MAX1084/MAX1085 19-1686 Rev 1 12/10 400ksps/300ksps, Single-Supply, Low-Power, Serial 10-Bit ADCs with Internal Reference General Description Features The MAX1084/MAX1085 10-bit analog-to-digital convert- Single-Supply Operation ers (ADCs) combine a high-bandwidth track/hold, a serial +4.5V to +5.5V (MAX1084) interface with high conversion speed, an internal +2.5V +2.7V to +3.6V (MAX1085) reference, and low power consumption. The MAX1084 10-Bit Resolution operates from a single +4.5V to +5.5V supply the MAX1085 operates from a single +2.7V to +3.6V supply. 400ksps Sampling Rate (MAX1084) The 3-wire serial interface connects directly to Internal Track/Hold SPI/QSPI/MICROWIRE devices without external logic. The devices use an external serial-interface clock to Internal +2.5V Reference perform successive-approximation analog-to-digital con- Low Power: 2.5mA (400ksps) versions. SPI/QSPI/MICROWIRE 3-Wire Serial Interface Low power combined with ease of use and small pack- age size make these converters ideal for remote-sensor Pin-Compatible, High-Speed Upgrade to and data-acquisition applications, or for other circuits with MAX1242/MAX1243 demanding power consumption and space requirements. 8-Pin SO Package The MAX1084/MAX1085 are available in 8-pin SO packages. Ordering Information These devices are pin-compatible, higher-speed versions of the MAX1242/MAX1243 for more information, refer to TEMP PIN- INL PART the respective data sheets. RANGE PACKAGE (LSB) MAX1084ACSA+ 0C to +70C 8 SO 1/2 Applications MAX1084BCSA+ 0C to +70C 8 SO 1 Portable Data Logging MAX1084AESA+ -40C to +85C 8 SO 1/2 Data Acquisition MAX1084BESA+ -40C to +85C 8 SO 1 Medical Instruments MAX1085ACSA+ 0C to +70C 8 SO 1/2 Battery-Powered Instruments MAX1085BCSA+ 0C to +70C 8 SO 1 MAX1085AESA+ -40C to +85C 8 SO 1/2 Pen Digitizers MAX1085BESA+ -40C to +85C 8 SO 1 Process Control +Denotes a lead(Pb)-free/RoHS-compliant package. Pin Configuration Functional Diagram V DD 1 TOP VIEW 7 CS 8 SCLK + 3 CONTROL INT SHDN V DD SCLK 1 8 LOGIC CLOCK OUTPUT 6 DOUT AIN SHIFT 2 CS 7 REGISTER MAX1084 SHDN 3 6 DOUT MAX1085 2 10-BIT T/H AIN REF 4 5 GND SAR 2.5V REFERENCE SO MAX1084 MAX1085 4 REF SPI and QSPI are trademarks of Motorola, Inc. 5 GND MICROWIRE is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.400ksps/300ksps, Single-Supply, Low-Power, Serial 10-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0.3V to +6V Operating Temperature Ranges DD AIN to GND................................................-0.3V to (V + 0.3V) MAX1084 CSA/MAX1085 CSA.........................0C to +70C DD REF to GND ...............................................-0.3V to (V + 0.3V) MAX1084 ESA/MAX1085 ESA ......................-40C to +85C DD Digital Inputs to GND...............................................-0.3V to +6V Storage Temperature Range............................-60C to +150C DOUT to GND............................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s)................................+300C DD DOUT Current..................................................................25mA Soldering Temperature (reflow)......................................+260C Continuous Power Dissipation (T = +70C) A 8-Pin SO (derate 5.88mW/C above +70C) ..............471mW 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 CHARACTERISTICSMAX1084 (V = +4.5V to +5.5V, f = 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7F capacitor at REF, T = T to DD SCLK A MIN T , unless otherwise noted. Typical values are at T = +25C.) MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY (Note 1) Resolution 10 Bits MAX1084A 0.5 Relative Accuracy (Note 2) INL LSB MAX1084B 1.0 Differential Nonlinearity DNL No missing codes over temperature 1.0 LSB Offset Error 4.0 LSB Gain Error (Note 3) 3.0 LSB Gain-Error Temperature 0.8 ppm/C Coefficient DYNAMIC SPECIFICATIONS (100kHz sine wave, 2.5V , clock = 6.4MHz) P-P Signal-to-Noise Plus Distortion SINAD 60 dB Ratio Total Harmonic Distortion THD Up to the 5th harmonic -70 dB Spurious-Free Dynamic Range SFDR 70 dB Intermodulation Distortion IMD f = 99kHz, f =102kHz 76 dB IN1 IN2 Full-Power Bandwidth -3dB point 6 MHz Full-Linear Bandwidth SINAD > 58dB 350 kHz CONVERSION RATE Conversion Time (Note 4) t 2.5 s CONV Track/Hold Acquisition Time t 468 ns ACQ Aperture Delay 10 ns Aperture Jitter < 50 ps Serial Clock Frequency f 0.5 6.4 MHz SCLK Duty Cycle 40 60 % ANALOG INPUT (AIN) Input Voltage Range V 0 2.5 V AIN Input Capacitance 18 pF 2 MAX1084/MAX1085