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

Transcription

1 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 range (-4 C to +125 C) and excellent ±.1% initial accuracy. This device features buried-zener technology for low noise performance. The load-regulation specification is guaranteed for source and sink currents up to 15m. Excellent line and load regulation and low output impedance at high frequency make the ideal for high-resolution data-conversion systems up to 16 bits. The is set for 2.5V, 4.96V, and 5.V outputs. pplications High-ccuracy Industrial and Process Control TE Equipment Precision Current Sources Features Low 2ppm/ C Temperature Coefficient over -4 C to +125 C Range Very Low 1.5µVp-p Noise (.1Hz to 1Hz) ±.1% Initial ccuracy ±15m Output Source and Sink Current 8V to 4V Input Voltage Range Optional Noise Reduction and Voltage Trim Excellent Transient Response Low 2ppm/1hr Long-Term Stability Stable for ll Capacitive Loads PRT Ordering Information TEMP. RNGE PIN- PCKGE OUPUT VOLTGE (V) S25-4 C to +125 C 8 SO 2.5 S41-4 C to +125 C 8 SO 4.96 S5-4 C to +125 C 8 SO 5. Typical Operating Circuit Pin Configuration 8V TO 4V INPUT TOP VIEW IN OUT REFERENCE OUT I.C. 1 8 I.C. 2.2µF * NR TRIM IN NR I.C. OUT GND 2.2µF * GND 4 5 TRIM SOIC *OPTIONL (STLE WITH LL CPCITIVE LODS) 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 SOLUTE MXIMUM RTINGS (Voltages Referenced to GND) IN...-.3V to +42V 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 42V)...5s OUT Short-Circuit to IN Duration (V IN 12V)...Continuous Continuous Power Dissipation (T = +7 C) 8-Pin SO (derate 5.9mW/ C above +7 C)...471mW Operating Temperature Range...-4 C to +125 C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 C Stresses beyond those listed under bsolute 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. ELECTRICL CHRCTERISTICS (+2.5V) (V IN = +1V, I OUT = m, T = T MIN to T MX, unless otherwise noted. Typical values are at T = +25 C.) PRMETER SYMOL CONDITIONS T MIN TYP MX UNITS Input Voltage Range V IN 8 4 V Output Voltage V OUT +25 C V Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) Load Regulation (Note 2) TCV OUT 2 2 ppm/ C V IN I OUT 8V V IN 4V Sourcing: m I OUT 15m Sinking: -15m I OUT m +25 C C Supply Current I IN 3.3 Trim-djustment Range V OUT (Figure 1) ±15 ±25 mv Turn-On Settling Time t ON To ±.1% of final value 5 µs Output Noise Voltage (Note 3) 3 ppm/v ppm/m.1hz f 1Hz 1.5 µvp-p e N 1Hz f 1kHz µv RMS Temperature Hysteresis (Note 4) 2 ppm Long-Term Stability V OUT t = 1hr 2 ppm m 2

3 Low-Noise, Precision, +2.5V/+4.96V/+5V ELECTRICL CHRCTERISTICS (+4.96V) (V IN = +1V, I OUT = m, T = T MIN to T MX, unless otherwise noted. Typical values are at T = +25 C.) PRMETER SYMOL CONDITIONS T MIN TYP MX UNITS Input Voltage Range V IN 8 4 V Output Voltage V OUT +25 C V Output VoltageTemperature Coefficient (Note 1) Line Regulation (Note 2) Load Regulation (Note 2) TCV OUT 2 2 ppm/ C V IN I OUT 8V V IN 4V Sourcing: m I OUT 15m Sinking: -15m I OUT m +25 C C Supply Current I IN ppm/v ppm/m m Trim-djustment Range V OUT (Figure 1) ±24 ±4 mv Turn-On Settling Time t ON To ±.1% of final value 5 µs Output Noise Voltage (Note 3).1Hz f 1Hz 2.4 µvp-p e N 1Hz f 1kHz µv RMS Temperature Hysteresis (Note 4) 2 ppm Long-Term Stability V OUT t = 1hr 2 ppm 3

4 Low-Noise, Precision, +2.5V/+4.96V/+5V ELECTRICL CHRCTERISTICS (+5.V) (V IN = +1V, I OUT = m, T = T MIN to T MX, unless otherwise noted. Typical values are at T = +25 C.) PRMETER SYMOL CONDITIONS T MIN TYP MX UNITS Input Voltage Range V IN 8 4 V Output Voltage V OUT +25 C V Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) Load Regulation (Note 2) TCV OUT 2 2 ppm/ C V IN I OUT 8V V IN 4V Sourcing: m I OUT 15m Sinking: -15m I OUT m +25 C C Supply Current I IN ppm/v ppm/m m Trim-djustment Range V OUT (Figure 1) ±3 ±5 mv Turn-On Settling Time t ON To ±.1% of final value 5 µs Output Noise Voltage (Note 3).1Hz f 1Hz 3. µvp-p e N 1Hz f 1kHz µv RMS Temperature Hysteresis (Note 4) 2 ppm Long-Term Stability V OUT t = 1hr 2 ppm 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 x V IN )) and load regulation ( (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 = +25 C by measuring V OUT before and after changing temperature by +25 C. 4

5 Low-Noise, Precision, +2.5V/+4.96V/+5V (V IN = +1V, I OUT = m, T = +25 C, unless otherwise noted.) VOUT (mv) _5 NORMLIZED OUTPUT VOLTGE vs. TEMPERTURE toc TEMPERTURE ( C) VOUT (ppm) VOUT (mv) _41 NORMLIZED OUTPUT VOLTGE vs. TEMPERTURE TEMPERTURE ( C) Typical Operating Characteristics toc VOUT (ppm) VOUT (mv) _25 NORMLIZED OUTPUT VOLTGE vs. TEMPERTURE toc TEMPERTURE ( C) 8 4 VOUT (ppm) VOUT (µv) _5 CHNGE IN OUTPUT VOLTGE vs. OUTPUT CURRENT T = -4 C T = +85 C T = +25 C I OUT (m) toc4 VOUT (µv) _41 CHNGE IN OUTPUT VOLTGE vs. OUTPUT CURRENT T = +25 C T = -4 C T = +85 C I OUT (m) toc5 VOUT (µv) _25 CHNGE IN OUTPUT VOLTGE vs. OUTPUT CURRENT T = -4 C T = +85 C T = +25 C I OUT (m) toc6 VOUT (ppm) CHNGE IN OUTPUT VOLTGE vs. INPUT VOLTGE toc7 SUPPLY CURRENT (m) SUPPLY CURRENT vs. SUPPLY VOLTGE _5 _41 _25 toc8 SUPPLY CURRENT (m) SUPPLY CURRENT vs. TEMPERTURE _5 _41 _25 toc V IN (V) SUPPLY VOLTGE (V) TEMPERTURE ( C) 5

6 Low-Noise, Precision, +2.5V/+4.96V/+5V Typical Operating Characteristics (continued) (V IN = +1V, I OUT = m, T = +25 C, unless otherwise noted.) OUTPUT NOISE DENSITY (nv/ Hz) _25 OUTPUT NOISE-VOLTGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF 1 1 1k 1k toc1 OUTPUT NOISE DENSITY (nv/ Hz) _41 OUTPUT NOISE-VOLTGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF 1 1 1k 1k toc11 OUTPUT NOISE DENSITY (nv Hz) _5 OUTPUT NOISE-VOLTGE DENSITY vs. FREQUENCY C NR = µf C NR = 1µF 1 1 1k 1k toc12 _25.1Hz TO 1Hz NOISE toc13 _41.1Hz TO 1Hz NOISE toc14 _5.1Hz TO 1Hz NOISE toc15 C OUT = C NR = µf C OUT = C NR = µf C OUT = C NR = µf VOUT,.5µV/div VOUT, 1µV/div VOUT, 1µV/div 1s/div 1s/div 1s/div 1 OUTPUT IMPEDNCE vs. FREQUENCY toc RIPPLE REJECTION vs. FREQUENCY (C NR = 1µF) _25 toc RIPPLE REJECTION vs. FREQUENCY (C NR = µf) _41 _25 toc18 OUTPUT IMPEDNCE (Ω) I SINK = 5m RIPPLE REJECTION (d) _5 _41 RIPPLE REJECTION (d) _5 I SOURCE = 5m k 1k 1k 1M k 1k k 1k 6

7 Low-Noise, Precision, +2.5V/+4.96V/+5V Typical Operating Characteristics (continued) (V IN = +1V, I OUT = m, T = +25 C, unless otherwise noted.) _5 LOD-TRNSIENT RESPONSE (SOURCING) toc19 m -1m _5 LOD-TRNSIENT RESPONSE (SINKING) toc2 1m m 2µs/div : I OUT, 1m/div (SOURCING) : V OUT, 5µV/div : I OUT, 1m/div (SINKING) : V OUT, 5µV/div 2µs/div _5 LOD-TRNSIENT RESPONSE toc21 +1m -1m _25 TURN-ON ND TURN-OFF TRNSIENT RESPONSE toc22 +1V V IN = 1V C OUT = C NR = µf C IN = C OUT = C NR = µf 1µs/div : I OUT (±1m SOURCE ND SINK), 2m/div, C COUPLED : V OUT, 2mV/div, C COUPLED : V IN, 1V/div : V OUT, 1V/div 1µs/div _41 TURN-ON ND TURN-OFF TRNSIENT RESPONSE toc22 _5 TURN-ON ND TURN-OFF TRNSIENT RESPONSE toc24 +1V +1V C IN = C OUT = C NR = µf C IN = C OUT = C NR = µf 1µs/div 1µs/div : V IN, 1V/div : V OUT, 1V/div : V IN, 1V/div : V OUT, 1V/div 7

8 Low-Noise, Precision, +2.5V/+4.96V/+5V Pin Description PIN NME 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. llows ±1% output adjustment (Figure 1). Leave open if not used. 6 OUT Output Detailed Description Temperature Stability The is a highly stable, low-noise voltage reference that uses a low-power temperature-compensation scheme to achieve laboratory-standard 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.6% (min) by connecting a 1kΩ potentiometer between OUT and GND, and connecting its tap to the TRIM pin (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. ypassing The is stable with capacitive load values from µf to 1µF, for all values of load current. dding an output bypass capacitor can help reduce noise and output glitching caused by load transients. pplications Information Negative Regulator Figure 3 shows how both a +5V and -5V precision reference can be obtained from a single unregulated +5V supply. The MX865 generates approximately ±9V to operate both the reference and the MX48 inverting amplifier. The +5V is inverted by the MX48. 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 4V INPUT 8V TO 4V INPUT IN OUT REFERENCE OUT IN OUT REFERENCE OUT NR GND TRIM 1kΩ 2.2µF* 1µF NR GND TRIM *OPTIONL Figure 1. Output Voltage djustment Figure 2. Noise-Reduction Capacitor 8

9 Low-Noise, Precision, +2.5V/+4.96V/+5V 3.3µF 3.3µF +5V INPUT C1+ V CC V+ C1- MX865 C2+ C2- GND V- C1 2.2µF C2 1µF NR IN GND OUT TRIM R1 1kΩ C3 2.2µF R2 1kΩ R3 1kΩ MX48 +REFERENCE OUT 2.2µF R4 1kΩ -REFERENCE OUT Figure 3. +5V and -5V References from a Single +5V Supply TRNSISTOR COUNT: 435 Chip Information 9

10 Low-Noise, Precision, +2.5V/+4.96V/+5V Package Information SOICN.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. 1 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, C 9486 (48) Maxim Integrated Products Printed US is a registered trademark of Maxim Integrated Products.