MAX1204 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface General Description Features The MAX1204 is a 10-bit data-acquisition system 8-Channel Single-Ended or 4-Channel Differential Inputs specifically designed for use in applications with mixed +5V (analog) and +3V (digital) supply voltages. It oper- Operates from +5V Single or 5V Dual Supplies ates with a single +5V analog supply or dual 5V ana- User-Adjustable Output Logic Levels (2.7V to log supplies, and combines an 8-channel multiplexer, 5.25V) internal track/hold, and serial interface with high con- Low Power: 1.5mA (Operating Mode) version speed and low power consumption. 2A (Power-Down Mode) A 4-wire serial interface connects directly to Internal Track/Hold, 133kHz Sampling Rate SPI/MICROWIRE devices without external logic, and a Internal 4.096V Reference serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1204 SPI/MICROWIRE/TMS320-Compatible 4-Wire uses either the internal clock or an external serial-inter- Serial Interface face clock to perform successive-approximation ana- Software-Configurable Unipolar/Bipolar Inputs log-to-digital conversions. The serial interface operates 20-Pin PDIP/SSOP at up to 2MHz. Pin-Compatible 12-Bit Upgrade: MAX1202 The MAX1204 features an internal 4.096V reference and a reference-buffer amplifier that simplifies gain trim. It also has a V pin that supplies power to the digital out- L puts. Output logic levels (3V, 3.3V, or 5V) are determined Ordering Information by the value of the voltage applied to this pin. TO P PIN- A hard-wired SHDN pin and two software-selectable PART TEMP RANGE PACKAGE M ARK power-down modes are provided. Accessing the serial interface automatically powers up the device. A quick MAX1204ACPP+ 0C to +70C 20 PDIP 1/2 turn-on time allows the MAX1204 to be shut down MAX1204BCPP+ 0C to +70C 20 PDIP 1 between conversions, enabling the user to optimize MAX1204ACAP+ 0C to +70C 20 SSOP 1/2 supply currents. By customizing power-down between MAX1204BCAP+ 0C to +70C 20 SSOP 1 conversions, supply current can drop below 10A at reduced sampling rates. Ordering Information continued at end of data sheet. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX1204 is available in 20-pin SSOP and PDIP packages, and is specified for the commercial and extended temperature ranges. Pin Configuration Applications 5V/3V Mixed-Supply Systems TOP VIEW + Data Acquisition CH0 1 20 V DD Process Control CH1 2 19 SCLK Battery-Powered Instruments CS CH2 3 18 Medical Instruments CH3 4 MAX1204 17 DIN CH4 5 16 SSTRB CH5 6 DOUT 15 CH6 7 14 V L CH7 8 13 GND V 9 12 SS REFADJ SHDN 10 11 REF Typical Operating Circuit appears on last page. PDIP/SSOP MICROWIRE is a registered trademark of National Semiconductor Corp. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-1179 Rev 1 1/12MAX1204 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Digital Output Sink Current .................................................25mA DD V ................................................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) L DD A V to GND...............................................................+0.3V to -6V PDIP (derate 11.11mW/C above +70C).....................889mW SS V to V ..............................................................-0.3V to +12V SSOP (derate 8.00mW/C above +70C) .....................640mW DD SS CH0CH7 to GND............................(V - 0.3V) to (V + 0.3V) Operating Temperature Ranges SS DD CH0CH7 Total Input Current...........................................20mA MAX1204 C P .....................................................0C to +70C REF to GND................................................-0.3V to (V + 0.3V) MAX1204 E P ..................................................-40C to +85C DD REFADJ to GND .........................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Digital Inputs to GND .................................-0.3V to (V + 0.3V) Soldering Temperature (reflow) .......................................+260C DD Digital Outputs to GND .................................-0.3V to (V + 0.3V) L 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 = 2.7V to 3.6V V = 0V or -5V 5% f = 2.0MHz, external clock (50% duty cycle) 15 clocks/conversion DD L SS SCLK cycle (133ksps) 4.7F capacitor at REF T = T to T unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 10 Bits MAX1204A 0.5 Relative Accuracy (Note 2) INL LSB MAX1204B 1.0 Differential Nonlinearity DNL No missing codes over temperature 1.0 LSB MAX1204A 1.0 Offset Error LSB MAX1204B 2.0 MAX1204A 1.0 Gain Error (Note 3) LSB MAX1204B 2.0 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 66 dB Total Harmonic Distortion THD -70 dB (up to the 5th harmonic) Spurious-Free Dynamic Range SFDR 70 dB Channel-to-Channel Crosstalk V = 4.096 , 65kHz (Note 4) -75 dB IN V P-P Small-Signal Bandwidth -3dB rolloff 4.5 MHz Full-Power Bandwidth 800 kHz Maxim Integrated 2