Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References

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1 ; Rev 4; 1/1 Low-Noise, Precision, +2.5V/+4.96V/+5V General Description The // are low-noise, precision voltage references with extremely low 1ppm/ C temperature coefficients and excellent ±.2% initial accuracy. These devices feature buried-zener technology for lowest noise performance. Load-regulation specifications are guaranteed for source and sink currents up to 15mA. Excellent line and load regulation and low output impedance at high frequency make them ideal for high-resolution data-conversion systems up to 16 bits. The is set for 2.5V output, the is set for 4.96V output, and the is set for 5.V output. All three provide for the option of external trimming and noise reduction. High-Resolution Analog-to-Digital and Digital-to-Analog Converters High-Accuracy Reference Standard Applications High-Accuracy Industrial and Process Control Digital Voltmeters ATE Equipment Precision Current Sources Typical Operating Circuit Features Low 1.ppm/ C Temperature Coefficient Very Low 1.5µVp-p Noise (.1Hz to 1Hz) ±.2% Initial Accuracy ±15mA Output Source and Sink Current Low, 18mW Power Consumption () Industry-Standard Pinout Optional Noise Reduction and Voltage Trim Excellent Transient Response 8-Pin SO Package Available Low 2ppm/1hr Long-Term Stability Stable for All Capacitive Loads PART Ordering Information TEMP. RANGE PIN- PACKAGE MAX TEMPCO (ppm/ C) ACPA BCPA ACSA C to +7 C C to +7 C C to +7 C 8 Plastic DIP 8 Plastic DIP 8 SO BCSA C to +7 C 8 SO 5. AEPA -4 C to +85 C 8 Plastic DIP 3. BEPA -4 C to +85 C 8 Plastic DIP 7. AESA -4 C to +85 C 8 SO 3. BESA -4 C to +85 C 8 SO 7. AMJA -55 C to +125 C 8 CERDIP 5. BMJA -55 C to +125 C 8 CERDIP 8. Ordering Information continued at end of data sheet. Pin Configuration // 8V TO 36V INPUT TOP VIEW 2.2µF * NR IN OUT TRIM REFERENCE OUT 2.2µF * I.C. IN NR GND I.C. I.C. OUT TRIM GND DIP/SO *OPTIONAL I.C. = INTERNALLY CONNECTED; DO NOT USE Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 Low-Noise, Precision, +2.5V/+4.96V/+5V // ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) IN...-.3V to +4V OUT, TRIM...-.3V to +12V NR...-.3V to +6V OUT Short-Circuit to GND Duration (V IN 12V)...Continuous OUT Short-Circuit to GND Duration (V IN 4V)...5s OUT Short-Circuit to IN Duration (V IN 12V)...Continuous Continuous Power Dissipation (T A = +7 C) 8-Pin Plastic DIP (derate 9.9mW/ C above +7 C)...727mW 8-Pin SO (derate 5.88mW/ C above +7 C)...471mW 8-Pin CERDIP (derate 8.mW/ C above +7 C)...64mW 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 Operating Temperature Ranges MAX62 _C_ A... C to +7 C MAX62 _E_ A...-4 C to +85 C MAX62 _MJA C to +125 C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C (V IN = +1V, I OUT = ma, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A =.) Input Voltage Range Output Voltage PARAMETER Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) SYMBOL V IN V OUT TCV OUT V OUT / V IN A B AC_A AE_A AMJA BC_A BE_A BMJA 8V V IN 1V 1V V IN 36V CONDITIONS T A C, E, M MIN TYP MAX C E M C E M C 3 E 35 M C 7 E 8 M 1 UNITS V V ppm/ C ppm/v 2

3 Low-Noise, Precision, +2.5V/+4.96V/+5V ELECTRICAL CHARACTERISTICS (continued) (V IN = +1V, I OUT = ma, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A =.) PARAMETER SYMBOL CONDITIONS T A MIN TYP MAX UNITS C 1 6 Sourcing: ma I OUT 15mA E 1 7 V OUT / M 3 15 Load Regulation (Note 2) ppm/ma I OUT C 1 6 Sinking: -15mA OUT ma Sinking: -15mA I OUT ma E 1 7 M 1 3 Supply Current I IN C, E, M 3. ma Trim-Adjustment Range V OUT Figure 1 C, E, M ±15 ±25 mv Turn-On Settling Time t ON To ±.1% of final value 5 µs Output Noise Voltage (Note 3) e n.1hz f 1Hz 1.5 µvp-p 1Hz f 1kHz µv RMS Temperature Hysteresis Long-Term Stability V OUT / t (Note 4) 2 ppm 2 ppm/ 1hr // 3

4 // Low-Noise, Precision, +2.5V/+4.96V/+5V ELECTRICAL CHARACTERISTICS (V IN = +1V, I OUT = ma, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A =.) Output Voltage PARAMETER Input Voltage Range Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) Load Regulation (Note 2) Supply Current SYMBOL V IN V OUT TCV OUT V OUT / V IN V OUT / I OUT A B AC_A AE_A AMJA BC_A BE_A BMJA 8V V IN 1V 1V V IN 36V CONDITIONS Sourcing: ma I OUT 15mA Sinking: -15mA I OUT ma C, E, M MIN TYP MAX C E I IN C, E, M 3.2 T A M C E M C 3 E 35 M C 7 E 8 M 1 C 1 6 E 1 7 M 3 9 C 1 6 E 1 7 M 7 18 UNITS V V ppm/ C ppm/v ppm/ma ppm/ma ma Trim-Adjustment Range Temperature Hysteresis V OUT Figure 1 C, E, M ±24 ±4 mv Turn-On Settling Time t ON To ±.1% of final value 8 µs.1hz f 1Hz Output Noise Voltage (Note 3) e n 1Hz f 1kHz (Note 4) Long-Term Stability V OUT / t 2.4 µvp-p µv RMS 2 ppm 2 ppm/ 1hr 4

5 Low-Noise, Precision, +2.5V/+4.96V/+5V ELECTRICAL CHARACTERISTICS (V IN = +1V, I OUT = ma, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A =.) Output Voltage PARAMETER Input Voltage Range Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) Load Regulation (Note 2) SYMBOL V IN V OUT TCV OUT V OUT / V IN V OUT / I OUT A B AC_A AE_A AMJA BC_A BE_A BMJA 8V V IN 1V 1V V IN 36V CONDITIONS Sourcing: ma I OUT 15mA Sinking: -15mA I OUT ma C, E, M MIN TYP MAX C E Supply Current I IN C, E, M 3.3 T A C 3 E 35 M C 7 E 8 M 1 C 1 6 E 1 7 M 2 9 C 1 6 E 1 7 M M C E M UNITS V V ppm/ C ppm/v ppm/ma ma // Trim-Adjustment Range Temperature Hysteresis V OUT Figure 1 C, E, M ±3 ±5 mv Turn-On Settling Time t on To ±.1% of final value.1hz f 1Hz Output Noise Voltage (Note 3) e n 1Hz f 1kHz (Note 4) Long-Term Stability V OUT / t 1 µs 3. µvp-p µv RMS 2 ppm 2 ppm/ 1hr Note 1: Temperature coefficient is measured by the box method; i.e., the maximum V OUT is divided by T x V OUT. Note 2: Line regulation ( V OUT / (V OUT x V IN )) and load regulation ( V OUT / (V OUT x I OUT )) are measured with pulses and do not include output voltage changes due to die-temperature changes. Note 3: Noise specifications are guaranteed by design. Note 4: Temperature hysteresis is specified at T A = by measuring V OUT before and after changing temperature by using the PDIP package. 5

6 Low-Noise, Precision, +2.5V/+4.96V/+5V // VOUT (µv) Typical Operating Characteristics (V IN = +1V, I OUT = ma, T A =, unless otherwise noted.) VOUT (mv) NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE toc TEMPERATURE ( C) CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT T A = -4 C T A = +85 C T A = toc VOUT (ppm) VOUT (µv) VOUT (mv) NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE toc TEMPERATURE ( C) CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT T A = T A = -4 C T A = +85 C toc VOUT (ppm) VOUT (µv) VOUT (mv) NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE toc TEMPERATURE ( C) CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT T A = -4 C T A = +85 C T A = toc6 8 4 VOUT (ppm) I OUT (ma) I OUT (ma) I OUT (ma) VOUT (ppm) CHANGE IN OUTPUT VOLTAGE vs. INPUT VOLTAGE toc7 SUPPLY CURRENT (ma) SUPPLY CURRENT vs. SUPPLY VOLTAGE toc8 SUPPLY CURRENT (ma) SUPPLY CURRENT vs. TEMPERATURE toc V IN (V) SUPPLY VOLTAGE (V) TEMPERATURE ( C) 6

7 Low-Noise, Precision, +2.5V/+4.96V/+5V Typical Operating Characteristics (continued) (V IN = 1V, I OUT = ma, T A =, unless otherwise noted.) OUTPUT NOISE DENSITY (nv/ Hz) VOUT,.5µV/div OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF 1 1 1k 1k FREQUENCY (Hz) C OUT = C NR = µf.1hz to 1Hz NOISE toc1 toc13 OUTPUT NOISE DENSITY (nv/ Hz) VOUT, 1µV/div k 1k FREQUENCY (Hz) C OUT = C NR = µf OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF.1Hz to 1Hz NOISE toc11 toc14 OUTPUT NOISE DENSITY (nv/ Hz) VOUT, 1µV/div OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF 1 1 1k 1k FREQUENCY (Hz) C OUT = C NR = µf.1hz to 1Hz NOISE toc12 toc15 // 1sec/div 1sec/div 1sec/div OUTPUT IMPEDANCE (Ω) OUTPUT IMPEDANCE vs. FREQUENCY I SINK = 5mA toc16 RIPPLE REJECTION (db) RIPPLE REJECTION vs. FREQUENCY (C NR = 1µF) toc17 RIPPLE REJECTION (db) RIPPLE REJECTION vs. FREQUENCY (C NR = µf) MAX667/8 toc I SOURCE = 5mA 1 1 1k 1k 1k 1M FREQUENCY (Hz) k 1k FREQUENCY (Hz) k 1k FREQUENCY (Hz) 7

8 Low-Noise, Precision, +2.5V/+4.96V/+5V // Typical Operating Characteristics (continued) (V IN = 1V, I OUT = ma, T A =, unless otherwise noted.) A B A LOAD-TRANSIENT RESPONSE (SOURCING) 2µs/div A: I OUT, 1mA/div (SOURCING) B: V OUT, 5µV/div LOAD-TRANSIENT RESPONSE toc19 toc21 ma -1mA -1mA +1mA A A B LOAD-TRANSIENT RESPONSE (SINKING) A: I OUT, 1mA/div (SINKING) B: V OUT, 5µV/div 2µs/div toc2 TURN-ON AND TURN-OFF TRANSIENT RESPONSE toc22 +1V 1mA ma B B V IN = 1V C OUT = C NR = µf 1µs/div A: I OUT (±1mA SOURCE AND SINK), 2mA/div, AC COUPLED B: V OUT, 2mV/div, AC COUPLED C IN = C OUT = C NR = µf A: V IN, 1V/div B: V OUT, 1V/div 1µs/div TURN-ON AND TURN-OFF TRANSIENT RESPONSE toc23 TURN-ON AND TURN-OFF TRANSIENT RESPONSE toc24 A +1V A +1V B B C IN = C OUT = C NR = µf C IN = C OUT = C NR = µf 1µs/div 1µs/div A: V IN, 1V/div B: V OUT, 1V/div A: V IN, 1V/div B: V OUT, 1V/div 8

9 Low-Noise, Precision, +2.5V/+4.96V/+5V Pin Description PIN NAME FUNCTION 1, 7, 8 I.C. Internally Connected. Do not use. 2 IN Positive Power-Supply Input 3 NR 4 GND Ground 5 TRIM Noise Reduction. Optional capacitor connection for wideband noise reduction. Leave open if not used (Figure 2). External Trim Input. Allows ±1% output adjustment (Figure 1). Leave open if not used. 6 OUT Voltage Reference Output Detailed Description Temperature Stability The // are highly stable, low-noise voltage references that use a low-power temperature-compensation scheme to achieve laboratorystandard temperature stability. This produces a nearly flat temperature curve, yet does not require the power associated with heated references. The output voltage can be trimmed a minimum of.6% by connecting a 1kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin, as shown in Figure 1. The external trimming does not affect temperature stability. Noise Reduction To augment wideband noise reduction, add a 1µF capacitor to the NR pin (Figure 2). Larger values do not improve noise appreciably (see Typical Operating Characteristics). Noise in the power-supply input can affect output noise, but can be reduced by adding an optional bypass capacitor to the IN pin and GND. Bypassing The // are stable with capacitive load values from µf to 1µF, for all values of load current. Adding an output bypass capacitor can help reduce noise and output glitching caused by load transients. Applications Information Negative Regulator Figure 3 shows how both a +5V and -5V precision reference can be obtained from a single unregulated +5V supply. A MAX865 generates approximately ±9V to operate the reference and MAX432 inverting amplifier. The +5V is inverted by the MAX432 chopperstabilized amplifier. Resistor R1 is optional, and may be used to trim the ±5V references. R2 and R4 should be matched, both in absolute resistance and temperature coefficient. R3 is optional, and is adjusted to set the -5V reference. // 8V TO 36V INPUT 8V TO 36V INPUT NR IN OUT TRIM REFERENCE OUT 1k * NR IN OUT TRIM REFERENCE OUT GND 1µF GND *OPTIONAL Figure 1. Output Voltage Adjustment Figure 2. Noise-Reduction Capacitor 9

10 Low-Noise, Precision, +2.5V/+4.96V/+5V // 3.3µF 3.3µF C1+ C2+ 2.2µF +5V INPUT V CC V+ MAX865 GND V- C1 2.2µF C2 1µF NR IN GND Figure 3. +5V and -5V References from a Single +5V Supply Ordering Information (continued) PART TEMP. RANGE C2- C1- PIN- PACKAGE MAX TEMPCO (ppm/ C) ACPA BCPA ACSA C to +7 C C to +7 C C to +7 C 8 Plastic DIP 8 Plastic DIP 8 SO BCSA C to +7 C 8 SO 5. AEPA -4 C to +85 C 8 Plastic DIP 3. BEPA -4 C to +85 C 8 Plastic DIP 7. AESA -4 C to +85 C 8 SO 3. BESA -4 C to +85 C 8 SO 7. AMJA -55 C to +125 C 8 CERDIP 5. BMJA -55 C to +125 C 8 CERDIP 8. ACPA C to +7 C 8 Plastic DIP 2. BCPA C to +7 C 8 Plastic DIP 5. ACSA C to +7 C 8 SO 2. BCSA C to +7 C 8 SO 5. AEPA -4 C to +85 C 8 Plastic DIP 3. BEPA -4 C to +85 C 8 Plastic DIP 7. AESA -4 C to +85 C 8 SO 3. BESA -4 C to +85 C 8 SO 7. AMJA -55 C to +125 C 8 CERDIP 5. BMJA -55 C to +125 C 8 CERDIP 8. OUT TRIM R1 1kΩ C3 2.2µF R2 1kΩ R3 1kΩ R4 1kΩ C4 1µF MAX432 +REFERENCE OUT -REFERENCE OUT Chip Information TRANSISTOR COUNT: 435 1

11 Low-Noise, Precision, +2.5V/+4.96V/+5V Package Information PDIPN.EPS SOICN.EPS // 11

12 Low-Noise, Precision, +2.5V/+4.96V/+5V // Package Information (continued) CDIPS.EPS 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference

19-193; Rev ; 4/1 Low-Noise, Precision, +2.5V/+4.96V/+5V General Description The is a low-noise, precision voltage reference with extremely low 2ppm/ C temperature coefficient over the automotive temperature