Details, datasheet, quote on part number: MAX147AE
CategoryInterface and Interconnect
Description+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs
CompanyMaxim Integrated Products
DatasheetDownload MAX147AE datasheet
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Features, Applications

o 8-Channel Single-Ended or 4-Channel Differential Inputs o Single-Supply Operation (MAX147) o Internal 2.5V Reference (MAX146) o Low Power (133ksps, 3V supply) (1ksps, 3V supply) 1A (power-down mode) SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar or Bipolar Inputs o 20-Pin DIP/SSOP Packages

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single to +3.6V supply; the MAX147 operates from a single to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation. The 4-wire serial interface connects directly to SPITM/ QSPITM and MICROWIRETM devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a 1.5% voltageadjustment range. These devices provide a hard-wired SHDN pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60A at reduced sampling rates. The MAX146/MAX147 are available in 20-pin DIP and SSOP packages. For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.


Ordering Information continued at end of data sheet. *Dice are specified +25C, DC parameters only.

Portable Data Logging Medical Instruments Pen Digitizers Data Acquisition Battery-Powered Instruments Process Control


SPI and QSPI are registered trademarks of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, or visit Maxim's website at

VDD to AGND, DGND................................................. to 6V AGND to DGND...................................................... 0.3V CH0CH7, COM to AGND, DGND............ -0.3V to (VDD + 0.3V) VREF, REFADJ to AGND........................... -0.3V to (VDD + 0.3V) Digital Inputs to DGND.............................................. to 6V Digital Outputs to DGND........................... -0.3V to (VDD + 0.3V) Digital Output Sink Current.................................................25mA Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 11.11mW/C above +70C)......... 889mW SSOP (derate 8.00mW/C above +70C)................... 640mW CERDIP (derate 11.11mW/C above +70C).............. 889mW Operating Temperature Ranges to +125C Storage Temperature Range............................ to +150C 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.

(VDD +3.6V (MAX146); VDD +5.25V (MAX147); COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX146--4.7F capacitor at VREF pin; MAX147--external reference, VREF 2.500 V applied to VREF pin; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) No Missing Codes Differential Nonlinearity Offset Error Gain Error (Note 3) Gain Temperature Coefficient Channel-to-Channel Offset Matching INL NMC DNL MAX14_B MAX147C Bits LSB ppm/C LSB Bits LSB SYMBOL CONDITIONS MIN TYP MAX UNITS

DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 133ksps, 2.0MHz external clock, bipolar input mode) 70 73 Signal-to-Noise + Distortion Ratio SINAD MAX147C 73 Total Harmonic Distortion Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Small-Signal Bandwidth Full-Power Bandwidth CONVERSION RATE Internal clock, SHDN = FLOAT Conversion Time (Note 5) tCONV Internal clock, SHDN = VDD External clock 2MHz, 12 clocks/conversion s THD SFDR Up to the 5th harmonic 65kHz, 2.500Vp-p (Note 4) -3dB rolloff MAX147C dB MHz

(VDD +3.6V (MAX146); VDD +5.25V (MAX147); COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX146--4.7F capacitor at VREF pin; MAX147--external reference, VREF 2.500 V applied to VREF pin; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER Track/Hold Acquisition Time Aperture Delay Aperture Jitter Internal Clock Frequency External Clock Frequency ANALOG/COM INPUTS Input Voltage Range, SingleEnded and Differential (Note 6) Multiplexer Leakage Current Input Capacitance INTERNAL REFERENCE (MAX146 only, reference buffer enabled) VREF Output Voltage = +25C VREF Short-Circuit Current MAX146_C VREF Temperature Coefficient Load Regulation (Note 7) Capacitive Bypass at VREF Capacitive Bypass at REFADJ Adjustment Range EXTERNAL REFERENCE AT VREF (Buffer disabled) VREF Input Voltage Range (Note 8) VREF Input Current VREF Input Resistance Shutdown VREF Input Current REFADJ Buffer Disable Threshold EXTERNAL REFERENCE AT REFADJ Capacitive Bypass at VREF Reference Buffer Gain REFADJ Input Current Internal compensation mode External compensation mode MAX147 F V/V A VDD 0.5 VREF = 2.5V VDD to 0.2mA output load Internal compensation mode External compensation mode Unipolar, COM = 0V Bipolar, COM = VREF / 2 On/off leakage current, VCH_ 0V or VDD F % ppm/C 0 to VREF V VREF V mA SHDN = FLOAT SHDN = VDD 0.1 Data transfer only 0 SYMBOL tACQ CONDITIONS MIN TYP MAX 1.5 UNITS ns ps MHz


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