAX192BCAP 0C to +70C 20 SSOP 1 down between conversions. By powering down MAX192AEPP -40C to +85C 20 Plastic DIP 1/2 between conversions, supply current can be cut to under 10A at reduced sampling rates. MAX192BEPP -40C to +85C 20 Plastic DIP 1 MAX192AEWP -40C to +85C 20 Wide SO 1/2 The MAX192 is available in 20-pin DIP and SO pack- ages, and in a shrink-small-outline package (SSOP) MAX192BEWP -40C to +85C 20 Wide SO 1 that occupies 30% less area than an 8-pin DIP. The MAX192AEAP -40C to +85C 20 SSOP 1/2 data format provides hardware and software compati- MAX192BEAP -40C to +85C 20 SSOP 1 bility with the MAX186/MAX188. For anti-aliasing filters, MAX192AMJP -55C to +125C 20 CERDIP 1/2 consult the data sheets for the MAX291MAX297. MAX192BMJP -55C to +125C 20 CERDIP 1 Applications Automotive Pin Configuration Pen-Entry Systems TOP VIEW Consumer Electronics CH0 1 V Portable Data Logging 20 DD Robotics 2 CH1 19 SCLK Battery-Powered Instruments, Battery CH2 3 18 CS Management MAX192 CH3 4 17 DIN Medical Instruments CH4 5 16 SSTRB Features CH5 6 15 DOUT CH6 7 14 DGND CH7 8 13 AGND See last page for Typical Operating Circuit. 12 AGND 9 REFADJ SHDN 10 11 VREF SPI and QSPI are trademarks of Motorola Corp. Microwire is a trademark of National Semiconductor Corp. DIP/SO/SSOP Maxim Integrated Products 1 For free samples & the latest literature: Low-Power, 8-Channel, Serial 10-Bit ADC ABSOLUTE MAXIMUM RATINGS V to AGND........................................................... -0.3V to +6V Continuous Power Dissipation (T = +70C) DD A AGND to DGND.................................................... -0.3V to +0.3V Plastic DIP (derate 11.11mW/C above +70C) ......... 889mW CH0CH7 to AGND, DGND ...................... -0.3V to (V + 0.3V) SO (derate 10.00mW/C above +70C)...................... 800mW DD CH0CH7 Total Input Current.......................................... 20mA SSOP (derate 8.00mW/C above +70C) ................... 640mW VREF to AGND .......................................... -0.3V to (V + 0.3V) CERDIP (derate 11.11mW/C above +70C).............. 889mW DD REFADJ to AGND...................................... -0.3V to (V + 0.3V) Operating Temperature Ranges DD Digital Inputs to DGND.............................. -0.3V to (V + 0.3V) MAX192 C P ..................................................... 0C to +70C DD Digital Outputs to DGND........................... -0.3V to (V + 0.3V) MAX192 E P .................................................. -40C to +85C DD Digital Output Sink Current .................................................25mA MAX192 MJP ............................................... -55C to +125C Storage Temperature Range ............................ -60C to +150C Lead Temperature (soldering, 10sec) ............................ +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 = 5V 5%, f = 2.0MHz, external clock (50% duty cycle), 15 clocks/conversion cycle (133ksps), 4.7F capacitor at VREF pin, DD CLK 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 10 Bits MAX192A 1/2 Relative Accuracy (Note 2) LSB MAX192B 1 Differential Nonlinearity DNL No missing codes over temperature 1 LSB Offset Error 2 LSB Gain Error External reference, 4.096V 2 LSB Gain Temperature Coefficient External reference, 4.096V 0.8 ppm/C Channel-to-Channel 0.1 LSB Offset Matching DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock) Signal-to-Noise + Distortion Ratio SINAD 66 dB Total Harmonic Distortion THD -70 dB (up to the 5th harmonic) Spurious-Free Dynamic Range SFDR 70 dB Channel-to-Channel Crosstalk 65kHz, V = 4.096Vp-p (Note 3) -75 dB IN Small-Signal Bandwidth -3dB rolloff 4.5 MHz Full-Power Bandwidth 800 kHz CONVERSION RATE Internal clock 5.5 10 Conversion Time (Note 4) t s CONV External clock, 2MHz, 12 clocks/conversion 6 Track/Hold Acquisition Time t 1.5 s AZ Aperture Delay 10 ns Aperture Jitter <50 ps Internal Clock Frequency 1.7 MHz 2 MAX192