MAX186AEAP

EVALUATION KIT AVAILABLE MAX186/MAX188 Low-Power, 8-Channel, Serial 12-Bit ADCs General Description The MAX186/MAX188 are 12-bit data-acquisition systems that combine an 8-channel multiplexer, highbandwidth track/hold, and serial interface together with high conversion speed and ultra-low power consumption. The devices operate with a single +5V supply or dual ±5V supplies. The analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation. The 4-wire serial interface directly connects to SPI, QSPI™ and MICROWIRE® devices without external logic. A serial strobe output allows direct connection to TMS320 family digital signal processors. The MAX186/MAX188 use either the internal clock or an external serial-interface clock to perform successiveapproximation A/D conversions. The serial interface can operate beyond 4MHz when the internal clock is used. ____________________________Features o 8-Channel Single-Ended or 4-Channel Differential Inputs o Single +5V or ±5V Operation o Low Power: 1.5mA (Operating Mode) 2µA (Power-Down Mode) o Internal Track/Hold, 133kHz Sampling Rate o Internal 4.096V Reference (MAX186) o SPI-/QSPI-/MICROWIRE-/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar or Bipolar Inputs o 20-Pin PDIP, SO, SSOP Packages o Evaluation Kit Available Ordering Information † PART TEMP RANGE PIN-PACKAGE The MAX186 has an internal 4.096V reference while the MAX188 requires an external reference. Both parts have a reference-buffer amplifier that simplifies gain trim . MAX186_CPP+ 0°C to +70°C 20 PDIP MAX186_CWP+ 0°C to +70°C 20 SO MAX186_CAP+ 0°C to +70°C 20 SSOP The MAX186/MAX188 provide a hard-wired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the devices, and the quick turn-on time allows the MAX186/MAX188 to be shut down between every conversion. Using this technique of powering down between conversions, supply current can be cut to under 10µA at reduced sampling rates. MAX186DC/D 0°C to +70°C Dice* MAX186_EPP+ -40°C to +85°C 20 PDIP MAX186_EWP+ -40°C to +85°C 20 SO MAX186_EAP+ -40°C to +85°C 20 SSOP The MAX186/MAX188 are available in 20-pin PDIP and 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, see the MAX180/MAX181 data sheet. For anti-aliasing filters, consult the MAX274/MAX275 data sheet. ________________________Applications Portable Data Logging Data-Acquisition High-Accuracy Process Control Automatic Testing Robotics Battery-Powered Instruments Medical Instruments QSPI is a trademark of Motorola. MICROWIRE is a registered trademark of National Semiconductor. Ordering Information continued on last page. †Parts are offered in grades A, B, C and D (grades defined in Electrical Characteristics). When ordering, please specify grade. Contact factory for availability of A-grade in SSOP package. *Dice are specified at +25°C, DC parameters only. +Denotes a lead(Pb)-free/RoHS-compliant package. ____________________Pin Configuration TOP VIEW + CH0 1 20 VDD CH1 2 19 SCLK CH2 3 18 CS CH3 4 CH4 5 MAX186 MAX188 17 DIN 16 SSTRB CH5 6 15 DOUT CH6 7 14 DGND CH7 8 13 AGND VSS 9 12 REFADJ 11 VREF SHDN 10 PDIP/SO/SSOP For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. 19-0123; Rev 5; 1/12 MAX186/MAX188 Low-Power, 8-Channel, Serial 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS VDD to AGND............................................................-0.3V to +6V VSS to AGND ............................................................+0.3V to -6V VDD to VSS ..............................................................-0.3V to +12V AGND to DGND.....................................................-0.3V to +0.3V CH0–CH7 to AGND, DGND .............(VSS - 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) PDIP (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 Operating Temperature Ranges MAX186_C/MAX188_C ........................................0°C to +70°C MAX186_E/MAX188_E......................................-40°C to +85°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°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%; VSS = 0V or -5V; fCLK = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX186— 4.7µF capacitor at VREF pin; MAX188—external reference, VREF = 4.096V applied to VREF pin; TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 12 Relative Accuracy (Note 2) Differential Nonlinearity DNL Offset Error Bits MAX186A/MAX188A ±0.5 MAX186B/MAX188B ±0.5 MAX186C ±1.0 MAX188C ±0.75 MAX186D/MAX188D ±1.0 No missing codes over temperature ±1 MAX186A/MAX188A ±2.0 MAX186B/MAX188B ±3.0 MAX186C/MAX188C ±3.0 MAX186D/MAX188D ±3.0 MAX186 (all grades) Gain Error (Note 3) External reference 4.096V (MAX188) Gain Temperature Coefficient LSB LSB LSB ±3.0 MAX188A ±1.5 MAX188B ±2.0 MAX188C ±2.0 MAX188D ±3.0 External reference, 4.096V Channel-to-Channel Offset Matching LSB ±0.8 ppm/°C ±0.1 LSB DYNAMIC SPECIFICATIONS (10kHz sine wave input, 4.096VP-P, 133ksps, 2.0MHz external clock, bipolar input mode) Signal-to-Noise + Distortion Ratio Total Harmonic Distortion (up to the 5th harmonic) THD Spurious-Free Dynamic Range SFDR Channel-to-Channel Crosstalk 2 SINAD 70 dB -80 80 65kHz, VIN = 4.096VP-P (Note 4) dB dB -85 dB Maxim Integrated MAX186/MAX188 Low-Power, 8-Channel, Serial 12-Bit ADCs ELECTRICAL CHARACTERISTICS (continued) (VDD = 5V ±5%; VSS = 0V or -5V; fCLK = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX186— 4.7µF capacitor at VREF pin; MAX188—external reference, VREF = 4.096V applied to VREF pin; TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL Small-Signal Bandwidth CONDITIONS MIN -3dB rolloff Full-Power Bandwidth TYP MAX UNITS 4.5 MHz 800 kHz CONVERSION RATE Conversion Time (Note 5) Track/Hold Acquisition Time t CONV Internal clock External clock, 2MHz, 12 clocks/conversion 5.5 10 6 tAZ 1.5 µs µs Aperture Delay 10 ns Aperture Jitter