MAX1080BCUP+

19-1685; Rev 0; 5/00 300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference The 4-wire serial interface connects directly to SPI™/QSPI™ and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1080/ MAX1081 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The devices feature an internal +2.5V reference and a reference-buffer amplifier with a ±1.5% voltage-adjustment range. An external reference with a 1V to VDD1 range may also be used. The MAX1080/MAX1081 provide a hard-wired SHDN pin and four software-selectable power modes (normal operation, reduced power (REDP), fast power-down (FASTPD), and full power-down (FULLPD)). These devices can be programmed to automatically shut down at the end of a conversion or to operate with reduced power. When using the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turnon time allows them to be shut down between all conversions. This technique can cut supply current below 100mA at lower sampling rates. The MAX1080/MAX1081 are available in a 20-pin TSSOP package. These devices are higher-speed versions of the MAX148/MAX149. For more information, refer to the respective data sheet. Applications Portable Data Logging Data Acquisition Medical Instruments Battery-Powered Instruments Features ♦ 8-Channel Single-Ended or 4-Channel Pseudo-Differential Inputs ♦ Internal Multiplexer and Track/Hold ♦ Single-Supply Operation +4.5V to +5.5V (MAX1080) +2.7V to +3.6V (MAX1081) ♦ Internal +2.5V Reference ♦ 400ksps Sampling Rate (MAX1080) ♦ Low Power: 2.5mA (400ksps) 1.3mA (REDP) 0.9mA (FASTPD) 2µA (FULLPD) ♦ SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface ♦ Software-Configurable Unipolar or Bipolar Inputs ♦ 20-Pin TSSOP Package Ordering Information PART TEMP. RANGE PINPACKAGE INL (LSB) MAX1080ACUP 0°C to +70°C 20 TSSOP ±1/2 MAX1080BCUP MAX1080AEUP 0°C to +70°C -40°C to +85°C 20 TSSOP 20 TSSOP ±1 ±1/2 Ordering Information continued at end of data sheet. Pin Configuration TOP VIEW CH0 1 20 VDD1 CH1 2 19 VDD2 18 SCLK CH2 3 CH3 4 CH4 5 MAX1080 MAX1081 17 CS 16 DIN Pen Digitizers CH5 6 15 SSTRB Process Control CH6 7 14 DOUT CH7 8 13 GND COM 9 12 REFADJ Typical Operating Circuit appears at end of data sheet. 11 REF SHDN 10 SPI and QSPI are trademarks of Motorola, Inc. TSSOP MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX1080/MAX1081 General Description The MAX1080/MAX1081 10-bit analog-to-digital converters (ADCs) combine an 8-channel analog-input multiplexer, high-bandwidth track/hold (T/H), and serial interface with high conversion speed and low power consumption. The MAX1080 operates from a single +4.5V to +5.5V supply; the MAX1081 operates from a single +2.7V to +3.6V supply. Both devices’ analog inputs are software configurable for unipolar/bipolar and single-ended/pseudo-differential operation. MAX1080/MAX1081 300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS VDD_ to GND .............................................................. -0.3V to 6V VDD1 to VDD2 ......................................................... -0.3V to 0.3V CH0–CH7, COM to GND.......................... -0.3V to (VDD1 + 0.3V) REF, REFADJ to GND .............................. -0.3V to (VDD1 + 0.3V) Digital Inputs to GND................................................. -0.3V to 6V Digital Outputs to GND ............................ -0.3V to (VDD2 + 0.3V) Digital Output Sink Current .................................................25mA Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP (derate 7.0mW/°C above +70°C) ........ 559mW Operating Temperature Ranges MAX108_ _CUP ................................................. 0°C to +70°C MAX108_ _EUP............................................... -40°C to +85°C Storage Temperature Range ............................ -60°C to +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—MAX1080 (VDD1 = VDD2 = +4.5V to +5.5V, COM = GND, fSCLK = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) 10 Resolution Relative Accuracy (Note 2) INL Differential Nonlinearity DNL Bits MAX1080A ±0.5 MAX1080B ±1.0 No missing codes over temperature LSB ±1.0 LSB Offset Error ±3.0 LSB Gain Error (Note 3) ±3.0 LSB Gain-Error Temperature Coefficient ±0.8 ppm/°C Channel-to-Channel Offset-Error Matching ±0.1 LSB DYNAMIC SPECIFICATIONS (100kHz sine-wave input, 2.5Vp-p, 400ksps, 6.4MHz clock, bipolar input mode) Signal-to-Noise plus Distortion Ratio SINAD Total Harmonic Distortion THD Spurious-Free Dynamic Range SFDR Up to the 5th harmonic 60 dB -70 dB 70 dB fIN1 = 99kHz, fIN2 =102kHz 76 dB Channel-to-Channel Crosstalk (Note 4) fIN = 200kHz, VIN = 2.5Vp-p -78 dB Full-Power Bandwidth -3dB point 6 MHz Full-Linear Bandwidth SINAD > 58dB 350 kHz Intermodulation Distortion IMD CONVERSION RATE Conversion Time (Note 5) tCONV Track/Hold Acquisition Time tACQ 2.5 10 Aperture Delay Duty Cycle 2 fSCLK ns ns 58dB 250 kHz SINAD Total Harmonic Distortion THD Spurious-Free Dynamic Range SFDR Intermodulation Distortion 4 IMD Up to the 5th harmonic _______________________________________________________________________________________ 300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference (VDD1 = VDD2 = +2.7V to +3.6V, COM = GND, fSCLK = 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), external +2.5V at REF, REFADJ = VDD1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CONVERSION RATE Conversion Time (Note 5) tCONV Normal operating mode Track/Hold Acquisition Time tACQ Normal operating mode 3.3 µs 625 Aperture Delay 10 Aperture Jitter