MAX1202BEAP

19-1173; Rev 2; 5/98 KIT ATION EVALU ABLE AVAIL 5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface General Description Features o 8-Channel Single-Ended or 4-Channel Differential Inputs o Operates from Single +5V or Dual ±5V 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 (MAX1202) o SPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar/Bipolar Inputs o 20-Pin DIP/SSOP MAX1202/MAX1203 The MAX1202/MAX1203 are 12-bit data-acquisition systems specifically designed for use in applications with mixed +5V (analog) and +3V (digital) supply voltages. They operate with a single +5V analog supply or dual ±5V analog supplies, and combine an 8-channel multiplexer, high-bandwidth 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 MAX1202/MAX1203 use either the internal clock or an external serial-interface clock to perform successiveapproximation analog-to-digital conversions. The serial interface operates at up to 2MHz. The MAX1202 features an internal 4.096V reference, while the MAX1203 requires an external reference. Both parts have a reference-buffer amplifier that simplifies gain trim. They also have a VL pin that is the power supply for the digital outputs. Output logic levels (3V, 3.3V, or 5V) are determined by the value of the voltage applied to this pin. These devices provide a hard-wired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the devices. A quick turn-on time enables the MAX1202/MAX1203 to be shut down between conversions, allowing the user to optimize supply currents. By customizing powerdown between conversions, supply current can drop below 10µA at reduced sampling rates. The MAX1202/MAX1203 are available in 20-pin SSOP and DIP packages, and are specified for the commercial, extended, and military temperature ranges. Ordering Information PART MAX1202ACPP MAX1202BCPP MAX1202ACAP MAX1202BCAP MAX1202BC/D TEMP. RANGE PIN-PACKAGE 0°C to +70°C 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 Dice* INL (LSB) ±1/2 ±1 ±1/2 ±1 ±1 Ordering Information continued at end of data sheet. *Dice are specified at TA = +25°C, DC parameters only. Pin Configuration TOP VIEW CH0 1 2 3 4 5 6 7 8 9 20 VDD 19 SCLK 18 CS Applications 5V/3V Mixed-Supply Systems Data Acquisition High-Accuracy Process Control Battery-Powered Instruments Medical Instruments Typical Operating Circuit appears at end of data sheet. SPI is a registered trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. CH1 CH2 CH3 CH4 CH5 CH6 CH7 VSS MAX1202 MAX1203 17 DIN 16 SSTRB 15 DOUT 14 VL 13 GND 12 REFADJ 11 REF SHDN 10 DIP/SSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. 5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface MAX1202/MAX1203 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 MAX1202_C_P/MAX1203_C_P ............................0°C to +70°C MAX1202_E_P/MAX1203_E_P..........................-40°C to +85°C MAX1202BMJP/MAX1203BMJP .....................-55°C to +125°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10sec) .............................+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 = +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); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference, VREF = 4.096V applied to REF pin; TA = TMIN to TMAX; unless otherwise noted.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error MAX1202 (all grades) 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 80 -85 4.5 800 70 -80 External reference, 4.096V External reference, 4.096V MAX1203A MAX1203B ±0.8 ±0.1 INL DNL MAX1202A/MAX1203A MAX1202B/MAX1203B No missing codes over temperature 12 ±0.5 ±1.0 ±1.0 ±3.0 ±3 ±1.5 ±3 ppm/°C LSB LSB Bits LSB LSB LSB SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar-input mode) dB dB dB dB MHz kHz 2 _______________________________________________________________________________________ 5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface MAX1202/MAX1203 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); MAX1202—4.7µF capacitor at REF pin; MAX1203—external reference, VREF = 4.096V applied to REF pin; 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 REF Output Voltage REF Short-Circuit Current MAX1202AC VREF Temperature Coefficient Load Regulation (Note 8) Capacitive Bypass at REF Capacitive Bypass at REFADJ REFADJ Adjustment Range EXTERNAL REFERENCE AT REF (Reference 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 MAX1202AE MAX1202B 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 % Unipolar, VSS = 0V Bipolar, VSS = -5V On/off leakage current, VCH_ = ±5V (Note 6) TA = +25°C 4.076 ±0.01 16 4.096 4.116 30 ±50 ±60 ppm/°C VREF ±VREF / 2 ±1 V µA pF V mA 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