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产品型号LM234DT的概述

LM234DT芯片概述 LM234DT是一种高性能的运算放大器，专为精密信号处理和模拟电路设计而开发。它广泛应用于各种电子仪器、数据采集系统、以及其他需要高准确性和低漂移的应用场合。其设计特点使得LM234DT特别适合用于高电压和高频率的环境中，同时还能保持优良的线性度和稳定性。 LM234DT的内部结构设计精巧，采用了先进的半导体工艺，使得其具有较低的噪声和低的失真，能够在多种工作条件下保持良好的性能表现。这种芯片通常作为信号放大、滤波、比较等功能的单元在电路中使用，可以有效提高系统的整体性能和可靠性。 LM234DT详细参数 LM234DT的关键参数包括： - 工作电压范围：通常为 ±2 V 至 ±15 V，适应性强。 - 输入偏置电流：一般在10 nA左右，具有较低的功耗特点。 - 增益带宽产品：超过 1 MHz，适合于高频应用。 - 输入阻抗：高达10 MΩ，适合处理微弱信号。...

产品型号LM234DT的Datasheet PDF文件预览

LM134-LM234-LM334

Three terminal adjustable current sources

Features

■ Operates from 1V to 40V

■ 0.02%/V current regulation

■ Programmable from 1µA to 10mA

■ ±3% initial accuracy

TO-92

(Plastic package)

Description

The LM134/LM234/LM334 are 3-terminal

adjustable current sources characterized by:

■ an operating current range of 10000: 1

■ an excellent current regulation

SO-8

(Plastic micropackage)

■ a wide dynamic voltage range of 1V t 10V

The current is determined by an external resistor

without requiring other external components.

Pin connections

Reverse voltages of up to 20V will only draw a

current of several microamperes. This enables the

circuit to operate as a rectifier and as a source of

current in a.c. applications.

TO-92

(Bottom view)

For the LM134/LM234/LM334, the voltage on the

control pin is 64mV at +25°C and is directly

proportional to the absolute temperature (°K). The

simplest external resistor connection generates a

current with approximately 0.33%/°C temperature

dependence. Zero drift can be obtained by adding

an additional resistor and a diode to the external

circuit.

ADJ

SO-8

(Top view)

V-

ADJ

V+

May 2007

Rev 3

1/16

www.st.com

Schematic diagram

LM134-LM234-LM334

Schematic diagram

Figure 1.

Schematic diagram

Absolute maximum ratings

Table 1.

Symbol

Absolute maximum ratings

Parameter

LM134

LM234

LM334

Unit

Voltage V+ to V-

Forward

Reverse

V_ADJ

ADJ pin to V^-voltage

I_set

P_tot

Set current

°C

Power dissipation

Storage temperature range

400

T_stg

T_oper

-65 to +150

Operating free-air temperature range -55 to +125 -25 to +100

0 to +70

°C

2/16

LM134-LM234-LM334

Electrical characteristics

T = +25°C with pulse testing so that junction temperature does not change during testing

(unless otherwise specified)

Table 2.

Electrical characteristics

LM134 - LM234

LM334

Typ.

Parameter

Unit

Min.

Typ.

Max.

Min.

Max.

Set current error (V⁺= +2.5V) -⁽¹⁾

10µA ≤ I_set≤ 1mA

1mA ≤ I_set≤ 5mA

2µA ≤ I_set≤ 10µA

Ratio of set current to V_-current

10µA ≤ I_set≤ 1mA

1mA ≤ I_set≤ 5mA

2µA ≤ I_set≤ 10µA

Minimum operating voltage

2µA ≤ I_set≤ 100µA

100µA ≤ I_set≤ 1mA

1mA ≤ I_set≤ 5mA

0.8

0.9

0.8

0.9

Average change in set current with input voltage

2µA ≤ I_set≤ 1mA

+1.5V ≤ V⁺≤ +5V

0.02

0.01

0.05

0.03

0.02

0.01

0.1

0.05

+5V ≤ V⁺≤ +40V

% / V

1mA ≤ I_set≤ 5mA

+1.5V ≤ V⁺≤ +5V

0.03

0.02

0.03

0.02

+5V ≤ V⁺≤ +40V

Temperature dependence of set current - ⁽²⁾

25µA ≤ I_set≤ 1mA

0.96 T

1.04 T 0.96 T

1.04 T

Effective shunt capacitance

1. The set current is the current flowing into the V+ pin. It is determined by the following formula:

I_set= 67.7mV/R_set(T_j= +25°C)

The set current error is expressed as a percent deviation from this amount.

2. I_setis directly proportional to absolute temperature (°K). I_setat any temperature can be calculated from

I_set= I_o(T/T_o)

where I_ois I_setmeasured at To (°K).

3/16

Electrical characteristics

LM134-LM234-LM334

Figure 2.

Output impedance

Figure 3.

Maximum slew rate for linear

operation

Frequency (Hz)

Startup

(µA)

set

Figure 4.

Figure 5.

Transient response

Time (scale changes at each current level)

Figure 7. Current noise

Figure 6.

Voltage across R

set

Frequency (Hz)

Temperature (°C)

4/16

LM134-LM234-LM334

Electrical characteristics

Figure 8.

Turn-on voltage

Figure 9.

Ratio of I to V current

set

V to V voltage (V)

(mA)

set

5/16

Application information

LM134-LM234-LM334

Application information

4.1

Slew rate

At slew rates above a threshold (see Figure 4 and Figure 5), the LM134, LM234, LM334 can

have a non-linear current characteristic. The slew rate at which this takes place is directly

proportional to I . At I = 10µA, dv/dt max. = 0.01V/µs ; at I = 1mA, dv/dt max. = 1V/µs.

set

Slew rates of more than 1V/µs do not damage the circuit nor do they produce high currents.

4.2

4.3

Thermal effects

Internal heating can have a significant effect on current regulation for an I above 100µA.

For example, each increase of 1V in the voltage across the LM134 at I = 1mA will

increase the junction temperature by ≈ 0.4°C (in still air). The output current (I ) has a

temperature coefficient of about 0.33%/°C. Thus the change in current due to the increase

in temperature will be (0.4) (0.33) = 0.132%. This is a degradation of 10 : 1 in regulation

versus the true electrical effects. Thermal effects should be taken into account when d.c.

set

regulation is critical and I is higher than 100µA.

set

Shunt capacitance

In certain applications, the 15pF value for the shunt capacitance should be reduced:

●

because of loading problems,

●

because of limitation of output impedance of the current source in a.c. applications.

You can easily reduce the capacitance by adding a FET as shown in Typical applications on

page 8.

The value of this capacitance can be reduced by at least 3pF and regulation can be

improved by an order of magnitude without any modifications of the d.c. characteristics

(except for the minimum input voltage).

4.4

4.5

Noise

The current noise produced by LM134, LM234, and LM334 is about 4 times that of a

transistor. If the LM134, LM234, LM334 is used as an active load for a transistor amplifier,

the noise at the input will increase by about 12dB. In most cases this is acceptable, and a

single amplifier can be built with a voltage gain higher than 2000.

Lead resistance

The sense voltage which determines the current of the LM134, LM234, LM334 is less than

100mV. At this level, the thermocouple effects and the connection resistance should be

reduced by locating the current setting resistor close to the device. Do not use sockets for

the ICs. A contact resistance of 0.7Ωis sufficient to decrease the output current by 1% at the

1mA level.

6/16

LM134-LM234-LM334

Application information

4.6

Sensing temperature

The LM134, LM234, LM334 are excellent remote controlled temperature sensors because

their operation as current sources preserves their accuracy even in the case of long

connecting wires. The output current is directly proportional to the absolute temperature in

Kelvin degrees according to the following equation.

(227µV/°K) (T)

----------------------------------------

I_set

R_set

The calibration of the LM134, LM234, LM334 is simplified by the fact that most of the initial

accuracy is due to gain limitation (slope error) and not an offset. Gain adjustment is a one

point trim because the output of the device extrapolates to zero at 0°K.

Figure 10. Device calibration

This particularity of the LM134, LM234, LM334 is illustrated in the above diagram. Line abc

represents the sensor current before adjustment and line a’b’c’ represents the desired

output. A gain adjustment provided at T2 will move the output from b to b’ and will correct

the slope at the same time so that the output at T1 and T3 will be correct. This gain

adjustment can be carried out by means of R or the load resistor used in the circuit. After

set

adjustment, the slope error should be less than 1%. A low temperature coefficient for R is

set

necessary to keep this accuracy. A 33ppm/°C temperature drift of R will give an error of

set

1% on the slope because the resistance follows the same temperature variations as the

LM134, LM234, LM334.

Three wires are required to isolate R from the LM134, LM234, LM334. Since this solution

set

is not recommended, metal-film resistors with a drift of less than 20ppm/°C are now

available. Wirewound resistors can be used when very high stability is required.

7/16

Application information

LM134-LM234-LM334

Typical applications

Figure 11. Basic 2-terminal current source

Figure 12. Alternate trimming technique

Figure 13. Terminating remote sensor for

voltage output

Figure 14. Zero temperature coefficient

current source

8/16

LM134-LM234-LM334

Application information

Figure 15. Low output impedance

thermometer

Figure 16. Low output impedance

thermometer

Figure 17. Micropower bias

Figure 18. Low input voltage reference driver

9/16

Application information

LM134-LM234-LM334

Figure 19. In-line current limiter

Figure 20. Fet cascading for low capacitance

10/16

LM134-LM234-LM334

Package information

In order to meet environmental requirements, STMicroelectronics offers these devices in

ECOPACK packages. These packages have a lead-free second level interconnect. The

category of second level interconnect is marked on the package and on the inner box label,

in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering

conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics

trademark. ECOPACK specifications are available at: www.st.com.

11/16

Package information

LM134-LM234-LM334

5.1

SO-8 package mechanical data

Dimensions

Ref.

Millimeters

Typ.

Inches

Min.

Max.

Min.

Typ.

Max.

1.75

0.25

0.069

0.010

0.10

1.25

0.28

0.17

4.80

5.80

3.80

0.004

0.049

0.011

0.007

0.189

0.228

0.150

0.48

0.23

5.00

6.20

4.00

0.019

0.010

0.197

0.244

0.157

4.90

6.00

3.90

1.27

0.193

0.236

0.154

0.050

0.25

0.40

1°

0.50

1.27

8°

0.010

0.016

1°

0.020

0.050

8°

ccc

0.10

0.004

12/16

LM134-LM234-LM334

Package information

5.2

TO-92 ammopack and tape & reel package mechanical data

Millimeters

Inches

Typ.

Dim.

Min.

Typ.

Max.

Min.

Max.

5.0

4.0

0.197

0.157

0.45

0.018

2.5

11.7

12.4

5.95

2.4

0.098

0.461

0.488

0.234

0.094

-0.039

0.689

0.224

0.335

12.7

6.35

2.5

13.7

0.500

0.250

0.098

0.539

0.512

0.266

0.110

0.039

0.748

0.248

0.384

0.020

0.787

0.650

0.984

0.165

0.433

F1/F2

Δh

ΔP

6.75

2.8

-1

17.5

5.7

18.0

19.0

6.3

9.75

0.5

0.709

0.236

0.354

8.5

15.5

3.8

16.5

0.610

0.150

0.630

0.157

4.0

4.2

13/16

Package information

LM134-LM234-LM334

5.3

TO-92 bulk package mechanical data

Millimeters

Typ.

Inches

Dim.

Min.

Max.

Min.

Typ.

Max.

1.27

3.7

0.05

3.2

4.45

4.58

12.7

0.407

0.35

4.2

5.2

0.126

0.1752

0.1803

0.5

0.1457

0.1969

0.198

0.1654

0.2047

0.2098

5.00

5.03

5.33

0.5

0.508

0.016

0.0138

0.0197

0.02

14/16

LM134-LM234-LM334

Ordering information

Table 3.

Order codes

Temperature

Part number

Package

Packing

Marking

range

Tube or

Tape & reel

LM134D/DT

-55°C to +125°C

SO-8

LM134

Bulk or

LM134Z/ZT/AP

LM234D/DT

-55°C to +125°C

-25°C to +100°C

-24°C to +100°C

-0°C to +70°C

TO-92

SO-8

Tape & reel or

Ammopack

LM134

LM234

LM334

LM334A

Tube or

Tape & reel

Bulk or

Tape & reel or

Ammopack

LM234Z/ZT/AP

LM334D/DT

TO-92

SO-8

Tube or

Tape & reel

Bulk or

Tape & reel or

Ammopack

LM334Z/ZT/AP

LM334AD/ADT

LM334AZ/AZT/AAP

TO-92

SO-8

Tube or

Tape & reel

Bulk or

Tape & reel or

Ammopack

TO-92

Revision history

Date

Revision

Changes

2-May-2003

28-Oct-2005

Initial release.

Internal revision.

Corrected error in pinout diagram for TO-92 package on cover page

(it is a bottom view, not a top view).

29-May-2007

Updated Section 5: Package information and expanded Table 3:

Order codes.

15/16

LM134-LM234-LM334

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Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no

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LM234DT产品参数

型号:	LM234DT
Brand Name：	STMicroelectronics
是否Rohs认证：	符合
生命周期：	Active
IHS 制造商：	STMICROELECTRONICS
零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25
针数：	8
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
Factory Lead Time：	10 weeks
风险等级：	0.78
Samacsys Confidence：	3
Samacsys Status：	Released
Samacsys PartID：	154149
Samacsys Pin Count：	8
Samacsys Part Category：	Integrated Circuit
Samacsys Package Category：	Small Outline Packages
Samacsys Footprint Name：	ST SO-8_6
Samacsys Released Date：	2015-04-16 09:48:08
Is Samacsys：	N
模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e4
长度：	4.9 mm
湿度敏感等级：	1
功能数量：	1
端子数量：	8
最高工作温度：	100 °C
最低工作温度：	-25 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified
座面最大高度：	1.75 mm
子类别：	Power Management Circuits
最大供电电压 (Vsup)：	40 V
最小供电电压 (Vsup)：	1 V
表面贴装：	YES
技术：	BIPOLAR
温度等级：	OTHER
端子面层：	Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：	GULL WING
端子节距：	1.27 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm
Base Number Matches：	1

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