MAX1227

19-2851; Rev 1; 7/03 KIT ATION EVALU ABLE AVAIL 12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference Features o Internal Temperature Sensor (±1°C Accuracy) o 16-Entry First-In/First-Out (FIFO) o Analog Multiplexer with True Differential Track/Hold 16-, 12-, 8-Channel Single Ended 8-, 6-, 4-Channel True Differential (Unipolar or Bipolar) o Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing Codes Over Temperature o Scan Mode, Internal Averaging, and Internal Clock o Low-Power Single +3V Operation 0.62mA at 300ksps o Internal 2.5V Reference or External Differential Reference o 10MHz 3-Wire SPI/QSPI/MICROWIRE-Compatible Interface o Space-Saving 28-Pin 5mm x 5mm QFN Package General Description The MAX1227/MAX1229/MAX1231 are serial 12-bit analog-to-digital converters (ADCs) with an internal reference and an internal temperature sensor. These devices feature on-chip FIFO, scan mode, internal clock mode, internal averaging, and AutoShutdown™. The maximum sampling rate is 300ksps using an external clock. The MAX1231 has 16 input channels, the MAX1229 has 12 input channels, and the MAX1227 has 8 input channels. All input channels are configurable for single-ended or differential inputs in unipolar or bipolar mode. All three devices operate from a +3V supply and contain a 10MHz SPI™/QSPI™/MICROWIRE™-compatible serial port. The MAX1231 is available in 28-pin 5mm x 5mm QFN with exposed pad and 24-pin QSOP packages. The MAX1227/MAX1229 are only available in QSOP packages. All three devices are specified over the extended -40°C to +85°C temperature range. MAX1227/MAX1229/MAX1231 ________________________Applications System Supervision Data-Acquisition Systems Industrial Control Systems Patient Monitoring Data Logging Instrumentation AutoShutdown is a trademark of Maxim Integrated Products, Inc. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Ordering Information PART MAX1227ACEE-T* MAX1227AEEE-T* TEMP RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE 16 QSOP 16 QSOP *Future product—contact factory for availability. Ordering Information continued at end of data sheet. Pin Configurations AIN0 1 AIN0 1 AIN1 2 AIN2 3 AIN3 4 AIN4 5 AIN5 6 REF-/AIN6 7 CNVST/AIN7 8 AIN1 2 16 EOC AIN2 3 15 DOUT AIN3 4 14 DIN 17 CS AIN4 5 13 CS AIN5 6 12 SCLK AIN6 7 11 VDD 10 GND 9 REF+ AIN8 9 AIN9 10 12 CNVST/AIN11 11 REF-/AIN10 AIN7 8 15 VDD 14 GND 13 REF+ 18 DIN 20 EOC 19 DOUT TOP VIEW MAX1229 MAX1227 16 SCLK QSOP Pin Configurations continued at end of data sheet. QSOP ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference MAX1227/MAX1229/MAX1231 ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V CS, SCLK, DIN, EOC, DOUT to GND.........-0.3V to (VDD + 0.3V) AIN0–AIN13, REF-/AIN_, CNVST/AIN_, REF+ to GND.........................................-0.3V to (VDD + 0.3V) Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (TA = +70°C) 16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW 20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW 24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW 28-Pin QFN 5mm x 5mm (derate 20.8mW/°C above +70°C) ........................1667mW Operating Temperature Ranges MAX12__C__.......................................................0°C to +70°C MAX12__E__ ....................................................-40°C to +85°C Storage Temperature Range .............................-60°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+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 = +2.7V to +3.6V, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 2.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC ACCURACY (NOTE 1) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error Offset Error Temperature Coefficient Gain Temperature Coefficient Channel-to-Channel Offset Matching DYNAMIC SPECIFICATIONS (10kHz sine wave input, 2.5VP-P, 300ksps, fSCLK = 4.8MHz) Signal-to-Noise Plus Distortion Total Harmonic Distortion Spurious-Free Dynamic Range Intermodulation Distortion Full-Power Bandwidth Full-Linear Bandwidth SINAD THD SFDR IMD fin1 = 9.9kHz, fin2 = 10.2kHz -3dB point S / (N + D) > 68dB Up to the 5th harmonic 70 -82 80 76 1 25 dB dBc dBc dBc MHz kHz (Note 2) RES INL DNL No missing codes over temperature ±0.5 ±0.5 ±2 ±0.8 ±0.1 12 ±1.0 ±1.0 ±4.0 ±4.0 Bits LSB LSB LSB LSB ppm/°C FSR ppm/°C LSB SYMBOL CONDITIONS MIN TYP MAX UNITS 2 _______________________________________________________________________________________ 12-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +3.6V, fSAMPLE = 300kHz, fSCLK = 4.8MHz (50% duty cycle), VREF = 2.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONVERSION RATE Power-Up Time Acquisition Time Conversion Time External Clock Frequency SCLK Duty Cycle Aperture Delay Aperture Jitter ANALOG INPUT Input Voltage Range Input Leakage Current Input Capacitance INTERNAL TEMPERATURE SENSOR Grade A, TA = +25°C Grade A, TA = -20°C to +85°C Measurement Error (Note 7) Grade A, TA = TMIN to TMAX Grade B, TA = +25°C Grade B, TA = TMIN to TMAX Temperature Measurement Noise Temperature Resolution Power-Supply Rejection INTERNAL REFERENCE REF Output Voltage REF Temperature Coefficient Output Resistance REF Output Noise REF Power-Supply Rejection EXTERNAL REFERENCE INPUT REF- Input Voltage Range REF+ Input Voltage Range REF+ Input Current VREFVREF+ IREF+ VREF+ = 2.5V, fSAMPLE = 300ksps VREF+ = 2.5V, fSAMPLE = 0 0 1.0 40 ±0.1 500 VDD + 50mV 100 ±5 mV V µA PSRR TCREF Grade A Grade B 2.48 2.50 ±8 ±30 6.5 200 -70 2.52 V ppm/°C kΩ µVRMS dB ±0.3 ±0.5 ±0.75 ±0.7 ±1.2 0.4 1/8 0.3 ±2.5 °CRMS °C °C/V ±1 ±1.5 °C Unipolar Bipolar (Note 5) VIN = VDD During acquisition time (Note 6) 0 -VREF / 2 ±0.01 24 VREF VREF / 2 ±1 V µA pF tPU tACQ tCONV fSCLK Internally clocked Externally clocked (Note 4) Externally clocked conversion Data I/O 40 30