EVALUATION KIT AVAILABLE MAX186/MAX188 Low-Power, 8-Channel, Serial 12-Bit ADCs General Description Features 8-Channel Single-Ended or 4-Channel The MAX186/MAX188 are 12-bit data-acquisition sys- Differential Inputs tems that combine an 8-channel multiplexer, high- bandwidth track/hold, and serial interface together with Single +5V or 5V Operation high conversion speed and ultra-low power consump- Low Power: 1.5mA (Operating Mode) tion. The devices operate with a single +5V supply or 2A (Power-Down Mode) dual 5V supplies. The analog inputs are software con- Internal Track/Hold, 133kHz Sampling Rate figurable for unipolar/bipolar and single-ended/differen- Internal 4.096V Reference (MAX186) tial operation. SPI-/QSPI-/MICROWIRE-/TMS320-Compatible The 4-wire serial interface directly connects to SPI, 4-Wire Serial Interface QSPI and MICROWIRE devices without external Software-Configurable Unipolar or Bipolar Inputs logic. A serial strobe output allows direct connection to 20-Pin PDIP, SO, SSOP Packages TMS320 family digital signal processors. The Evaluation Kit Available MAX186/MAX188 use either the internal clock or an external serial-interface clock to perform successive- Ordering Information approximation A/D conversions. The serial interface can PART TEMP RANGE PIN-PACKAGE operate beyond 4MHz when the internal clock is used. MAX186 CPP+ 0C to +70C 20 PDIP The MAX186 has an internal 4.096V reference while the MAX186 CWP+ 0C to +70C 20 SO MAX188 requires an external reference. Both parts have MAX186 CAP+ 0C to +70C 20 SSOP a reference-buffer amplifier that simplifies gain trim . MAX186DC/D 0C to +70C Dice* The MAX186/MAX188 provide a hard-wired SHDN pin MAX186 EPP+ -40C to +85C 20 PDIP and two software-selectable power-down modes. Accessing the serial interface automatically powers up MAX186 EWP+ -40C to +85C 20 SO the devices, and the quick turn-on time allows the MAX186 EAP+ -40C to +85C 20 SSOP MAX186/MAX188 to be shut down between every con- Ordering Information continued on last page. version. Using this technique of powering down Parts are offered in grades A, B, C and D (grades defined in between conversions, supply current can be cut to Electrical Characteristics). When ordering, please specify grade. under 10A at reduced sampling rates. Contact factory for availability of A-grade in SSOP package. *Dice are specified at +25C, DC parameters only. The MAX186/MAX188 are available in 20-pin PDIP and +Denotes a lead(Pb)-free/RoHS-compliant package. SO packages, and in a shrink small-outline package (SSOP), that occupies 30% less area than an 8-pin PDIP. For applications that call for a parallel interface, Pin Configuration see the MAX180/MAX181 data sheet. For anti-aliasing TOP VIEW filters, consult the MAX274/MAX275 data sheet. + CH0 1 V 20 DD Applications CH1 2 19 SCLK Portable Data Logging CS CH2 3 18 Data-Acquisition CH3 4 17 DIN MAX186 High-Accuracy Process Control CH4 5 16 SSTRB MAX188 Automatic Testing 6 CH5 15 DOUT Robotics CH6 7 14 DGND Battery-Powered Instruments CH7 8 13 AGND Medical Instruments V 9 12 REFADJ SS SHDN 10 11 VREF QSPI is a trademark of Motorola. MICROWIRE is a registered trademark of National PDIP/SO/SSOP Semiconductor. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. 19-0123 Rev 5 1/12MAX186/MAX188 Low-Power, 8-Channel, Serial 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0.3V to +6V Continuous Power Dissipation (TA = +70C) DD V to AGND ............................................................+0.3V to -6V PDIP (derate 11.11mW/C above +70C).....................889mW SS V to V ..............................................................-0.3V to +12V SO (derate 10.00mW/C above +70C)........................800mW DD SS AGND to DGND.....................................................-0.3V to +0.3V SSOP (derate 8.00mW/C above +70C) .....................640mW CH0CH7 to AGND, DGND.............(V - 0.3V) to (V + 0.3V) Operating Temperature Ranges SS DD CH0CH7 Total Input Current...........................................20mA MAX186 C/MAX188 C ........................................0C to +70C VREF to AGND ...........................................-0.3V to (V + 0.3V) MAX186 E/MAX188 E......................................-40C to +85C DD REFADJ to AGND.......................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Digital Inputs to DGND...............................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Digital Outputs to DGND............................-0.3V to (V + 0.3V) Soldering Temperature (reflow) .......................................+260C DD Digital Output Sink Current .................................................25mA 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% V = 0V or -5V f = 2.0MHz, external clock (50% duty cycle) 15 clocks/conversion cycle (133ksps) MAX186 DD SS CLK 4.7F capacitor at VREF pin MAX188external reference, VREF = 4.096V applied to VREF pin T = T to T , unless otherwise A MIN MAX noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 12 Bits MAX186A/MAX188A 0.5 MAX186B/MAX188B 0.5 Relative Accuracy (Note 2) MAX186C 1.0 LSB MAX188C 0.75 MAX186D/MAX188D 1.0 Differential Nonlinearity DNL No missing codes over temperature 1 LSB MAX186A/MAX188A 2.0 MAX186B/MAX188B 3.0 Offset Error LSB MAX186C/MAX188C 3.0 MAX186D/MAX188D 3.0 MAX186 (all grades) 3.0 MAX188A 1.5 Gain Error (Note 3) MAX188B 2.0 LSB External reference 4.096V (MAX188) MAX188C 2.0 MAX188D 3.0 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, 4.096V , 133ksps, 2.0MHz external clock, bipolar input mode) P-P Signal-to-Noise + Distortion Ratio SINAD 70 dB Total Harmonic Distortion THD -80 dB (up to the 5th harmonic) Spurious-Free Dynamic Range SFDR 80 dB Channel-to-Channel Crosstalk 65kHz, V = 4.096V (Note 4) -85 dB IN P-P 2 Maxim Integrated