® X60008E-41 Precision 4.096V FGA™ Voltage Reference FEATURES DESCRIPTION • Output Voltage: 4.096V The X60008-41 FGA™ voltage references are very high precision analog voltage references fabricated in Intersil’s proprietary Floating Gate Analog technology, which achieves superior levels of performance when compared to conventional band gap, buried zener, or XFET™ technologies. • Absolute Initial Accuracy: ±5.0mV • Ultra Low Power Supply Current: 500nA • Low Temperature Coefficient: 20ppm/°C • 10 mA Source & Sink Current Capability • 10 ppm/1000hrs Long Term Stability FGA™ voltage references feature very high initial accuracy, very low temperature coefficient, excellent long term stability, low noise and excellent line and load regulation, at the lowest power consumption currently available. These voltage references enable advanced applications for precision industrial & portable systems operating at significantly higher accuracy and lower power levels than can be achieved with conventional technologies. • Supply Voltage Range: 4.5V to 9.0V • 5kV ESD (Human Body Model) • Standard Package: SOIC-8 • Temp Range: -40°C to +85°C APPLICATIONS • High Resolution A/Ds & D/As • Precision Current Sources • Smart sensors • Digital Meters • Precision Regulators • Strain Gage Bridges • Calibration Systems • Precision Oscillators • Threshold Detectors • V-F Converters • Battery Management Systems • Servo Systems TYPICAL APPLICATION VIN = +5.0V 0.1µF 10µF VIN VOUT X60008-41 0.001µF(*) GND REF IN Serial Bus Enable SCK SDAT 16 to 24-bit A/D Converter * ( )Also REV 1.3 6/9/04 www.intersil.com see Figure 3 in Applications Information 1 of 10 X60008E-41 PACKAGE DIAGRAM X60008-XX SOIC 1 8 DNC VIN 2 7 DNC DNC 3 6 VOUT 4 5 DNC GND GND PIN CONFIGURATIONS Pin Name GND VIN Description Ground Connection Power Supply Input Connection VOUT Voltage Reference Output Connection DNC Do Not Connect; Internal Connection – Must Be Left Floating ORDERING INFORMATION X 60008 X I S8 – 41 Logo REV 1.3 6/9/04 Device Part Number 60008 = Standard Grade E = ±5.0 mV, 20 ppm/°C Temperature Range I = -40°C to +85°C Package S8 = 8 lead SOIC VOUT Option 41 = 4.096V www.intersil.com 2 of 10 X60008E-41 ABSOLUTE MAXIMUM RATINGS COMMENT Storage Temperature Range ........... – 65°C to + 125°C Max Voltage Applied VIN to Gnd .......... – 0.5V to +9.0V Max Voltage Applied VOUT to Gnd (*)................................. – 0.5V to +5.1V Voltage on “DNC” pins ......................... No connections permitted to these pins. Lead Temperature, soldering (*) ...................... + 225°C Absolute Maximum Ratings are limits which may result in impaired reliability and/or permanent damage to the device. These are stress ratings provided for information only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. (*) note: maximum duration = 10 seconds For guaranteed specifications and test conditions, see Electrical Characteristics. RECOMMENDED OPERATING CONDITIONS Temperature Min. Max. Industrial –40°C +85°C The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. ELECTRICAL CHARACTERISTICS (Operating Conditions: VIN = 5.0V, IOUT = 0mA, COUT = 0.001µF, TA = -40 to +85°C unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Units +5.0 mV 900 nA 9.0 V 20 ppm/°C VOUT Output Voltage VOA VOUT Accuracy X60008E-41 4.096 IIN Supply Current VIN Input Voltage Range TC VOUT Output Voltage Temperature Coefficient(1) ∆VOUT/∆VIN Line Regulation +4.5V ≤ VIN ≤ +8.0V ∆VOUT/∆IOUT Load Regulation 0mA ≤ ISOURCE ≤ 10mA -10mA ≤ ISINK ≤ 0mA 10 20 ∆VOUT/∆t Long Term Stability TA = 25°C 10 ppm/ 1000Hrs ∆VOUT/∆TA Thermal Hysteresis(2) ∆T = -40°C to +85°C 100 ppm TA = 25°C 50 0.1Hz to 10Hz 30 -5.0 500 (3) ISC Short Circuit Current VN Output Voltage Noise Note: TA = 25°C 4.5 X60008E-41 V 150 µV/V 50 100 µV/mA 80 mA µVpp 1. Over the specified temperature range. Temperature coefficient is measured by the box method whereby the change in VOUT is divided by the temperature range; in this case, -40°C to +85°C = 125°C. 2. Thermal Hysteresis is the change in VOUT created by package stress @ TA = 25°C after temperature cycling. VOUT is read initially at TA = 25°C; the X60008 is then cycled between Hot (85°C) and Cold (-40°C) before a second VOUT measurement is taken at 25°C. The deviation between the initial VOUT reading and the second VOUT reading is then expressed in ppm. 3. Guaranteed by Device Characterization REV 1.3 6/9/04 www.intersil.com 3 of 10 X60008E-41 TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25°C unless otherwise specified) LINE REGULATION (3 Representative Units) LINE REGULATION 300 4.0963 Unit 2, IIN = 520nA DELTA VOUT (µV) (normailized to VIN = 5.0V) 250 VOUT (V) (normailized to 4.096V at VIN = 5.0V) -40°C +25°C 200 150 +85°C 100 50 0 -50 -100 4.5 5 5.5 6.0 6.5 7.0 7.5 8.0 8.5 4.09625 Unit 3, IIN = 700nA 4.0962 4.09615 4.0961 Unit 1, IIN = 360nA 4.09605 4.096 4.09595 4.0959 9.0 4.5 VIN (V) 5.5 6.5 7.5 8.5 VIN (V) 0.1Hz to 10Hz VOUT NOISE Band Pass Filter with 1 zero at .1Hz and 2 poles at 10 Hz LOAD REGULATION 0.6 0.4 0.3 +25°C +85°C 0.2 10µV/div DELTA VOUT (mV) 0.5 -40°C 0.1 0.0 -0.1 -20 -15 -10 -5 0 5 SINKING 10 15 20 1 Sec/div SOURCING OUTPUT CURRENT (mA) REV 1.3 6/9/04 www.intersil.com 4 of 10 X60008E-41 TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25°C unless otherwise specified) 50µA LOAD TRANSIENT RESPONSE 10mA LOAD TRANSIENT RESPONSE CL = .001µF 100mV/DIV 500mV/DIV CL = .001µF IL = -10mA IL = +10mA IL = -50µA IL = +50µA 2mS/DIV 500µSEC/DIV LINE TRANSIENT RESPONSE LINE TRANSIENT RESPONSE 200mV/DIV CL = .001µF 200mV/DIV CL = 0 ∆VIN = -500mV ∆VIN = +500mV 500µSEC/DIV REV 1.3 6/9/04 ∆VIN = -500mV ∆VIN = +500mV 500µSEC/DIV www.intersil.com 5 of 10 X60008E-41 TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25°C unless otherwise specified) PSRR vs CAP Load 0 VOUT vs TEMPERATURE Normalized to 25°C (3 Representative Units) 4.0996 1nF Load -20 4.0984 -30 Unit 3, IIN = 700nA PSRR (dB) Unit 2, IIN = 520nA 4.0972 4.096 VOUT (V) No Load -10 Unit 1, IIN = 360nA 4.0948 10nF Load -40 -50 -60 100nF Load 4.0936 -70 4.0924 -80 4.0912 -90 -100 4.09 -40 -15 10 35 1 85 60 01 100 1000 TEMPERATURE (°C) 10000 100000 1000000 FREQUENCY (Hz) ZOUT vs FREQUENCY IIN vs VIN 350 800 300 25°C 600 1nF Load 85°C 500 200 I IN (nA) ZOUT (Ω) 250 -40°C 700 no Load 10nF Load 150 400 300 100 200 50 100 100nF Load 0 0 1 10 100 1000 10000 4.5 100000 5 5.5 6 IIN vs VIN (3 Representative Units) 1000 6.5 7 7.5 8 8.5 9 VIN (V) FREQUENCY (Hz) 900 TURN-ON TIME 6 Unit 3 VIN 5 800 VOUT VIN & VOUT (V) 700 Unit 2 I IN (nA) 600 500 Unit 1 400 4 3 2 300 200 1 100 0 0 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 -1 REV 1.3 6/9/04 1 3 5 7 9 11 TIME (mSec) VIN (V) www.intersil.com 6 of 10 X60008E-41 APPLICATIONS INFORMATION FGA Technology The X60008 series of voltage references use the floating gate technology to create references with very low drift and supply current. Essentially the charge stored on a floating gate cell is set precisely in manufacturing. The reference voltage output itself is a buffered version of the floating gate voltage. The resulting reference device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. Also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). The process used for these reference devices is a floating gate CMOS process, and the amplifier circuitry uses CMOS transistors for amplifier and output transistor circuitry. While providing excellent accuracy, there are limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections. Nanopower Operation Reference devices achieve their highest accuracy when powered up continuously, and after initial stabilization has taken place. This drift can be eliminated by leaving the power on continuously. The X60008 is the first high precision voltage reference with ultra low power consumption that makes it practical to leave power on continuously in battery operated circuits. The X60008 consumes extremely low supply current due to the proprietary FGA technology. Supply current at room temperature is typically 500nA which is 1 to 2 orders of magnitude lower than competitive devices. Application circuits using battery power will benefit greatly from having an accurate, stable reference which essentially presents no load to the battery. In particular, battery powered data converter circuits that would normally require the entire circuit to be disabled when not in use can remain powered up between conversions as shown in Figure 1. Data acquisition circuits providing 12 to 24 bits of accuracy can operate with the reference device continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. REV 1.3 6/9/04 Other reference devices consuming higher supply currents will need to be disabled in between conversions to conserve battery capacity. Absolute accuracy will suffer as the device is biased and requires time to settle to its final value, or, may not actually settle to a final value as power on time may be short. Figure 1. VIN = 4.5–9V 10µF 0.01µF VIN VOUT X60008-41 GND 0.001µF REF IN Serial Bus Enable SCK SDAT 12 to 24-bit A/D Converter Board mounting Considerations For applications requiring the highest accuracy, board mounting location should be reviewed. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Obviously mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy. Noise Performance and Reduction: The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 30µVp-p. This is shown in the plot in the Typical Performance Curves. The noise measurement is made with a bandpass filter made of a 1 pole highpass filter with a corner frequency at .1Hz and a 2-pole low-pass filter with a corner frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in the 10KHz to 1MHz bandwidth is approximately 400µVp-p with no capacitance on the output, as shown in Fig. 2 below. These noise measurements are made with a 2 decade bandpass filter made of a 1 pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10 times the center frequency. Figure 2 also shows the noise in the 10KHz to 1MHz band can www.intersil.com 7 of 10 X60008E-41 be reduced to about 50µVp-p using a .001µF capacitor on the output. Noise in the 1KHz to 100KHz band can be further reduced using a 0.1µF capacitor on the output, but noise in the 1Hz to 100Hz band increases due to instability of the very low power amplifier with a 0.1µF capacitance load. For load capacitances above .001µF the noise reduction network shown in Fig. 3 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Fig. 2, noise is reduced to less than 40µVp-p from 1Hz to 1MHz using this network with a .01µF capacitor and a 2Kohm resistor in series with a 10µF capacitor. Turn-On Time The X60008 devices have ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with higher power references. Normal turn-on time is typically 7ms. This is shown in the graph, Figure 4. Since devices can vary in supply current down to 300nA, turn-on time can last up to about 12ms. Care should be taken in system design to include this delay before measurements or conversions are started. Figure 4. X60008 TURN-ON TIME (25°C) (3 Representative Units) Figure 2. 6 X60008-41 NOISE REDUCTION 400 CL = .001µF VIN & VOUT (V) NOISE VOLTAGE (µVp-p) 350 CL = .1µF 300 VIN 5 CL = 0 CL = .01µF & 10µF + 2kohm 250 200 150 4 IIN = 700nA IIN = 520nA 3 IIN = 360nA 2 1 100 0 -1 50 1 3 5 7 9 11 TIME (mSec) 0 1 10 100 1000 10000 100000 Temperature Coefficient Figure 3. VIN = 5.0V 10µF .1µF VIN VO X60008-41 GND 2KΩ .01µF 10µF REV 1.3 6/9/04 The limits stated for temperature coefficient (tempco) are governed by the method of measurement. The overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures, take the total variation, (VHIGH – VLOW), and divide by the temperature extremes of measurement (THIGH – TLOW). The result is divided by the nominal reference voltage (at T=25°C) and multiplied by 106 to yield ppm/°C. This is the “Box” method for determining temperature coefficient. www.intersil.com 8 of 10 X60008E-41 TYPICAL APPLICATION CIRCUITS Precision 4.096V, 50mA Reference. VIN = 5.2V to 9V R = 200Ω 2N2905 VIN X60008-41 VOUT 4.096V/50mA 0.001µF GND Kelvin Sensed Load 4.5V to 9V 0.1µF VIN VOUT + X60008-41 VOUT Sense – Load GND 4.096V Full Scale Low-Drift 10-bit Adjustable Voltage Source 4.5V to 9V 0.1µF VIN VOUT X60008-41 GND 0.001µF VCC RH X9119 2-Wire Bus + SDA SCL – VSS REV 1.3 6/9/04 VOUT VOUT (buffered) RL www.intersil.com 9 of 10 X60008E-41 PACKAGING INFORMATION 8-Lead Plastic, SOIC, Package Code S8 0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 0.244 (6.20) Pin 1 Index Pin 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7° 0.053 (1.35) 0.069 (1.75) 0.004 (0.19) 0.010 (0.25) 0.050 (1.27) 0.010 (0.25) X 45° 0.020 (0.50) 0.050" Typical 0.050" Typical 0° - 8° 0.0075 (0.19) 0.010 (0.25) 0.250" 0.016 (0.410) 0.037 (0.937) 0.030" Typical 8 Places FOOTPRINT NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) LIMITED WARRANTY ©Intersil, Inc. 2004 Patents Pending Devices sold by Intersil, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Intersil, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Intersil, Inc. makes no warranty of merchantability or fitness for any purpose. Intersil, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Intersil, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Intersil, Inc. product. No other circuits, patents, or licenses are implied. TRADEMARK DISCLAIMER: Intersil and the Intersil logo are registered trademarks of Intersil, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, BiasLock and XDCP are also trademarks of Intersil, Inc. All others belong to their respective owners. U.S. PATENTS Intersil products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurrence. Intersil’s products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life REV 1.3 6/9/04 www.intersil.com Characteristics subject to change without notice. 10 of 10