MAX192AEWP

19-0247; Rev. 1; 4/97 Low-Power, 8-Channel, Serial 10-Bit ADC The MAX192 is a low-cost, 10-bit data-acquisition system that combines an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and ultra-low power consumption. The device operates with a single +5V supply. The analog inputs are software configurable for single-ended and differential (unipolar/bipolar) operation. The 4-wire serial interface connects directly to SPI™, QSPI™, and Microwire™ devices, without using external logic. A serial strobe output allows direct connection to TMS320 family digital signal processors. The MAX192 uses either the internal clock or an external serialinterface clock to perform successive approximation A/D 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 typical. A reference-buffer amplifier simplifies gain trim and two sub-LSBs reduce quantization errors. The MAX192 provides a hardwired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the device, and the quick turn-on time allows the MAX192 to be shut down between conversions. By powering down between conversions, supply current can be cut to under 10µA at reduced sampling rates. The MAX192 is available in 20-pin DIP and SO packages, and in a shrink-small-outline package (SSOP) that occupies 30% less area than an 8-pin DIP. The data format provides hardware and software compatibility with the MAX186/MAX188. For anti-aliasing filters, consult the data sheets for the MAX291–MAX297. ♦ 8-Channel Single-Ended or 4-Channel Differential Inputs ♦ Single +5V Operation ♦ Low Power: 1.5mA (operating) 2µA (power-down) ♦ Internal Track/Hold, 133kHz Sampling Rate ♦ Internal 4.096V Reference ♦ 4-Wire Serial Interface is Compatible with SPI, QSPI, Microwire, and TMS320 ♦ 20-Pin DIP, SO, SSOP Packages ♦ Pin-Compatible 12-Bit Upgrade (MAX186/MAX188) _______________Ordering Information PART TEMP. RANGE MAX192ACPP 0°C to +70°C PIN-PACKAGE INL (LSB) 20 Plastic DIP ±1/2 MAX192BCPP MAX192ACWP MAX192BCWP MAX192ACAP MAX192BCAP MAX192AEPP MAX192BEPP MAX192AEWP MAX192BEWP MAX192AEAP MAX192BEAP MAX192AMJP MAX192BMJP 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C -55°C to +125°C 20 Plastic DIP 20 Wide SO 20 Wide SO 20 SSOP 20 SSOP 20 Plastic DIP 20 Plastic DIP 20 Wide SO 20 Wide SO 20 SSOP 20 SSOP 20 CERDIP 20 CERDIP ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ________________________Applications Automotive Pen-Entry Systems Consumer Electronics Portable Data Logging Robotics Battery-Powered Instruments, Battery Management Medical Instruments ____________________________Features See last page for Typical Operating Circuit. SPI and QSPI are trademarks of Motorola Corp. Microwire is a trademark of National Semiconductor Corp. ___________________Pin Configuration TOP VIEW CH0 1 20 VDD CH1 2 19 SCLK 18 CS CH2 3 CH3 4 MAX192 17 DIN CH4 5 16 SSTRB CH5 6 15 DOUT CH6 7 14 DGND CH7 8 13 AGND AGND 9 12 REFADJ SHDN 10 11 VREF DIP/SO/SSOP ________________________________________________________________ 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 408-737-7600 ext. 3468. MAX192 ________________General Description MAX192 Low-Power, 8-Channel, Serial 10-Bit ADC ABSOLUTE MAXIMUM RATINGS VDD to AGND........................................................... -0.3V to +6V AGND to DGND.................................................... -0.3V to +0.3V CH0–CH7 to AGND, DGND ...................... -0.3V to (VDD + 0.3V) CH0–CH7 Total Input Current.......................................... ±20mA VREF to AGND .......................................... -0.3V to (VDD + 0.3V) REFADJ to AGND...................................... -0.3V to (VDD + 0.3V) Digital Inputs to DGND.............................. -0.3V to (VDD + 0.3V) Digital Outputs to DGND ........................... -0.3V to (VDD + 0.3V) Digital Output Sink Current .................................................25mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 11.11mW/°C above +70°C) ......... 889mW SO (derate 10.00mW/°C above +70°C) ...................... 800mW SSOP (derate 8.00mW/°C above +70°C) ................... 640mW CERDIP (derate 11.11mW/°C above +70°C) .............. 889mW Operating Temperature Ranges MAX192_C_P ..................................................... 0°C to +70°C MAX192_E_P .................................................. -40°C to +85°C MAX192_MJP ............................................... -55°C to +125°C Storage Temperature Range ............................ -60°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 = 5V ±5%, fCLK = 2.0MHz, external clock (50% duty cycle), 15 clocks/conversion cycle (133ksps), 4.7µF capacitor at VREF pin, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 10 Relative Accuracy (Note 2) Differential Nonlinearity DNL Bits MAX192A ±1/2 MAX192B ±1 No missing codes over temperature ±1 LSB ±2 LSB Offset Error Gain Error External reference, 4.096V Gain Temperature Coefficient External reference, 4.096V ±2 Channel-to-Channel Offset Matching LSB LSB ±0.8 ppm/°C ±0.1 LSB 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 (up to the 5th harmonic) THD -70 dB Spurious-Free Dynamic Range SFDR 70 dB Channel-to-Channel Crosstalk 65kHz, VIN = 4.096Vp-p (Note 3) -75 dB Small-Signal Bandwidth -3dB rolloff 4.5 MHz 800 kHz Full-Power Bandwidth CONVERSION RATE Conversion Time (Note 4) Track/Hold Acquisition Time tCONV Internal clock External clock, 2MHz, 12 clocks/conversion 5.5 10 6 tAZ 1.5 µs µs Aperture Delay 10 ns Aperture Jitter