MAX110/MAX111 19-0283 Rev 5 11/98 Low-Cost, 2-Channel, 14-Bit Serial ADCs General Description Features Single +5V Supply (MAX111) The MAX110/MAX111 analog-to-digital converters (ADCs) use an internal auto-calibration technique to Two Differential Input Channels achieve 14-bit resolution plus overrange, with no exter- 14-Bit Resolution Plus Sign and Overrange nal components. Operating supply current is only 0.03% Linearity (MAX110) 550A (MAX110) and reduces to 4A in power-down 0.05% Linearity (MAX111) mode, making these ADCs ideal for high-resolution bat- Low Power Consumption: tery-powered or remote-sensing applications. A fast 550A (MAX110) serial interface simplifies signal routing and opto-isola- 640A (MAX111) tion, saves microcontroller pins, and offers compatibility 4A Shutdown Current with SPI, QSPI, and MICROWIRE. The MAX110 Up to 50 Conversions/sec operates with 5V supplies, and converts differential 50Hz/60Hz Rejection analog signals in the -3V to +3V range. The MAX111 operates with a single +5V supply and converts differ- Auto-Calibration Mode ential analog signals in the 1.5V range, or single- No External Components Required ended signals in the 0V to +1.5V range. 16-Pin DIP/SO, 20-Pin SSOP Internal calibration allows for both offset and gain-error correction under microprocessor (P) control. Both Ordering Information devices are available in space-saving 16-pin DIP and PART TEMP. RANGE PIN-PACKAGE INL(%) SO packages, as well as an even smaller 20-pin SSOP MAX110ACPE 0C to +70C 16 Plastic DIP 0.03 package. MAX110BCPE 0C to +70C 16 Plastic DIP 0.05 Applications MAX110ACWE 0C to +70C 16 Wide SO 0.03 Process Control MAX110BCWE 0C to +70C 16 Wide SO 0.05 MAX110ACAP 0C to +70C 20 SSOP 0.03 Weigh Scales MAX110BCAP 0C to +70C 20 SSOP 0.05 Panel Meters MAX110BC/D 0C to +70C Dice* 0.05 Data-Acquisition Systems Ordering Information continued at end of data sheet. Temperature Measurement * Contact factory for dice specifications. Typical Operating Circuit Pin Configurations +5V TOP VIEW IN1+ 1 16 IN1- V DD IN1+ RCSEL REF- 2 15 IN2+ MAX110 REF+ 3 14 IN2- IN1- MAX110 MAX111 MAX111 V 4 13 V (AGND) IN2+ DD SS IN2- RCSEL 5 12 GND REF+ XCLK 6 11 DIN REF- SCLK 7 10 DOUT CS SCLK BUSY 8 9 CS FROM C DIN V SS DIP/SO DOUT (AGND) ( ) ARE FOR MAX111 ( ) ARE FOR MAX111 -5V (0V) Pin Configurations continued at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 For free samples & the latest literature: Low-Cost, 2-Channel, 14-Bit Serial ADCs ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................................+6V 16-Pin Wide SO (derate 9.52mW/C above +70C) ......762mW DD V to GND (MAX110)..............................................+0.3V to -6V 20-Pin SSOP (derate 8.00mW/C above +70C) ...........640mW SS AGND to DGND.....................................................-0.3V to +0.3V 16-Pin CERDIP (derate 10.00mW/C above +70C)......800mW V , V ......................................(V + 0.3V) to (V - 0.3V) Operating Temperature Ranges IN1+ IN1- DD SS V , V ......................................(V + 0.3V) to (V - 0.3V) MAX11 C ......................................................0C to +70C IN2+ IN2- DD SS V , V ....................................(V + 0.3V) to (V - 0.3V) MAX11 E ...................................................-40C to +85C REF+ REF- DD SS Digital Inputs and Outputs .........................(V + 0.3V) to -0.3V MAX11 BMJE .................................................-55C to +125C DD Continuous Power Dissipation Storage Temperature Range .............................-65C to +160C 16-Pin Plastic DIP (derate 10.53mW/C above +70C).....842mW Lead Temperature (soldering, 10sec) .............................+300C 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 CHARACTERISTICSMAX110 (V = 5V 5%, V = -5V 5%, f = 1MHz, 2 mode (DV2 = 1), 81,920 CLK cycles/conv, V = 1.5V, V = -1.5V, DD SS XCLK REF+ REF- T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) 14 + POL Resolution RES (Note 2) Bits + OFL Differential Nonlinearity DNL (Notes 3, 4) 2 LSB No-Missing-Codes 13 + POL (Note 3) Bits Resolution + OFL -V V V 0.03 0.06 REF IN REF MAX110AC/E -0.83 x V V 0.83 x V 0.015 0.03 REF IN REF -V V V 0.04 Relative Accuracy REF IN REF INL MAX110BC/E %FSR (Notes 3, 57) -0.83 x V V 0.83 x V 0.018 REF IN REF -V V V 0.1 REF IN REF MAX110BM -0.83 x V V 0.83 x V 0.05 REF IN REF Offset Error V = V = 0V 4 mV IN+ IN- After offset null 0.003 Offset Error V/C Temperature Drift Uncalibrated 0.02 Common-Mode Rejection CMRR -2.5V (V = V ) 2.5V 6 ppm/V IN+ IN- Ratio After gain calibration (Note 5) 0.1 Full-Scale Error % Uncalibrated -8 0 Full-Scale Error 8 ppm/C Temperature Drift V = -5V, V = 4.75V to 5.25V 15 SS DD Power-Supply Rejection ppm V = 5V, V = -4.75V to -5.25V 30 DD SS ANALOG INPUTS Differential Input Voltage V (Note 6) -V +V V IN REF REF Range V+V - SS DD Absolute Input Voltage V , IN+ V Range V IN- 2.25 2.25 Input Bias Current I , I 500 nA IN+ IN- Input Capacitance (Note 3) 10 pF 2 MAX110/MAX111