LM334Z#PBF [Linear]
LM334S - Constant Current Source and Temperature Sensor; Package: TO-92; Pins: 3; Temperature Range: 0°C to 70°C;
| 型号： | LM334Z#PBF |
| 厂家： | 
Linear |
| 描述： | LM334S - Constant Current Source and Temperature Sensor; Package: TO-92; Pins: 3; Temperature Range: 0°C to 70°C 传感器 换能器 |
| 文件： | 总12页 (文件大小：158K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM134 Series
Constant Current Source
and Temperature Sensor
U
FEATURES
DESCRIPTIO
■
1µA to 10mA Operation
The LM134 is a three-terminal current source designed to
operate at current levels from 1µA to 10mA, as set by an
external resistor. The device operates as a true two-
terminalcurrentsource, requiringnoextrapowerconnec-
tions or input signals. Regulation is typically 0.02%/V and
terminal-to-terminal voltage can range from 800mV to
40V.
■
0.02%/V Regulation
■
0.8V to 40V Operating Voltage
■
Can be Used as Linear Temperature Sensor
■
Draws No Reverse Current
■
Supplied in Standard Transistor Packages
U
Because the operating current is directly proportional to
absolute temperature in degrees Kelvin, the device will
also find wide applications as a temperature sensor. The
temperature dependence of the operating current is
0.336%/°C at room temperature. For example, a device
operating at 298µA will have a temperature coefficient of
1µA/°C. The temperature dependence is extremely accu-
rate and repeatable. Devices specified as temperature
sensors in the 100µA to 1mA range are the LM134-3,
LM234-3 and the LM134-6, LM234-6, with the dash
numbers indicating ±3°C and ±6°C accuracies, respec-
tively.
APPLICATIO S
■
Current Mode Temperature Sensing
■
Constant Current Source for Shunt References
■
Cold Junction Compensation
■
Constant-Gain Bias for Bipolar Differential Stage
■
Micropower Bias Networks
■
Buffer for Photoconductive Cell
■
Current Limiter
If a zero temperature coefficient current source is re-
quired, this is easily achieved by adding a diode and a
resistor.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Remote Temperature Sensor with Voltage Output
Operating Current vs Temperature
225
125
25
500
400
300
200
100
0
V
IN
≥ 5V
+
V
V
R
SET
= 226Ω
R
R
SET
10mV/°K
–75
–175
–275
–
226Ω
LM234-3
R1
10k
TA01a
0
100
200
300
400
500
OPERATING CURRENT (µA)
TA01b
1
LM134 Series
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
V+ to V– Forward Voltage
Power Dissipation.............................................. 200mW
Operating Temperature Range
LM134 (OBSOLETE) ................... –55°C to 125°C
LM234-3/LM234-6 ............................–25°C to 100°C
LM334 ..................................................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
LM134 ................................................................. 40V
LM134-3/LM134-6/LM234-3/
LM234-6/LM334 ................................................. 30V
V+ to V– Reverse Voltage ........................................ 20V
R Pin to V– Voltage.................................................... 5V
Set Current ........................................................... 10mA
U
W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
ORDER PART
BOTTOM VIEW
NUMBER
NUMBER
BOTTOM VIEW
+
V
–
V
CURRENT
SOURCE
TEMP
SENSOR
CURRENT
SOURCE
TEMP
SENSOR
R
+
–
V
R
V
LM134H
LM334H
LM134H-3
LM234H-3
LM134H-6
LM234H-6
LM334Z
LM234Z-3
LM234Z-6
H PACKAGE
Z PACKAGE
3-LEAD TO-46 METAL CAN
3-LEAD PLASTIC TO-92
TJMAX = 150°C, θJA = 440°C/W, θJA = 80°C/W
TJMAX = 100°C, θJA = 160°C/W
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
ORDER PART
NUMBER
–
V
1
2
3
4
8
7
6
5
NC
NC
NC
NC
LM334S8
R
+
V
S8 PART
MARKING
NC
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 180°C/W
334
Consult LTC Marketing for availability of LM234Z-3 and LM234Z-6
2
LM134 Series
ELECTRICAL CHARACTERISTICS
CURRENT SOURCE (Note 2)
LM134
TYP
LM334
TYP
SYMBOL
∆I
PARAMETER
CONDITIONS
10µA ≤ I ≤ 1mA
MIN
MAX
MIN
MAX
UNITS
+
Set Current Error, V = 2.5V
(Note 3)
3
5
8
6
8
12
%
%
%
SET
SET
1mA < I ≤ 5mA
SET
2µA ≤ I < 10µA
SET
Ratio of Set Current to
V Current
10µA ≤ I ≤ 1mA
14
18
14
18
23
14
18
14
18
26
SET
–
1mA ≤ I
≤ 5mA
SET
2µA ≤ I ≤ 10µA
23
26
SET
V
Minimum Operating Voltage
2µA ≤ I ≤ 100µA
0.8
0.9
1.0
0.8
0.9
1.0
V
V
V
MIN
SET
100µA < I
≤ 1mA
SET
1mA < I ≤ 5mA
SET
+
∆I
∆V
Average Change in Set Current
with Input Voltage
1.5V ≤ V ≤ 5V
0.02
0.05
0.03
0.02
0.1
%/V
SET
2µA ≤ I ≤ 1mA
IN
SET
+
5V ≤ V ≤ V
(Note 5)
0.01
0.03
0.01
0.03
0.05
%/V
%/V
MAX
1.5V ≤ V ≤ 5V
1mA < I ≤ 5mA
SET
5V ≤ V ≤ V
(Note 5)
0.02
0.02
%/V
MAX
Temperature Dependence of
Set Current (Note 4)
25µA ≤ I ≤ 1mA
0.96
1.04
0.96
1.04
SET
C
Effective Shunt Capacitance
15
15
pF
S
TEMPERATURE SENSOR (Note 2)
LM134-3,LM234-3
LM134-6, LM234-6
SYMBOL
∆I
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
+
Set Current Error, V = 2.5V
(Note 3)
100µA ≤ I ≤ 1mA
±1
±2
%
SET
SET
T = 25°C
j
Equivalent Temperature Error
Ratio of Set Current to
V Current
±3
±6
°C
100µA ≤ I ≤ 1mA
14
18
26
14
18
26
SET
–
V
Minimum Operating Voltage
100µA ≤ I ≤ 1mA
0.9
0.9
V
MIN
SET
+
∆I
∆V
Average Change in Set Current
with Input Voltage
1.5V ≤ V ≤ 5V
0.02
0.05
0.02
0.1
%/V
SET
100µA ≤ I ≤ 1mA
5V ≤ V ≤ 30V
IN
SET
+
0.01
0.03
1.02
0.01
0.05
1.03
%/V
Temperature Dependence of
Set Current (Note 4)
100µA ≤ I ≤ 1mA
0.98
0.97
SET
Equivalent Slope Error
±2
±3
%
C
Effective Shunt Capacitance
15
15
pF
S
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
is expressed as a percent deviation from this amount. I increases at
SET
0.336%/°C at T = 25°C.
j
Note 2: Unless otherwise specified, tests are performed at T = 25°C with
Note 4: I is nominally directly proportional to absolute temperature
SET
j
pulse testing so that junction temperature does not change during test.
(°K). I
at any temperature can be calculated from: I = I (T/T )
SET SET O O
+
where I is I
measured at T (°K).
O
O
SET
Note 3: Set current is the current flowing into the V pin. It is determined
by the following formula: I = 67.7mV/R (at 25°C). Set current error
Note 5: V
= 40V for LM134 and 30V for other grades.
SET
SET
MAX
3
LM134 Series
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Slew Rate for
Linear Operation
Start-Up
Output Impedance
9
8
7
6
10
10
10
10
10
10µA
0µA
I = 10µA
200µs
1.0
100µA
0µA
50µs
5µs
I = 100µA
0.1
1mA
0mA
5V
0.01
I = 1mA
INPUT
0.001
0V
10
100
1k
10k
1
10
100
(µA)
1000
10000
TIME
FREQUENCY (Hz)
I
(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)
SET
134 G02
134 G01
134 G03
Current Noise
Voltage Across RSET
Transient Response
86
82
78
74
70
66
62
58
54
50
46
2
10k
2µs
1
0
I
= 1mA
SET
1k
100
10
+
–
V
TO V = 5V
∆V = 0.4V
t , = 500ns
–1
5
I
I
= 5mA
= 1mA
SET
SET
r
f
0
I
= 100µA
10µs
50µs
SET
I
= 100µA
= 10µA
–5
10
0
SET
I
SET
I
= 10µA
SET
–10
–20
1
TIME
–50
0
25
50
75 100 125
–25
10
100
1k
10k
100k
(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)
TEMPERATURE (°C)
FREQUENCY (Hz)
134 G06
134 G04
1314/15 G01
Operating Current vs
Temperature
Ratio of ISET to V– Current
Turn-On Voltage
225
500
400
300
200
100
0
21
20
19
18
17
16
15
14
13
12
11
10mA
T = 25°C
j
R
SET
= 226Ω
R
R
= 14Ω
= 68Ω
SET
SET
125
25
1mA
100µA
10µA
R
= 680Ω
SET
R
–75
–175
–275
= 6.8k
SET
1µA
0
100
200
300
400
500
10µA
100µA
1mA
10mA
0.4
0.6
0.8
1.0
1.2
1.4
+
–
I
V
TO V VOLTAGE
OPERATING CURRENT (µA)
SET
134 G08
134 G02
134 G09
4
LM134 Series
U
W U U
APPLICATIO S I FOR ATIO
Basic Theory of Operation
the device is ±2% when the room temperature current is
set to the exact desired value.
The equivalent circuit of the LM134 is shown in Figure 1.
A reference voltage of 64mV is applied to the minus input
of A1 with respect to the V– pin. A1 serves the drive to Q2
to keep the R pin at 64mV, independent of the value of
Supply Voltage Slew Rate
At slew rates above a given threshold (see curve), the
LM134 may exhibit nonlinear current shifts. The slewing
rate at which this occurs is directly proportional to ISET. At
ISET = 10µA, maximum dv/dt is 0.01V/µs; at ISET = 1mA,
the limits is 1V/µs. Slew rates above the limit do not harm
the LM134, or cause large currents to flow.
R
SET. Transistor Q1 is matched to Q2 at a 17:1 ratio so that
the current flowing out of the V– pin is always 1/18 of the
total current into the V+ pin. This total current is called ISET
and is equal to:
64mV 18
RSET 17
67.7mV
RSET
=
Thermal Effects
Internal heating can have a significant effect on current
regulation for ISET greater than 100µA. For example, each
1V increase across the LM134 at ISET = 1mA will increase
junction temperature by ≈0.4°C in still air. Output current
(ISET) has a temperature coefficient of ≈0.33%/°C, so the
changeincurrentduetotemperaturerisewillbe(0.4)(0.33)
= 0.132%. This is a 10:1 degradation in regulation com-
pared to true electrical effects. Thermal effects, therefore,
must be taken into account when DC regulation is critical
and ISET exceeds 100µA. Heat sinking of the TO-46 pack-
age or the TO-92 leads can reduce this effect by more than
3:1.
+
V
I
SET
Q1
Q2
+
–
R
R
V
A1
+
–
SET
–
64mV
134 F01
Figure 1.
Shunt Capacitance
The 67.7mV equivalent reference voltage is directly pro-
portional to absolute temperature in degrees Kelvin (see
curve, “Operating Current vs Temperature”). This means
that the reference voltage can be plotted as a straight line
going from 0mV at absolute zero temperature to 67.7mV
at 298°K (25°C). The slope of this line is 67.7mV/298 =
227µV/°C.
In certain applications, the 15pF shunt capacitance of the
LM134 may have to be reduced, either because of loading
problems or because it limits the AC output impedance of
the current source. This can be easily accomplished by
buffering the LM134 with a FET, as shown in the applica-
tions. This can reduce capacitance to less than 3pF and
improve regulation by at least an order of magnitude. DC
characteristics (with the exception of minimum input
voltage) are not affected.
The accuracy of the device is specified as a percent error
at room temperature, or in the case of the -3 and -6
devices, as both a percent error and an equivalent tem-
perature error. The LM134 operating current changes at a
percentrateequalto(100)(227µV/°C)/(67.7mV)=0.336%/
°C at 25°C, so each 1% operating current error is equiva-
lent to ≈3°C temperature error when the device is used as
a temperature sensor. The slope accuracy (temperature
coefficient) of the LM134 is expressed as a ratio com-
pared to unity. The LM134-3, for instance, is specified at
0.98 to 1.02, indicating that the maximum slope error of
Noise
Current noise generated by the LM134 is approximately 4
times the shot noise of a transistor. If the LM134 is used
as an active load for a transistor amplifier, input referred
noise will be increased by about 12dB. In many cases, this
is acceptable and a single stage amplifier can be built with
a voltage gain exceeding 2000.
5
LM134 Series
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W U U
APPLICATIO S I FOR ATIO
Lead Resistance
voltage across the 10k resistor will be 2.98V at 25°C, with
a slope of 10mV/°C. The simplest way to convert this
signal to a Centigrade scale is to subtract a constant 2.73V
in software. Alternately, a hardware conversion can be
used, as shown in Figure 3, using an LT1009 as a level
shifter to offset the output to a Centigrade scale.
The sense voltage which determines the operating current
of the LM134 is less than 100mV. At this level, thermo-
couple or lead resistance effects should be minimized by
locating the current setting resistor physically close to the
device. Sockets should be avoided if possible. It takes only
0.7Ω contact resistance to reduce output current by 1% at
the 1mA level.
The resistor (RSET) used to set the operating current of the
LM134 in temperature sensing applications should have
low temperature coefficient and good long term stability.
A30ppm/°Cdriftintheresistorwillchangetheslopeofthe
temperature sensor by 1%, assuming that the resistor is
atthesametemperatureasthesensor,whichisusuallythe
case since the resistor should be located physically close
to the LM134 to prevent errors due to wire resistance. A
long term shift of 0.3% in the resistor will create a 1°C
temperature error. The long term drift of the LM134 is
typicallymuchbetterthanthis, sostableresistorsmustbe
used for best long term performance.
Start-Up Time
The LM134 is designed to operate at currents as low as
1µA. This requires that internal biasing current be well
below that level because the device achieves its wide
operating current range by using part of the operating
current as bias current for the internal circuitry. To ensure
start-up, however, a fixed trickle current must be provided
internally. This is typically in the range of 20nA to 200nA
and is provided by the special ultralow IDDS FETs shown in
the Schematic Diagrams as Q7 and Q8. The start-up time
of the LM134 is determined by the IDSS of these FETs and
the capacitor C1. This capacitor must charge to approxi-
mately 500mV before Q3 turns on to start normal circuit
operation. This takes as long as (500mV)(50pF)/(20nA) =
1.25ms for very low IDSS values.
Calibration of the LM134 as a temperature sensor is
extremelyeasy.ReferringtoFigure2,calibrationisachieved
by trimming the termination resistor. This theoretically
trims both zero and slope simultaneously for Centigrade
andFahrenheitapplications.TheinitialerrorsintheLM134
are directly proportional to absolute temperature, just like
the actual output. This allows the sensor to be trimmed at
any temperature and have the slope error be corrected at
the same time. Residual slope error is typically less than
1% after this single trim is completed.
Using the LM134 as a Temperature Sensor
Because it has a highly linear output characteristic, the
LM134makesagoodtemperaturesensor. Itisparticularly
useful in remote sensing applications because it is a
current output device and is therefore not affected by long
wire runs. It is easy to calibrate, has good long term
stability and can be interfaced directly with most data
acquisition systems, eliminating the expensive preampli-
fiers required for thermocouples and platinum sensors.
V
S
≥ 5V
+
V
V
LM234-3
R
TO DATA
ACQUISITION
SYSTEM
R
SET
–
226Ω
10mV/°K
I = 1µA/°K
9.53k
1k
A typical temperature sensor application is shown in
Figure 2. The LM134 operating current at 25°C is set at
298µA by the 226Ω resistor, giving an output of 1µA/°K.
The current flows through the twisted pair sensor leads to
the 10k termination resistor, which converts the current
output to a voltage of 10mV/°K referred to ground. The
CALIBRATE
134 F02
Figure 2 Kelvin Temperature Sensor
6
LM134 Series
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W U U
APPLICATIO S I FOR ATIO
If higher accuracy is required, a two point calibration
techniquecanbeused.InFigure4,separatezeroandslope
trims are provided. Residual nonlinearity is now the limi-
tation on accuracy. Nonlinearity of the LM134 in a 100°C
span is typically less than 0.5°C. This particular method of
trimming has the advantage that the slope trim does not
interact with the zero trim. Trim procedure is to adjust for
zero output with TSENSOR = 0°C, then trim slope for proper
output at some convenient second temperature. No fur-
ther trimming is required.
The two trims shown in Figure 3 are still intended to be a
“one point” temperature calibration, where the zero and
theslopearetrimmedatasingletemperature. TheLT1009
referenceisadjustedtogive2.700Vatnode“a”atTSENSOR
= 25°C. The 1k trimmer then adjusts the output for 0.25V,
completing the calibration. If the calibration is to be done
at a temperature other than 25°C , trim the LT1009 for
2.7025—(1µA)[TSENSOR (°C)](100Ω) at node “a”, then
adjust the 1k trimmer for proper output.
V
≥ 4V
S
+
+
V
≥ 5V
V
LM134-3
R
+
V
LM134-3
R
R
OUTPUT
SET
–
226Ω
10mV/°C
V
9.53k
OUTPUT
226Ω*
–
1%
10mV/°C
V
332k
1%
11k*
1%
1k
SLOPE
ADJ
50k
SLOPE
TRIM
500k
*LOW TC, STABLE RESISTOR
LT1009
ZERO
TRIM
10k
15k
LT1009
100Ω
“a”
10k
–15V
134 F04
134 F03
10k
ZERO
ADJ
–15V
Figure 4. Centigrade Temperature Sensor with 2 Point Trim
Figure 3. Centigrade Temperature Sensor
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TYPICAL APPLICATIO S
Basic 2-Terminal
Zero Temperature
Coefficient Current Source
Low Output Impedance
Thermometer (Kelvin Output)
Current Source
V
IN
V
IN
V
IN
≥ 4.8V
+
I
+
–
+
+
V
V
V
R3*
600Ω
R
R
R
V
= 10mV/°K
≤ 100Ω
I
OUT
OUT
SET
Z
R1
230Ω
1%
R
SET
–
–
V
LM334
LM334
LM334
V
V
R
SET
R2
10k
1%
C1
0.1µF
D1
1N457
R1*
≈10 R
134 TA02
SET
–V
IN
134 TA03
–V
IN
134 TA04
*SELECT RATIO OF R1 TO R
TO
SET
+
*OUTPUT IMPEDANCE OF THE LM134 AT THE “R” PIN IS
OBTAIN ZERO DRIFT. I ≈2 I
.
SET
–R
O
APPROXIMATELY
Ω, WHERE R IS THE EQUIVALENT
O
16
–
EXTERNAL RESISTANCE CONNECTED TO THE V PIN. THIS
NEGATIVE RESISTANCE CAN BE REDUCED BY A FACTOR OF
5 OR MORE BY INSERTING AN EQUIVALENT RESISTOR IN
SERIES WITH THE OUTPUT.
7
LM134 Series
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TYPICAL APPLICATIO S
Higher Output Current
Low Input Voltage Reference Driver
Low Output Impedance Thermometer
V
IN
≥ V
REF
+ 200mV
V
V
IN
IN
R1
1.5k
R1
15k
R2
300Ω
2N2905
R1*
C1
0.1
Q1
2N4250
2N4250
+
+
V
V
= V + 64mV AT 25°C
V
OUT
Z
C1*
+
V
V
+
Z
–
I
≤ 3mA
OUT
LT1009
V
Z
= 10mV/°K
≤ 2Ω
OUT
OUT
V
R
R
C1
0.0022
R
LM334
R3
100Ω
R
SET
–
–
R2
120Ω
LM334
V
LM334
V
–
R4
4.5k
–V
TA05
IN
TA07
*SELECT R1 AND C1 FOR OPTIMUM STABILITY
TA06
Micropower Bias
Zener Biasing
1.2V Regulator with 1.8V Minimum Input
V
≥ 1.8V
IN
V
IN
100k
V
IN
2N4250
V
C1
0.001
+
V
R1
33k
= 1.2V
≤ 200µA
LM4250
OUT
I
OUT
R
LM334
1N457**
1µA
+
R
SET
+
R1*
≈6k
1%
V
–
V
V
R
SET
V
OUT
68k
R
R
LM134**
LM334
V
Z
R2*
680Ω
1%
–
–
V
V
TA10
TA09
TA08
*
SELECT RATIO OF R1 TO R2 FOR ZERO TEMPERATURE DRIFT
LM134 AND DIODE SHOULD BE ISOTHERMAL
–V
IN
**
Buffer for Photoconductive Cell
Alternate Trimming Technique
High Precision Low TC Current Source
+
I
≥ 50µA
SET
V
IN
+
V
+
–
V
R
LM334
+
R
V
LM334
–
V
R
R
SET
1.5V
V
LM334
R1*
R1
6.8k
LT1004-1.2
(1.235V)
–
R2*
V
TA11
TA12
TA13
–V
IN
–
*FOR ±10% ADJUSTMENT, SELECT R
10% HIGH AND MAKE R1 ≈ 3R
1.37V
R2
SET
*I
=
+ 10µA
SET
SET
I
TC = 0.016%/°C + 33nA/°C
SET
REGULATION ≈ 0.001%/V
8
LM134 Series
U
TYPICAL APPLICATIO S
Precision 10nA Current Source
Micropower 5V Reference
V
IN
= 6.5V TO 15V
15V
V
+
R
LM334
R
LM134
5.6k
R1
–
2.7k
V
7
3
+
–
6
R2
226k
LM4250
V
OUT
= 5V
LT1004-1.2
15V
2
8
LT1004-1.2
(1.235V)
22M
R3
3.01M
1%
4
150pF
1M
2
7
–
1M
1%
BUFFERED
VOLTAGE
OUTPUT
R4
100MΩ
6
LT1008
3
8
TA15
+
I
200pF
O
4
I
Z
= 10nA
12
O
–15V
≥ 10 Ω
O
TA14
COMPLIANCE = –14V TO 12.5V
FET Cascoding for Low Capacitance
and/or Ultrahigh Output Impedance
V
IN
V
IN
I
SET
+
V
LM334
R
Q1*
V
+
LM334
R
R
SET
–
V
Q2*
R
SET
–
V
I
SET
TA16
–V
–V
IN
IN
*SELECT Q1 OR Q2 TO ENSURE AT LEAST 1V
ACROSS THE LM134. V (1 – I /I ) ≥ 1.2V.
P
SET DSS
W
W
SCHE ATIC DIAGRA
+
V
Q7
Q8
Q4
Q5
Q6
Q3
Q2
Q1
C1
50pF
R
V
–
134 SD
9
LM134 Series
U
PACKAGE DESCRIPTIO
H Package
2-Lead and 3-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1340)
0.100
(2.540)
TYP
0.209 – 0.219
(5.309 – 5.537)
0.178 – 0.195
(4.521 – 4.953)
0.050
(1.270)
TYP
0.050
(1.270)
TYP
0.085 – 0.105
(2.159 – 2.667)
PIN 1
0.500
(12.700)
MIN
FOR 3-LEAD PACKAGE ONLY
REFERENCE
45°
PLANE
0.028 – 0.048
(0.711 – 1.219)
0.036 – 0.046
(0.914 – 1.168)
*
0.025
(0.635)
MAX
H02/03(TO-46) 1098
0.016 – 0.021**
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
(0.406 – 0.533)
DIA
OBSOLETE PACKAGE
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410)
0.180 ± 0.005
(4.572 ± 0.127)
0.060 ± 0.005
(1.524± 0.127)
DIA
0.90
(2.286)
NOM
0.180 ± 0.005
(4.572 ± 0.127)
5°
NOM
0.500
(12.70)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSION
0.016 ± 0.003
0.015 ± 0.002
(0.406 ± 0.076)
(0.381 ± 0.051)
0.050
(1.27)
BSC
Z3 (TO-92) 0401
0.098 +016/–0.04
(2.5 +0.4/–0.1)
2 PLCS
0.060 ± 0.010
(1.524 ± 0.254)
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
0.140 ± 0.010
(3.556 ± 0.127)
10° NOM
10
LM134 Series
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
SO8 1298
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
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
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LM134 Series
U
TYPICAL APPLICATIO S
In-Line Current Limiter
Generating Negative Output Impedance
R
SET
V
IN
R
–
+
V
V
+
–
V
IN
V
R1*
C1*
R
LM334
R
SET
V
LM334
OP AMP
–V
TA18
IN
TA17
*Z
≈ –16 • R1(R1/V MUST NOT EXCEED I ).
IN SET
OUT
*USE MINIMUM VALUE REQUIRED TO
ENSURE STABILITY OF PROTECTED
DEVICE. THIS MINIMIZES INRUSH
CURRENT TO A DIRECT SHORT.
Ground Referred Fahrenheit Thermometer
V
≥ 3V
IN
R4
56k
2N4250
C1
0.01
V
= 10mV/°F
OUT
10°F ≤ T ≤ 250°F
V
IN
R1
8.25k
1%
+
–
V
V
R5**
R
R3*
R2
100Ω
1%
LT1009
2.5V*
LM334
TA19
*SELECT R3 = V /583µA
REF
**SELECT FOR 1.2mA
134sc LT/CP 1001 1.5K REV C • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1991
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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