LINEAR TECHNOLOGY LM134 Technical data

FEATURES

■

1µA to 10mA Operation

■

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

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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

LM134 Series

Constant Current Source

and Temperature Sensor

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DESCRIPTIO

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 two­terminal current source, requiring no extra power connec­tions or input signals. Regulation is typically 0.02%/V and
terminal-to-terminal voltage can range from 800mV to
40V.

Because the operating current is

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, respec­tively.

directly proportional to

, LTC and LT are registered trademarks of Linear Technology Corporation.

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TYPICAL APPLICATIO

Remote Temperature Sensor with Voltage Output

≥ 5V

V

IN

+

V

R

R

SET

226Ω

LM234-3

–

V

R1

10k

10mV/°K

TA01a

If a zero temperature coefficient current source is re­quired, this is easily achieved by adding a diode and a
resistor.

Operating Current vs Temperature

TA01b

500

225

125

TEMPERATURE (°C)

25

–75

–175

–275

500

400

R

= 226Ω

SET

300

200

TEMPERATURE (°K)

100

0

100

0

OPERATING CURRENT (µA)

200

300

400

1

LM134 Series

WW

W

ABSOLUTE AXI U RATI GS

U

(Note 1)

V+ to V– Forward Voltage

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

UUW

PACKAGE/ORDER I FOR ATIO

BOTTOM VIEW

+

V

–

V

R

H PACKAGE

3-LEAD TO-46 METAL CAN

T

= 150°C, θJA = 440°C/W, θJA = 80°C/W

JMAX

ORDER PART

NUMBER

CURRENT

SOURCE

LM134H
LM334H

TEMP

SENSOR

LM134H-3
LM234H-3
LM134H-6
LM234H-6

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

ORDER PART

BOTTOM VIEW

+

V

Z PACKAGE

3-LEAD PLASTIC TO-92

T

= 100°C, θJA = 160°C/W

JMAX

V

R

–

CURRENT

LM334Z

NUMBER

SOURCE

TEMP

SENSOR

LM234Z-3
LM234Z-6

OBSOLETE PACKAGE

Consider the S8 or Z Packages for Alternate Source

–

V

1

R

2

+

V

3

NC

4

S8 PACKAGE

8-LEAD PLASTIC SO

= 100°C, θJA = 180°C/W

T

JMAX

Consult LTC Marketing for availability of LM234Z-3 and LM234Z-6

ORDER PART

NUMBER

NC

8

NC

7

NC

6

NC

5

LM334S8

S8 PART

MARKING

334

2

LM134 Series

ELECTRICAL CHARACTERISTICS

CURRENT SOURCE (Note 2)

LM134 LM334

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

∆I

V

∆I
∆V

C

SET

MIN

SET

IN

S

Set Current Error, V+ = 2.5V 10µA ≤ I
(Note 3) 1mA < I

2µA ≤ I

Ratio of Set Current to 10µA ≤ I

–

Current 1mA ≤ I

V

2µA ≤ I

Minimum Operating Voltage 2µA ≤ I

100µA < I
1mA < I

≤ 1mA 3 6 %

SET

≤ 5mA 5 8 %

SET

< 10µA812%

SET

≤ 1mA 141823141826

SET

≤ 5mA 14 14

SET

≤ 10µA 1823 1826

SET

≤ 100µA 0.8 0.8 V

SET

≤ 1mA 0.9 0.9 V

SET

≤ 5mA 1.0 1.0 V

SET

Average Change in Set Current 1.5V ≤ V+ ≤ 5V 0.02 0.05 0.02 0.1 %/V
with Input Voltage 2µA ≤ I

5V ≤ V

+

SET

≤ V

≤ 1mA

(Note 5) 0.01 0.03 0.01 0.05 %/V

MAX

1.5V ≤ V ≤ 5V 0.03 0.03 %/V
1mA < I
5V ≤ V ≤ V

Temperature Dependence of 25µA ≤ I

≤ 5mA

SET

(Note 5) 0.02 0.02 %/V

MAX

≤ 1mA 0.96 1.04 0.96 1.04

SET

Set Current (Note 4)
Effective Shunt Capacitance 15 15 pF

TEMPERATURE SENSOR (Note 2)

LM134-3,LM234-3 LM134-6, LM234-6

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

∆I

SET

V

MIN

∆I

SET

∆V

IN

C

S

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: Unless otherwise specified, tests are performed at T
pulse testing so that junction temperature does not change during test.

Note 3: Set current is the current flowing into the V
by the following formula: I

Set Current Error, V+ = 2.5V 100µA ≤ I
(Note 3) T

= 25°C

j

≤ 1mA ±1 ±2%

SET

Equivalent Temperature Error ±3 ±6 °C
Ratio of Set Current to 100µA ≤ I

–

Current

V
Minimum Operating Voltage 100µA ≤ I

≤ 1mA 141826141826

SET

≤ 1mA 0.9 0.9 V

SET

Average Change in Set Current 1.5V ≤ V+ ≤ 5V 0.02 0.05 0.02 0.1 %/V
with Input Voltage 100µA ≤ I

5V ≤ V

Temperature Dependence of 100µA ≤ I

≤ 1mA

SET

+

≤ 30V 0.01 0.03 0.01 0.05 %/V

≤ 1mA 0.98 1.02 0.97 1.03

SET

Set Current (Note 4)
Equivalent Slope Error ±2 ±3%
Effective Shunt Capacitance 15 15 pF

= 67.7mV/R

SET

= 25°C with

j

+

pin. It is determined

(at 25°C). Set current error

SET

is expressed as a percent deviation from this amount. I

0.336%/°C at T
Note 4: I

(°K). I

SET

where I
Note 5: V

= 25°C.

j

is nominally directly proportional to absolute temperature

SET

at any temperature can be calculated from: I

is I

measured at TO (°K).

O

SET

= 40V for LM134 and 30V for other grades.

MAX

increases at

SET

= IO (T/TO)

SET

3

LM134 Series

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TYPICAL PERFOR A CE CHARACTERISTICS

Maximum Slew Rate for

Output Impedance

9

10

I = 10µA

8

10

I = 100µA

7

IMPEDANCE (Ω)

10

6

10

10

I = 1mA

100 1k 10k

FREQUENCY (Hz)

134 G01

Linear Operation

10

1.0

0.1

SLEW RATE (V/µs)

0.01

0.001
1 100 1000

10

I

SET

(µA)

134 G02

10000

Start-Up

10µA

0µA

100µA

0µA

SET

I

1mA
0mA

5V
0V

(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)

TIME

200µs

50µs

5µs

INPUT

134 G03

Transient Response

2

2µs

1
0

–1

5

(%)

0

SET

∆I

10µs

–5
10

0

–10

50µs

–20

(*NOTE SCALE CHANGES FOR EACH CURRENT LEVEL)

TIME

I

= 1mA

SET

V+ TO V– = 5V
∆V = 0.4V
t

= 500ns

r, f

I

= 100µA

SET

I

= 10µA

SET

Turn-On Voltage

10mA

Tj = 25°C

1mA

100µA

SET

I

10µA

1µA

0.6

0.4 0.8 1.21.0
V+ TO V– VOLTAGE

R

R

R

R

SET

SET

SET

SET

= 680Ω

134 G04

= 14Ω

= 68Ω

= 6.8k

134 G02

1.4

Voltage Across R

86
82
78
74
70
66
62

VOLTAGE (mV)

58
54
50
46

–50

–25

Ratio of I

21
20
19
18
17
16

RATIO

15
14
13
12
11

10µA

SET

0

TEMPERATURE (°C)

to V– Current

SET

100µA 1mA 10mA

I

SET

75

50

25

100

1314/15 G01

134 G08

125

Current Noise

10k

1k

100

CURRENT (pA/√Hz)

10

1

10 1k 10k

100

FREQUENCY (Hz)

Operating Current vs
Temperature

500

R

= 226Ω

SET

400

300

200

TEMPERATURE (°K)

100

0

100

0

200

OPERATING CURRENT (µA)

I

SET

I

SET

I

SET

I

SET

= 5mA

= 1mA

= 100µA

= 10µA

300

400

134 G09

134 G06

500

100k

225

125

TEMPERATURE (°C)

25

–75

–175

–275

4