19-2266; Rev 2; 6/03 3ppm/°C, Low-Power, Low-Dropout Voltage Reference Features ♦ Low Temperature Coefficient 3ppm/°C (max), SO 5ppm/°C (max), µMAX ♦ Tiny 5mm ✕ 3mm µMAX Package ♦ Low 200mV (max) Dropout Voltage ♦ Low 40µA Quiescent Current ♦ ±0.04% (max) Initial Accuracy ♦ Low 16µVP-P Noise (0.1Hz to 10Hz) (2.5V Output) ♦ 15mA Output Source-Current Capability ♦ Wide 2.7V to 12.6V Supply Voltage ♦ Excellent Line (30µV/V, max) and Load (0.05mV/mA, max) Regulation Selector Guide Applications Precision Regulators A/D and D/A Converters Power Supplies High-Accuracy Industrial and Process Control Hand-Held Instruments SUFFIX VOLTAGE OUTPUT 25 2.500V 30 3.000V 41 4.096V 50 5.000V Ordering Information PART TEMP RANGE PIN-PACKAGE MAXIMUM INITIAL ACCURACY (%) MAXIMUM TEMPCO (ppm/°C, -40°C to +85°C) MAX6133A_ _ -40°C to +125°C 8 µMAX 0.06 5 MAX6133AASA_ _ -40°C to +125°C 8 SO 0.04 3 MAX6133BASA_ _ -40°C to +125°C 8 SO 0.08 5 Note: Two-number part suffix indicates output voltage option. Pin Configuration Typical Operating Circuit TOP VIEW SUPPLY INPUT REFERENCE OUTPUT IN OUT 0.1µF* MAX6133 N.C. 1 8 I.C.* 7 N.C. 3 6 OUT GND 4 5 I.C.* IN 2 MAX6133 0.1µF N.C. GND SO/µMAX *INPUT CAPACITORS ARE OPTIONAL. *INTERNALLY CONNECTED, DO NOT CONNECT. ________________________________________________________________ Maxim Integrated Products For 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. 1 MAX6133 General Description The MAX6133 high-precision, low-power, low-dropout voltage reference features a low 3ppm/°C (max) temperature coefficient and a low dropout voltage (200mV, max). This series-mode device features bandgap technology for low-noise performance and excellent accuracy. Load regulation specifications are guaranteed for source currents up to 15mA. The laser-trimmed, highstability thin-film resistors, together with post-package trimming, guarantee an excellent initial accuracy specification (0.04%, max). The MAX6133 is a series voltage reference and consumes only 40µA of supply current (virtually independent of supply voltage). Series-mode references save system power and use minimal external components compared to 2-terminal shunt references. The MAX6133 is available in 8-pin µMAX and SO packages. The unique blend of tiny packaging and excellent precision performance make these parts ideally suited for portable and communication applications. MAX6133 3ppm/°C, Low-Power, Low-Dropout Voltage Reference ABSOLUTE MAXIMUM RATINGS Voltage (with Respect to GND) IN ........................................................................-0.3V to +13V OUT..............................................-0.3V to +6V or (VIN + 0.3V) OUT Short Circuit to IN or GND Duration ...............................60s Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 5.5mW/°C above +70°C) .............362mW 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C 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—MAX6133_25 (VOUT = 2.500V) (VIN = 5V, CLOAD = 0.1µF, IOUT = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER Output Voltage SYMBOL VOUT Output Voltage Accuracy CONDITIONS TA = +25°C TA = +25°C A grade SO Output Voltage Temperature Coefficient (Note 1) TCVOUT B grade SO µMAX Input Voltage Range VIN ∆VOUT/∆VIN Load Regulation ∆VOUT/∆IOUT -100µA ≤ IOUT ≤ 15mA VDO Quiescent Supply Current IIN Output Short-Circuit Current ISC Output Voltage Noise Turn-On Settling Time TYP MAX 2.4990 2.5000 2.5010 B grade SO 2.4980 2.5000 2.5020 µMAX A grade SO 2.4985 -0.04 2.5000 2.5015 +0.04 B grade SO -0.08 +0.08 µMAX -0.06 +0.06 TA = -40°C to +85°C TA = -40°C to +125°C 1 4 TA = -40°C to +85°C 3 5 TA = -40°C to +125°C 5 10 TA = -40°C to +85°C TA = -40°C to +125°C 1 2 5 7 Inferred from line regulation Line Regulation Dropout Voltage (Note 2) MIN A grade SO 2.7V ≤ VIN ≤ 12.6V 2 V % 3 7 ppm/°C 12.6 V 2 30 µV/V mV/mA 0.003 0.05 ∆VOUT = 0.1%, IOUT = 1mA 0.02 0.2 ∆VOUT = 0.1%, IOUT = 10mA 0.2 0.4 TA = +25°C 40 60 TA = -40°C to +125°C 85 V µA Short to GND: VOUT = 0V 90 Short to VIN: VOUT = VIN -2 en 0.1Hz ≤ f ≤ 10Hz 10Hz ≤ f ≤ 1kHz 16 12 µVP-P µVRMS tON VOUT settles to ±0.01% of final value 500 µs 120 ppm Thermal Hysteresis (Note 3) Long-Term Stability 2.7 UNITS ∆t = 1000 hours SO 40 µMAX 145 _______________________________________________________________________________________ mA ppm 3ppm/°C, Low-Power, Low-Dropout Voltage Reference MAX6133 ELECTRICAL CHARACTERISTICS—MAX6133_30 (VOUT = 3.0000V) (VIN = 5V, CLOAD = 0.1µF, IOUT = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL Output Voltage VOUT Output Voltage Accuracy CONDITIONS TA = +25°C TA = +25°C A grade SO Output Voltage Temperature Coefficient (Note 1) TCVOUT B grade SO µMAX Input Voltage Range VIN ∆VOUT/∆VIN Load Regulation ∆VOUT/∆IOUT -100µA ≤ IOUT ≤ 15mA VDO Quiescent Supply Current IIN Output Short-Circuit Current ISC Output Voltage Noise en Turn-On Settling Time tON TYP MAX 2.9988 3.0000 3.0012 B grade SO 2.9976 3.0000 3.0024 µMAX 2.9982 3.0000 3.0018 A grade SO -0.04 +0.04 B grade SO -0.08 +0.08 µMAX -0.06 1 3 TA = -40°C to +125°C 4 7 TA = -40°C to +85°C 3 5 TA = -40°C to +125°C 5 10 TA = -40°C to +85°C 1 5 TA = -40°C to +125°C 3.2V ≤ VIN ≤ 12.6V 2 3.2 V % ppm/°C 7 12.6 V 2 30 µV/V mV/mA 0.003 0.06 ∆VOUT = 0.1%, IOUT = 1mA 0.01 0.2 ∆VOUT = 0.1%, IOUT = 10mA 0.2 0.4 TA = +25°C 40 60 TA = -40°C to +125°C 85 V µA Short to GND: VOUT = 0V 90 Short to VIN: VOUT = VIN -2 0.1Hz ≤ f ≤ 10Hz 24 µVP-P 10Hz ≤ f ≤ 1kHz 15 µVRMS VOUT settles to ±0.01% of final value 600 µs 120 ppm Thermal Hysteresis (Note 3) Long-Term Stability UNITS +0.06 TA = -40°C to +85°C Inferred from line regulation Line Regulation Dropout Voltage (Note 2) MIN A grade SO ∆t = 1000 hours SO 40 µMAX 145 mA ppm _______________________________________________________________________________________ 3 MAX6133 3ppm/°C, Low-Power, Low-Dropout Voltage Reference ELECTRICAL CHARACTERISTICS—MAX6133_41 (VOUT = 4.096V) (VIN = 5V, CLOAD = 0.1µF, IOUT = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER Output Voltage SYMBOL VOUT Output Voltage Accuracy CONDITIONS TA = +25°C TA = +25°C A grade SO Output Voltage Temperature Coefficient (Note 1) TCVOUT B grade SO µMAX Input Voltage Range VIN ∆VOUT/∆VIN Load Regulation ∆VOUT/∆IOUT -100µA ≤ IOUT ≤ 15mA VDO Quiescent Supply Current IIN Output Short-Circuit Current ISC Output Voltage Noise en Turn-On Settling Time tON TYP MAX 4.0943 4.0960 4.0977 B grade SO 4.0927 4.0960 4.0993 µMAX 4.0935 4.0960 4.0985 A grade SO -0.04 +0.04 B grade SO -0.08 +0.08 µMAX -0.06 +0.06 TA = -40°C to +85°C 4 7 3 5 TA = -40°C to +125°C 5 10 TA = -40°C to +85°C 1 5 TA = -40°C to +125°C 2 4.2V ≤ VIN ≤ 12.6V 4 4.2 UNITS V % 3 TA = -40°C to +85°C ppm/°C 7 12.6 V 2 40 µV/V 0.003 0.08 mV/mA ∆VOUT = 0.1%, IOUT = 1mA 0.01 0.2 ∆VOUT = 0.1%, IOUT = 10mA 0.2 0.4 TA = +25°C 45 65 TA = -40°C to +125°C 85 V µA Short to GND: VOUT = 0V 90 Short to VIN: VOUT = VIN -2 0.1Hz ≤ f ≤ 10Hz 32 µVP-P 10Hz ≤ f ≤ 1kHz 22 µVRMS VOUT settles to ±0.01% of final value 800 µs 120 ppm Thermal Hysteresis (Note 3) Long-Term Stability 1 TA = -40°C to +125°C Inferred from line regulation Line Regulation Dropout Voltage (Note 2) MIN A grade SO ∆t = 1000 hours SO 40 µMAX 145 _______________________________________________________________________________________ mA ppm 3ppm/°C, Low-Power, Low-Dropout Voltage Reference MAX6133 ELECTRICAL CHARACTERISTICS—MAX6133_50 (VOUT = 5.000V) (VIN = 5.5V, CLOAD = 0.1µF, IOUT = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL Output Voltage VOUT Output Voltage Accuracy CONDITIONS TA = +25°C TA = +25°C A grade SO Output Voltage Temperature Coefficient (Note 1) TCVOUT B grade SO µMAX Input Voltage Range VIN ∆VOUT/∆VIN Load Regulation ∆VOUT/∆IOUT -100µA ≤ IOUT ≤ 15mA VDO Quiescent Supply Current IIN Output Short-Circuit Current ISC Output Voltage Noise en Turn-On Settling Time tON TYP MAX 4.9980 5.0000 5.0020 B grade SO 4.9960 5.0000 5.0040 µMAX 4.9970 5.0000 5.0030 A grade SO -0.04 +0.04 B grade SO -0.08 +0.08 µMAX -0.06 +0.06 TA = -40°C to +85°C 4 7 3 5 TA = -40°C to +125°C 5 10 TA = -40°C to +85°C 1 5 TA = -40°C to +125°C 2 5.2V ≤ VIN ≤ 12.6V 5.2 UNITS V % 3 TA = -40°C to +85°C ppm/°C 7 12.6 V 2 50 µV/V 0.01 0.10 mV/mA ∆VOUT = 0.1%, IOUT = 1mA 0.02 0.2 ∆VOUT = 0.1%, IOUT = 10mA 0.2 0.4 TA = +25°C 40 60 TA = -40°C to +125°C 85 V µA Short to GND: VOUT = 0V 90 Short to VIN: VOUT = VIN -2 0.1Hz ≤ f ≤ 10Hz 40 µVP-P 10Hz ≤ f ≤ 1kHz 26 µVRMS 1000 µs 120 ppm VOUT settles to ±0.01% of final value Thermal Hysteresis (Note 3) Long-Term Stability 1 TA = -40°C to +125°C Inferred from line regulation Line Regulation Dropout Voltage (Note 2) MIN A grade SO ∆t = 1000 hours SO 40 µMAX 145 mA ppm Note 1: The MAX6133 is 100% drift-tested for TA = TMIN to TMAX, as specified. Note 2: Dropout Voltage is the minimum voltage at which VOUT changes ≤ 0.1% from VOUT at VIN = 5V (VIN = 5.5V for VOUT = 5V). Note 3: Thermal Hysteresis is defined as the change in the initial +25°C output voltage after cycling the device from TMAX to TMIN. _______________________________________________________________________________________ 5 Typical Operating Characteristics (VIN = 5V, IOUT = 0, TA = +25°C, unless otherwise noted.) (Note 4) 2.5002 2.5000 2.4998 5.0000 4.9995 4.9990 2.4996 2.5025 TA = +85°C 2.5020 2.5015 TA = +25°C 2.5010 TA = -40°C 2.5005 2.4995 2.4992 2.4990 4.9980 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT CURRENT (mA) DROPOUT VOLTAGE vs. OUTPUT CURRENT (VOUT = 2.5V) DROPOUT VOLTAGE vs. OUTPUT CURRENT (VOUT = 5V) TA = +25°C 5.0005 DROPOUT VOLTAGE (mV) 5.0010 TA = +125°C 5.0000 4.9995 4.9990 4.9985 TA = +85°C 400 TA = +125°C 300 TA = +25°C 200 100 TA = +85°C TA = -40°C 500 TA = -40°C 0 4.9980 4 6 8 10 12 14 16 18 20 0 2 4 OUTPUT CURRENT (mA) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 2.5V) -20 8 -20 PSRR (dB) -60 -80 -100 -100 -120 0.0001 0.001 0.01 -120 0.0001 0.001 0.01 350 300 250 200 1 10 100 1000 TA = +85°C TA = +25°C 150 100 50 0 TA = -40°C 0 2 4 6 8 10 12 14 16 18 20 150 135 120 105 90 75 60 TA = +85°C TA = +125°C 45 30 15 0.1 TA = +125°C SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 2.5V) -80 FREQUENCY (kHz) VIN = 5.5V POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 5V) -40 -60 10 12 14 16 18 20 OUTPUT CURRENT (mA) VIN = 5.5V -40 8 400 10 12 14 16 18 20 0 MAX6133 toc07 0 6 6 OUTPUT CURRENT (mA) SUPPLY CURRENT (µA) 2 MAX6133 toc08 0 4 MAX6133 toc06 600 600 550 500 450 2 MAX6133 toc09 5.0015 700 MAX6133 toc05 VIN = 5.5V MAX6133 toc04 5.0020 DROPOUT VOLTAGE (mV) LOAD REGULATION (VOUT = 5V) 6 TA = +125°C 2.5030 2.5000 4.9985 2.4994 OUTPUT VOLTAGE (V) 2.5035 OUTPUT VOLTAGE (V) 2.5004 3 TYPICAL UNITS VIN = 5.5V 5.0005 OUTPUT VOLTAGE (V) 2.5006 2.5040 MAX6133 toc02 3 TYPICAL UNITS 2.5008 OUTPUT VOLTAGE (V) 5.0010 MAX6133 toc01 2.5010 LOAD REGULATION (VOUT = 2.5V) OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 5V) MAX6133 toc03 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 2.5V) PSRR (dB) MAX6133 3ppm/°C, Low-Power, Low-Dropout Voltage Reference TA = +25°C TA = -40°C 0 0.1 1 FREQUENCY (kHz) 10 100 1000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) _______________________________________________________________________________________ 3ppm/°C, Low-Power, Low-Dropout Voltage Reference 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 2.5V) SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 5V) VIN = 5.5V 200 SUPPLY CURRENT (µA) 180 160 MAX6133 toc11 MAX6133 toc10 220 TA = +85°C 140 120 VOUT 4µV/div 100 TA = +125°C 80 60 40 20 0 TA = -40°C TA = +25°C 0 1 2 3 4 5 6 7 8 9 10 11 12 13 1s/div INPUT VOLTAGE (V) 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 5V) LOAD TRANSIENT (VOUT = 2.5V) MAX6133 toc12 VIN = 5.5V MAX6133 toc13 COUT = 0.1µF VOUT 50mV/div AC-COUPLED 2.5V VOUT 10µV/div 10mA IOUT 10mA/div 0mA 1s/div LOAD TRANSIENT (VOUT = 2.5V) 400µs/div LOAD TRANSIENT (VOUT = 2.5V) MAX6133 toc14 MAX6133 toc15 COUT = 10µF COUT = 0.1µF VOUT 50mV/div AC-COUPLED 2.5V VOUT 50mV/div AC-COUPLED 2.5V 1mA IOUT 1mA/div -100µA 10mA IOUT 10mA/div 0mA 1ms/div 400µs/div _______________________________________________________________________________________ 7 MAX6133 Typical Operating Characteristics (continued) (VIN = 5V, IOUT = 0, TA = +25°C, unless otherwise noted.) (Note 4) MAX6133 3ppm/°C, Low-Power, Low-Dropout Voltage Reference Typical Operating Characteristics (continued) (VIN = 5V, IOUT = 0, TA = +25°C, unless otherwise noted.) (Note 4) LOAD TRANSIENT (VOUT = 2.5V) LINE TRANSIENT (VOUT = 2.5V) MAX6133 toc16 MAX6133 toc17 COUT = 10µF COUT = 0.1µF VOUT 20mV/div AC-COUPLED 2.5V 5.5V 4.5V VIN 500mV/div AC-COUPLED 2.5V VOUT 10mV/div AC-COUPLED 1mA IOUT 1mA/div -100µA 1ms/div 400µs/div LINE TRANSIENT (VOUT = 5V) TURN-ON TRANSIENT (VOUT = 2.5V) MAX6133 toc18 COUT = 0.1µF MAX6133 toc19 VIN = 5.5V 6.5V 5V VIN 500mV/div AC-COUPLED 5.5V VIN 2V/div 0V VOUT 1V/div 2.5V VOUT 10mV/div AC-COUPLED 5V 0V 1ms/div 100µs/div TURN-ON TRANSIENT (VOUT = 5V) TURN-ON TRANSIENT (VOUT = 2.5V) MAX6133 toc20 5.5V MAX6133 toc21 VIN 2V/div 5V VIN 2V/div 0V 0V VOUT 2V/div 5V VIN = 5.5V COUT = 0.1µF 0V 400µs/div 8 COUT = 0.1µF VOUT 1V/div 2.5V 0V COUT = 10µF 2ms/div _______________________________________________________________________________________ 3ppm/°C, Low-Power, Low-Dropout Voltage Reference 2.5008 VIN 2V/div 2 TYPICAL UNITS SO PACKAGE 2.5007 2.5010 MAX6133 toc23 MAX6133 toc22 5.5V 2.5006 2.5006 5V VIN = 5.5V COUT = 10µF 0V VOUT (V) VOUT (V) 0V VOUT 2V/div 2.5005 2.5004 2.5004 2.5002 2.5000 2.5003 2.4998 2.5002 2.4996 2.4994 2.5001 0 100 200 300 400 500 600 700 800 900 1000 2ms/div 2 TYPICAL UNITS µMAX PACKAGE 2.5008 0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS) TIME (HOURS) LONG-TERM STABILITY vs. TIME (VOUT = 5.0V) 5.0012 5.0010 VOUT (V) 5.0004 5.0003 5.0002 5.0001 5.0000 4.9997 4.9996 5.0014 MAX6133 toc26 5.0007 5.0006 5.0005 VOUT (V) LONG-TERM STABILITY vs. TIME (VOUT = 5.0V) MAX6133 toc25 5.0008 4.9999 4.9998 MAX6133 toc24 LONG-TERM STABILITY vs. TIME (VOUT = 2.5V) LONG-TERM STABILITY vs. TIME (VOUT = 2.5V) TURN-ON TRANSIENT (VOUT = 5V) 5.0008 5.0006 5.0004 2 TYPICAL UNITS SO PACKAGE 5.0002 5.0000 0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS) 2 TYPICAL UNITS µMAX PACKAGE 0 100 200 300 400 500 600 700 800 900 1000 TIME (HOURS) Note 4: Many of the MAX6133 Typical Operating Characteristics are extremely similar. The extremes of these characteristics are found in the MAX6133 (2.5V output) and the MAX6133 (5V output). The Typical Operating Characteristics of the remainder of the MAX6133 family typically lie between these two extremes and can be estimated based on their output voltages. _______________________________________________________________________________________ 9 MAX6133 Typical Operating Characteristics (continued) (VIN = 5V, IOUT = 0, TA = +25°C, unless otherwise noted.) (Note 4) 3ppm/°C, Low-Power, Low-Dropout Voltage Reference MAX6133 Pin Description PIN NAME 1, 3, 7 N.C. 2 IN FUNCTION No Connection. Not connected internally. Leave unconnected or connect to GND. Positive Power-Supply Input 4 GND 5, 8 I.C. Internally Connected. Do not connect externally. Ground 6 OUT Reference Output Voltage. Connect a 0.1µF minimum capacitor to GND. Applications Information Bypassing/Load Capacitance For the best line-transient performance, decouple the input with a 0.1µF ceramic capacitor as shown in the Typical Operating Circuit. Place the capacitor as close to IN as possible. When transient performance is less important, no capacitor is necessary. The MAX6133 family requires a minimum output capacitance of 0.1µF for stability and is stable with capacitive loads (including the bypass capacitance) of up to 100µF. In applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit’s transient response. Place output capacitors as close to the device as possible. Turn-On Time These devices typically turn on and settle to within 0.01% of their final value in <1ms. The turn-on time can increase up to 2ms with the device operating at the minimum dropout voltage and the maximum load. Low-Power, 14-Bit DAC with MAX6133 as a Reference Figure 1 shows a typical application circuit for the MAX6133 providing both the power supply and precision reference voltage for a 14-bit high-resolution, serialinput, voltage-output digital-to-analog converter. The MAX6133 with a 2.5V output provides the reference voltage for the DAC. Supply Current The quiescent supply current of the MAX6133 series reference is typically 40µA and is virtually independent of the supply voltage. In the MAX6133 family, the load current is drawn from the input only when required, so supply current is not wasted and efficiency is maximized at all input voltages. This improved efficiency reduces power dissipation and extends battery life. When the supply voltage is below the minimum-specified input voltage (as during turn-on), the devices can draw up to 150µA beyond the nominal supply current. The input voltage source must be capable of providing this current to ensure reliable turn-on. 3V SUPPLY VDD IN 2.5V MAX6133 OUT GND MAX5143 REF ANALOG OUTPUT GND Thermal Hysteresis Thermal hysteresis is the change in the output voltage at TA = +25°C before and after the device is cycled over its entire operating temperature range. Hysteresis is caused by differential package stress appearing across the bandgap core transistors. The typical thermal hysteresis value is 120ppm for both SO and µMAX packages. 10 Figure 1. 14-Bit High-Resolution DAC and Positive Reference From a Single 3V Supply ______________________________________________________________________________________ 3ppm/°C, Low-Power, Low-Dropout Voltage Reference POSITIVE SUPPLY 0.1µF IN MAX6133 OUT V+ 0.1µF 0.1µF Temperature Coefficient vs. Operating Temperature Range for a 1LSB Maximum Error In a data converter application, the converter’s reference voltage must stay within a certain limit to keep the error in the data converter smaller than the resolution limit through the operating temperature range. Figure 3 shows the maximum allowable reference-voltage temperature coefficient that keeps the conversion error to less than 1LSB. This is a function of the operating temperature range (TMAX - TMIN) with the converter resolution as a parameter. The graph assumes the reference-voltage temperature coefficient as the only parameter affecting accuracy. In reality, the absolute static accuracy of a data converter is dependent on the combination of many parameters such as integral nonlinearity, differential nonlinearity, offset error, gain error, as well as voltage reference changes. GND -VOUT MAX400 Chip Information 0.1µF TRANSISTOR COUNT: 656 PROCESS: BiCMOS V- Figure 2. Negative Low-Power Voltage Reference 10,000 1000 100 TEMPERATURE COEFFICIENT (ppm/°C) 8 BIT 10 10 BIT 12 BIT 1 14 BIT 16 BIT 0.1 18 BIT 0.01 1 10 OPERATING TEMPERATURE RANGE (TMAX - TMIN) (°C) 20 BIT 100 Figure 3. Temperature Coefficient vs. Operating Temperature Range for a 1LSB Maximum Error ______________________________________________________________________________________ 11 MAX6133 Negative Low-Power Voltage Reference As shown in Figure 2, the MAX6133 can be used to develop a negative voltage reference using the MAX400, a rail-to-rail op-amp with low power, low noise, and low offset. The circuit only provides a good negative reference and is ideal for space- and costsensitive applications since it does not use resistors. Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS MAX6133 3ppm/°C, Low-Power, Low-Dropout Voltage Reference 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D A B e C 0∞-8∞ A1 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 12 ______________________________________________________________________________________ REV. B 1 1 3ppm/°C, Low-Power, Low-Dropout Voltage Reference 8 INCHES DIM A A1 A2 b E ÿ 0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 5.03 4.78 0.41 0.66 0∞ 6∞ 0.5250 BSC TOP VIEW A1 A2 A α c e b L SIDE VIEW FRONT VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0036 REV. J 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX6133 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)