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ISL60007
Data Sheet August 2004 FN8087
PRELIMINARY
Precision 2.50V, 1.08-Watt, FGATM Voltage Reference
The ISL60007 FGATM voltage references are 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 companion to high resolution, low power data conversion systems.
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 * 10ppm/1kHrs Long Term Stability * 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 ISL60007BIB825 ISL60007CIB825 ISL60007DIB825 -40 to +85 -40 to +85 -40 to +85 GRADE VOUT OPTION 2.500V 2.500V 2.500V
Applications
* High Resolution A/Ds & D/As * Digital Meters * Bar Code Scanners * Mobile Communications * PDA's and Notebooks * Battery Management Systems * Medical Systems
8 Ld SOIC 0.5mV, 3ppm/C 8 Ld SOIC 0.5mV, 5ppm/C 8 Ld SOIC 1.0mV, 10ppm/C
Pinout
ISL60007 (8 LD SOIC) TOP VIEW
GND 1 VIN 2 DNC 3 GND 4 8 7 6 5 DNC DNC VOUT DNC
Typical Application
VIN = +3.0V 0.1F VIN 10F
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 17 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. 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 VOUT VOA
Operating Conditions: VIN = 3.0V, IOUT = 0mA, COUT = 0.001F, TA = -40 to +85C, unless otherwise specified. CONDITIONS MIN TYP 2.500 ISL60007B25 ISL60007C25 ISL60007D25 -0.5 -0.5 -1.0 +0.5 +0.5 +1.0 3 5 10 2.7 400 +2.7V VIN +5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA 30 15 50 10 50 40 30 80 5.5 800 200 50 150 MAX UNITS V mV mV mV ppm/C ppm/C ppm/C V nA V/V V/mA V/mA ppm/1kHrs ppm mA Vp-p
PARAMETER Output Voltage VOUT Accuracy @ TA = 25C
TC VOUT
Output Voltage Temperature Coefficient (Note 1)
ISL60007B25 ISL60007C25 ISL60007D25
VIN IIN VOUT/VIN
Input Voltage Range Supply Current Line Regulation
VOUT/IOUT Load Regulation
VOUT/t VOUT/TA ISC VN NOTES:
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
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.
2
ISL60007 Typical Performance Curves
800 700 600 IIN (nA) 500 400 300 200 100 2.7 300 2.7 400nA 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
2.50030 2.5008 2.5006 2.5004 VOUT (V) 2.5002 2.5 2.4998 2.4996 2.4994 2.4992 -40 2.49980 2.7 3.4 UNIT 1 NORMALIZED TO +25C UNIT 2 UNIT 3 VOUT (V) 2.50020
NORMALIZED TO 2.50V AT VIN = 3V
UNIT 2 2.50010 UNIT 3 UNIT 1 2.50000
2.49990
-15
10 35 TEMPERATURE (C)
60
85
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 100mV/DIV -40C +25C
VIN = +0.3V
VIN = -0.3V
2.7
3.4
4.1 VIN
4.8
5.5 1ms/DIV
FIGURE 5. LINE REGULATION - 3 TEMPS
FIGURE 6. LINE TRANSIENT RESPONSE, CL = 0nF
3
ISL60007 Typical Performance Curves
VIN = 3.0V, IOUT = 0mA, TA = 25C unless otherwise specified (Continued)
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 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 IL= +50A +85C +25C -40C 50mV/DIV
OUTPUT CURRENT
100s/DIV
FIGURE 9. LOAD REGULATION vs TEMP
FIGURE 10. LOAD TRANSIENT RESPONSE @ IL = 50A
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 11. LOAD TRANSIENT RESPONSE @ IL = 7mA
FIGURE 12. TURN-ON TIME @ TA = 25C
4
ISL60007 Typical Performance Curves
140 120 100nF LOAD 100 ZOUT () 80 60 40 20 0 1 10 100 1000 10000 100000 10s/DIV FREQUENCY (Hz) 10nF LOAD NO LOAD 10V/DIV
VIN = 3.0V, IOUT = 0mA, TA = 25C unless otherwise specified (Continued)
1nF LOAD
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.
5
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 ISL60007 GND 0.01F 10F VO 2k
FIGURE 17.
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 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 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 1 10 100 1000 10000 100000 CL = 0.1F CL= 0.001F CL = 0.01F & 10F + 2k CL = 0
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 2.5 VIN & VOUT (V) 2 1.5 1 0.5 0 400nA 570nA 250nA VIN
0
2
4
6 TIME (ms)
8
10
12
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.
FIGURE 16. NOISE REDUCTION
6
ISL60007 Typical Application Circuits
VIN = 3.0V R = 200 2N2905 VIN ISL60007 VOUT GND 2.5V/50mA 0.001F
FIGURE 19. PRECISION 2.5V, 50mA REFERENCE
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 20. 2.5V DUAL OUTPUT, HIGH ACCURACY REFERENCE
VIN = 3.0V 0.1F 10F
VIN VOUT ISL60007 GND + - LOAD VOUT SENSE
FIGURE 21. KELVIN SENSED LOAD
7
ISL60007 Typical Application Circuits (Continued)
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 22. NEGATIVE VOLTAGE REFERENCE
2.7-5.5V 0.1F 10F
VIN VOUT ISL60007 GND
0.001F VCC SDA SCL VSS RL RH + - VOUT (BUFFERED) VOUT
X9119 2-WIRE BUS
FIGURE 23. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE
8
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 9

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