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X60008B-25, X60008C-25, X60008D-25
Data Sheet May 24, 2006 FN8140.1
Precision 2.5V FGATM Voltage Reference
FEATURES * Output Voltage: 2.500V * Absolute Initial Accuracy Options: 0.5mV & 1.0mV * Ultra Low Power Supply Current: 500nA * Low Temperature Coefficient Options: 3, 5 & 10ppm/C * 10mA Source & Sink Current Capability * 10ppm/1000hrs Long Term Stability * Supply Voltage Range: 4.5V to 6.5V * 5kV ESD (Human Body Model) * Standard Package: 8 Ld SOIC * Temp Range: -40C to +85C * Pb-Free Plus Anneal Available (RoHS Compliant) APPLICATIONS * High Resolution A/Ds & D/As * Digital Meters * Calibration Systems * V-F Converters TYPICAL APPLICATION
DESCRIPTION The X60008-25 FGATM 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 XFETTM technologies. FGATM 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.
* Precision Current Sources * Precision Regulators * Precision Oscillators * Battery Management Systems
* Smart sensors * Strain Gage Bridges * Threshold Detectors * Servo Systems
VIN = +5.0V VIN
0.1F VOUT X60008-25 GND
10F
0.001F(*)
REF IN Serial Bus Enable SCK SDAT 16 to 24-bit A/D Converter
(*)Also see Figure 3 in Applications Information
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X60008B-25
PACKAGE DIAGRAM
X60008-XX SOIC GND VIN DNC GND 1 2 3 4 8 7 6 5 DNC DNC VOUT DNC
PIN CONFIGURATIONS 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
Ordering Information
PART NUMBER X60008BIS8-25* X60008BIS8Z-25* (Note) X60008CIS8-25 X60008CIS8Z-25* (Note) X60008DIS8-25* X60008DIS8Z-25* (Note) PART MARKING X60008B I25 X60008B ZI25 X60008C I25 X60008C ZI25 X60008D I25 X60008D ZI25 VOUT (V) 2.5 2.5 2.5 2.5 2.5 2.5 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 TEMPERATURE RANGE (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 PACKAGE 8 Ld SOIC (150 mil) 8 Ld SOIC (150 mil) (Pb-free) 8 Ld SOIC (150 mil) 8 Ld SOIC (150 mil) (Pb-free) 8 Ld SOIC (150 mil) 8 Ld SOIC (150 mil) (Pb-free) PKG. DWG. # MDP0027 MDP0027 MDP0027 MDP0027 MDP0027 MDP0027
*Add "T1" 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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ABSOLUTE MAXIMUM RATINGS
Storage Temperature Range..................-65C to +125C Max Voltage Applied VIN to Gnd ............... -0.5V to +6.5V Max Voltage Applied VOUT to Gnd(*) ........ -0.5V to +3.5V Voltage on "DNC" pins......... No connections permitted to these pins. Lead Temperature, soldering(*) ...........................+ 225C
(*) note: maximum duration = 10 seconds
COMMENT 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. For guaranteed specifications and test conditions, see Electrical Characteristics. 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.
RECOMMENDED OPERATING CONDITIONS Temperature
Industrial
Min.
-40C
Max.
+85C
ELECTRICAL CHARACTERISTICS (Operating Conditions: VIN = 5.0V, IOUT = 0mA, COUT = 0.001F, TA = -40 to +85C unless otherwise specified.) Symbol
VOUT VOA
Parameter
Output Voltage VOUT Accuracy X60008B-25 X60008C-25 X60008D-25 Supply Current Input Voltage Range Output Voltage Temperature Coefficient(1) Line Regulation Load Regulation Long Term Stability Thermal Hysteresis(2) Short Circuit Current(3) Output Voltage Noise
Conditions
TA = 25C
Min
Typ
2.500
Max
Units
V mV
-0.50 -0.50 -1.00 500 4.5
+0.50 +0.50 +1.00 800 6.5 3 5 10 100 10 20 10 50 50 30 80 40 80 nA V ppm/C
IIN VIN TC VOUT
X60008B-25 X60008C-25 X60008D-25 +4.5V VIN +6.5V 0mA ISOURCE 10mA -10mA ISINK 0mA TA = 25C T = -40C to +85C TA = 25C 0.1Hz to 10Hz
VOUT/VIN VOUT/IOUT VOUT/t VOUT/TA ISC VN
Note:
V/V V/mA ppm/ 1000Hrs ppm mA Vpp
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 created by package stress @ TA = 25C after temperature cycling. VOUT is read initially at TA = 25C; the X60008 is then cycled between Hot (85C) and Cold (-40C) before a second VOUT measurement is taken at 25C. The deviation between the initial VOUT reading and the second VOUT reading is then expressed in ppm. 3. Guaranteed by device characterization and/or correlation to other device tests.
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25C unless otherwise specified)
LINE REGULATION
2.50008
80 60
LINE REGULATION
310nA 520nA 690nA
VOUT (V) (normailized to 2.5V at VIN = 5V)
DELTA VO (V) (normailized to VIN = 5.00V)
2.50006 2.50004 2.50002 2.5 2.49998 2.49996 2.49994 4.5
40 20 0 -20 -40 -60 -80 -100 4.5 5 5.5 6 6.5 -40C +25C +85C
5
5.5
6
6.5
VIN (V)
VIN (V)
LOAD REGULATION
0.7 0.6 0.5
0.1Hz to 10Hz VOUT NOISE Band Pass Filter with 1 zero at .1Hz and 2 poles at 10 Hz
DELTA VOUT (mV)
0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -20 -15 -10 -5 SINKING 0 IOUT (mA) 5 10 15 SOURCING 20 1 Sec/div +85C +25C -40C
VOUT vs TEMPERATURE Normalized to 25C
2.502 0 -10 -20 2.501 520nA 690nA -30 -40
10V/div
PSRR vs CAP Load
No Load 1nF Load
VOUT (V)
PSRR (dB)
2.5 320nA 2.499
-50 -60 -70
10nF Load
100nF Load -80 -90
2.498 -40 -15 10 35 60 85 TEMPERATURE (C)
-100 1 10 100 1000 10000 100000 1000000 FREQUENCY (Hz)
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25C unless otherwise specified)
10mA LOAD TRANSIENT RESPONSE 50A LOAD TRANSIENT RESPONSE
CL = .001F
CL = .001F
500mV/DIV
I IN = -10mA I IN = +10mA
100mV/DIV
IIN = -50A I IN = +50A
1mS/DIV
500SEC/DIV
LINE TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
CL = 0
CL = .001F
200mV/DIV
VIN = -500mV
VIN = +500mV
200mV/DIV
VIN = -500mV
VIN = +500mV
500SEC/DIV
500SEC/DIV
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 5.0V, IOUT = 0mA, TA = 25C unless otherwise specified)
ZOUT vs FREQUENCY
600
300
IIN vs VIN
250
no Load 1nF Load
580
-40C +25C +85C
200
ZOUT ()
560
I IN (nA)
10nF Load 150
540
100
520
50 100nF Load 0 100 10 100 1000 10000 100000 FREQUENCY (Hz)
500
480 4.5
5
5.5
6
6.5
VIN (V)
IIN vs VIN
800 3 units representative of IIN Range 700 5 600 500 4 6
TURN-ON TIME
VIN
VIN & VOUT (V)
I IN (nA)
400 300 200
3 VOUT 2
1 100 0 4.5 0 5 5.5 6 6.5 -1 1 3 5 7 9 11
VIN (V)
TIME (mSec)
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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 possible 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. 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 = 4.5V to 6.5V VIN 10F 0.01F
VOUT X60008-25 GND 0.001F REF IN Enable SCK SDAT 12 to 24-bit A/D Converter
Serial Bus
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 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 .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 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 be reduced to about 50Vpp using a .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
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load capacitances above .001F the noise reduction network shown in fig. 3 is recommended. This network reduces noise sig-nificantly over the full bandwidth. As shown in fig. 2, noise is reduced to less than 40Vp-p from 1Hz to 1MHz using this network with a .01F capacitor and a 2k resistor in series with a 10F capacitor. Figure 2.
400 350 NOISE VOLTAGE (Vp-p) 300 250 200 150 100 50 0 1 10 100 1000 10000 100000
1
VIN & VOUT (V)
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 (25C)
X60008-25 NOISE REDUCTION
CL = 0 CL = .001F CL = .1F CL = .01F & 10F + 2k
6
5
VIN
4 690 nA 3 VOUT 2 520 nA 320 nA
Figure 3.
VIN = 6.5V 10F .1F VO X60008-25 GND .01F 10F 2k VIN
0 -1 1 3 5 TIME (mSec) 7 9
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.
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TYPICAL APPLICATION CIRCUITS
Precision 2.5V, 50mA Reference.
VIN = 5.2V to 6.5V R = 200 2N2905 VIN X60008-25 VOUT GND 2.5V/50mA 0.009F
Kelvin Sensed Load
5.0V 0.1F VIN VOUT X60008-25 GND + - VOUT Sense Load
2.5V Full Scale Low-Drift 10-bit Adjustable Voltage Source
4.5V to 6.5V 0.1F VIN VOUT X60008-25 GND
0.01F VCC RH X9119 2-Wire Bus SDA SCL VSS RL + - VOUT
VOUT (buffered)
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FN8140.1 May 24, 2006
X60008B-25 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
FN8140.1 May 24, 2006

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