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ISL60007
Data Sheet May 5, 2005 FN8087.1
Precision 1.25V and 2.50V, 1.08-Watt, High Precision FGATM Voltage References
The ISL60007 FGATM 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 1.08W 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. 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.
Features
* Reference Voltage . . . . . . . . . . . . . . . . . 1.25V, and 2.50V * Absolute Initial Accuracy Options. . . . . 0.5mV, & 1.0mV * 1.08W 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 * 7mA Source & Sink Current * ESD Protection. . . . . . . . . . . . . 5kV (Human Body Model) * Standard 8 Ld SOIC Packaging * Temperature Range . . . . . . . . . . . . . . . . . . -40C to +85C
Ordering Information
TEMP. PART NUMBER RANGE (C) PACKAGE ISL60007CIB812 ISL60007DIB812 ISL60007BIB825 ISL60007CIB825 ISL60007DIB825 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 8 Ld SOIC 8 Ld SOIC GRADE 0.5mV, 5ppm/C VOUT OPTION 1.250V
Applications
* High Resolution A/Ds & D/As * Digital Meters * Bar Code Scanners * Mobile Communications * PDA's and Notebooks * Battery Management Systems
2.500V 2.500V
1.0mV, 1.250V 10ppm/C 2.500V
8 Ld SOIC 0.5mV, 3ppm/C 8 Ld SOIC 0.5mV, 5ppm/C 8 Ld SOIC 1.0mV, 10ppm/C
* Medical Systems
Typical Application
VIN = +3.0V 0.1F VIN 10F
Pinout
ISL60007 (8 LD SOIC) TOP VIEW
GND 1 VIN 2 DNC 3 GND 4 8 7 6 5 DNC DNC VOUT DNC
VOUT
ISL60007 GND REF IN SERIAL BUS ENABLE SCK SDAT 16 TO 24-BIT A/D CONVERTER
0.001F*
Pin Descriptions
PIN NAME GND VIN VOUT DNC DESCRIPTION Ground Connection Power Supply Input Connection Voltage Reference Output Connection Do Not Connect; Internal Connection Must Be Left Floating
*Also see Figure 29 in Applications Information.
1
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
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +125C 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) . . . . . . . . . . . . . . . . . . . . +225C
Recommended Operating Conditions
Temperature Range (Industrial) . . . . . . . . . . . . . . . . . . -40C to 85C
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 = 0.001F, TA = -40 to +85C, Unless Otherwise Specified. CONDITIONS MIN TYP MAX UNITS
PARAMETER
1.250V OUTPUT VOLTAGE VOUT VOA Output Voltage VOUT Accuracy @ TA = 25C ISL60007C12 ISL60007D12 TC VOUT Output Voltage Temperature Coefficient (Note 1) Input Voltage Range Supply Current Line Regulation +2.7V VIN +5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA VOUT/t VOUT/TA ISC VN Long Term Stability Thermal Hysteresis (Note 2) Short Circuit Current (Note 3) VOUT Noise TA = 25C TA = 125C TA = 25C 0.1Hz f 10Hz ISL60007C12 ISL60007D12 2.7 400 30 15 50 10 50 40 30 80 -0.5 -1.0 1.250 +0.5 +1.0 5 10 5.5 800 200 50 150 V mV mV ppm/C ppm/C V nA V/V V/mA V/mA ppm/1kHrs ppm mA VP-P
VIN IIN VOUT/VIN
VOUT/IOUT Load Regulation
2.500V OUTPUT VOLTAGE VOUT VOA Output Voltage VOUT Accuracy @ TA = 25C ISL60007B25 ISL60007C25 ISL60007D25 TC VOUT Output Voltage Temperature Coefficient (Note 1) ISL60007B25 ISL60007C25 ISL60007D25 VIN IIN VOUT/VIN Input Voltage Range Supply Current Line Regulation +2.7V VIN +5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA VOUT/t VOUT/TA Long Term Stability (Note 4) Thermal Hysteresis (Note 2) TA = 25C TA = 125C 2.7 400 30 15 50 10 50 -0.5 -0.5 -1.0 2.500 +0.5 +0.5 +1.0 3 5 10 5.5 800 200 50 150 V mV mV mV ppm/C ppm/C ppm/C V nA V/V V/mA V/mA ppm/1kHrs ppm
VOUT/IOUT Load Regulation
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FN8087.1 May 5, 2005
ISL60007
Electrical Specifications
SYMBOL ISC VN 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, -40C to +85C = 125C. 2. Thermal Hysteresis is the change in VOUT measured @ TA = 25C after temperature cycling over a specified range, TA. VOUT is read initially at TA = 25C for the device under test. The device is temperature cycled and a second VOUT measurement is taken at 25C. The difference between the initial VOUT reading and the second VOUT reading is then expressed in ppm. For TA = 125C, the device under test is cycled from +25C to +85C to -40C to +25C. 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. Operating Conditions: VIN = 3.0V, IOUT = 0mA, COUT = 0.001F, TA = -40 to +85C, Unless Otherwise Specified. (Continued) CONDITIONS TA = 25C, VOUT tied to Gnd 0.1Hz f 10Hz MIN TYP 40 30 MAX 80 UNITS mA Vp-p
PARAMETER Short Circuit Current (Note 3) Output Voltage Noise
Typical Performance Curves, 1.25V Reference
600
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified
400
500 440nA 350 IIN (nA) 330nA 300 240nA IIN (nA) 400
+85C
+25C 300
-40C
200
100 2.7
3.4
4.1 VIN (V)
4.8
5.5
250 2.7
3.4
4.1 VIN (V)
4.8
5.5
FIGURE 1. IIN vs VIN - 3 UNITS
FIGURE 2. IIN vs VIN - 3 TEMPS
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FN8087.1 May 5, 2005
ISL60007 Typical Performance Curves, 1.25V Reference
1.2508 1.2506 1.2504 1.2502 VOUT (V) 1.25 1.2498 1.2496 1.2494 1.2492 1.249 -40 UNIT 3 UNIT 1
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
VOUT (V) (NORMALIZED TO 1.25V AT VIN =3V) 1.25006 1.25005 1.25004 1.25003 1.25002 1.25001 1.25 1.24999 1.24998 1.24997 1.24996 2.7 440nA 3.4 4.1 VIN (V) 4.8 5.5 330nA 240nA
UNIT 2
-15
10 35 TEMPERATURE (C)
60
85
FIGURE 3. VOUT vs TEMPERATURE NORMALIZED TO 25C
FIGURE 4. LINE REGULATION - 3 UNITS
50 DELTA VOUT (V) (NORMALIZED TO VIN = 3.0V) +85C 25 50mV/DIV +25C 0 -40C -25
VIN = +0.3V
VIN = -0.3V
-50 2.7
3.4
4.1 VIN
4.8
5.5 500s/DIV
FIGURE 5. LINE REGULATION - 3 TEMPS
FIGURE 6. LINE TRANSIENT RESPONSE, CL = 0nF
VIN = +0.3V
0 -10 -20 -30 PSRR (dB) CL = 0nF CL = 1nF CL = 10nF CL = 100nF
50mV/DIV
-40 -50 -60 -70 -80 -90
VIN = -0.3V
-100 500s/DIV
1
10
100 1000 10000 FREQUENCY (Hz)
100000
1000000
FIGURE 7. LINE TRANSIENT RESPONSE, CL = 1nF
FIGURE 8. PSRR vs f vs CL
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FN8087.1 May 5, 2005
ISL60007 Typical Performance Curves, 1.25V Reference
0.40 +85C 0.30 0.20 +25C 0.10 0.00 -0.10 -0.20 -7 50mV/DIV IL= +50A
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
DELTA V (mV)
-40C
IL= -50A -6 -5 -4 SINKING -3 -2 -1 0 1 2 3 4 5 6 SOURCING 7 200s/DIV
OUTPUT CURRENT (mA)
FIGURE 9. LOAD REGULATION vs TEMP
FIGURE 10. LOAD TRANSIENT RESPONSE @ IL=50A, CL=1nF
3.5 3 IL= +7mA VIN AND VOUT (V) 200mV/DIV 2.5 2 1.5 1 0.5 0 500s/DIV VIN
VOUT
IL= -7mA
0
2
4
6 TIME (ms)
8
10
12
FIGURE 11. LOAD TRANSIENT RESPONSE @ IL=7mA, CL=1nF
FIGURE 12. TURN-ON TIME @ TA = 25C VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified
500
Typical Performance Curves, 2.5V Reference
800 700 600 IIN (nA) 500 400 300 200 100 2.7 400nA 570nA
450 +85C IIN (nA) 400 +25C -40C
250nA
350
3.4
4.1 VIN (V)
4.8
5.5
300 2.7
3.4
4.1 VIN (V)
4.8
5.5
FIGURE 13. IIN vs VIN - 3 UNITS
FIGURE 14. IIN vs VIN - 3 TEMPS
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FN8087.1 May 5, 2005
ISL60007 Typical Performance Curves, 2.5V Reference
2.5008 NORMALIZED TO +25C 2.5006 UNIT 2 2.5004 2.5002 VOUT (V) 2.5 2.4998 2.4996 2.49990 2.4994 2.4992 -40 2.49980 2.7 3.4 4.1 VIN (V) 4.8 5.5 UNIT 1 UNIT 3 VOUT (V) 2.50010 2.50020 UNIT 2 UNIT 3 UNIT 1 2.50000
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
2.50030 NORMALIZED TO 2.50V AT VIN = 3V
-15
10 35 TEMPERATURE (C)
60
85
FIGURE 15. VOUT vs TEMP - 3 UNITS
FIGURE 16. LINE REGULATION - 3 UNITS
200 NORMALIZED TO VIN = 3V 150 DELTA VOUT (V) (V) 100 +85C 50 0 -50 -100 100mV/DIV -40C +25C
VIN = +0.3V
VIN = -0.3V
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
VIN = +0.3V
0 -10 -20 -30
NO LOAD 1nF LOAD
100mV/DIV
PSRR (dB)
-40 -50 -60 -70 -80 -90 -100 1 10 100
100nF LOAD 10nF LOAD
VIN = -0.3V
1000
10000
100000
1000000
1ms/DIV
FREQUENCY (Hz)
FIGURE 19. LINE TRANSIENT RESPONSE, CL = 1nF
FIGURE 20. PSRR vs f vs CL
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FN8087.1 May 5, 2005
ISL60007 Typical Performance Curves, 2.5V Reference
0.30 0.20 DELTA VOUT (mV) 0.10 0.00 -0.10 -0.20 IL= -50A -0.30 -7 -6 -5 -4 SINKING -3 -2 -1 0 1 2 3 4567 SOURCING IL= +50A +85C +25C -40C 50mV/DIV
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
OUTPUT CURRENT
100s/DIV
FIGURE 21. LOAD REGULATION vs TEMP
FIGURE 22. LOAD TRANSIENT RESPONSE @ IL=50A, CL=1nF
3.5 IL= +7mA VIN & VOUT (V) 3 2.5 200mV/DIV 2 1.5 1 0.5 IL= -7mA 500s/DIV 0
VIN VOUT
0
2
4
6 TIME (ms)
8
10
12
FIGURE 23. LOAD TRANSIENT RESPONSE @ IL=7mA, CL=1nF
FIGURE 24. TURN-ON TIME @ TA = 25C
140 120 100nF LOAD 100 ZOUT () 80 60 40 20 0 1 10 100 1000 10nF LOAD
1nF LOAD
NO LOAD 10V/DIV 10000 100000 10s/DIV
FREQUENCY (Hz)
FIGURE 25. ZOUT vs f vs CL
FIGURE 26. VOUT NOISE
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FN8087.1 May 5, 2005
ISL60007 Applications Information
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.
VIN VOUT ISL60007 GND 0.001F-0.01F REF IN SERIAL BUS ENABLE SCK SDAT 12 TO 24-BIT A/D CONVERTER VIN = +3.0V 10F 0.01F
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.
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.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 30VP-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 400VP-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 50VP-P using a 0.001F capacitor on the output. Noise in the 1kHz to 100kHz band can be further reduced using a 0.1F capacitor on the output, but noise in the 1Hz to 100Hz band increases due to instability of the very low power amplifier with a 0.1F capacitance load. For load capacitances above 0.001F 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 40VP-P from 1Hz to 1MHz using this network with a 0.01F capacitor and a 2k resistor in series with a 10F capacitor.
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FN8087.1 May 5, 2005
ISL60007
400 350 NOISE VOLTAGE (VP-P) 300 250 200 150 100 50 0 1 10 100 1000 10000 100000 CL = 0.1F CL= 0.001F VIN AND VOUT (V) CL = 0.01F & 10F + 2k CL = 0
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.
3.5 3 2.5 2 1.5 1 0.5 0 400nA 570nA 250nA VIN
FIGURE 28. NOISE REDUCTION
VIN = 3.0V 10F 0.1F VIN ISL60007 GND 0.01F 10F VO 2k
0
2
4
6 TIME (ms)
8
10
12
FIGURE 30. TURN-ON TIME (+25C)
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 = 25C) and multiplied by 106 to yield ppm/C. This is the "Box" method for specifying temperature coefficient.
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
Typical Application Circuits
VIN = 5V R = 200 2N2905 VIN ISL60007 VOUT GND 2.5V/50mA 0.001F
FIGURE 31. PRECISION 2.5V, 50mA REFERENCE
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FN8087.1 May 5, 2005
ISL60007 Typical Application Circuits (Continued)
VIN = 3.0V 0.1F 10F
VIN ISL60007 VOUT 0.001F 2.5V
GND
VIN ISL60007 VOUT GND R1 -VIN = -3.0V -2.5V 0.001F R1 = 2.5V-|VIN| -(IOUT) ; IOUT 7mA
FIGURE 32. 2.5V DUAL OUTPUT, HIGH ACCURACY REFERENCE
VIN = 3.0V 0.1F 10F
VIN VOUT ISL60007 GND + EL8178 - VOUT SENSE LOAD
FIGURE 33. KELVIN SENSED LOAD
ISL60007 VIN GND CIN 0.001 COUT = 0.001F -2.5V R1 = 200 -3.0V R1 LIMITS MAX LOAD CURRENT with R1 = 200; ILOAD MAX = 2.5mA R1 = 2.5V-|VIN| -(IOUT) ; IOUT 7mA VOUT
FIGURE 34. NEGATIVE VOLTAGE REFERENCE
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FN8087.1 May 5, 2005
ISL60007 Typical Application Circuits (Continued)
2.7-5.5V 0.1F 10F
VIN VOUT ISL60007 GND
0.001F VCC SDA SCL VSS RL RH + EL8178 - VOUT (BUFFERED)
X9119 2-WIRE BUS
VOUT
FIGURE 35. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE
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FN8087.1 May 5, 2005
ISL60007 Packaging Information
8-Lead Plastic, SOIC, Package Code B8
0.150 (3.80) 0.158 (4.00) Pin 1 Index Pin 1
0.228 (5.80) 0.244 (6.20)
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 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250"
0.050" Typical
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

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