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X60008A-50
Data Sheet March 15, 2005 FN8139.0
1ppm/C, 5.0V, Precision Low-Power FGATM Voltage Reference
FEATURES * * * * * * * * Ultra-Low Temperature Coefficient: 1ppm/C Absolute Initial Accuracy: 0.5mV 10ppm Thermal Hysteresis Ultra-Low Supply Current : 800nA maximum Long Term Stability: 10ppm/1,000Hrs 10mA Source & Sink Current 80 mA Short Circuit Current Continuous ESD: 5kV (Human Body Model), 500V (Machine Model) * Standard SOIC-8 Package * Temp. Range: -40C to +85C
DESCRIPTION The X60008A-50 is an extremely stable low power, high accuracy voltage reference fabricated in Intersil's proprietary Floating Gate Analog technology. The X60008A-50 features guaranteed 1 ppm/C maximum temperature coefficient, absolute initial accuracy of 500V and extremely low, 10ppm thermal hysteresis. Operating power consumption is typically 500nA and load regulation is guaranteed up to 10mA (source and sink). Short circuit current is guaranteed at 80mA continuous. The excellent accuracy and stability performance of the X60008A-50 coupled with its low power consumption is an ideal choice for battery powered high resolution data acquisition systems.
APPLICATIONS * * * * * High Resolution A/Ds & D/As High-Accuracy Reference Standard Precision Regulators Precision Current Sources Smart sensors TYPICAL APPLICATION
VIN = +6.5V
* Digital Meters * ATE Equipment * V-F Converters * Strain Gage Bridges * Calibration Systems
* Precision Oscillators * Threshold Detectors * Process Control * Battery Management Systems * Servo Systems
0.1F VOUT X60008-50 GND VIN
10F
0.001F(*)
REF IN Serial Bus Enable SCK SDAT 16 to 24-bit A/D Converter
(*)Also see Figure 3 in Applications Information
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X60008A-50
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 X 60008 A I S8 - 50
Logo Device Part Number Grade Temperature Range Package VOUT Option 60008 = Standard A = 0.5 mV, 1ppm/C I = -40C to +85C S8 = 8 lead SOIC 50 = 5.000 V
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ABSOLUTE MAXIMUM RATINGS Storage Temperature Range............. -65C to +125C Voltage on any Pin Referred to Ground ............................................... -0.5V to +10V Lead Temperature (soldering, 10 seconds)................................ +225C COMMENT
Absolute Maximum Ratings indicate limits beyond which permanent damage to the device and impaired reliability may occur. 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 = +6.5V, IOUT = 0mA, TA = -40 to +85C unless otherwise noted). Symbol
VOUT VOA IIN VIN TC VOUT VOUT/VIN VOUT/VIN VOUT/IOUT VOUT/t VOUT/TA VOUT/TA ISC VN
Note:
Parameter
Output Voltage VOUT Accuracy Supply Current Input Voltage Range Output Voltage Temperature Coefficient Line Regulation Line Regulation Load Regulation Long Term Stability Thermal Hysteresis Thermal Hysteresis Short Circuit Current VOUT Noise TA = 25C
Conditions
Min
-0.5
Typ
5.000
Max
+0.5
Units
V mV nA V ppm/C V/V ppm/V V/mA ppm/ 1,000Hrs ppm ppm
500 5.1 -40C TA +85C (note:1) +5.5V VIN +8.0V +5.5V VIN +8.0V Sourcing: 0mA IOUT 10mA Sinking: -10mA IOUT 0mA TA = 25C TA = 25C (note: 2) TA = 125C (note: 3) TA = 25C (note: 4) 0.1Hz f 10Hz 10 20 10 10 50 50 30 0.5
800 9.0 1.0 100 20 50 100
80
mA Vp-p
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. Measured change in VOUT before and after changing temp by 25C. 3. 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. 4. Guaranteed by Device Characterization.
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 6.5V, IOUT = 0mA, TA = 25C unless otherwise specified)
250 200 DELTA VOUT (V) (normailized to VIN = 6.50V) -40C 150 100 50 0 -50 -100 5 5.5 6 6.5 7 VIN (V) 7.5 8 8.5 9 +25C +85C
LINE REGULATION
5.0003
4 Typical units
LINE REGULATION
VOUT (V) (normailized to 5.00V at VIN = 6.5V)
5.00025 5.0002 5.00015 5.0001 5.00005
5
4.99995 4.9999
5 5.5 6 6.5 7 7.5 8 8.5 9
VIN (V)
0.1Hz to 10Hz VOUT NOISE
LOAD REGULATION
0.6 0.5 0.4 Delta VOUT (mV) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -20 -15 -10 -5 0 5 10 15 20 85C
5V/div
Band Pass Filter with 1 zero at .1Hz and 2 poles at 10 Hz
-40C 25C
SINKING
SOURCING
10 Sec/div
OUTPUT CURRENT (mA)
VOUT vs TEMPERATURE Normalized to 25C
5.0095 5.008 5.0065 5.005 5.0035 5.0005 4.999 4.9975 4.996 4.9945 4.993 4.9915 4.99 -40 -20 0 20 40 60 80 TEMPERATURE (C) 5.002 4 Typical units
PSRR vs CAP LOAD
0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -00 -100 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) Load (nF) 10 1 No Load
VOUT (V)
100
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 6.5V, IOUT = 0mA, TA = 25C unless otherwise specified)
10mA LOAD TRANSIENT RESPONSE
CL = .001F
50A LOAD TRANSIENT RESPONSE
CL = .001F
500mV/DIV
100mV/DIV
IIN = -10mA IIN = +10mA
IIN = -50A IIN = +50A
1mSEC/DIV
500SEC/DIV
LINE TRANSIENT RESPONSE
CL = 0
LINE TRANSIENT RESPONSE
CL = .001F
200mV/DIV
VIN = -500mV
VIN = +500mV
200mV/DIV
VIN = -500mV
VIN = +500mV
500SEC/DIV
500SEC/DIV
MINIMUM VIN to VOUT DIFFERENTIAL vs. OUTPUT CURRENT VIN to VOUT Differential (V)
0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 0 2 4 6 8 10
0.0
-40C +25C +85C
Zout vs FREQUENCY
500.0
CL=.001F
400.0
CL=.01F
Zout ()
300.0
200.0
CL=.1F
100.0
1
10
100
1k
10k
100k
OUTPUT CURRENT (mA) (Sourcing)
FREQUENCY (Hz)
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TYPICAL PERFORMANCE CHARACTERISTIC CURVES (VIN = 6.5V, IOUT = 0mA, TA = 25C unless otherwise specified)
900 800 700 600 500
+85C
IIN vs VIN
700 600
IIN vs VIN
-40C +25C
IIN (nA)
IIN (nA)
5 units representative of IIN range
500 400 300
400 300 200 100
200 100 0
5.5
6
6.5
7
7.5
8
8.5
9
0
5.5
6
6.5
7
7.5
8
8.5
9
VIN (V)
VIN (V)
TURN-ON TIME
7 6
VIN
VIN & VOUT (V)
5 4
VOUT
3 2 1 0 0 2 4 6 8 10
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 practical 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 = +6-9V 10F VIN 0.01F
VOUT X60008-50 GND 0.001F REF IN Serial Bus Enable SCK SDAT 12 to 24-bit A/D Converter
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.
X60008-50 NOISE REDUCTION
400 350 NOISE VOLTAGE (Vp-p) 300 250 6 200 150 100 50 0 1 10 100 1000 10000 100000 VIN & VOUT (V) 5 4 3
IIN = 320nA IIN = 730nA IIN = 500nA CL = 0 CL = .001F CL = .1F CL = .01F & 10F + 2k
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.
X60008-50 TURN-ON TIME (25C)
7
2 1 0 -1 1 3 5 7 9 11 13 15
Figure 3.
VIN = 6.5V 10F .1F VO X60008-50 GND .01F 10F 2K VIN
TIME (mSec)
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 determining temperature coefficient.
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TYPICAL APPLICATION CIRCUITS
Precision 5V, 50mA Reference.
VIN = 6V-9V R = 200 2N2905 VIN X60008-50 VOUT GND 5.0V/50mA 0.001F
5.0V Dual Output, High Accuracy Reference
+5.5 to 9.0V
0.1F VIN X60008-50 VOUT GND
10F
5.0V 0.001F
VIN X60008-50 VOUT GND R1 VIN = -5.5V to -9.0V -5.0V 0.001F R1 = 5.0V - | VIN | ; IO UT 10mA -(IOUT)
Kelvin Sensed Load
5.5V to 9.0V 0.1F VIN VOUT X60008-50 GND + - Load VOUT Sense 10F
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TYPICAL APPLICATION CIRCUITS
Negative Voltage Reference
X60008-50 VIN VOUT GND CIN 0.001 COUT = 0.001F -5.0V R1 = 800 VIN = -9V R1 = R1 Limits max load current with RI = 800; ILOAD MAX = 4mA 5.0V - | VIN | -(IOUT)
5V Full Scale Low-Drift 10-bit Adjustable Voltage Source
5.5V to 9.0V 0.1F VIN VOUT X60008-50 GND 10F
.001F VCC RH X9119 2-Wire Bus SDA SCL VSS RL + - VOUT (buffered) VOUT
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PACKAGING INFORMATION
8-Lead Plastic, SOIC, Package Code S8
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 NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
0.030" Typical 8 Places
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 11
FN8139.0 March 15, 2005

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