General DescriptionThe MAX6325/MAX6341/MAX6350 are low-noise, preci-sion voltage references with extremely low, 0.5ppm/°Ctypical temperature coefficients and excellent, ±0.02%initial accuracy. These devices feature buried-zenertechnology for lowest noise performance. Load-regula-tion specifications are guaranteed for source and sinkcurrents up to 15mA. Excellent line and load regulationand low output impedance at high frequencies makethem ideal for high-resolution data-conversion systemsup to 16 bits.The MAX6325 is set for a 2.5V output, the MAX6341 isset for a 4.096V output, and the MAX6350 is set for a5V output. All three provide for the option of externaltrimming and noise reduction.________________________ApplicationsHigh-Resolution Analog-to-Digital and Digital-to-Analog ConvertersHigh-Accuracy Reference StandardHigh-Accuracy Industrial and Process ControlDigital VoltmetersATE EquipmentPrecision Current Sources____________________________Features♦ Ultra Low, 1ppm/°C Max Tempco♦ Very Low, 1.5µVp-p Noise (0.1Hz to 10Hz) (MAX6325)♦ ±0.02% Initial Accuracy (MAX6350)♦ ±15mA Output Source and Sink Current♦ Low, 18mW Power Consumption (MAX6325)♦ Industry-Standard Pinout♦ Optional Noise Reduction and Voltage Trim♦ Excellent Transient Response♦ 8-Pin SO Package Available♦ Low, 30ppm/1000hr Long-Term Stability♦ Stable for All Capacitive LoadsMAX6325/MAX6341/MAX63501ppm/°C, Low-Noise, +2.5V/+4.096V/+5VVoltage References________________________________________________________________ Maxim Integrated Products 1REFERENCE OUTGNDNR*OPTIONALTRIMOUTIN8V TO 36V INPUT*2.2µF*2.2µFMAX6325MAX6341MAX6350Typical Operating CircuitOUTNRTRIMGND1287I.C.I.C.INI.C.MAX6325MAX6341MAX6350DIP/SOTOP VIEWI.C. = INTERNALLY CONNECTED; DO NOT USE3465Pin Configuration19-1203; Rev 1; 1/01Ordering InformationOrdering Information continued at end of data sheet.MAX6325CPAMAX6325CSA 0°C to +70°C0°C to +70°C 1.01.08 Plastic DIP8 SOMAX6325EPA -40°C to +85°C 1.58 Plastic DIPPART TEMP. RANGEMAXTEMPCO(ppm/°C)PIN-PACKAGEMAX6325ESA -40°C to +85°C 1.58 SOMAX6325MJA -55°C to +125°C 2.58 CERDIPFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.MAX6325/MAX6341/MAX63501ppm/°C, Low-Noise, +2.5V/+4.096V/+5VVoltage References2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS—MAX6325(VIN= +10V, IOUT= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)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.(Voltages Referenced to GND)IN ................................................................................-0.3V to 40VOUT, TRIM..................................................................-0.3V to 12VNR.................................................................................-0.3V to 6VOUT Short-Circuit to GND Duration (VIN≤ 12V)..........ContinuousOUT Short-Circuit to GND Duration (VIN≤ 40V) ........................5sOUT Short-Circuit to IN Duration (VIN≤ 12V) ..............ContinuousContinuous Power Dissipation (TA= +70°C)8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ......727mW8-Pin SO (derate 5.88mW/°C above +70°C)...................471mW8-Pin CERDIP (derate 8.00mW/°C above +70°C)...........640mWOperating Temperature RangesMAX63_ _ C_ A.......................................................0°C to +70°CMAX63_ _ E_ A....................................................-40°C to +85°CMAX63_ _ MJA ..................................................-55°C to +125°CStorage Temperature Range ..............................-65°C to +150°CLead Temperature (soldering, 10s)...................................+300°CLoad Regulation (Note 2)∆VOUT/∆IOUTppm/mA+25°C+25°Cµs5+25°CtONTurn-On Settling Time To ±0.01% of final valueµVRMS1.3 2.8+25°CenOutput Noise Voltage (Note 3)µVp-p1.5mV±15 ±25C, E, M∆VOUTTrim-Adjustment RangemA3.0C, E, MIINSupply Current1.8 2.7+25°C10 30M1710Hz ≤ f ≤ 1kHzE0.1Hz ≤ f ≤ 10Hz(Figure 1)16Cppm/1000hr315M30+25°C17∆VOUT/tLong-Term StabilityE16C+25°CTemperature Hysteresis ppm20(Note 4)10M8E7C25+25°C10V ≤ VIN≤ 36V45M35E30CMAX6325MJA 1.0 2.5M8V ≤ VIN≤ 10VCONDITIONSMAX6325E_AMAX6325C_AMAX6325ppm/V 10 18+25°C∆VOUT/∆VINLine Regulation (Note 2)ppm/°C0.75 1.5ETCVOUTOutput Voltage TemperatureCoefficient (Note 1)0.5 1.0COutput Voltage VOUT2.499 2.500 2.501 VTAC, E, MPARAMETER SYMBOL MIN TYP MAX UNITSInput Voltage Range VIN836VSourcing: 0mA ≤ IOUT≤ 15mASinking: -15mA ≤ IOUT≤ 0mAMAX6325/MAX6341/MAX63501ppm/°C, Low-Noise, +2.5V/+4.096V/+5VVoltage References_______________________________________________________________________________________ 3(Note 4)V4.095 4.096 4.097VOUTOutput Voltage +25°C20 ppmTemperature HysteresisC 0.5 1.0MAX6341Output Voltage TemperatureCoefficient (Note 1)TCVOUTE 0.75 1.5ppm/°C+25°C+25°C 10 18MAX6341C_AMAX6341E_ACONDITIONS30ppm/1000hr8V ≤ VIN≤ 10VLong-Term Stability ∆VOUT/t +25°CLine Regulation (Note 2)∆VOUT/∆VINppm/V(Figure 1)0.1Hz ≤ f ≤ 10Hz10Hz ≤ f ≤ 1kHzV836VINInput Voltage Range+25°C 1.9 2.9IINC, E, M 3.2mATrim-Adjustment RangeUNITSMIN TYP MAXSYMBOLPARAMETER∆VOUTC, E, M ±24 ±40 mV2.4 µVp-pOutput Noise Voltage (Note 3) en+25°C2.0 4.0 µVRMSC, E, MTAELECTRICAL CHARACTERISTICS—MAX6341(VIN= +10V, IOUT= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)M 1.0 2.5MAX6341MJATo ±0.01% of final valueTurn-On Settling Time tON+25°C 8 µsC 30E 35M 45+25°C 2510V ≤ VIN≤ 36VC 7E 8M 10Supply CurrentC 16E 17M 39C 16E 17M 718+25°CSourcing: 0mA ≤ IOUT≤ 15mASinking: -15mA ≤ IOUT≤ 0mA∆VOUT/∆IOUTLoad Regulation (Note 2) ppm/mAMAX6325/MAX6341/MAX63501ppm/°C, Low-Noise, +2.5V/+4.096V/+5VVoltage References4 _______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—MAX6350(VIN= +10V, IOUT= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)(Note 4)V4.999 5.000 5.001VOUTOutput Voltage