MAX5820 19-3538 Rev 0 2/05 Dual, 8-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC General Description Features The MAX5820 is a dual, 8-bit voltage-output, digital-to- Ultra-Low Supply Current 2 analog converter (DAC) with an I C-compatible, 115A at V = 3.6V DD 2-wire interface that operates at clock rates up to 400kHz. 135A at V = 5.5V DD The device operates from a single 2.7V to 5.5V supply 300nA Low-Power Power-Down Mode (115A at V = 3.6V). A power-down mode decreases DD Single 2.7V to 5.5V Supply Voltage current consumption to less than 1A. The MAX5820 fea- tures three software-selectable power-down output 2 Fast 400kHz I C-Compatible 2-Wire impedances: 100k, 1k, and high impedance. Other Serial Interface features include internal precision rail-to-rail output Schmitt-Trigger Inputs for Direct Interfacing buffers and a power-on reset (POR) circuit that powers up to Optocouplers the DAC in the 100k power-down mode. 2 Rail-to-Rail Output Buffer Amplifiers The MAX5820 features a double-buffered I C-compatible serial interface that allows multiple devices to share a sin- Three Software-Selectable Power-Down Output gle bus. All logic inputs are CMOS-logic compatible and Impedances buffered with Schmitt triggers, allowing direct interfacing 100k, 1k, and High Impedance to optocoupled and transformer-isolated interfaces. The Readback Mode for Bus and Data Checking MAX5820 minimizes digital noise feedthrough by discon- necting the clock (SCL) signal from the rest of the device Power-On Reset to Zero when an address mismatch is detected. 8-Pin MAX Package The MAX5820 is specified over the extended (-40C to +85C) temperature range and is available in a small Ordering Information 8-pin MAX package. Refer to the MAX5822 data sheet for the 12-bit version and to the MAX5821 data TEMP PIN- PART ADDRESS sheet for a 10-bit version. RANGE PACKAGE MAX5820LEUA -40C to +85C 8 MAX 0111 00X Applications MAX5820MEUA -40C to +85C 8 MAX 1011 00X Digital Gain and Offset Adjustments Programmable Voltage and Current Sources Typical Operating Circuit Programmable Attenuation V VCO/Varactor Diode Control DD Low-Cost Instrumentation V DD C Battery-Operated Instrumentation SDA SCL R P R P Pin Configuration R S TOP VIEW SCL V DD R S MAX5820 OUTA SDA V 1 8 OUTB DD REF OUTB GND 2 7 OUTA MAX5820 R S ADD 3 6 REF V SCL DD R S MAX5820 SDA OUTA SCL 4 5 SDA REF OUTB MAX REF MAX is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Dual, 8-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC ABSOLUTE MAXIMUM RATINGS V , SCL, SDA to GND............................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C DD OUT , REF, ADD to GND..............................-0.3V to V + 0.3V Storage Temperature Range .............................-65C to +150C DD Maximum Current into Any Pin............................................50mA Maximum Junction Temperature .....................................+150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 8-Pin MAX (derate 4.5mW above +70C) ...................362mW 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 = +2.7V to +5.5V, GND = 0, V = V , R = 5k, C = 200pF, T = T to T , unless otherwise noted. Typical values are DD REF DD L L A MIN MAX at V = +5V, T = +25C.) (Note 1) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC ACCURACY (NOTE 2) Resolution N 8 Bits Integral Nonlinearity INL (Note 3) 0.5 1 LSB Differential Nonlinearity DNL Guaranteed monotonic (Note 2) 0.5 LSB Zero-Code Error ZCE Code = 00 hex, V = 2.7V 6 40 mV DD o Zero-Code Error Tempco 2.3 ppm/ C Gain Error GE Code = FF hex -0.8 -3 %FSR o Gain-Error Tempco 0.26 ppm/ C Power-Supply Rejection Ratio PSRR Code = FF hex, V = 4.5V to 5.5V 58.8 dB DD DC Crosstalk 30 V REFERENCE INPUT Reference Input Voltage Range V 0V V REF DD Reference Input Impedance 65 90 k Reference Current Power-down mode 0.3 1 A DAC OUTPUT Output Voltage Range No load (Note 4) 0 V V DD DC Output Impedance Code = 80 hex 1.2 V = 5V, V = full scale (short to GND) 42.2 DD OUT Short-Circuit Current mA V = 3V, V = full scale (short to GND) 15.1 DD OUT V = 5V 8 DD Wake-Up Time s V = 3V 8 DD Power-down mode = high impedance, DAC Output Leakage Current 0.1 1 A V = 5.5V, V = V to GND DD OUT DD DIGITAL INPUTS (SCL, SDA) 0.7 x Input High Voltage V V IH V DD 0.3 x Input Low Voltage V V IL V DD 2 MAX5820