LM234D
更新时间：2024-09-18 02:20:20
描述：THREE TERMINAL ADJUSTABLE CURRENT SOURCES
概述
规格参数
数据手册
替代型号LM234D 概述
THREE TERMINAL ADJUSTABLE CURRENT SOURCES 三端可调电流源 其他模拟IC
LM234D 规格参数
| 是否Rohs认证： | 符合 | 生命周期： | Obsolete |
| 零件包装代码： | SOIC | 包装说明： | SOP, SOP8,.25 |
| 针数： | 8 | Reach Compliance Code： | compliant |
| HTS代码： | 8542.39.00.01 | 风险等级： | 5.06 |
| 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 |
LM234D 数据手册
通过下载LM234D数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载LM134-LM234
LM334
THREE TERMINAL ADJUSTABLE CURRENT SOURCES
.
.
.
.
OPERATES from 1V to 40V
0.02% V CURRENT REGULATION
PROGRAMMABLE from 1µA to 10mA
±3% INITIAL ACCURACY
Z
TO92
(Plastic Package)
DESCRIPTION
The LM134/LM234/LM334 are 3-terminal adjust-
able current sources characterized by :
- an operatingcurrent range of 10000 : 1
- an excellent current regulation
- a wide dynamic voltage range of 1V to 40V
The current is determined by an external resistor
without requiring other external components.
D
SO8
(Plastic Micropackage)
Reverse voltages of up to 20V will only draw a cur-
rent of several microamperes. This enables the
circuit tooperate asa rectifierandasa sourceofcur-
rent in a.c. applications.
ORDER CODES
For the LM134/LM234/LM334, the voltage on the
control pin is 64mV at +25oC and is directly propor-
tionaltotheabsolutetemperature(oK). The simplest
external resistor connection generates a current
with ≈ 0.33%/oC temperature dependence. Zero
drift can be obtainedbyaddinganadditionalresistor
and a diode to the external circuit.
Package
Part Num-
ber
Temperature
Range
Z
•
D
•
LM134
–55oC, +125oC
–25oC, +100oC
0oC, +70oC
LM234
•
•
LM334
•
•
Example : LM134Z
PIN CONNECTIONS
TO92
SO8
(Bottom view)
(Top view)
-
NC
8
NC
7
V
6
NC
5
-
+
V
V
2
ADJ
1
3
1
ADJ
2
NC
3
NC
4
V
+
October 1997
1/10
LM134-LM234-LM334
SCHEMATIC DIAGRAM
V
Q4
Q5
Q6
Q3
C1
Q1
Q2
50pF
ADJ
V
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
LM134 - LM234
LM334
Unit
Voltage V + to V –
Forward
V
40
20
30
20
Reverse
-
VADJ
ADJ Pin to V – Voltage
5
5
V
ISET
Ptot
Set Current
10
10
mA
mW
oC
Power Dissipation
400
400
Tstg
Storage Temperature Range
Operating Free-air Temperature Range
–65 to +150
Toper
LM134
LM234
LM334
–55 to +125
–25 to +100
0 to +70
oC
2/10
LM134-LM234-LM334
ELECTRICAL CHARACTERISTICS
Tj = +25oC with pulse testing so that junction temperature does not change during testing
(unless otherwise specified)
LM134 - LM234
LM334
Typ.
Parameter
Unit
Min.
Typ.
Max.
Min.
Max.
Set Current Error (V+ = +2.5V) - (note 1)
10µA ≤ ISET ≤ 1mA
%
3
5
8
6
8
12
1mA ≤ ISET ≤ 5mA
2µA ≤ ISET ≤ 10µA
Ratio of Set Current to V– Current
10µA ≤ ISET ≤ 1mA
14
18
14
14
23
14
18
14
14
26
1mA ≤ ISET ≤ 5mA
2µA ≤ ISET ≤ 10µA
Minimum Operating Voltage
2µA ≤ ISET ≤ 100µA
100µA ≤ ISET ≤ 1mA
1mA ≤ ISET ≤ 5mA
V
0.8
0.9
1
0.8
0.9
1
Average change in set current with input voltage
2µA ≤ ISET ≤ 1mA
% / V
+1.5V ≤ V+ ≤ +5V
0.02
0.01
0.05
0.03
0.02
0.01
0.1
0.05
+5V ≤ V+ ≤ +40V
1mA ≤ ISET ≤ 5mA
+1.5V ≤ V+ + ≤ +5V
0.03
0.02
0.03
0.02
+5V ≤ V+ ≤ +40V
Temperature Dependence of set current - (note 2)
25µA ≤ ISET ≤ 1mA
0.96 T
T
1.04 T 0.96 T
T
1.04 T
Effective Shunt Capacitance
15
15
pF
Notes : 1. Set current is the current flowing into theV+ pin. It is determined by the following formula Iset = 67.7mV/Rset
(Tj = +25oC).
Set current error is expressed as a percent deviation from this amount.
2. Iset is directly proportional to absolute temperature (oK). Iset at any temperature can be calculated from
Iset = IO (T/TO) where IO is Iset measured at TO (oK).
3/10
LM134-LM234-LM334
4/10
LM134-LM234-LM334
APPLICATION HINT
connectionresistance should be reduced by locat-
ing the current setting resistor close to the device.
Donot use sockets for the ICs. A contactresistance
of 0.7Ω is sufficient to decrease the output current
by 1% at the 1mA level.
SLEW RATE
At slew rates above a threshold (see curve) the
LM134, LM234, LM334 can have a non-linear cur-
rent characteristic. The slew rate at which this takes
place is directly proportional to Iset. At Iset = 10µA,
dv/dt max. = 0.01V/µS ; at Iset = 1mA, dv/dt max. =
1V/µS. Slew rates of more than 1V/µS do not dam-
age the circuit nor do they produce high currents.
SENSING TEMPERATURE
The LM134, LM234, LM334 are excellent remote
controlled temperature sensors because their op-
eration as sources of current preserves their accu-
racy even in the case of long connecting wires. The
outputcurrent isdirectly proportionaltothe absolute
temperaturein degrees Kelvin according to the fol-
lowing equation.
THERMAL EFFECTS
Internalheatingcan have a significant effect on cur-
rent regulation for an Iset above 100µA. For exam-
ple, each increase of 1V in the voltage across the
LM134 at Iset = 1mA will increase the junction tem-
peratureby ≈ 0.4oC (in still air). The output current
(Iset) has a temperature coefficient of about
0.33%/oC. Thus the change in current due to the in-
crease in temperaturewill be (0.4) (0.33) =0.132%.
This is a degradation of 10 : 1 in regulation versus
the true electrical effects.Thermaleffectsshould be
taken into account when d.c. regulation is critical
and Iset is higher than 100µA. The dissipation of the
connectionsof CB-97 packagecan reduce thisther-
mal effect by a coefficient of more than 3.
(227µV/oK) (T)
Iset
=
Rset
The calibrationof theLM134,LM234, LM334is sim-
plified by the fact that most of the initial accuracy is
due to gain limitation (slope error) and not an offset.
Gainadjustmentis a one point trim becausethe out-
put of thedevice extrapolates to zero at 0oK.
Initial output
c
b
Iset
Desired output
SHUNT CAPACITANCE
In certain applications, the 15pF value for the shunt
capacitance should be reduced :
c’
a
b’
- because of loading problems,
a’
T1
- because of limitation of the output impedance of
the current source in a.c. applications. This reduc-
tion of the capacitance can be easily carried out by
addingaFET asindicatedinthetypicalapplications.
The value of this capacitance can be reduced by at
least 3pF and regulation can be improved by an or-
der ofmagnitude without anymodificationof the d.c.
characteristics (except for the minimum input volt-
age).
0°K
T2
T3
This particularity of the LM134, LM234, LM334 is il-
lustrated in theabove diagram. Line abc represents
the sensor current before adjustment and line a’b’c’
representsthe desired output. An adjustment of the
gain provided at T2 will move the output from b to
b’ and will correct the slope at the same time so that
theoutput at T1 and T3 will be correct. This gainad-
justment can be carried out by means of Rset or the
load resistor utilized in the circuit. After adjustment,
the slope error should be less than 1%. A low tem-
peraturecoefficientforRset isnecessaryto keepthis
accuracy. A 33ppm/oC temperaturedrift of Rset will
give an error of 1% on the slope becausethe resis-
tance follows the same temperature variations as
the LM134, LM234, LM334. Three wires are re-
quired to isolate Rset from the LM134, LM234,
LM334. Since this solution is not recommended.
Metal-film resistors with a drift less than 20ppm/oC
are now available. Wirewound resistors can be util-
ized when very high stability is required.
NOISE
The current noise produced by LM134, LM234,
LM334 is about 4 times that of a transistor. If the
LM134, LM234, LM334 is utilized as an active load
for a transistor amplifier, the noise at the input will
increase by about 12dB. In most cases this is ac-
ceptable, 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 effects of the thermocouple and the
5/10
LM134-LM234-LM334
TYPICAL APPLICATIONS
Figure 1 : Basic 2-terminal Current Source
Figure 2 : Alternate Trimming Technique
Vi
Vi
V
V
ADJ
ADJ
V
Rset
V
R set
R1*
Vi
Vi
* For ±10% adjustment, select Rset 10%
high and make R1 ≈ 3 Rset
Figure 3 : Terminating Remote Sensor for
Figure 4 : Zero Temperature Coefficient Current
Voltage Output
Source
Vi
Vi
V
V
V
i
ADJ
ADJ
Rset
V
Rset
VO
R1*
10 Rset
D1
1N 457
RL
Vi
VO = (Iset) (RL) = 10mV/OK
Rset = 230Ω
RL = 10kΩ
* Select ratio of R1 to Rset to obtain
zero drift i+ ≈ 2Iset
6/10
LM134-LM234-LM334
Figure 5 : Low Output Impedance Thermometer
FIgure 6 : Low Output Impedance Thermometer
Vi > 4.8V
V
Vi
R3
ADJ
R1
R2
VO
V
R1
R2
V
V
C1
ADJ
VO
C1
R3
R1 = 230Ω, 1%
R2 = 10kΩ, 1%
R3 = 600Ω
VO = 10mV/oK
ZO ≤ 100Ω
R4
R1 = 15kΩ
R2 = 300Ω
R3 = 100Ω
R4 = 4.5kΩ
C1 = 2.2nF
Output impedance of the LM134, LM234, LM334 at the
− RoΩ
”ADJ” pin is approximately
where Ro is the equiva-
16
lent 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
VO = 10mV/OK
ZO ≤ 2Ω
Figure 7 : Micropower Bias
Figure 8 : Low Input Voltage Reference Driver
Vi
Vi
R1
UA776
C1
2N2905
1µA
VO
V
LM136
V
V
R set
ADJ
ADJ
V
R2
R1 = 1.5kΩ
R2 = 120Ω
C1 = 0.1µF
IO ≤ 3mA
Vi
+
VI ≥ Vref +200mV
VO = VZ +64mV (+25oC)
Rset = 68kΩ
7/10
LM134-LM234-LM334
Figure 9 : In-line Current Limiter
Figure 10 : Fet Cascading for Low Capacitance
Vi
Rset
I
set
ADJ
Q*
VDS > 1.2V
ADJ
V
V
Vi
V
C1*
V
Rset
OP AMP
Vi
* Select Q to ensure at least 1V
across the LM134, LM234, LM334.
Vp (1 – Iset/IDSS) ≥ 1.2V
* Use minimum value required to ensure
stability of protected circuit
8/10
LM134-LM234-LM334
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters
Dimensions
Inches
Min.
Typ.
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Typ.
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
A
a1
a2
a3
b
0.1
0.004
0.65
0.35
0.19
0.25
0.026
0.014
0.007
0.010
b1
C
c1
D
45o (typ.)
4.8
5.8
5.0
6.2
0.189
0.228
0.197
0.244
E
e
1.27
3.81
0.050
0.150
e3
F
3.8
0.4
4.0
1.27
0.6
0.150
0.016
0.157
0.050
0.024
L
M
S
8o (max.)
9/10
LM134-LM234-LM334
PACKAGE MECHANICAL DATA
3 PINS - PLASTIC PACKAGE TO92
Millimeters
Inches
Typ.
Dimensions
Min.
Typ.
1.27
3.7
Max.
Min.
Max.
L
B
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
O1
C
5.00
5.03
5.33
K
O2
a
0.5
0.508
0.016
0.0138
0.0197
0.02
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsi-
bility for the consequences of use of such information nor for any infringement 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 SGS-THOMSON
Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
10/10
LM234D 替代型号
| 型号 | 制造商 | 描述 | 替代类型 | 文档 |
| LM234DT | STMICROELECTRONICS | Three terminal adjustable current sources | 类似代替 |
|
LM234D 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| LM234DT | STMICROELECTRONICS | Three terminal adjustable current sources | 获取价格 |
|
| LM234H | NSC | 3-Terminal Adjustable Current Sources | 获取价格 |
|
| LM234H-3 | Linear | Analog Temperature Sensor, ANALOG TEMP SENSOR-CURRENT, ROUND, THROUGH HOLE MOUNT, METAL CAN, TO-46, 3 PIN | 获取价格 |
|
| LM234H-3 | NSC | Analog Temperature Sensor, ANALOG TEMP SENSOR-CURRENT, 10uA, 6Cel, ROUND, THROUGH HOLE MOUNT | 获取价格 |
|
| LM234H/NOPB | NSC | IC SPECIALTY ANALOG CIRCUIT, MBCY3, METAL CAN, TO-46, 3 PIN, Analog IC:Other | 获取价格 |
|
| LM234Z | STMICROELECTRONICS | THREE TERMINAL ADJUSTABLE CURRENT SOURCES | 获取价格 |
|
| LM234Z-3 | NSC | 3-Terminal Adjustable Current Sources | 获取价格 |
|
| LM234Z-3 | TI | LM134/LM234/LM334 3-Terminal Adjustable Current Sources | 获取价格 |
|
| LM234Z-3 | Linear | Analog Temperature Sensor, ANALOG TEMP SENSOR-CURRENT, RECTANGULAR, THROUGH HOLE MOUNT, PLASTIC, TO-92, 3 PIN | 获取价格 |
|
| LM234Z-3#PBF | Linear | Analog Temperature Sensor, ANALOG TEMP SENSOR-CURRENT, RECTANGULAR, THROUGH HOLE MOUNT, PLASTIC, TO-92, 3 PIN | 获取价格 |
|
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