MAX522 19-0403 Rev 0 6/95 Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package General Description Features The MAX522 contains two 8-bit, buffered, voltage-output Operates from a Single +2.7V to +5.5V Supply digital-to-analog converters (DAC A and DAC B) in small Dual Buffered Voltage Output 8-pin SO and DIP packages. DAC As buffer can source Low Power Consumption: and sink 5mA, and DAC Bs output can source and sink 500A, both to within 0.5V of ground and V . The 1mA Operating Current DD MAX522 operates with a single +2.7V to +5.5V supply. <1A Shutdown Current The device utilizes a 3-wire serial interface, which oper- Independently Programmable Shutdown Mode ates at clock rates up to 5MHz and is compatible with 5MHz, 3-Wire Serial Interface SPI, QSPI, and Microwire interface standards. SPI, QSPI, and Microwire Compatible The serial input shift register is 16 bits long and con- sists of eight bits of DAC input data and eight bits for Space-Saving 8-Pin SO Package DAC selection and shutdown control. DAC registers can be loaded independently or in parallel at the posi- tive edge of CS. Ordering Information The MAX522s ultra-low power consumption and small 8-pin SO package make it ideal for portable and bat- PART TEMP. RANGE PIN-PACKAGE tery-powered applications. Supply current is less than MAX522CPA 0C to +70C 8 Plastic DIP 1mA and drops below 1A in shutdown mode. In addi- MAX522CSA 0C to +70C 8 SO tion, the reference input is disconnected from the REF MAX522EPA -40C to +85C 8 Plastic DIP pin during shutdown, further reducing the systems total MAX522ESA -40C to +85C 8 SO power consumption. The software format is compatible with the MAX512/MAX513 triple 8-bit DACs. Applications Functional Diagram Digital Gain and Offset Adjustment Programmable Current Source Programmable Voltage Source 0.22F 0.1F Power-Amp Bias Control (OPTIONAL) V 83DIN DD7 REF VCO Tuning SCLK 2 OUTA V OUTA Pin Configuration DAC 5 0.1F DAC A LATCH A TOP VIEW OUTB V OUTB DAC 6 0.01F DAC B LATCH B 1 8 CS DIN CS 2 MAX522 7 1 SCLK REF MAX522 3 6 V OUTB DD 4 5 GND OUTA 4 GND DIP/SO SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. 16-BIT SHIFT REGISTER CONTROL (8) DATA (8)Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package ABSOLUTE MAXIMUM RATINGS V to GND ................................................................ -0.3V, +6V Operating Temperature Ranges DD Digital Inputs and Outputs to GND............... -0.3V, (V + 0.3V) MAX522C A.......................................................0C to +70C DD REF ................................................................-0.3V, (V + 0.3V) MAX522E A....................................................-40C to +85C DD OUTA, OUTB (Note 1)............................................................V Storage Temperature Range .............................-65C to +165C DD Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10sec) .............................+300C A Plastic DIP (derate 9.09mW/C above +70C) ..............727mW SO (derate 5.88mW/C above +70C)...........................471mW Note 1: The outputs may be shorted to V or GND if the package power dissipation is not exceeded. Typical short-circuit current to DD GND is 50mA. 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, REF = V , T = T to T , unless otherwise noted. Typical values are at T = +25C.) DD DD A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC PERFORMANCE Resolution N 8 Bits Differential Nonlinearity DNL Guaranteed monotonic 1 LSB Integral Nonlinearity INL (Note 2) 1.5 LSB Total Unadjusted Error TUE (Note 2) 1 LSB Zero-Code Temperature 100 V/C Coefficient 4.5V V 5.5V, REF = 4.096V 0.01 DD Power-Supply Rejection Ratio PSRR %/% 2.7V V 3.6V, REF = 2.4V 0.015 DD REFERENCE INPUTS Reference Input Voltage Range GND V V DD Reference Input Capacitance 25 pF R Reference Input Resistance (Note 3) 8 k REF Reference Input Resistance 2 M (shutdown mode) DAC OUTPUTS Output Voltage Range 0 REF V DAC A 0.1 Capacitive Load at OUT F DAC B 0.01 DAC A 50 Output Resistance DAC B 500 DIGITAL INPUTS V Input High Voltage (0.7)(V ) V IH DD V Input Low Voltage (0.3)(V ) V IL DD Input Current I V = 0V or V 0.1 10 A IN IN DD C Input Capacitance (Notes 4, 5) 10 pF IN 2 MAX522