_______________General DescriptionThe MAX522 contains two 8-bit, buffered, voltage-outputdigital-to-analog converters (DAC A and DAC B) in small8-pin SO and DIP packages. DAC A’s buffer can sourceand sink 5mA, and DAC B’s output can source and sink500µA, both to within 0.5V of ground and VDD. TheMAX522 operates with a single +2.7V to +5.5V supply.The device utilizes a 3-wire serial interface, which oper-ates at clock rates up to 5MHz and is compatible withSPI™, QSPI™, and Microwire™ interface standards.The serial input shift register is 16 bits long and con-sists of eight bits of DAC input data and eight bits forDAC selection and shutdown control. DAC registerscan be loaded independently or in parallel at the posi-tive edge of CS.The MAX522’s ultra-low power consumption and small8-pin SO package make it ideal for portable and bat-tery-powered applications. Supply current is less than1mA and drops below 1µA in shutdown mode. In addi-tion, the reference input is disconnected from the REFpin during shutdown, further reducing the system’s totalpower consumption. The software format is compatiblewith the MAX512/MAX513 triple 8-bit DACs.________________________ApplicationsDigital Gain and Offset AdjustmentProgrammable Current SourceProgrammable Voltage SourcePower-Amp Bias ControlVCO Tuning____________________________Features♦ Operates from a Single +2.7V to +5.5V Supply♦ Dual Buffered Voltage Output♦ Low Power Consumption:1mA Operating Current <1µA Shutdown Current♦ Independently Programmable Shutdown Mode♦ 5MHz, 3-Wire Serial Interface♦ SPI™, QSPI™, and Microwire™ Compatible♦ Space-Saving 8-Pin SO PackageMAX522Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package________________________________________________________________Maxim Integrated Products1DACLATCHADAC ADACLATCHBDAC BSCLKOUTAOUTBDIN REFVDDCS16-BIT SHIFT REGISTERCONTROL (8) DATA (8)MAX52283156720.1µF0.1µF(OPTIONAL)0.01µFVOUTAVOUTBGND40.22µF________________Functional DiagramOUTBVDDOUTAGND1287DINREFSCLKCSMAX522TOP VIEW3465DIP/SO__________________Pin ConfigurationCall toll free 1-800-998-8800 for free samples or literature.19-0403; Rev 0; 6/95PART TEMP. RANGE PIN-PACKAGEMAX522CPA 0°C to +70°C 8 Plastic DIPMAX522CSA 0°C to +70°C 8 SOMAX522EPA -40°C to +85°C 8 Plastic DIPSPI and QSPI are trademarks of Motorola Inc.Microwire is a trademark of National Semiconductor Corp.______________Ordering InformationMAX522ESA -40°C to +85°C 8 SOMAX522Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VDD= +2.7V to +5.5V, REF = VDD, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)Note 1: The outputs may be shorted to VDDor GND if the package power dissipation is not exceeded. Typical short-circuit current toGND is 50mA.Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.VDDto GND ................................................................ -0.3V, +6VDigital Inputs and Outputs to GND............... -0.3V, (VDD+ 0.3V)REF ................................................................-0.3V, (VDD+ 0.3V)OUTA, OUTB (Note 1)............................................................VDDContinuous Power Dissipation (TA= +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ..............727mWSO (derate 5.88mW/°C above +70°C)...........................471mWOperating Temperature RangesMAX522C_ A.......................................................0°C to +70°CMAX522E_ A....................................................-40°C to +85°CStorage Temperature Range.............................-65°C to +165°CLead Temperature (soldering, 10sec).............................+300°C(Note 3)2.7V ≤ VDD≤ 3.6V, REF = 2.4V 4.5V ≤ VDD≤ 5.5V, REF = 4.096V CONDITIONSMΩ2Reference Input Resistance(shutdown mode)kΩRREFReference Input Resistance 8pF25Reference Input CapacitanceGND VDD%/%0.01PSRRPower-Supply Rejection RatioBits8NResolutionµV/°C100Zero-Code TemperatureCoefficientUNITSMIN TYP MAXSYMBOLPARAMETERGuaranteed monotonic LSB±1DNLDifferential Nonlinearity0.015(Note 2) LSB±1.5INLIntegral Nonlinearity(Note 2) LSB±1TUETotal Unadjusted ErrorReference Input Voltage Range VDAC AµF0.1Capacitive Load at OUT_DAC AΩ50Output ResistanceV0 REFOutput Voltage RangeV(0.7)(VDD)VIHInput High VoltageV(0.3)(VDD)VILInput Low VoltageVIN= 0V or VDDµA0.1 ±10IINInput Current(Notes 4, 5) pF10CINInput CapacitanceDAC BDAC B0.01500STATIC PERFORMANCEREFERENCE INPUTSDAC OUTPUTSDIGITAL INPUTSMAX522Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package_______________________________________________________________________________________ 3Note 2: Reduced digital code range (code 24 through code 232) is due to swing limitations of the output amplifiers. See TypicalOperating Characteristics.Note 3: Reference input resistance is code dependent. The lowest input resistance occurs at code 55hex. Refer to the ReferenceInputsection in the Detailed Description.Note 4: Guaranteed by design. Not production tested.Note 5: Input capacitance is code dependent. The highest capacitance occurs at code 00hex.CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETERELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +5.5V, REF = VDD, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)Voltage-Output Slew Rate SR CL= 0.1µF (DAC A), CL= 0.01µF (DAC B) 0.1 V/µs70Voltage-Output Settling Time To ±1⁄2LSB µsDigital Feedthrough and CrosstalkAll 0s to all 1s 10 nV-sSupply Voltage Range VDD2.7 5.5 VShutdown Supply Current VDD= 5.5V 0.1 µACL= 0.1µF (DAC A)CL= 0.01µF (DAC B) 70Supply Current IDDAll inputs = 0V1.3 2.8mA0.9 2.5DYNAMIC PERFORMANCEPOWER SUPPLIESVDD= 5.5VVDD= 3.6VTIMING CHARACTERISTICS (Note 4)(VDD= +2.7V to +5.5V, TA= TMINto TMAX, unless otherwise noted.)CONDITIONSns200tCSPWH–C—S–Pulse Width Highns100tCLSCLK Pulse Width Lowns100tCHSCLK Pulse Width Highns50tDHDIN to SCLK Rise Hold Timens50tDSDIN to SCLK Rise Setup TimeUNITSMIN TYP MAXSYMBOLPARAMETERns150tCSS–C—S–Fall to
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