ISL60007 ® Data Sheet May 5, 2005 Precision 1.25V and 2.50V, 1.08µ-Watt, High Precision FGA™ Voltage References The ISL60007 FGA™ voltage references are extremely low power, very high precision analog voltage references fabricated in Intersil's proprietary Floating Gate Analog technology. The ISL60007 features low supply voltage operation at ultra-low 400nA operating current resulting in typical 1.08µW power consumption. In addition, the ISL60007 family features guaranteed initial accuracy as low as ±0.5mV, temperature coefficients as tight as 3ppm/°C and long-term stability of 10ppm/√1kHrs. Features • Reference Voltage . . . . . . . . . . . . . . . . . 1.25V, and 2.50V • Absolute Initial Accuracy Options. . . . . ±0.5mV, & ±1.0mV • 1.08µW typical Power Consumption • Supply Voltage Range . . . . . . . . . . . . . . . . . . 2.7V to 5.5V • Ultra-Low Supply Current. . . . . . . . . . . . . . . . . . . . .400nA • Low Temperature Coefficient Options . . . . . . . . . 3ppm/°C 5ppm/°C, & 10ppm/°C • Long Term Stability. . . . . . . . . . . . . . . . . . . 10ppm/√1kHrs The initial accuracy and thermal stability performance of the ISL60007 family plus the low power consumption eliminates the need to compromise accuracy and thermal stability for reduced power consumption making it an ideal high resolution, low power data conversion system. • 7mA Source & Sink Current Ordering Information Applications TEMP. PART NUMBER RANGE (°C) PACKAGE GRADE VOUT OPTION ISL60007CIB812 -40 to +85 8 Ld SOIC ±0.5mV, 5ppm/°C ISL60007DIB812 -40 to +85 8 Ld SOIC ±1.0mV, 1.250V 10ppm/°C ISL60007BIB825 -40 to +85 8 Ld SOIC ±0.5mV, 3ppm/°C 2.500V ISL60007CIB825 -40 to +85 8 Ld SOIC ±0.5mV, 5ppm/°C 2.500V ISL60007DIB825 -40 to +85 8 Ld SOIC ±1.0mV, 10ppm/°C 2.500V Pinout ISL60007 (8 LD SOIC) TOP VIEW 1.250V • ESD Protection. . . . . . . . . . . . . 5kV (Human Body Model) • Standard 8 Ld SOIC Packaging • Temperature Range . . . . . . . . . . . . . . . . . . -40°C to +85°C • High Resolution A/Ds & D/As • Digital Meters • Bar Code Scanners • Mobile Communications • PDA’s and Notebooks • Battery Management Systems • Medical Systems Typical Application VIN = +3.0V 0.1µF VIN GND 1 8 DNC VIN 2 7 DNC DNC 3 6 VOUT GND 4 5 DNC PIN NAME GND VIN DESCRIPTION 10µF VOUT 0.001µF* ISL60007 GND REF IN SERIAL BUS Pin Descriptions FN8087.1 ENABLE SCK SDAT 16 TO 24-BIT A/D CONVERTER Ground Connection Power Supply Input Connection VOUT Voltage Reference Output Connection DNC Do Not Connect; Internal Connection Must Be Left Floating 1 *Also see Figure 29 in Applications Information. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2004-2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL60007 Absolute Maximum Ratings Recommended Operating Conditions Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +125°C Max Voltage VIN to Gnd. . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.5V Max Voltage VOUT to Gnd (10s) . . . . . . . . . . . . . . . -0.5V to +3.50V Voltage on “DNC” pins . . . . No connections permitted to these pins. Lead Temperature, soldering (10s) . . . . . . . . . . . . . . . . . . . . +225°C Temperature Range (Industrial) . . . . . . . . . . . . . . . . . . -40°C to 85°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Electrical Specifications SYMBOL Operating Conditions: VIN = 3.0V, IOUT = 0mA, COUT = 0.001µF, TA = -40 to +85°C, Unless Otherwise Specified. PARAMETER CONDITIONS MIN TYP MAX UNITS 1.250V OUTPUT VOLTAGE VOUT VOA Output Voltage 1.250 ISL60007C12 -0.5 +0.5 mV ISL60007D12 -1.0 +1.0 mV ISL60007C12 5 ppm/°C ISL60007D12 10 ppm/°C 5.5 V 400 800 nA +2.7V ≤ VIN ≤ +5.5V 30 200 µV/V Sourcing: 0mA ≤ IOUT ≤ 7mA 15 50 µV/mA Sinking: -7mA ≤ IOUT ≤ 0mA 50 150 µV/mA Long Term Stability TA = 25°C 10 ppm/√1kHrs ∆VOUT/∆TA Thermal Hysteresis (Note 2) ∆TA = 125°C 50 ppm ISC Short Circuit Current (Note 3) TA = 25°C 40 VN VOUT Noise 0.1Hz ≤ f ≤ 10Hz 30 µVP-P 2.500 V TC VOUT VOUT Accuracy @ TA = 25°C V Output Voltage Temperature Coefficient (Note 1) VIN Input Voltage Range IIN Supply Current ∆VOUT/∆VIN Line Regulation ∆VOUT/∆IOUT Load Regulation ∆VOUT/∆t 2.7 80 mA 2.500V OUTPUT VOLTAGE VOUT VOA TC VOUT Output Voltage VOUT Accuracy @ TA = 25°C Output Voltage Temperature Coefficient (Note 1) VIN Input Voltage Range IIN Supply Current ∆VOUT/∆VIN Line Regulation ∆VOUT/∆IOUT Load Regulation ISL60007B25 -0.5 +0.5 mV ISL60007C25 -0.5 +0.5 mV ISL60007D25 -1.0 +1.0 mV ISL60007B25 3 ppm/°C ISL60007C25 5 ppm/°C ISL60007D25 10 ppm/°C 5.5 V 400 800 nA +2.7V ≤ VIN ≤ +5.5V 30 200 µV/V Sourcing: 0mA ≤ IOUT ≤ 7mA 15 50 µV/mA Sinking: -7mA ≤ IOUT ≤ 0mA 50 150 µV/mA 2.7 ∆VOUT/∆t Long Term Stability (Note 4) TA = 25°C 10 ppm/√1kHrs ∆VOUT/∆TA Thermal Hysteresis (Note 2) ∆TA = 125°C 50 ppm 2 FN8087.1 May 5, 2005 ISL60007 Electrical Specifications SYMBOL Operating Conditions: VIN = 3.0V, IOUT = 0mA, COUT = 0.001µF, TA = -40 to +85°C, Unless Otherwise Specified. (Continued) PARAMETER CONDITIONS MIN TYP MAX UNITS 80 mA ISC Short Circuit Current (Note 3) TA = 25°C, VOUT tied to Gnd 40 VN Output Voltage Noise 0.1Hz ≤ f ≤ 10Hz 30 µVp-p NOTES: 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 measured @ TA = 25°C after temperature cycling over a specified range, ∆TA. VOUT is read initially at TA = 25°C for the device under test. The device is temperature cycled and a second VOUT measurement is taken at 25°C. The difference between the initial VOUT reading and the second VOUT reading is then expressed in ppm. For ∆TA = 125°C, the device under test is cycled from +25°C to +85°C to -40°C to +25°C. 3. Guaranteed by device characterization and/or correlation to other device tests. 4. FGA voltage reference long term drift is a logarithmic characteristic. Changes that occur after the first few hundred hours of operation are significantly smaller with time, asymptotically approaching zero beyond 1000 hours. Because of this decreasing characteristic, long term drift is specified in ppm/√1kHrs. Typical Performance Curves, 1.25V Reference VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified 600 400 500 +85°C 440nA 400 IIN (nA) IIN (nA) 350 330nA 300 +25°C 300 200 100 2.7 240nA 3.4 4.1 VIN (V) 4.8 FIGURE 1. IIN vs VIN - 3 UNITS 3 5.5 250 2.7 -40°C 3.4 4.1 VIN (V) 4.8 5.5 FIGURE 2. IIN vs VIN - 3 TEMPS FN8087.1 May 5, 2005 ISL60007 Typical Performance Curves, 1.25V Reference 1.2506 1.2504 VOUT (V) 1.2502 1.25 UNIT 1 1.2498 1.2496 UNIT 2 1.2494 1.2492 1.249 -40 1.25006 VOUT (V) (NORMALIZED TO 1.25V AT VIN =3V) 1.2508 VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified (Continued) UNIT 3 -15 10 35 TEMPERATURE (°C) 60 1.25005 240nA 1.25004 1.25003 1.25002 330nA 1.25001 1.25 1.24999 1.24998 440nA 1.24997 1.24996 2.7 85 FIGURE 3. VOUT vs TEMPERATURE NORMALIZED TO 25°C 3.4 4.1 VIN (V) 5.5 FIGURE 4. LINE REGULATION - 3 UNITS 50 ∆VIN = +0.3V +85°C 25 +25°C 0 -40°C 50mV/DIV DELTA VOUT (µV) (NORMALIZED TO VIN = 3.0V) 4.8 ∆VIN = -0.3V -25 -50 2.7 3.4 4.1 4.8 5.5 VIN 500µs/DIV FIGURE 5. LINE REGULATION - 3 TEMPS FIGURE 6. LINE TRANSIENT RESPONSE, CL = 0nF 0 ∆VIN = +0.3V -10 -20 50mV/DIV PSRR (dB) -30 ∆VIN = -0.3V CL = 0nF -40 CL = 1nF -50 CL = 10nF -60 CL = 100nF -70 -80 -90 -100 500µs/DIV FIGURE 7. LINE TRANSIENT RESPONSE, CL = 1nF 4 1 10 100 1000 10000 FREQUENCY (Hz) 100000 1000000 FIGURE 8. PSRR vs f vs CL FN8087.1 May 5, 2005 ISL60007 Typical Performance Curves, 1.25V Reference VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified (Continued) 0.40 +85°C 0.30 IL= +50µA 0.10 50mV/DIV DELTA V (mV) 0.20 +25°C -40°C 0.00 -0.10 -0.20 -7 IL= -50µA -6 -5 -4 SINKING -3 -2 -1 0 1 2 3 OUTPUT CURRENT (mA) 4 5 6 SOURCING 7 200µs/DIV FIGURE 9. LOAD REGULATION vs TEMP FIGURE 10. LOAD TRANSIENT RESPONSE @ IL=50µA, CL=1nF 3.5 VIN 3 200mV/DIV VIN AND VOUT (V) IL= +7mA 2.5 2 1.5 1 VOUT 0.5 IL= -7mA 0 0 2 4 500µs/DIV FIGURE 11. LOAD TRANSIENT RESPONSE @ IL=7mA, CL=1nF Typical Performance Curves, 2.5V Reference 6 TIME (ms) 8 10 12 FIGURE 12. TURN-ON TIME @ TA = 25°C VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified 800 500 700 600 450 570nA 400 300 IIN (nA) IIN (nA) +85°C 500 400nA 400 +25°C -40°C 250nA 350 200 100 2.7 3.4 4.1 4.8 VIN (V) FIGURE 13. IIN vs VIN - 3 UNITS 5 5.5 300 2.7 3.4 4.1 4.8 5.5 VIN (V) FIGURE 14. IIN vs VIN - 3 TEMPS FN8087.1 May 5, 2005 ISL60007 Typical Performance Curves, 2.5V Reference VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified (Continued) 2.50030 2.5008 NORMALIZED TO 2.50V AT VIN = 3V NORMALIZED TO +25°C 2.5006 UNIT 2 2.5004 2.50020 UNIT 2 UNIT 1 UNIT 3 VOUT (V) VOUT (V) 2.5002 2.5 2.4998 UNIT 3 2.50010 UNIT 1 2.50000 2.4996 2.49990 2.4994 2.4992 -40 -15 10 35 TEMPERATURE (°C) 60 2.49980 2.7 85 3.4 4.1 FIGURE 15. VOUT vs TEMP - 3 UNITS 5.5 FIGURE 16. LINE REGULATION - 3 UNITS 200 ∆VIN = +0.3V NORMALIZED TO VIN = 3V 150 -40°C +25°C 100 +85°C 50 0 100mV/DIV DELTA VOUT (V) (µV) 4.8 VIN (V) ∆VIN = -0.3V -50 -100 2.7 3.4 4.1 VIN 4.8 5.5 1ms/DIV FIGURE 17. LINE REGULATION - 3 TEMPS FIGURE 18. LINE TRANSIENT RESPONSE, CL = 0nF 0 ∆VIN = +0.3V NO LOAD -10 1nF LOAD -20 PSRR (dB) 100mV/DIV -30 ∆VIN = -0.3V -40 100nF LOAD -50 10nF LOAD -60 -70 -80 -90 -100 1 1ms/DIV FIGURE 19. LINE TRANSIENT RESPONSE, CL = 1nF 6 10 100 1000 10000 100000 1000000 FREQUENCY (Hz) FIGURE 20. PSRR vs f vs CL FN8087.1 May 5, 2005 ISL60007 Typical Performance Curves, 2.5V Reference VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified (Continued) 0.30 IL= +50µA +85°C 0.10 +25°C 50mV/DIV DELTA VOUT (mV) 0.20 -40°C 0.00 -0.10 -0.20 IL= -50µA -0.30 -7 -6 -5 -4 SINKING -3 -2 -1 0 1 2 3 4 5 6 7 SOURCING 100µs/DIV OUTPUT CURRENT FIGURE 21. LOAD REGULATION vs TEMP FIGURE 22. LOAD TRANSIENT RESPONSE @ IL=50µA, CL=1nF 3.5 3 IL= +7mA VIN 200mV/DIV VIN & VOUT (V) 2.5 VOUT 2 1.5 1 0.5 IL= -7mA 0 500µs/DIV 0 2 4 6 8 10 12 TIME (ms) FIGURE 23. LOAD TRANSIENT RESPONSE @ IL=7mA, CL=1nF 140 FIGURE 24. TURN-ON TIME @ TA = 25°C 1nF LOAD 120 100nF LOAD NO LOAD 10nF LOAD 80 10µV/DIV ZOUT (Ω) 100 60 40 20 0 1 10 100 1000 FREQUENCY (Hz) FIGURE 25. ZOUT vs f vs CL 7 10000 100000 10s/DIV FIGURE 26. VOUT NOISE FN8087.1 May 5, 2005 ISL60007 Applications Information VIN = +3.0V 10µF FGA Technology The ISL60007 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 ISL60007 is the first high precision voltage reference with ultra low power consumption that makes it possible to leave power on continuously in battery operated circuits. The ISL60007 consumes extremely low supply current due to the proprietary FGA technology. Supply current at room temperature is typically 400nA 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 27. 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. 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. 8 VIN 0.01µF VOUT ISL60007 GND 0.001µF-0.01µF REF IN SERIAL BUS ENABLE SCK SDAT 12 TO 24-BIT A/D CONVERTER FIGURE 27. 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 high-pass filter with a corner frequency at 0.1Hz 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 Figure 28. These noise measurements are made with a 2 decade bandpass filter made of a 1 pole highpass 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 28 also shows the noise in the 10kHz to 1MHz band can be reduced to about 50µVP-P using a 0.001µF 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 0.001µF the noise reduction network shown in Figure 29 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Figure 28, noise is reduced to less than 40µVP-P from 1Hz to 1MHz using this network with a 0.01µF capacitor and a 2kΩ resistor in series with a 10µF capacitor. FN8087.1 May 5, 2005 ISL60007 current. Normal turn-on time is typically 4ms. This is shown in Figure 30. Since devices can vary in supply current down to 250nA, turn-on time can last up to about 6ms. Care should be taken in system design to include this delay before measurements or conversions are started. 400 300 CL = 0 CL = 0.01µF & 10µF + 2kΩ 250 3.5 200 CL = 0.1µF 150 CL= 0.001µF 100 50 0 1 10 100 1000 10000 VIN 3 100000 FIGURE 28. NOISE REDUCTION VIN AND VOUT (V) NOISE VOLTAGE (µVP-P) 350 400nA 2.5 570nA 2 250nA 1.5 1 0.5 0 VIN = 3.0V 0 2 4 6 8 10 12 TIME (ms) 10µF 0.1µF VIN ISL60007 FIGURE 30. TURN-ON TIME (+25°C) VO GND 2kΩ 0.01µF 10µF FIGURE 29. Turn-On Time The ISL60007 devices operate with ultra-low supply current and thus the time to bias up internal circuitry to final values will be longer than with references that require higher Temperature Coefficient 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 specifying temperature coefficient. Typical Application Circuits VIN = 5V R = 200Ω 2N2905 VIN ISL60007 VOUT 2.5V/50mA 0.001µF GND FIGURE 31. PRECISION 2.5V, 50mA REFERENCE 9 FN8087.1 May 5, 2005 ISL60007 Typical Application Circuits (Continued) VIN = 3.0V 0.1µF 10µF VIN ISL60007 VOUT 2.5V 0.001µF GND VIN ISL60007 VOUT 2.5V-|VIN| R1 = -(IOUT) ; IOUT ≤ 7mA 0.001µF GND R1 -VIN = -3.0V -2.5V FIGURE 32. ±2.5V DUAL OUTPUT, HIGH ACCURACY REFERENCE VIN = 3.0V 0.1µF 10µF VIN VOUT + EL8178 – ISL60007 VOUT SENSE LOAD GND FIGURE 33. KELVIN SENSED LOAD ISL60007 VOUT VIN GND CIN 0.001 COUT = 0.001µF -2.5V R1 = 200Ω R1 LIMITS MAX LOAD CURRENT with R1 = 200Ω; ILOAD MAX = 2.5mA R1 = -3.0V 2.5V-|VIN| -(IOUT) ; IOUT ≤ 7mA FIGURE 34. NEGATIVE VOLTAGE REFERENCE 10 FN8087.1 May 5, 2005 ISL60007 Typical Application Circuits (Continued) 2.7-5.5V 0.1µF 10µF VIN VOUT ISL60007 GND 0.001µF VCC RH VOUT X9119 2-WIRE BUS + SDA EL8178 SCL VSS – VOUT (BUFFERED) RL FIGURE 35. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE 11 FN8087.1 May 5, 2005 ISL60007 Packaging Information 8-Lead Plastic, SOIC, Package Code B8 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) FOOTPRINT 0.030" Typical 8 Places NOTE: All dimensions in inches (in parentheses in millimeters). All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 12 FN8087.1 May 5, 2005