LT1027LS8 Precision, Low Noise, High Stability Hermetic Voltage Reference Description Features Hermetic 5mm × 5mm LCC Leadless Chip Carrier Package: nn Insensitive to Humidity nn Thermal Hysteresis: 8ppm (0°C to 70°C) nn Thermal Hysteresis: 12ppm (–40°C to 85°C) nn Low Drift: 5ppm/°C Max nn High Accuracy: ±0.10% Max nn Low Noise: <1ppm Peak-to-Peak (0.1Hz to 10Hz) nn Low Long Term Drift nn 12ppm at 1000Hr nn 18ppm at 3000Hr nn Sinks 10mA, Sources 15mA nn Wide Supply Range to 40V nn 8-Pin (5mm × 5mm) LS8 Package The LT®1027LS8 is a precision reference that combines low drift and noise with excellent long-term stability and high output accuracy. The reference output will source up to 15mA and sink up to 10mA, and remain constant with input voltage variations. nn The hermetic package provides outstanding humidity and thermal hysteresis performance. The LT1027LS8 is only 5mm × 5mm × 1.5mm, offering an alternative to large through-hole metal can voltage references, such as the industry standard LT1021. The LT1027LS8 offers similar performance to the LT1027, with additional stability from the hermetic package. LT1027LS8 is based on a buried Zener diode structure, which enables temperature and time stability, and extremely low noise performance of < 1ppm peak-to-peak. The LT1027LS8 operates on a supply voltage from 8V up to 40V. The subsurface Zener exhibits better time stability than even the best bandgap reference, and the hermetic package maintains that stability over a wide range of environmental conditions. Applications Instrumentation and Test Equipment High Resolution Data Acquisition Systems nn A/D and D/A Converters nn Precision Regulators nn Precision Scales nn Digital Voltmeters nn nn L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Supplying VREF and VCC to the LTC1290 12-Bit ADC Output Voltage Temperature Drift CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM ANALOG INPUTS 8V TO 40V VIN + 2.2µF LT1027LS8 GND SCLK ACLK DOUT DIN CS TO µC LTC1290 REF + VOUT VTRIM VCC 10k + REF – 22µF AGND V– DGND OUTPUT VOLTAGE (V) 5.010 5.005 5.000 4.995 4.990 –40 –25 0 25 50 TEMPERATURE (°C) 75 85 1027LS8 TA01b 1027LS8 TA01a 1027ls8f For more information www.linear.com/LT1027LS8 1 LT1027LS8 Absolute Maximum Ratings Pin Configuration (Note 1) Input Voltage..............................................................40V Input/Output Voltage Differential...............................35V Output to Ground Voltage............................................7V V TRIM to Ground Voltage Positive....................................................................5V Negative..............................................................–0.3V Output Short-Circuit Duration VIN > 20V...........................................................10 sec VIN ≤ 20V...................................................... Indefinite Operating Temperature Range LT1027C.................................................... 0°C to 70°C LT1027I.................................................– 40°C to 85°C Storage Temperature Range................... –65°C to 150°C TOP VIEW VIN NR 1 VOUT 2 VTRIM 3 8 4 7 NC* 6 NC* 5 NC* GND LS8 PACKAGE 8-PIN LEADLESS CHIP CARRIER (5mm × 5mm) *CONNECTED INTERNALLY. D0 NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS **SEE APPLICATIONS INFORMATION SECTION TJMAX = 125°C, θJA = 120°C/W PACKAGE LID IS GND Order Information (http://www.linear.com/product/LT1027LS8#orderinfo) LEAD FREE FINISH PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1027DCLS8-5#PBF 10275 8-Lead Ceramic LCC 5mm × 5mm 0°C to 70°C LT1027DILS8-5#PBF 10275 8-Lead Ceramic LCC 5mm × 5mm –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. 2 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, ILOAD = 0A unless otherwise specified. SYMBOL PARAMETER CONDITIONS VOUT Output Voltage (Note 2) TCVOUT Output Voltage Temperature Coefficient (Note 3) MIN TYP MAX UNITS 4.995 5.000 5.005 V 2 5 ppm/°C 6 12 25 ppm/V ppm/V 3 6 8 ppm/V ppm/V 8 12 15 15 ppm/mA ppm/mA ppm/mA 30 120 160 ppm/mA ppm/mA 2.2 3.1 3.5 mA mA l 8V ≤ VIN ≤ 10V Line Regulation (Note 4) l 10V ≤ VIN ≤ 40V l Load Regulation (Notes 4, 6) Sourcing Current 0 ≤ IOUT ≤ 15mA, 0°C to 85°C 0 ≤ IOUT ≤ 5mA, –40°C l Sinking Current 0 ≤ IOUT ≤ 10mA 0°C to 85°C –40°C l –8 –10 –10 Supply Current l VTRIM Adjust Range en l ±30 ±50 mV Output Noise (Note 5) 0.1Hz ≤ f ≤ 10Hz 3 10Hz ≤ f ≤ 1kHz 2.0 Long-Term Stability of Output Voltage (Note 7) ∆t = First 1000Hrs ∆t = First 3000Hrs 12 18 ppm ppm Temperature Hysteresis of Output (Note 8) ∆T = ±25°C ∆T = 0°C to 70°C ∆T = –40°C to 85°C 6 8 12 ppm ppm ppm Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Output voltage is measured immediately after turn-on. Changes due to chip warm-up are typically less than 0.005%. Note 3: Temperature coefficient is measured by dividing the change in output voltage over the temperature range by the change in temperature. Note 4: Line and load regulation are measured on a pulse basis. Output changes due to die temperature change must be taken into account separately. Note 5: RMS noise is measured with an 8-pole bandpass filter with a center frequency of 30Hz and a Q of 1.5. The filter output is then rectified and integrated for a fixed time period, resulting in an average, as opposed to RMS voltage. A correction factor is used to convert average to RMS. This value is then used to obtain RMS noise voltage in the 10Hz to 1000Hz frequency band. This test also screens for low frequency “popcorn” noise within the bandwidth of the filter. Note 6: Devices typically exhibit a slight negative DC output impedance of –0.015Ω. This compensates for PC trace resistance, improving regulation at the load. µVP-P 6.0 µVRMS Note 7: Long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. Total drift in the second thousand hours is normally less than one third that of the first thousand hours, with a continuing trend toward reduced drift with time. Significant improvement in long-term drift can be realized by preconditioning the IC with a 100-200 hour, 125°C burn in. Long term stability will also be affected by differential stresses between the IC and the board material created during board assembly. Temperature cycling and baking of completed boards is often used to reduce these stresses in critical applications. Note 8: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25°C, but the IC is cycled to high or low temperature before successive measurements. Hysteresis is roughly proportional to the square of temperature change. Hysteresis is not normally a problem for operational temperature excursions, but can be significant in critical narrow temperature range applications where the instrument might be stored at high or low temperatures. Hysteresis measurements are preconditioned by one temperature cycle. 1027ls8f For more information www.linear.com/LT1027LS8 3 LT1027LS8 Typical Performance Characteristics Ripple Rejection Output Impedance vs Frequency 100 100 OUTPUT IMPEDANCE (Ω) REJECTION (dB) 110 100 90 80 70 60 50 ∆I = 3mA AC ISOURCE = 5mA 10 OUTPUT VOLTAGE (V) VIN = 10V 120 Output Voltage Temperature Drift 5.010 1 0.1 5.005 5.000 4.995 0.01 10 100 1k FREQUENCY (Hz) 10k 10 100 1k 10k FREQUENCY (Hz) 100k 1M 4.990 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 1027LS8 G03 1027LS8 G01 1027LS8 G02 Start-Up and Turn-Off (No Load) Start-Up and Turn-Off Quiescent Current 2.5 VOUT 1V/DIV VIN 10V VIN RL = 1k, CL = 4.7µF 10V 1µs/DIV 1027LS8 G04 1027LS8 G05 500µs/DIV SUPPLY CURRENT (mA) 2.0 VOUT 1V/DIV 1.5 1.0 0.5 0 0 5 10 15 20 25 30 INPUT VOLTAGE (V) 35 40 1027LS8 G06 Output Short-Circuit Current vs Temperature Load Regulation 500 20 0 –400 –800 –1200 SOURCING 15 10 CHANGE IN OUTPUT VOLTAGE (µV) 400 SHORT–CIRCUIT CURRENT (mA) CHANGE IN OUTPUT VOLTAGE (µV) Line Regulation 25 800 VIN = 10V VOUT = 5V 5 0 –5 –10 –15 SINKING 1027LS8 G07 4 –25 –50 200 100 0 –100 –200 –300 –400 –20 –1600 –10 –8 –6 –4 –2 0 2 4 6 8 10 12 14 16 Sink Source IOUT (mA) 400 300 –30 –10 10 30 50 TEMPERATURE (°C) 70 90 1027LS8 G08 –500 8 12 16 20 24 28 32 INPUT VOLTAGE (V) 36 40 1027LS8 G09 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Typical Performance Characteristics Output Noise Voltage Density Output Settling Time (Sourcing) OUTPUT NOISE DENSITY (nV/√Hz) 200 180 VOUT 400µV/DIV AC-COUPLED 160 140 120 100 10mA LOAD STEP 80 CNR = 0 60 2µs/DIV 1027LS8 G11 CNR = 1µF 40 20 0 10 100 1k FREQUENCY (Hz) 10k 1027LS8 G10 0.1Hz to 10Hz Output Noise Filtering =1 Zero at 0.1Hz 2 Poles at 10Hz Output Settling Time (Sinking) VOUT 400µV/DIV AC-COUPLED 5µV/DIV –10mA LOAD STEP 2µs/DIV 1027LS8 G12 1sec/DIV 1027LS8 G13 1027ls8f For more information www.linear.com/LT1027LS8 5 LT1027LS8 Pin Functions NR (Pin 1): Noise Reduction Pin. Add a capacitor to reduce wideband noise. See the Applications Information section for details. VOUT (Pin 2): Output Voltage. See the Applications Information section for details regarding DC and capacitive loading and stability. VTRIM (Pin 3): Allows adjustment of output voltage. See the Applications Information section for details. GND (Pin 4): Device Ground. See the Applications Information section for recommended connection methods. NC (Pins 5, 6, 7): Connected internally, do not connect. VIN (Pin 8): Power Supply. Bypass with 0.1µF (or larger) capacitor to ground. Block Diagram VIN VOUT NR VTRIM 1027LS8 BD GND 6 OUTPUT CURRENT LIMIT AND BIAS CIRCUITS NOT SHOWN 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Applications Information Noise Reduction A large portion of the temperature drift error budget in many systems is the system reference voltage. Figure 1 indicates the maximum temperature coefficient allowable if the reference is to contribute no more than 0.5LSB error to the overall system performance. The example shown is a 12-bit system designed to operate over a temperature range from 25°C to 65°C. Assuming the system calibration is performed at 25°C, the temperature span is 40°C. It can be seen from the graph that the temperature coefficient of the reference must be no worse than 6ppm/°C if it is to contribute less than 1LSB error. For this reason, the LT1027LS8 has been optimized for low drift. The positive input of the internal scaling amplifier is brought out as the Noise Reduction (NR) pin. Connecting a 1µF Mylar capacitor between this pin and ground will reduce the wideband noise of the LT1027LS8 from 2.0µVRMS to approximately 1.2µVRMS in a 10Hz to 1kHz bandwidth. Transient response is not affected by this capacitor. Start-up settling time will increase to several milliseconds due to the 7kΩ impedance looking into the NR pin. The capacitor must be a low leakage type. Electrolytics are not suitable for this application. Just 100nA leakage current will result in a 150ppm error in output voltage. This pin is the most sensitive pin on the device. For maximum protection a guard ring is recommended. The ring should be driven from a resistive divider from VOUT set to 4.4V (the opencircuit voltage on the NR pin). MAXIMUM TEMPERATURE COEFFICIENT FOR 0.5LSB ERROR (ppm/°C) Effect of Reference Drift on System Accuracy 100 8-BIT Transient Response 10-BIT 10 12-BIT 14-BIT 1.0 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE SPAN (°C) 1027LS8 F01 Figure 1. Maximum Allowable Reference Drift The LT1027LS8 has been optimized for transient response. Settling time is under 2µs when an AC-coupled 10mA load transient is applied to the output. The LT1027LS8 achieves fast settling by using a class B NPN/PNP output stage. When sinking current, the device may oscillate with capacitive loads greater than 100pF. The LT1027LS8 is stable with all capacitive loads when at no DC load or when sourcing current, although for best settling time either no output bypass capactor or a 4.7µF tantalum unit is recommended. An 0.1µF ceramic output capacitor will maximize output ringing and is not recommended. Trimming Output Voltage Kelvin Connections The LT1027LS8 has an adjustment pin for trimming output voltage. The impedance of the VTRIM pin is approximately 20kΩ with an open-circuit voltage of 2.5V. A ± 30mV guaranteed trim range is achievable by tying the VTRIM pin to the wiper of a 10k potentiometer connecting between the output and ground. Trimming output voltage does not affect the TC of the device. Although the LT1027LS8 does not have true force-sense capability, proper hook-up can improve line loss and ground loop problems significantly. Since the ground pin of the LT1027LS8 carries only 2mA, it can be used as a low-side sense line, greatly reducing ground loop problems on the low side of the reference. The VOUT pin should be close to the load or connected via a heavy trace as the resistance of this trace directly affects load regulation. It is important to remember that a 1.22mV drop due to trace resistance is equivalent to a 1LSB error in a 5VFS, 12-bit system. 1027ls8f For more information www.linear.com/LT1027LS8 7 LT1027LS8 Applications Information INPUT R1 91Ω 2N4403 IN LT1027LS8 INPUT IN OUT KEEP THIS LINE RESISTANCE LOW LT1027LS8 + OUT LOAD GND R2* 2.4k GND GROUND RETURN 1027LS8 F02 + LOAD 4.7µF GROUND RETURN 1027LS8 F03 *OPTIONAL–REDUCES CURRENT IN OUTPUT SENSE LEAD Figure 2. Standard Connection Long-Term Drift Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic. The only way long-term drift can be determined is to measure it over the time interval of interest. 100 80 60 40 ∆VOUT (ppm) The circuits in Figure 2 and Figure 3 illustrate proper connections to minimize errors due to ground loops and line losses. Losses in the output lead can be further reduced by adding a PNP boost transistor if load current is 5mA or higher. R2 can be added to further reduce current in the output sense load. Figure 3. Driving Higher Load Currents 20 0 –20 –40 –60 –80 –100 0 The LT1027LS8 long-term drift data was collected on 80 parts that were soldered into printed circuit boards similar to a real world application. The boards were then placed into a constant temperature oven with a TA = 35°C, their outputs were scanned regularly and measured with an 8.5 digit DVM. Typical long-term drift is illustrated in Figure 4. 8 500 1000 1500 2000 HOURS 2500 3000 1027LS8 F04 Figure 4. Long-Term Drift 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Applications Information Hysteresis 26 24 25°C to 50°C to 25°C 25°C to 0°C to 25°C 22 20 18 16 14 12 10 8 6 4 2 0 –15 –12 –9 –6 –3 0 3 6 9 12 15 DISTRIBUTION (ppm) NUMBER OF UNITS NUMBER OF UNITS Thermal hysteresis is a measure of change of output voltage as a result of temperature cycling. Figure 5, Figure 6 and Figure 7 illustrate the typical hysteresis based on data taken from the LT1027LS8. A proprietary design technique minimizes thermal hysteresis. 26 24 25°C TO 0°C TO 25°C 22 25°C TO 70°C TO 25°C 20 18 16 14 12 10 8 6 4 2 0 –15 –12 –9 –6 –3 0 3 6 9 12 15 DISTRIBUTION (ppm) 1027LS8 F05 NUMBER OF UNITS Figure 5. Thermal Hysteresis Plot, 0°C to 50°C 1027LS8 F06 Figure 6. Thermal Hysteresis Plot, 0°C to 70°C 26 24 22 25°C TO 85°C TO 25°C 20 18 16 25°C TO –40°C TO 25°C 14 12 10 8 6 4 2 0 –15 –12 –9 –6 –3 0 3 6 9 12 15 DISTRIBUTION (ppm) 1027LS8 F07 Figure 7. Thermal Hysteresis Plot, –40°C to 85°C 1027ls8f For more information www.linear.com/LT1027LS8 9 LT1027LS8 Typical Applications Humidity Sensitivity Plastic mold compounds absorb water. With changes in relative humidity, plastic packaging materials change the amount of pressure they apply to the die inside. These pressure changes can cause slight changes in the output of a voltage reference, usually on the order of 100ppm. The LS8 package is hermetic, so it is not affected by humidity, and is therefore more stable in environments where humidity may be a concern. However, PC board material may absorb water and apply mechanical stress to the LT1027LS8. Proper board materials and layout are essential. LS8 1027LS8 F08a (a) For best stability, the PC board layout is critical. Change in temperature and position of the PC board, as well as aging, can alter the mechanical stress applied to components soldered to the board. FR4 and similar materials also absorb water, causing the board to swell. Even conformal coating or potting of the board does not always eliminate this effect, though it may delay the symptoms by reducing the rate of absorption. (b) Figure 8. (a) 3-Sided PCB Tab Cutout, (b) 4-Sided PCB Cutout. Lines Represent Cuts All the Way Through the PCB 80 VOUT (PPM) AND TEMPERATURE (°C) An additional advantage of slotting the PC board is that the LT1027LS8 is thermally isolated from surrounding circuitry. This separation can help reduce thermocouple effects and improve accuracy. 1027LS8 F08b 90 VIN = 10V 70 80 60 70 HUMIDITY 50 60 40 50 30 40 20 30 TEMPERATURE 10 20 0 10 –10 –20 HUMIDITY (%) Power and ground planes should be omitted under the voltage reference IC for best stability. Figure 8a shows a tab cut through the PC board on three sides of an LT1027LS8, which significantly reduces stress on the IC, as described in Application Note 82. For even better performance, Figure 8b shows slots cut through the PC board on all four sides. The slots should be as long as possible, and the corners just large enough to accommodate routing of traces. It has been shown that for PC boards designed in this way, humidity sensitivity can be reduced to less than 35ppm for a change in relative humidity of approximately 60%. Mounting the reference near the center of the board, with slots on four sides, can further reduce the sensitivity to less than 10ppm. LS8 0 0 20 40 60 –10 80 100 120 140 160 180 200 220 TIME (HRS) 1027LS8 F09 Figure 9. Illustrates Drift of LT1027LS8 with Large Changes in Humidity. Using Proper PCB Layout Techniques Limits This Drift to a Few ppm 10 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Typical Applications 10V Reference VIN IN + OUT GND 10.00V OUTPUT LT1097 LT1027LS8 – VTRIM 5k 5k* 5k* * 0.1% METAL FILM 1027LS8 TA02 10V Reference VIN VOUT VIN LT1027LS8 OUT 1F 1F GND 8 7 11 12 LTC1043 13 14 16 17 0.01µF 1027LS8 TA03 1027ls8f For more information www.linear.com/LT1027LS8 11 LT1027LS8 Typical Applications Operating 5V Reference from 5V Supply 5V LOGIC SUPPLY CMOS LOGIC GATE** 1N914 + fIN ≥ 2kHz* C1 5µF* LT1027LS8 1N914 ≈8.5V + C2 5µF* IN OUT 5V REFERENCE GND 1027LS 8 TA04 *FOR HIGHER FREQUENCIES C1 AND C2 MAY BE DECREASED **PARALLEL GATES FOR HIGHER REFERENCE CURRENT LOADING 12 1027ls8f For more information www.linear.com/LT1027LS8 LT1027LS8 Package Description Please refer to http://www.linear.com/product/LT1027LS8#packaging/ for the most recent package drawings. LS8 Package LS8 Package 8-Pin Leadless Chip Carrier (5mm × 5mm) 8-Pin Leadless Chip Carrier (5mm × 5mm) (Reference LTC DWG # 05-08-1852 Rev B) (Reference LTC DWG # 05-08-1852 Rev B) 8 2.50 ±0.15 PACKAGE OUTLINE 7 1 0.5 2 6 2.54 ±0.15 1.4 3 1.50 ±0.15 4 0.70 ±0.05 × 8 e4 XYY ZZ ABCDEF Q12345 COMPONENT PIN “A1” 5.00 SQ ±0.15 5.80 SQ ±0.15 TRAY PIN 1 BEVEL APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 SQ ±0.15 1.45 ±0.10 0.95 ±0.10 4.20 SQ ±0.10 8 1 PIN 1 TOP MARK (SEE NOTE 5) 2 PACKAGE IN TRAY LOADING ORIENTATION 5.00 SQ ±0.15 8 R0.20 REF 2.00 REF 7 6 1 7 2 2.54 ±0.15 0.5 6 4.20 ±0.10 1.4 3 5 R0.20 REF 5 3 1.00 × 7 TYP 4 LS8 0113 REV B 4 0.70 TYP NOTE: 1. ALL DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS PACKAGE DO NOT INCLUDE PLATING BURRS PLATING BURRS, IF PRESENT, SHALL NOT EXCEED 0.30mm ON ANY SIDE 4. PLATING—ELECTO NICKEL MIN 1.25UM, ELECTRO GOLD MIN 0.30UM 5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.10 TYP 0.64 × 8 TYP 1027ls8f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of itsinformation circuits as described herein will not infringe on existing patent rights. For more www.linear.com/LT1027LS8 13 LT1027LS8 Typical Application Precision Temperature Sensor VREF 5V RREF 400Ω VDD CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 COM 5k RTD THERMOCOUPLE OUT LT1027LS8 VREF MUXOUTN – + 50Ω ADCINN 7.5V –2.5V MUXOUTP 2.5k ADCINP 0.1µF LTC2449 1nF 0.01µF 50Ω SDI SCK SDO CS SPI INTERFACE LTC6241 7.5V – + –2.5V BUSY EXT FO REF+ REF– 4.7µF GND GND GND IN 1nF GND GND GND GND GND 7.5V 2.5k 1027LS8 TA05 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1021 Precision References for Series or Shunt Operation in Hermetic TO-5, SOP-8, DIP-8 Package 0.05% Max Initial Error, 5ppm/°C Max Drift, 1ppm Peak-to-Peak Noise (0.1Hz to 10Hz), –55°C to 125°C (TO-5) LT1236 Low Drift, Low Noise, 5V and 10V Voltage Reference in SO8, DIP8 and LS8 Packages 0.05% Max Initial Error, 5ppm/°C Max Drift, 1ppm Peak-to-Peak Noise (0.1Hz to 10Hz), –40°C to 85°C LT1236LS8 Precision Series Reference, 0.05%, 5ppm/°C Drift Low Profile Hermetic LS8 Package LTC®6652 High Precision, Buffered Voltage Reference Family in MSOP8 and LS8 Package 0.05% Max Initial Error, 5ppm/°C Max Drift, Shutdown Current <2µA, –40°C to 125°C Operation LT6654 Precision, Low Noise, High Output Drive Voltage Reference 1.6ppm Peak-to-Peak Noise (0.1Hz to 10Hz) Sink/Source ±10mA, 5ppm/°C Family in MSOP8 and LS8 Package Max Drift, –40°C to 125°C Operation LTC6655 Exceptional Low Noise, High Precision Reference in MSOP8 and LS8 Package 14 Linear Technology Corporation 0.25ppm Peak-to-Peak Noise (0.1Hz to 10Hz), 2ppm/°C Maximum Drift, 0.025% Maximum Initial Error, –40°C to 125°C Operation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1027LS8 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT1027LS8 1027ls8f LT 0216 • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2016