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LT1461-2.5 Micropower Precision Low Dropout Series Voltage Reference
FEATURES
s s s s s s s s s s s
DESCRIPTIO
Trimmed to High Accuracy: 0.04% Max Low Drift: 3ppm/C Max Low Supply Current: 50A Max Temperature Coefficient Guaranteed to 125C High Output Current: 50mA Min Low Dropout Voltage: 300mV Max Excellent Thermal Regulation Power Shutdown Thermal Limiting Operating Temperature Range: - 40C to 125C Available in SO-8 Package
APPLICATIO S
s s s s
A/D and D/A Converters Precision Regulators Handheld Instruments Power Supplies
The LT (R)1461 is a low dropout micropower bandgap reference that combines very high accuracy and low drift with low supply current and high output drive. This series reference uses advanced curvature compensation techniques to obtain low temperature coefficient and trimmed precision thin-film resistors to achieve high output accuracy. The LT1461 draws only 35A of supply current, making it ideal for low power and portable applications, however its high 50mA output drive makes it suitable for higher power requirements, such as precision regulators. In low power applications, a dropout voltage of less than 300mV ensures maximum battery life while maintaining full reference performance. Line regulation is nearly immeasurable, while the exceedingly good load and thermal regulation will not add significantly to system error budgets. The shutdown feature can be used to switch full load currents and can be used for system power down. Thermal shutdown protects the part from overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Basic Connection
VIN 2.8V LT1461-2.5 CIN 1F CL 2F
1461 TA01
Load Regulation, PDISS = 200mW
2.5V
0mA IOUT 20mA
VOUT LOAD REG 1mV/DIV
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10ms/DIV
1461 TA02
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1
LT1461-2.5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW DNC* 1 VIN 2 SHDN 3 GND 4 8 7 6 5 DNC* DNC* VOUT DNC*
Input Voltage ........................................................... 20V Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range (Note 2) ........................................... - 40C to 125C Specified Temperature Range Commercial ............................................ 0C to 70C Industrial ........................................... - 40C to 85C High ................................................. - 40C to 125C Storage Temperature Range (Note 3) ... - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
S8 PACKAGE 8-LEAD PLASTIC SO *DNC: DO NOT CONNECT TJMAX = 130C, JA = 190C/ W
LT1461ACS8-2.5 LT1461BCS8-2.5 LT1461CCS8-2.5 LT1461AIS8-2.5 LT1461BIS8-2.5 LT1461CIS8-2.5 LT1461DHS8-2.5 S8 PART MARKING 461A25 61BI25 461B25 61CI25 461C25 61DH25 61AI25
Consult factory for Military grade parts.
AVAILABLE OPTIO S
GRADE LT1461ACS8-2.5/LT1461AIS8-2.5 LT1461BCS8-2.5/LT1461BIS8-2.5 LT1461CCS8-2.5/LT1461CIS8-2.5 LT1461DHS8-2.5, - 40C to 125C INITIAL ACCURACY (%) 0.04% 0.06% 0.08% 0.15% MAXIMUM TEMPERATURE COEFFICIENT (ppm/C) 3 7 12 20
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VIN - VOUT = 0.5V, Pin 3 = 2.4V, CL = 2F, unless otherwise specified.
PARAMETER Output Voltage (Note 4) CONDITIONS LT1461ACS8-2.5/LT1461AIS8-2.5 LT1461BCS8-2.5/LT1461BIS8-2.5 LT1461CCS8-2.5/LT1461CIS8-2.5 LT1461DHS8-2.5 Output Voltage Temperature Coefficient (Note 5) LT1461ACS8-2.5/LT1461AIS8-2.5 LT1461BCS8-2.5/LT1461BIS8-2.5 LT1461CCS8-2.5/LT1461CIS8-2.5 LT1461DHS8-2.5
q q q q
ELECTRICAL CHARACTERISTICS
MIN 2.499 - 0.04 2.4985 - 0.06 2.498 - 0.08 2.49625 - 0.15
TYP 2.500 2.500 2.500 2.500 1 3 5 7
MAX 2.501 0.04 2.5015 0.06 2.502 0.08 2.50375 0.15 3 7 12 20
UNITS V % V % V % V % ppm/C ppm/C ppm/C ppm/C
2
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LT1461-2.5
The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VIN - VOUT = 0.5V, Pin 3 = 2.4V, CL = 2F, unless otherwise specified.
PARAMETER Line Regulation CONDITIONS (VOUT + 0.5V) VIN 20V
q
ELECTRICAL CHARACTERISTICS
MIN
TYP 2
MAX 8 12 50 30 40 50
UNITS ppm/V ppm/V ppm/V ppm/mA ppm/mA ppm/mA V V V V mA V A V A A A A A VP-P ppmP-P VRMS ppmRMS ppm/kHr ppm ppm ppm
LT1461DHS8 Load Regulation Sourcing (Note 6) VIN = VOUT + 2.5V 0 IOUT 50mA
q
15 12
q
LT1461DHS8, 0 IOUT 10mA Dropout Voltage VIN - VOUT, VOUT Error = 0.1% IOUT = 0mA IOUT = 1mA IOUT = 10mA IOUT = 50mA, I and C Grades Only Short VOUT to GND Logic High Input Voltage Logic High Input Current, Pin 3 = 2.4V Logic Low Input Voltage Logic Low Input Current, Pin 3 = 0.8V Supply Current Shutdown Current Output Voltage Noise (Note 7) No Load
q
q q q
0.06 0.13 0.20 1.50 100 2.4 2 0.5 35
0.3 0.4 2.0
Output Current Shutdown Pin
q q q q q
15 0.8 4 50 70 35 55
RL = 1k, Pin 3 = 0.8V
q
25 20 8 24 9.6 60 40 70 120
0.1Hz f 10Hz 10Hz f 1kHz
Long-Term Drift of Output Voltage, SO-8 Package (Note 8) Thermal Hysteresis (Note 9)
See Applications Information T = 0C to 70C T = - 40C to 85C T = - 40C to 125C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1461 is guaranteed functional over the operating temperature range of - 40C to 125C. Note 3: If the part is stored outside of the specified temperature range, the output may shift due to hysteresis. Note 4: ESD (Electrostatic Discharge) sensitive device. Extensive use of ESD protection devices are used internal to the LT1461, however, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. Note 5: Temperature coefficient is calculated from the minimum and maximum output voltage measured at TMIN, Room and TMAX as follows: TC = (VOMAX - VOMIN)/(TMAX - TMIN) Incremental slope is also measured at 25C. Note 6: Load regulation is measured on a pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 7: Peak-to-peak noise is measured with a single pole highpass filter at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a stillair environment to eliminate thermocouple effects on the leads. The test time is 10 sec. RMS noise is measured with a single pole highpass filter at
10Hz and a 2-pole lowpass filter at 1kHz. The resulting output is full-wave rectified and then integrated for a fixed period, making the final reading an average as opposed to RMS. A correction factor of 1.1 is used to convert from average to RMS and a second correction of 0.88 is used to correct for the nonideal bandpass of the filters. Note 8: Long-term drift typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. Total drift in the second thousand hours is normally less than one third that of the first thousand hours with a continuing trend toward reduced drift with time. Long-term drift will also be affected by differential stresses between the IC and the board material created during board assembly. See the Applications Information section. Note 9: Hysteresis in output voltage is created by package stress that depends on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25C, but the IC is cycled hot or cold before successive measurements. Hysteresis is roughly proportional to the square of the temperature change. Hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. See Applications Information.
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LT1461-2.5 TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs Temperature
2.5020
OUTPUT VOLTAGE CHANGE (mV)
2.5015
REFERENCE VOLTAGE (V)
TEMPCO -60C TO 120C 3 TYPICAL PARTS
2.5010 2.5005 2.5000 2.4995 2.4990 2.4985 2.4980 - 60 - 40 - 20 0 20 40 60 80 100 120 TEMPERATURE (C)
1461 G01
3 125C 25C 2
LINE REGULATION (ppm/V)
Minimum Input/Output Voltage Differential vs Load Current
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INPUT/OUTPUT VOLTAGE (V)
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
1
- 55C 0.1 0.1 1 10 OUTPUT CURRENT (mA) 100
1461 G04
Current Limit vs Temperature
140 200 180
SHDN PIN CURRENT (A)
120
CURRENT LIMIT (mA)
160 140 120 100 80 60 40 20 25C 125C - 55C
RIPPLE REJECTION RATIO (dB)
100
80
60
40 -50 -25
50 25 0 75 TEMPERATURE (C)
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UW
125C 25C
Load Regulation
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Line Regulation vs Temperature
0 -1 -2 -3 -4 -5 -6 -7 SUPPLY = 15V 5V - 20V 0 20 40 60 80 TEMPERATURE (C) 100 120
1461 G03
1 - 55C 0 0.1
1 10 OUTPUT CURRENT (mA)
100
1461 G02
-8 -40 - 20
Supply Current vs Input Voltage
1000
50
Supply Current vs Temperature
VIN = 5V 40 IS IS(SHDN) 30
100 125C - 55C 25C
20
10
10 0 5 10 15 20 INPUT VOLTAGE (V) 25
1461 G05
0 - 40 -20
0
20 40 60 80 TEMPERATURE (C)
100 120
1461 G06
SHDN Pin Current vs SHDN Input Voltage
100 90 80 70 60 50 40 30 20 10
Ripple Rejection Ratio vs Frequency
0 100 125 0 15 10 5 SHDN PIN INPUT VOLTAGE (V) 20
1461 G08
0 0.01
0.1
1 10 FREQUENCY (kHz)
100
1000
1641 G01
1461 G07
LT1461-2.5 TYPICAL PERFORMANCE CHARACTERISTICS
Output Impedance vs Frequency
1000 COUT = 2F
OUTPUT IMPEDANCE ()
VOLTAGE (V)
10
2 VOUT 1 0 CIN = 1F CL = 2F RL = TIME (100s/DIV)
1461 G11
VOLTAGE (V)
100
COUT = 1F
1 0.01
0.1 1 FREQUENCY (kHz)
Transient Response to 10mA Load Step
IOUT 0mA 10mA/DIV 5V 4V
VOUT 50mV/DIV
VOUT 50mV/DIV
CL = 2F
1461 G13
CIN = 0.1F
1461 G14
OUTPUT NOISE (20V/DIV)
250 200 150
ppm
100 50 0 -50 0 200 400 600 800 1000 HOURS 1200 1400 1600 1800 2000
1461 G15
UW
10
1461 G10
Turn-On Time
20 10 0 VIN
20 10 0
Turn-On Time
VIN
2 VOUT 1 0 CIN = 1F CL = 2F RL = 50 TIME (100s/DIV)
1461 G12
Line Transient Response
Output Noise 0.1Hz f 10Hz
VIN
TIME (2SEC/DIV)
1461 G18
Long-Term Drift (Number of Data Points Reduced at 650 Hours)*
LT1461S8-2.5 3 TYPICAL PARTS SOLDERED ONTO PCB TA = 30C
*SEE APPLICATIONS INFORMATION FOR DETAILED EXPLANATION OF LONG-TERM DRIFT
5
LT1461-2.5 TYPICAL PERFORMANCE CHARACTERISTICS
0C to 70C Hysteresis
20 18 16
NUMBER OF UNITS
14 12 10 8 6 4 2 0 -100 - 80 - 60
20 18 16 WORST-CASE HYSTERESIS ON 35 UNITS
NUMBER OF UNITS
14 12 10 8 6 4 2 0 -100 - 80 - 60 - 40 - 20 0 20 HYSTERESIS (ppm) 40 60 80 100
1461 G17
16 14 12 WORST-CASE HYSTERESIS ON 35 UNITS 125C TO 25C
NUMBER OF UNITS
10 8 6 4 2 0 -200 -160 -120 -80 -40 0 40 HYSTERESIS (ppm) 80 120 160 200
1461 G19
6
UW
WORST-CASE HYSTERESIS ON 35 UNITS
70C TO 25C
0C TO 25C
- 40
- 20 0 20 HYSTERESIS (ppm)
40
60
80
100
1461 G16
- 40C to 85C Hysteresis
85C TO 25C
- 40C TO 25C
- 40C to 125C Hysteresis
- 40C TO 25C
LT1461-2.5
APPLICATIONS INFORMATION
Bypass and Load Capacitors The LT1461 requires a capacitor on the input and on the output for stability. The capacitor on the input is a supply bypass capacitor and if the bypass capacitors from other components are close (within 2 inches) they should be sufficient. The output capacitor acts as frequency compensation for the reference and cannot be omitted. For light loads 1mA, a 1F nonpolar output capacitor is usually adequate, but for higher loads (up to 75mA), the output capacitor should be 2F or greater. Figures 1 and 2 show the transient response to a 1mA load step with a 1F output capacitor and a 50mA load step with a 2F output capacitor. load current or input voltage changes, is not measurable. This often overlooked parameter must be added to normal line and load regulation errors. The load regulation photo, on the first page of this data sheet, shows the output response to 200mW of instantaneous power dissipation and the reference shows no sign of thermal errors. The reference has thermal shutdown and will turn off if the junction temperature exceeds 150C. Shutdown The shutdown (Pin 3 low) serves to shut off load current when the LT1461 is used as a regulator. The LT1461 operates normally with Pin 3 open or greater than or equal to 2.4V. In shutdown, the reference draws a maximum supply current of 35A. Figure 3 shows the transient response of shutdown while the part is delivering 25mA. After shutdown, the reference powers up in about 200s.
IOUT 0mA 1mA/DIV 1mA
VOUT 20mV/DIV
1461 F01
Figure 1. 1mA Load Step with CL = 1F
IOUT 50mA/DIV VOUT 200mV/DIV
1461 F02
Figure 2. 50mA Load Step with CL = 2F
Precision Regulator The LT1461 will deliver 50mA with VIN = VOUT + 2.5V and higher load current with higher VIN. Load regulation is typically 12ppm/mA, which means for a 50mA load step, the output will change by only 1.5mV. Thermal regulation, caused by die temperature gradients and created from
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5V PIN 3 0V
VOUT 0V
1461 F03
Figure 3. Shutdown While Delivering 25mA, RL = 100
PC Board Layout In 13- to 16-bit systems where initial accuracy and temperature coefficient calibrations have been done, the mechanical and thermal stress on a PC board (in a card cage for instance) can shift the output voltage and mask the true temperature coefficient of a reference. In addition, the mechanical stress of being soldered into a PC board can cause the output voltage to shift from its ideal value. Surface mount voltage references are the most susceptible to PC board stress because of the small amount of plastic used to hold the lead frame. A simple way to improve the stress-related shifts is to mount the reference near the short edge of the PC board, or in a corner. The board edge acts as a stress boundary,
7
LT1461-2.5
APPLICATIONS INFORMATION
or a region where the flexure of the board is minimum. The package should always be mounted so that the leads absorb the stress and not the package. The package is generally aligned with the leads parallel to the long side of the PC board as shown in Figure 5a. A qualitative technique to evaluate the effect of stress on voltage references is to solder the part into a PC board and deform the board a fixed amount as shown in Figure 4. The flexure #1 represents no displacement, flexure #2 is concave movement, flexure #3 is relaxation to no displacement and finally, flexure #4 is a convex movement.
1 2 3 4
1461 F04
Figure 4. Flexure Numbers
2
OUTPUT DEVIATION (mV)
1
OUTPUT DEVIATION (mV)
0
LONG DIMENSION
-1 0 10 20 FLEXURE NUMBER 30 40
1461 F05a
Figure 5a. Two Typical LT1461S8-2.5s, Vertical Orientation Without Slots
2
OUTPUT DEVIATION (mV)
1
OUTPUT DEVIATION (mV)
0
LONG DIMENSION
-1 0 10 20 FLEXURE NUMBER 30 40
1461 F05b
Figure 5b. Two Typical LT1461S8-2.5s, Horizontal Orientation Without Slots
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This motion is repeated for a number of cycles and the relative output deviation is noted. The result shown in Figure 5a is for two LT1461S8-2.5s mounted vertically and Figure 5b is for two LT1461S8-2.5s mounted horizontally. The parts oriented in Figure 5a impart less stress into the package because stress is absorbed in the leads. Figures 5a and 5b show the deviation to be between 125V and 250V and implies a 50ppm and 100ppm change respectively. This corresponds to a 13- to 14-bit system and is not a problem for most 10- to 12-bit systems unless the system has a calibration. In this case, as with temperature hysteresis, this low level can be important and even more careful techniques are required. The most effective technique to improve PC board stress is to cut slots in the board around the reference to serve as a strain relief. These slots can be cut on three sides of the reference and the leads can exit on the fourth side. This "tongue" of PC board material can be oriented in the long direction of the board to further reduce stress transferred to the reference.
2
1
0 SLOT -1 0 10 20 FLEXURE NUMBER 30 40
1461 F06a
Figure 6a. Same Two LT1461S8-2.5s in Figure 5a, but with Slots
2
1
0 SLOT -1 0 10 20 FLEXURE NUMBER 30 40
1461 F06b
Figure 6b. Same Two LT1461S8-2.5s in Figure 5b, but with Slots
LT1461-2.5
APPLICATIONS INFORMATION
The results of slotting the PC boards of Figures 5a and 5b are shown in Figures 6a and 6b. In this example the slots can improve the output shift from about 100ppm to nearly zero. Long-Term Drift Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are wildly optimistic. The only way long-term drift can be determined is to measure it over the time interval of interest. The erroneous technique uses the Arrhenius Equation to derive an acceleration factor from elevated temperature readings. The equation is:
EA 1 1 - = e K T 1 T 2
AF
where: EA = Activation Energy (Assume 0.7) K = Boltzmann's Constant T2 = Test Condition in Kelvin T1 = Use Condition Temperature in Kelvin To show how absurd this technique is, compare the LT1461 data. Typical 1000 hour long-term drift at 30C = 60ppm. The typical 1000 hour long-term drift at 130C = 120ppm. From the Arrhenius Equation the acceleration factor is:
FLUKE 732A LABORATORY REFERENCE
AF
1 0.7 1 - 0.0000863 303 403 =e
= 767
The erroneous projected long-term drift is: 120ppm/767 = 0.156ppm/1000 hr For a 2.5V reference, this corresponds to a 0.39V shift after 1000 hours. This is pretty hard to determine (read impossible) if the peak-to-peak output noise is larger than this number. As a practical matter, one of the best laboratory references available is the Fluke 732A and its longterm drift is 1.5V/mo. This performance is only available from the best subsurface zener references utilizing specialized heater techniques.
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The LT1461 long-term drift data was taken with parts that were soldered onto PC boards similar to a "real world" application. The boards were then placed into a constant temperature oven with TA = 30C, their outputs were scanned regularly and measured with an 8.5 digit DVM. As an additional accuracy check on the DVM, a Fluke 732A laboratory reference was also scanned. Figure 7 shows the long-term drift measurement system. The long-term drift is the trend line that asymptotes to a value beyond 2000 hours. Note the slope in output shift between 0 hours and 1000 hours compared to the slope between 1000 hours and 2000 hours. Long-term drift is affected by differential stresses between the IC and the board material created during board assembly.
PCB3 PCB2 PCB1 SCANNER 8.5 DIGIT DVM COMPUTER
1461 F07
Figure 7. Long-Term Drift Measurement Setup
Hysteresis The hysteresis curves found in the Typical Performance Characteristics represent the worst-case data taken on 35 typical parts after multiple temperature cycles. As expected, the parts that are cycled over the wider - 40C to 125C temperature range have more hysteresis than those cycled over lower ranges. Note that the hysteresis coming from 125C to 25C has an influence on the - 40C to 25C hysteresis. The - 40C to 25C hysteresis is different depending on the part's previous temperature. This is because not all of the high temperature stress is relieved during the 25C measurement.
9
LT1461-2.5
APPLICATIONS INFORMATION
The typical performance hysteresis curves are for parts mounted in a socket and represents the performance of the parts alone. What is more interesting are parts IR soldered onto a PC board. If the PC board is then temperature cycled several times from - 40C to 85C, the resulting hysteresis curve is shown in Figure 8. This graph shows the influence of the PC board stress on the reference. When the LT1461 is soldered onto a PC board, the output shifts due to thermal hysteresis. Figure 9 shows the effect of soldering 40 pieces onto a PC board using standard IR reflow techniques. The average output voltage shift is -110ppm. Remeasurement of these parts after 12 days shows the outputs typically shift back 45ppm toward their initial value. This second shift is due to the relaxation of stress incurred during soldering.
12 11 10 9 WORST-CASE HYSTERESIS ON 35 UNITS 85C TO 25C - 40C TO 25C
NUMBER OF UNITS
8 7 6 5 4 3 2 1 0 - 200 -160 -120 - 80 - 40 0 40 HYSTERESIS (ppm) 80 120 160 200
1461 F08
Figure 8. - 40C to 85C Hysteresis of 35 Parts Soldered Onto a PC Board
12 10 NUMBER OF UNITS 8 6 4 2 0 -300
Figure 9. Typical Distribution of Output Voltage Shift After Soldering Onto PC Board
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The LT1461 is capable of dissipating high power, i.e., 17.5V * 50mA = 875mW. The SO-8 package has a thermal resistance of 190C/W and this dissipation causes a 166C internal rise producing a junction temperature of TJ = 25C + 166C = 191C. What will actually occur is the thermal shutdown will limit the junction temperature to around 150C. This high temperature excursion will cause the output to shift due to thermal hysteresis. Under these conditions, a typical output shift is -135ppm, although this number can be higher. This high dissipation can cause the 25C output accuracy to exceed its specified limit. For best accuracy and precision, the LT1461 junction temperature should not exceed 125C.
200 0 100 -200 -100 OUTPUT VOLTAGE SHIFT (ppm)
300
1461 F09
LT1461-2.5
SI PLIFIED SCHE ATIC
2 VIN
SHDN 3
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016 - 0.050 (0.406 - 1.270)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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6 VOUT
4 GND
1461 SS
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.050 (1.270) BSC
SO8 1298
11
LT1461-2.5
TYPICAL APPLICATION
Low Power 16-Bit A/D
VCC 35A VCC LT1461-2.5 VOUT 1F GND INPUT 0.1F VCC FO LTC2400 VREF SCK SD0 CS VIN GND
1461 TA03
RELATED PARTS
PART NUMBER LT1019 LT1027 LT1236 LTC 1798 LT1460 LT1634
(R)
DESCRIPTION Precision Reference Precision 5V Reference Precision Reference Micropower Low Dropout Reference Micropower Precision Series Reference Micropower Precision Shunt Voltage Reference
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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200A
1F
SPI INTERFACE
NOISE PERFORMANCE* VIN = 0V, VNOISE = 1.1ppmRMS = 2.25VRMS = 16VP-P VIN = VREF/2, VNOISE = 1.6ppmRMS = 4VRMS = 24VP-P VIN = VREF, VNOISE = 2.5ppmRMS = 6.25VRMS = 36VP-P *FOR 24-BIT PERFORMANCE USE LT1236 REFERENCE
COMMENTS Bandgap, 0.05%, 5ppm/C Lowest TC, High Accuracy, Low Noise, Zener Based 5V and 10V Zener-Based 5ppm/C, SO-8 Package 0.15% Max, 6.5A Supply Current Bandgap, 130A Supply Current 10ppm/C, Available in SOT-23 Bandgap 0.05%, 10ppm/C, 10A Supply Current
146125f LT/TP 0100 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1999

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