MAX1202/MAX1203 19-1173 Rev 2 5/98 5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface General Description Features The MAX1202/MAX1203 are 12-bit data-acquisition 8-Channel Single-Ended or 4-Channel systems specifically designed for use in applications Differential Inputs with mixed +5V (analog) and +3V (digital) supply volt- Operates from Single +5V or Dual 5V Supplies ages. They operate with a single +5V analog supply or User-Adjustable Output Logic Levels dual 5V analog supplies, and combine an 8-channel (2.7V to 5.25V) multiplexer, high-bandwidth track/hold, and serial inter- face with high conversion speed and low power con- Low Power: 1.5mA (operating mode) sumption. 2A (power-down mode) A 4-wire serial interface connects directly to Internal Track/Hold, 133kHz Sampling Rate SPI/MICROWIRE devices without external logic, Internal 4.096V Reference (MAX1202) and a serial strobe output allows direct connection to SPI/MICROWIRE/TMS320-Compatible TMS320-family digital signal processors. The 4-Wire Serial Interface MAX1202/MAX1203 use either the internal clock or an external serial-interface clock to perform successive- Software-Configurable Unipolar/Bipolar Inputs approximation analog-to-digital conversions. The serial 20-Pin DIP/SSOP interface operates at up to 2MHz. The MAX1202 features an internal 4.096V reference, while the MAX1203 requires an external reference. Both Ordering Information parts have a reference-buffer amplifier that simplifies gain trim. They also have a VL pin that is the power INL PART TEMP. RANGE PIN-PACKAGE (LSB) supply for the digital outputs. Output logic levels (3V, 3.3V, or 5V) are determined by the value of the voltage MAX1202ACPP 0C to +70C 20 Plastic DIP 1/2 applied to this pin. MAX1202BCPP 0C to +70C 20 Plastic DIP 1 These devices provide a hard-wired SHDN pin and two MAX1202ACAP 0C to +70C 20 SSOP 1/2 software-selectable power-down modes. Accessing the MAX1202BCAP 0C to +70C 20 SSOP 1 serial interface automatically powers up the devices. A MAX1202BC/D 0C to +70C Dice* 1 quick turn-on time enables the MAX1202/MAX1203 to Ordering Information continued at end of data sheet. be shut down between conversions, allowing the user *Dice are specified at T = +25C, DC parameters only. A to optimize supply currents. By customizing power- down between conversions, supply current can drop below 10A at reduced sampling rates. Pin Configuration The MAX1202/MAX1203 are available in 20-pin SSOP and DIP packages, and are specified for the commer- cial, extended, and military temperature ranges. TOP VIEW 20 V CH0 1 DD Applications 2 CH1 19 SCLK 5V/3V Mixed-Supply Systems CH2 3 18 CS CH3 4 MAX1202 Data Acquisition 17 DIN MAX1203 CH4 5 16 SSTRB High-Accuracy Process Control CH5 6 15 DOUT Battery-Powered Instruments CH6 7 14 VL Medical Instruments 8 13 GND CH7 V 9 12 REFADJ SS Typical Operating Circuit appears at end of data sheet. SPI is a registered trademark of Motorola, Inc. SHDN 10 11 REF MICROWIRE is a registered trademark of National Semiconductor Corp. DIP/SSOP Maxim Integrated Products 1 For free samples & the latest literature: 5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface ABSOLUTE MAXIMUM RATINGS V to GND ................................................................-0.3V to 6V Continuous Power Dissipation (T = +70C) DD A VL ...............................................................-0.3V to (V + 0.3V) Plastic DIP (derate 11.11mW/C above +70C) ...........889mW DD V to GND.................................................................0.3V to -6V SSOP (derate 8.00mW/C above +70C) .....................640mW SS V to V ................................................................-0.3V to 12V CERDIP (derate 11.11mWC above +70C).................889mW DD SS CH0CH7 to GND............................(V - 0.3V) to (V + 0.3V) Operating Temperature Ranges SS DD CH0CH7 Total Input Current...........................................20mA MAX1202 C P/MAX1203 C P ............................0C to +70C REF to GND................................................-0.3V to (V + 0.3V) MAX1202 E P/MAX1203 E P..........................-40C to +85C DD REFADJ to GND .........................................-0.3V to (V + 0.3V) MAX1202BMJP/MAX1203BMJP.....................-55C to +125C DD Digital Inputs to GND .................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Digital Outputs to GND.................................-0.3V to (VL + 0.3V) Lead Temperature (soldering, 10sec) .............................+300C Digital Output Sink Current .................................................25mA 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%, VL = 2.7V to 3.6V V = 0V or -5V 5% f = 2.0MHz, external clock (50% duty cycle) 15 clocks/conversion DD SS SCLK cycle (133ksps) MAX12024.7F capacitor at REF pin MAX1203external reference, V = 4.096V applied to REF pin REF T = T to T unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 12 Bits MAX1202A/MAX1203A 0.5 Relative Accuracy (Note 2) INL LSB MAX1202B/MAX1203B 1.0 Differential Nonlinearity DNL No missing codes over temperature 1.0 LSB Offset Error 3.0 LSB MAX1202 (all grades) 3 Gain Error (Note 3) MAX1203A 1.5 LSB External reference, 4.096V MAX1203B 3 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, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar-input mode) Signal-to-Noise + Distortion Ratio SINAD 70 dB Total Harmonic Distortion THD -80 dB (up to the 5th harmonic) Spurious-Free Dynamic Range SFDR 80 dB Channel-to-Channel Crosstalk V = 4.096Vp-p, 65kHz (Note 4) -85 dB IN Small-Signal Bandwidth -3dB rolloff 4.5 MHz Full-Power Bandwidth 800 kHz 2 MAX1202/MAX1203