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ISL60007
Data Sheet April 21, 2006 FN8087.3
Precision 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 . . . . . . . . . . . . . . . . . . . . . . . . . . 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 * Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL60007 (8 LD SOIC) TOP VIEW
GND 1 VIN 2 DNC 3 GND 4 8 7 6 5 DNC DNC VOUT DNC
Applications
* High Resolution A/Ds & D/As * Digital Meters * Bar Code Scanners * Mobile Communications * PDA's and Notebooks
Pin Descriptions
PIN NAME GND VIN VOUT DNC Ground Connection Power Supply Input Connection Voltage Reference Output Connection Do Not Connect; Internal Connection - Must Be Left Floating DESCRIPTION
* Battery Management Systems * Medical Systems
Ordering Information
PART NUMBER ISL60007BIB825 ISL60007BIB825Z (Note) ISL60007CIB825 ISL60007CIB825Z (Note) ISL60007DIB825 ISL60007DIB825Z (Note) PART MARKING 60007BI 25 60007BI Z25 60007CI 25 60007CI Z25 60007DI 25 60007DI Z25 VOUT OPTION 2.500V 2.500V 2.500V 2.500V 2.500V 2.500V GRADE 0.5mV, 3ppm/C 0.5mV, 3ppm/C 0.5mV, 5ppm/C 0.5mV, 5ppm/C 1.0mV, 10ppm/C 1.0mV, 10ppm/C TEMP. RANGE (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 PACKAGE 8 Ld SOIC PKG. DWG. # MDP0027
8 Ld SOIC (Pb-free) MDP0027 8 Ld SOIC MDP0027
8 Ld SOIC (Pb-free) MDP0027 8 Ld SOIC MDP0027
8 Ld SOIC (Pb-free) MDP0027
*Add "-TK" suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2004-2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL60007 Typical Application
VIN = +3.0V 0.1F VIN 10F
VOUT 0.001F*
ISL60007 GND REF IN SERIAL BUS ENABLE SCK SDAT 16 TO 24-BIT A/D CONVERTER
*Also see Figure 17 in Applications Information.
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FN8087.3 April 21, 2006
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
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 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. Long Term Stability (Note 4) Thermal Hysteresis (Note 2) Short Circuit Current (Note 3) Output Voltage Noise TA = 25C TA = 125C TA = 25C, VOUT tied to Gnd 0.1Hz f 10Hz 2.7 400 30 15 50 10 50 40 30 80 -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 mA Vp-p
VOUT/IOUT Load Regulation
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FN8087.3 April 21, 2006
ISL60007 Typical Performance Curves, 2.5V Reference
800 700 600 IIN (nA) 500 400nA 400 300 200 100 2.7 300 2.7 570nA IIN (nA) 450 +85C 400 +25C -40C 250nA 350
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified
500
3.4
4.1 VIN (V)
4.8
5.5
3.4
4.1 VIN (V)
4.8
5.5
FIGURE 1. IIN vs VIN - 3 UNITS
FIGURE 2. IIN vs VIN - 3 TEMPS
2.5008 NORMALIZED TO +25C 2.5006 UNIT 2 2.5004 UNIT 1 2.5002 VOUT (V) 2.5 2.4998 2.4996 UNIT 3 VOUT (V)
2.50030
NORMALIZED TO 2.50V AT VIN = 3V
2.50020 UNIT 2 2.50010 UNIT 3 UNIT 1 2.50000
2.49990 2.4994 2.4992 -40 2.49980 2.7
-15
10 35 TEMPERATURE (C)
60
85
3.4
4.1 VIN (V)
4.8
5.5
FIGURE 3. VOUT vs TEMP - 3 UNITS
FIGURE 4. LINE REGULATION - 3 UNITS
200 NORMALIZED TO VIN = 3V 150 DELTA VOUT (V) (V) 100 +85C 50 0 -50 -100 2.7 3.4 4.1 VIN 4.8 5.5 1ms/DIV 100mV/DIV -40C +25C
VIN = +0.3V
VIN = -0.3V
FIGURE 5. LINE REGULATION - 3 TEMPS
FIGURE 6. LINE TRANSIENT RESPONSE, CL = 0nF
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FN8087.3 April 21, 2006
ISL60007 Typical Performance Curves, 2.5V Reference
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
0 -10 -20 -30 PSRR (dB) 100mV/DIV -40 100nF LOAD -50 10nF LOAD -60 -70 -80 -90 -100 1 1ms/DIV 10 100 1k 10k 100k 1M FREQUENCY (Hz) 1nF LOAD
VIN = +0.3V
NO LOAD
VIN = -0.3V
FIGURE 7. LINE TRANSIENT RESPONSE, CL = 1nF
FIGURE 8. PSRR vs f vs CL
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 OUTPUT CURRENT 100s/DIV IL= +50A +85C +25C -40C 50mV/DIV
FIGURE 9. LOAD REGULATION vs TEMP
FIGURE 10. LOAD TRANSIENT RESPONSE @ IL=50A, CL=1nF
3.5 IL= +7mA VIN & VOUT (V) 3 2.5 200mV/DIV VOUT 2 1.5 1 0.5 IL= -7mA 500s/DIV 0 0 2 4 6 TIME (ms) 8 10 12
VIN
FIGURE 11. LOAD TRANSIENT RESPONSE @ IL=7mA, CL=1nF
FIGURE 12. TURN-ON TIME @ TA = 25C
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FN8087.3 April 21, 2006
ISL60007 Typical Performance Curves, 2.5V Reference
140 1nF LOAD 120 100nF LOAD 100 10nF LOAD ZOUT () 80 60 40 20 0 1 10 100 1k 10k 100k 10s/DIV FREQUENCY (Hz) NO LOAD 10V/DIV
VIN = 3.0V, IOUT = 0mA, TA = 25C Unless Otherwise Specified (Continued)
FIGURE 13. ZOUT vs f vs CL
FIGURE 14. VOUT NOISE
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.
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 15. 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.
VIN = +3.0V
10F VIN
0.01F
VOUT
ISL60007 GND 0.001F-0.01F REF IN SERIAL BUS ENABLE SCK SDAT 12 TO 24-BIT A/D CONVERTER
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
FIGURE 15.
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FN8087.3 April 21, 2006
ISL60007
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.
VIN = 3.0V 10F 0.1F VIN VO ISL60007 GND 0.01F 10F 2k
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 16. 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 16 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 17 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Figure 16, 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.
400 350 NOISE VOLTAGE (VP-P) 300 250 200 150 100 50 0 CL = 0.1F CL= 0.001F CL = 0.01F & 10F + 2k CL = 0
FIGURE 17.
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 current. Normal turn-on time is typically 4ms. This is shown in Figure 18. 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 VIN AND VOUT (V) 2.5 2 1.5 1 0.5 0 0 2 4 6 TIME (ms) 8 10 12 400nA 570nA 250nA VIN
FIGURE 18. 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.
1
10
100
1000
10000
100000
FIGURE 16. NOISE REDUCTION
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FN8087.3 April 21, 2006
ISL60007
Typical Application Circuits
VIN = 5V R = 200 2N2905
VIN ISL60007 VOUT 2.5V/50mA 0.001F GND
FIGURE 19. PRECISION 2.5V, 50mA REFERENCE
VIN = 3.0V
0.1F
10F
VIN ISL60007 VOUT 0.001F 2.5V
GND
VIN ISL60007 VOUT 0.001F GND R1 -VIN = -3.0V -2.5V R1 = 2.5V-|VIN| -(IOUT) ; IOUT 7mA
FIGURE 20. 2.5V DUAL OUTPUT, HIGH ACCURACY REFERENCE
VIN = 3.0V 0.1F 10F
VIN VOUT ISL60007 GND + EL8178 - VOUT SENSE LOAD
FIGURE 21. KELVIN SENSED LOAD
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FN8087.3 April 21, 2006
ISL60007 Typical Application Circuits (Continued)
ISL60007 VIN VOUT
GND CIN 0.001 COUT = 0.001F -2.5V R1 = 200 R1 LIMITS MAX LOAD CURRENT with R1 = 200; ILOAD MAX = 2.5mA R1 = -3.0V 2.5V-|VIN| -(IOUT) ; IOUT 7mA
FIGURE 22. NEGATIVE VOLTAGE REFERENCE
2.7-5.5V 0.1F 10F
VIN VOUT ISL60007 GND
0.001F
VCC SDA 2-WIRE BUS SCL VSS
RH +
VOUT
X9119 EL8178 - RL VOUT (BUFFERED)
FIGURE 23. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE
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FN8087.3 April 21, 2006
ISL60007 Small Outline Package Family (SO)
A D N (N/2)+1 h X 45
A E E1 PIN #1 I.D. MARK c SEE DETAIL "X"
1 B
(N/2) L1
0.010 M C A B e C H A2 GAUGE PLANE A1 0.004 C 0.010 M C A B b DETAIL X
SEATING PLANE L 4 4
0.010
MDP0027
SMALL OUTLINE PACKAGE FAMILY (SO) SYMBOL A A1 A2 b c D E E1 e L L1 h N NOTES: 1. Plastic or metal protrusions of 0.006" maximum per side are not included. 2. Plastic interlead protrusions of 0.010" maximum per side are not included. 3. Dimensions "D" and "E1" are measured at Datum Plane "H". 4. Dimensioning and tolerancing per ASME Y14.5M-1994 SO-8 0.068 0.006 0.057 0.017 0.009 0.193 0.236 0.154 0.050 0.025 0.041 0.013 8 SO-14 0.068 0.006 0.057 0.017 0.009 0.341 0.236 0.154 0.050 0.025 0.041 0.013 14 SO16 (0.150") 0.068 0.006 0.057 0.017 0.009 0.390 0.236 0.154 0.050 0.025 0.041 0.013 16 SO16 (0.300") (SOL-16) 0.104 0.007 0.092 0.017 0.011 0.406 0.406 0.295 0.050 0.030 0.056 0.020 16 SO20 (SOL-20) 0.104 0.007 0.092 0.017 0.011 0.504 0.406 0.295 0.050 0.030 0.056 0.020 20 SO24 (SOL-24) 0.104 0.007 0.092 0.017 0.011 0.606 0.406 0.295 0.050 0.030 0.056 0.020 24 SO28 (SOL-28) 0.104 0.007 0.092 0.017 0.011 0.704 0.406 0.295 0.050 0.030 0.056 0.020 28 TOLERANCE MAX 0.003 0.002 0.003 0.001 0.004 0.008 0.004 Basic 0.009 Basic Reference Reference NOTES 1, 3 2, 3 Rev. L 2/01
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 10
FN8087.3 April 21, 2006

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