19-0038; Rev 3; 6/07 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References The MAX873/MAX875/MAX876 precision 2.5V, 5V, and 10V references offer excellent accuracy and very low power consumption. Extremely low temperature drift combined with excellent line and load regulation permit stable operation over a wide range of electrical and environmental conditions. Operation for the MAX873 is guaranteed with a +4.5V supply, making the part ideal in systems running from a +5V 10% supply. Low 10Hz to 1kHz noise--typically 3.8VRMS, 9VRMS, and 18VRMS, respectively, for the MAX873, MAX875, MAX876--make the parts suitable for 12-bit data-acquisition systems. A TRIM pin facilitates adjustment of the reference voltage over a 6% range, using only a 100k potentiometer. A voltage output proportional to temperature provides a source for temperature compensation circuits, temperature warning circuits, and other applications. Features MAX873/MAX875/MAX876 +2.5V/+5V/+10V Outputs 1.5mV/2.0mV/3.0mV (max) Initial Accuracy 7ppm/C (max) Temperature Coefficient 450A (max) Quiescent Current Low Noise: 3.8VP-P (typ at 2.5V) Sources 10mA, Sinks 2mA 15ppm/mA Load Regulation (max) 4ppm/V Line Regulation (max) Wide Supply Voltage Range, +4.5V to +18V (MAX873) TEMP Output Proportional to Temperature Applications 12-Bit ADCs and DACs Typical Operating Circuit V+ Digital Multimeters Portable Data-Acquisition Systems IN Low-Power Test Equipment 0.1F* MAX873 MAX875 MAX876 +2.5V (MAX873) +5.0V (MAX875) +10.0V (MAX876) GND *OPTIONAL Pin Configuration appears at end of data sheet. OUT 0V Ordering Information/Selector Guide PINPACKAGE PART OUTPUT VOLTAGE (V) MAX TEMPCO (ppm/C) INITIAL ACCURACY % PKG CODE S8-4 MAX873AESA+ 8 SO 2.500 7 0.06 MAX873BESA+ 8 SO 2.500 20 0.10 S8-4 MAX875AESA+ 8 SO 5.000 7 0.04 S8-4 MAX875BESA+ 8 SO 5.000 20 0.06 S8-4 MAX876AESA+ 8 SO 10.000 7 0.03 S8-4 0.05 S8-4 MAX876BESA+ 8 SO 10.000 20 +Denotes a lead-free package. Note: All devices are specified over the -40C to +85C operating temperature range. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX873/MAX875/MAX876 General Description MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +20V OUT, TRIM, TEMP, TEST ..............................- 0.3V to (IN + 0.3V) Output Short-Circuit Duration (to GND)....................................5s Continuous Power Dissipation (TA = +70C) SO (derate 5.88mW/C above +70C) .........................471mW Operating Temperature Ranges: MAX87_ _E_A ..................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Junction Temperature (TJ) ...............................................+150C 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--MAX873 (VIN = +5V, IL = 0mA, CLOAD < 100pF, TA = -40C to +85C, unless otherwise noted.) PARAMETER Output Voltage Output-Voltage Drift (Note 1) Output-Noise Voltage SYMBOL VOUT TCVOUT en Line Regulation CONDITIONS 2.4985 2.5000 2.5015 2.4975 2.5000 2.5025 MAX873A 2 7 MAX873B 5 20 TA = +25C IL = 0 to -1mA (sink) ISC UNITS V ppm/C 0.1Hz to 10Hz 3.8 VP-P 10Hz to 1kHz 6.8 VRMS TA = +25C 1 4.0 TA = -40C to +85C 2 6 TA = +25C 3 15 TA = -40C to +85C Load Regulation Short-Circuit Output Current MAX MAX873A (0.06%) IL = 0 to 10mA (source) IQ TYP MAX873B (0.10%) TA = +25C VIN = 4.5V to 18V Quiescent Supply Current MIN 3 20 TA = +25C 100 900 TA = -40C to +85C 150 1900 TA = +25C 300 450 TA = -40C to +85C 300 600 Output shorted to GND 60 VOUT Adjust Range Long-Term Output Drift ppm/V ppm/mA A mA 100 mV 50 ppm/kh TEMP PIN Voltage Output Temperature Sensitivity VTEMP TA = +25C TCVTEMP 570 mV 1.9 mV/C ELECTRICAL CHARACTERISTICS--MAX875 (VIN = +15V, IL = 0mA, CLOAD < 100pF, TA = -40C to +85C, unless otherwise noted.) PARAMETER Output Voltage Output Voltage Drift (Note 1) Output-Noise Voltage Line Regulation 2 SYMBOL VOUT TCVOUT en CONDITIONS TA = +25C MIN TYP MAX MAX875A (0.04%) 4.998 5.000 5.002 MAX875B (0.06%) 4.997 5.000 5.003 MAX875A 2 7 MAX875B 5 20 TA = +25C VIN = 7V to 18V UNITS V ppm/C 0.1Hz to 10Hz 9 VP-P 10Hz to 1kHz 14.5 VRMS TA = +25C 1 4.0 TA = -40C to +85C 2 6 _______________________________________________________________________________________ ppm/V Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References (VIN = +15V, IL = 0mA, CLOAD < 100pF, TA = -40C to +85C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS IL = 0 to 10mA (source) Load Regulation IL = 0 to -1mA (sink) Quiescent Supply Current IQ Short-Circuit Output Current ISC MIN TYP MAX TA = +25C 3 15 TA = -40C to +85C 3 20 TA = +25C 100 900 TA = -40C to +85C 150 1900 TA = +25C 320 550 TA = -40C to +85C 320 700 Output shorted to GND 60 VOUT Adjust Range Long-Term Output Drift UNITS ppm/mA A mA 300 mV 50 ppm/kh TEMP PIN Voltage Output VTEMP Temperature Sensitivity TA = +25C TCVTEMP 630 mV 2.1 mV/C ELECTRICAL CHARACTERISTICS--MAX876 (VIN = +15V, IL = 0mA, CLOAD < 100pF, TA = -40C to +85C, unless otherwise noted.) PARAMETER Output Voltage SYMBOL VOUT Output Voltage Drift (Note 1) TCVOUT Output-Noise Voltage en Line Regulation CONDITIONS TA = +25C 9.997 10.000 10.003 MAX876B (0.05%) 9.995 10.000 10.005 7 5 20 TA = +25C IL = 0 to -1mA (sink) ISC MAX876A (0.03%) 2 Load Regulation Short-Circuit Output Current MAX MAX876B IL = 0 to 10mA (source) IQ TYP MAX876A VIN = 12V to 18V Quiescent Supply Current MIN 0.1Hz to 10Hz 18 10Hz to 1kHz 29 TA = +25C 1 4.0 TA = -40C to +85C 1 6 TA = +25C 1 15 TA = -40C to +85C 1 20 TA = +25C 100 900 TA = -40C to +85C 150 1900 550 TA = -40C to +85C 340 700 Long-Term Output Drift ppm/C VRMS 320 Output shorted to GND V VP-P TA = +25C VOUT Adjust Range UNITS 60 ppm/V ppm/mA A mA 600 mV 50 ppm/kh TEMP PIN Voltage Output VTEMP Temperature Sensitivity TCVTEMP TA = +25C 630 mV 2.1 mV/C Note 1: Temperature coefficient is defined as maximum VOUT divided by maximum T of the temperature range. _______________________________________________________________________________________ 3 MAX873/MAX875/MAX876 ELECTRICAL CHARACTERISTICS--MAX875 (continued) Typical Operating Characteristics (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) 2.500 2.499 MAX873/75/76 toc02 LOAD REGULATION vs. SOURCE CURRENT (VOUT = 2.5V) 10.001 10.000 9.999 9.998 9.997 9.996 9.995 9.994 THREE TYPICAL PARTS 2.498 -25 0 25 50 75 100 125 0 -0.25 TA = +125C -50 -25 0 25 50 75 100 -0.50 125 0 5 10 15 20 25 TEMPERATURE (C) SOURCE CURRENT (mA) LOAD REGULATION vs. SOURCE CURRENT (VOUT = 10V) LOAD REGULATION vs. SINK CURRENT (VOUT = 2.5V) LOAD REGULATION vs. SINK CURRENT (VOUT = 10V) 0 -0.25 TA = -40C -0.50 TA = +25C 0.50 TA = +125C 0.25 0 TA = -40C -0.25 5 10 15 20 25 30 TA = -40C TA = +125C 0.5 0 TA = +25C -0.5 -1.0 -0.50 0 1.5 1.0 30 MAX873/75/76 toc06 0.75 2.0 OUTPUT VOLTAGE CHANGE (mV) TA = +125C MAX873/75/76 toc05 TA = +25C 0.25 1.00 OUTPUT VOLTAGE CHANGE (mV) MAX873/75/76 toc04 0 0.5 1.0 1.5 0 2.0 0.5 1.0 1.5 2.0 SOURCE CURRENT (mA) SINK CURRENT (mA) SINK CURRENT (mA) LINE REGULATION vs. TEMPERATURE (VOUT = 2.5V) LINE REGULATION vs. TEMPERATURE (VOUT = 10V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT (VOUT = 2.5V) 60 TA = +125C 40 20 250 TA = +125C 200 TA = -40C 150 100 50 10 15 20 25 INPUT VOLTAGE (V) 30 35 40 TA = +125C 1.5 TA = +25C 1.0 TA = -40C 0.5 0 5 2.0 TA = +25C TA = +25C 0 MAX873/75/76 toc09 TA = -40C 2.5 DROPOUT VOLTAGE (V) 80 300 OUTPUT VOLTAGE CHANGE (V) MAX873/75/76 toc07 100 MAX873/75/76 toc08 OUTPUT VOLTAGE CHANGE (mV) TA = +25C TEMPERATURE (C) 0.50 0 TA = -40C 0.25 THREE TYPICAL PARTS 9.993 -50 4 0.50 OUTPUT VOLTAGE CHANGE (mV) 10.002 OUTPUT VOLTAGE (V) 2.501 OUTPUT VOLTAGE (V) 10.003 MAX873/75/76 toc01 2.502 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 10V) MAX873/75/76 toc03 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 2.5V) OUTPUT VOLTAGE CHANGE (V) MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References 12 16 20 24 28 32 INPUT VOLTAGE (V) 36 40 0 4 8 12 SOURCE CURRENT (mA) _______________________________________________________________________________________ 16 20 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References MAX873/MAX875/MAX876 Typical Operating Characteristics (continued) (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) -40 TA = +25C -20 -40 PSRR (dB) PSRR (dB) 1.5 MAX873/75/76 toc12 -20 TA = +125C 0 MAX873/75/76 toc11 2.0 DROPOUT VOLTAGE (V) 0 MAX873/75/76 toc10 2.5 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 10V) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VOUT = 2.5V) MINIMUM INPUT-OUTPUT DIFFERENTIAL vs. SOURCE CURRENT (VOUT = 10V) -60 -80 -60 -80 -100 TA = -40C 1.0 -100 -120 -140 0.001 0.5 0 4 8 12 16 20 0.1 1 10 100 -120 0.001 1000 0.01 0.1 1 10 100 1000 SOURCE CURRENT (mA) FREQUENCY (kHz) FREQUENCY (kHz) OUTPUT IMPEDANCE vs. FREQUENCY (VOUT = 2.5V) SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 2.5V) SUPPLY CURRENT vs. INPUT VOLTAGE (VOUT = 10V) 0.1 350 300 TA = +25C 250 TA = -40C 200 150 400 MAX873/75/76 toc15 TA = +125C TA = +125C 350 SUPPLY CURRENT (A) 1 MAX873/75/76 toc14 10 400 SUPPLY CURRENT (A) MAX873/75/76 toc13 100 OUTPUT IMPEDANCE () 0.01 300 250 TA = +25C 200 TA = -40C 150 100 100 50 50 0.01 0.01 0.1 1 10 100 0 1000 5 10 15 20 25 30 35 0 40 5 10 15 20 25 30 35 FREQUENCY (kHz) INPUT VOLTAGE (V) INPUT VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE (VOUT = 2.5V) SUPPLY CURRENT vs. TEMPERATURE (VOUT = 10V) TEMP VOLTAGE vs. TEMPERATURE (VOUT = 2.5V) 275 325 300 -25 0 25 50 75 TEMPERATURE (C) 100 125 600 400 250 -50 700 500 275 250 MAX873/75/76 toc18 350 40 800 TEMP VOLTAGE (mV) 300 MAX873/75/76 toc17 325 375 SUPPLY CURRENT (A) MAX873/75/76 toc16 350 SUPPLY CURRENT (A) 0 0 0.001 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) 600 2.60 TWO TYPICAL PARTS 2.501 2.55 VOUT (V) 700 2.502 MAX873/75/76 toc20 800 2.65 OUTPUT VOLTAGE (V) MAX873/75/76 toc19 900 2.50 2.500 2.45 2.499 500 2.40 400 2.498 2.35 -25 0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 200 400 800 TIME (hours) LONG-TERM STABILITY vs. TIME (VOUT = 10.0V) OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY (VOUT = 2.5V) OUTPUT-VOLTAGE NOISE DENSITY vs. FREQUENCY (VOUT = 10V) 10.000 9.999 9.998 100 200 400 600 800 1000 10,000 1000 100 0.1 1 TIME (hours) 10 100 FREQUENCY (Hz) 1000 0.1 1 10 100 FREQUENCY (Hz) 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 10V) 0.1Hz TO 10Hz OUTPUT NOISE (VOUT = 2.5V) MAX873/75/76 toc26 MAX873/75/76 toc25 4V/div 1V/div 1s/div 1000 MAX873/75/76 toc24 10.001 1000 OUTPUT VOLTAGE-NOISE DENSITY (nV/Hz) MAX873/75/76 toc22 TWO TYPICAL PARTS 6 600 TRIM VOLTAGE (V) 10.002 0 0 2.5 TEMPERATURE (C) OUTPUT VOLTAGE-NOISE DENSITY (nV/Hz) -50 MAX873/75/76 toc23 TEMP VOLTAGE (mV) LONG-TERM STABILITY vs. TIME (VOUT = 2.500V) OUTPUT VOLTAGE vs. TRIM VOLTAGE (VOUT = 2.5V) MAX873/75/76 toc21 TEMP VOLTAGE vs. TEMPERATURE (VOUT = 10V) VOUT (V) MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References 1s/div _______________________________________________________________________________________ 1000 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References MAX873/MAX875/MAX876 Typical Operating Characteristics (continued) (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) LOAD TRANSIENT (VOUT = 10V, COUT = 0, 0 TO 20mA) LOAD TRANSIENT (VOUT = 2.5V, COUT = 0, 0 TO 20mA) MAX873/75/76 toc28 MAX873/75/76 toc27 20mA IOUT 20mA IOUT 0 0 VOUT AC-COUPLED 1V/div VOUT AC-COUPLED 1V/div 10s/div 10s/div LOAD TRANSIENT (VOUT = 10V, COUT = 1F, 0 TO 20mA) LOAD TRANSIENT (VOUT = 2.5V, COUT = 1F, 0 TO +20mA) MAX873/75/76 toc30 MAX873/75/76 toc29 20mA 20mA IOUT IOUT 0 0 VOUT AC-COUPLED 50mV/div VOUT AC-COUPLED 100mV/div 100s/div 200s/div LOAD TRANSIENT (VOUT = 10V, COUT = 0, 0 TO -2mA) LOAD TRANSIENT (VOUT = 2.5V, COUT = 0, 0 TO -2mA) MAX873/75/76 toc32 MAX873/75/76 toc31 0 0 IOUT 40s/div IOUT -2mA -2mA VOUT AC-COUPLED 200mV/div VOUT AC-COUPLED 20mV/div 200s/div _______________________________________________________________________________________ 7 MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References Typical Operating Characteristics (continued) (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) LOAD TRANSIENT (VOUT = 10V, COUT = 1F, 0 TO -2mA) LOAD TRANSIENT (VOUT = 2.5V, COUT = 1F, 0 TO -2mA) MAX873/75/76 toc34 MAX873/75/76 toc33 0 0 IOUT IOUT -2mA -2mA VOUT AC-COUPLED 20mV/div VOUT AC-COUPLED 5mV/div 400s/div 400s/div LINE TRANSIENT (VOUT = 10V) LINE TRANSIENT (VOUT = 2.5V) MAX873/75/76 toc35 MAX873/75/76 toc36 5.5V 4.5V 15.5V VIN 1V/div 14.5V VOUT AC-COUPLED 200mV/div VOUT AC-COUPLED 200mV/div VIN COUT = 0 2s/div 10s/div TURN-ON TRANSIENT (VOUT = 2.5V, COUT = 0) TURN-ON TRANSIENT (VOUT = 2.5V, COUT = 1F) MAX873/75/76 toc38 MAX873/75/76 toc37 VIN 2V/div VIN 2V/div GND GND VOUT 1V/div VOUT 1V/div GND COUT = 0 10s/div 8 GND 40s/div _______________________________________________________________________________________ Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References (VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25C, unless otherwise noted.) TURN-ON TRANSIENT (VOUT = 10V, COUT = 0) TURN-ON TRANSIENT (VOUT = 10V, COUT = 1F) MAX873/75/76 toc39 MAX873/75/76 toc40 VIN 5V/div VIN 5V/div GND GND VOUT 5V/div VOUT 5V/div GND GND 100s/div 200s/div Pin Description PIN NAME FUNCTION 1, 8 I.C. Internally Connected. Do not connect externally. 2 IN Positive Power-Supply Input 3 TEMP Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die temperature. 4 GND Ground 5 TRIM Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and GND for trimming. Leave unconnected to use the preset output voltage. 6 OUT Output Voltage 7 N.C. No Connection. Not internally connected. Detailed Description The MAX873/MAX875/MAX876 precision voltage references provide accurate preset +2.5V, +5.0V, and +10V reference voltages from up to +40V input voltages. These devices feature a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/C temperature coefficient and excellent 0.05% initial accuracy. The MAX873/MAX875/MAX876 draw 340A of supply current and source 30mA or sink 2mA of load current. Trimming the Output Voltage Trim the factory-preset output voltage on the MAX873/MAX875/MAX876 by placing a resistive divider network between OUT, TRIM, and GND. Use the following formula to calculate the change in output voltage from its preset value: VOUT = 2 x (VTRIM - VTRIM (open)) x k where: VTRIM = 0V to VOUT VTRIM (open) = VOUT (nominal) / 2 (typ) k = 6% (typ) For example, use a 50k potentiometer (such as the MAX5436) between OUT, TRIM, and GND with the potentiometer wiper connected to TRIM (see Figure 2). As the TRIM voltage changes from VOUT to GND, the output voltage changes accordingly. Set R2 to 1M or less. Currents through resistors R1 and R2 add to the quiescent supply current. _______________________________________________________________________________________ 9 MAX873/MAX875/MAX876 Typical Operating Characteristics (continued) MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References Temp Output The MAX873/MAX875/MAX876 provide a temperature output proportional to die temperature. TEMP can be calculated from the following formula: TEMP (V) = TJ (K) x n where TJ = the die temperature, n = the temperature multiplier, n = VTEMP (at TJ = T0 ) 1.9mV / K T0 TA = the ambient temperature. Self-heating affects the die temperature and conversely, the TEMP output. The TEMP equation assumes the output is not loaded. If device power dissipation is negligible, then TJ TA. Applications Information Bypassing/Output Capacitance For the best line-transient performance, decouple the input with a 0.1F 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 MAX873/MAX875/MAX876 do not require an output capacitor for stability and are stable with capacitive loads up to 100F. 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 devices as possible for best performance. Supply Current The MAX873/MAX875/MAX876 consume 320A (typ) of quiescent supply current. This improved efficiency reduces power dissipation and extends battery life. Thermal Hysteresis Thermal hysteresis is the change in the output voltage at TA = +25C 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. Turn-On Time The MAX873/MAX875/MAX876 typically turn on and settle to within 0.1% of the preset output voltage in 150s (2.5V output). The turn-on time can increase up to 150s with the device operating with a 1F load. Short-Circuited Outputs The MAX873/MAX875/MAX876 feature a short-circuit-protected output. Internal circuitry limits the output current to 60mA when short circuiting the output to ground. The output current is limited to 3mA when short circuiting the output to the input. 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 1. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error 10 ______________________________________________________________________________________ Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References In a data converter application, the reference voltage of the converter 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 1 shows the maximum allowable reference-voltage temperature coefficient to keep the conversion error to less than 1 LSB, as 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 voltagereference changes. ( VOUT + 2V) TO 40V INPUT IN OUT * MAX873 MAX875 MAX876 TEMP TRIM REFERENCE OUTPUT MAX5436 50k POTENTIOMETER GND *OPTIONAL. Figure 2. Applications Circuit Using the MAX5436 Potentiometer Pin Configuration Chip Information TRANSISTOR COUNT: 429 PROCESS: BiCMOS TOP VIEW I.C.* 1 IN 2 TEMP 3 MAX873 MAX875 MAX876 GND 4 8 I.C.* 7 N.C. 6 OUT 5 TRIM SO *INTERNALLY CONNECTED. DO NOT CONNECT. ______________________________________________________________________________________ 11 MAX873/MAX875/MAX876 Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error 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 MAX873/MAX875/MAX876 Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References 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 REV. B 1 1 Revision History Pages changed at Rev 3: 1-12 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX873AESA+T MAX873BESA+T MAX875AESA+ MAX875AESA+T MAX875BESA+T MAX876BESA+ MAX876BESA+T MAX873AESA+ MAX873BESA+ MAX875BESA+ MAX876AESA+ MAX876AESA+T