MAX1204AEPP

19-1179; Rev 0; 1/97 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface _______________General Description The MAX1204 is a 10-bit data-acquisition system specifically designed for use in applications with mixed +5V (analog) and +3V (digital) supply voltages. It operates with a single +5V analog supply or dual ±5V analog supplies, and combines an 8-channel multiplexer, internal track/hold, and serial interface with high conversion speed and low power consumption. A 4-wire serial interface connects directly to SPI™/Microwire™ devices without external logic, and a serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1204 uses either the internal clock or an external serialinterface clock to perform successive-approximation analog-to-digital conversions. The serial interface operates at up to 2MHz. The MAX1204 features an internal 4.096V reference and a reference-buffer amplifier that simplifies gain trim. It also has a VL pin that supplies power to the digital outputs. Output logic levels (3V, 3.3V, or 5V) are determined by the value of the voltage applied to this pin. A hard-wired SHDN pin and two software-selectable power-down modes are provided. Accessing the serial interface automatically powers up the device. A quick turn-on time allows the MAX1204 to be shut down between conversions, enabling the user to optimize supply currents. By customizing power-down between conversions, supply current can drop below 10µA at reduced sampling rates. The MAX1204 is available in 20-pin SSOP and DIP packages, and is specified for the commercial, extended, and military temperature ranges. ____________________________Features o 8-Channel Single-Ended or 4-Channel Differential Inputs o Operates from +5V Single or ±5V Dual Supplies o User-Adjustable Output Logic Levels (2.7V to 5.25V) o Low Power: 1.5mA (operating mode) 2µA (power-down mode) o Internal Track/Hold, 133kHz Sampling Rate o Internal 4.096V Reference o SPI/Microwire/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar/Bipolar Inputs o 20-Pin DIP/SSOP o Pin-Compatible 12-Bit Upgrade: MAX1202 MAX1204 ______________Ordering Information PART MAX1204ACPP MAX1204BCPP MAX1204ACAP MAX1204BCAP TEMP. RANGE PIN-PACKAGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 20 Plastic DIP 20 Plastic DIP 20 SSOP 20 SSOP INL (LSB) ±1/2 ±1 ±1/2 ±1 Ordering Information continued at end of data sheet. __________________Pin Configuration TOP VIEW CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 VSS 1 2 3 4 5 6 7 8 9 20 VDD 19 SCLK 18 CS ________________________Applications 5V/3V Mixed-Supply Systems Data Acquisition Process Control Battery-Powered Instruments Medical Instruments MAX1204 17 DIN 16 SSTRB 15 DOUT 14 VL 13 GND 12 REFADJ 11 REF Typical Operating Circuit appears on last page. SPI is a registered trademark of Motorola, Inc. Microwire is a registered trademark of National Semiconductor Corp. SHDN 10 DIP/SSOP 1 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface MAX1204 ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V VL ...............................................................-0.3V to (VDD + 0.3V) VSS to GND...............................................................+0.3V to -6V VDD to VSS ..............................................................-0.3V to +12V CH0–CH7 to GND ............................(VSS - 0.3V) to (VDD + 0.3V) CH0–CH7 Total Input Current...........................................±20mA REF to GND ................................................-0.3V to (VDD + 0.3V) REFADJ to GND .........................................-0.3V to (VDD + 0.3V) Digital Inputs to GND .................................-0.3V to (VDD + 0.3V) Digital Outputs to GND .................................-0.3V to (VL + 0.3V) Digital Output Sink Current .................................................25mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 11.11mW/°C above +70°C) ...........889mW SSOP (derate 8.00mW/°C above +70°C) .....................640mW CERDIP (derate 11.11mW°C above +70°C) .................889mW Operating Temperature Ranges MAX1204_C_P .....................................................0°C to +70°C MAX1204_E_P ..................................................-40°C to +85°C MAX1204BMJP ...............................................-55°C to +125°C Storage Temperature Range .............................-60°C to +150°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%, VL = 2.7V to 3.6V; VSS = 0V or -5V ±5%; fSCLK = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); 4.7µF capacitor at REF; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error Gain Error (Note 3) Gain Temperature Coefficient Channel-to-Channel Offset Matching Signal-to-Noise + Distortion Ratio Total Harmonic Distortion (up to the 5th harmonic) Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Small-Signal Bandwidth Full-Power Bandwidth SINAD THD SFDR VIN = 4.096Vp-p, 65kHz (Note 4) -3dB rolloff INL DNL MAX1204A MAX1204B No missing codes over temperature MAX1204A MAX1204B MAX1204A MAX1204B External reference, 4.096V ±0.8 ±0.1 10 ±0.5 ±1.0 ±1.0 ±1.0 ±2.0 ±1.0 ±2.0 Bits LSB LSB LSB LSB ppm/°C LSB SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar input mode) 66 -70 70 -75 4.5 800 dB dB dB dB MHz kHz 2 _______________________________________________________________________________________ 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface MAX1204 ELECTRICAL CHARACTERISTICS (continued) (VDD = +5V ±5%, VL = 2.7V to 3.6V; VSS = 0V or -5V ±5%; fSCLK = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); 4.7µF capacitor at REF; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER CONVERSION RATE Conversion Time (Note 5) Track/Hold Acquisition Time Aperture Delay Aperture Jitter Internal Clock Frequency External compensation mode, 4.7µF External Clock-Frequency Range ANALOG INPUT Input Voltage Range, SingleEnded and Differential (Note 7) Multiplexer Leakage Current Input Capacitance INTERNAL REFERENCE REF Output Voltage REF Short-Circuit Current MAX1204AC VREF Temperature Coefficient Load Regulation (Note 8) Capacitive Bypass at REF Capacitive Bypass at REFADJ REFADJ Adjustment Range EXTERNAL REFERENCE AT REF (Buffer disabled, VREF = 4.096V) Input Voltage Range Input Current Input Resistance REF Input Current in Shutdown REFADJ Buffer Disable Threshold SHDN = 0V VDD 50mV 12 2.50 200 20 1.5 10 VDD + 50mV 350 V µA kΩ µA V MAX1204AE MAX1204B 0mA to 0.5mA output load Internal compensation mode External compensation mode 0 4.7 0.01 ±1.5 ±30 ±30 ±30 2.5 mV µF µF % TA = +25°C 4.076 4.096 4.116 30 ±50 ±60 ppm/°C V mA Unipolar, VSS = 0V Bipolar, VSS = -5V On/off leakage current, VCH_ = ±5V (Note 6) ±0.01 16 VREF ±VREF / 2 ±1 V µA pF Internal compensation mode (Note 6) Used for data transfer only 0.1 0.1 0 tCONV tACQ Internal clock External clock, 2MHz, 12 clocks/conversion 5.5 6 1.5 10