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| 型號(hào)： | LM94022BIMG |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output |
| 中文描述： | ANALOG TEMP SENSOR-VOLTAGE, 0.898-2.298V, 2.70Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SC-70, 5 PIN |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 706K |
| 代理商： | LM94022BIMG |
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2.0 Mounting and Thermal
Conductivity
The LM94022 can be applied easily in the same way as
other integrated-circuit temperature sensors. It can be glued
or cemented to a surface.
To ensure good thermal conductivity, the backside of the
LM94022 die is directly attached to the GND pin (Pin 2). The
temperatures of the lands and traces to the other leads of the
LM94022 will also affect the temperature reading.
Alternatively, the LM94022 can be mounted inside a sealed-
end metal tube, and can then be dipped into a bath or
screwed into a threaded hole in a tank. As with any IC, the
LM94022 and accompanying wiring and circuits must be
kept insulated and dry, to avoid leakage and corrosion. This
is especially true if the circuit may operate at cold tempera-
tures where condensation can occur. If moisture creates a
short circuit from the output to ground or V
, the output
from the LM94022 will not be correct. Printed-circuit coatings
are often used to ensure that moisture cannot corrode the
leads or circuit traces.
The thermal resistance junction to ambient (
θ
) is the pa-
rameter used to calculate the rise of a device junction tem-
perature due to its power dissipation. The equation used to
calculate the rise in the LM94022’s die temperature is
where T
A
is the ambient temperature, I
is the quiescent
current, I
is the load current on the output, and V
is the
output voltage. For example, in an application where T
= 30
C, V
= 5 V, I
= 9 μA, Gain Select = 11, V
= 2.231
mV, and I
= 2 μA, the junction temperature would be 30.021
C, showing a self-heating error of only 0.021C. Since the
LM94022’s junction temperature is the actual temperature
being measured, care should be taken to minimize the load
current that the LM94022 is required to drive.
Figure 1
shows
the thermal resistance of the LM94022.
3.0 Output and Noise
Considerations
A push-pull output gives the LM94022 the ability to sink and
source significant current. This is beneficial when, for ex-
ample, driving dynamic loads like an input stage on an
analog-to-digital converter (ADC). In these applications the
source current is required to quickly charge the input capaci-
tor of theADC. See theApplications Circuits section for more
discussion of this topic. The LM94022 is ideal for this and
other applications which require strong source or sink cur-
rent.
The LM94022’s supply-noise gain (the ratio of the AC signal
on V
to the AC signal on V
) was measured during
bench tests. It’s typical attenuation is shown in the Typical
Performance Characteristics section. A load capacitor on the
output can help to filter noise.
For operation in very noisy environments, some bypass
capacitance should be present on the supply within approxi-
mately 2 inches of the LM94022.
4.0 Capacitive Loads
The LM94022 handles capacitive loading well. In an ex-
tremely noisy environment, or when driving a switched sam-
pling input on an ADC, it may be necessary to add some
filtering to minimize noise coupling. Without any precautions,
the LM94022 can drive a capacitive load less than or equal
to 1100 pF as shown in
Figure 2
. For capacitive loads
greater than 1100 pF, a series resistor may be required on
the output, as shown in
Figure 3
.
5.0 Output Voltage Shift
The LM94022 is very linear over temperature and supply
voltage range. Due to the intrinsic behavior of an NMOS/
PMOS rail-to-rail buffer, a slight shift in the output can occur
when the supply voltage is ramped over the operating range
of the device. The location of the shift is determined by the
relative levels of V
and V
OUT
. The shift typically occurs
when V
DD
- V
OUT
= 1.0V.
This slight shift (a few millivolts) takes place over a wide
change (approximately 200 mV) in V
DD
or V
OUT
. Since the
shift takes place over a wide temperature change of 5C to
20C, V
OUT
is always monotonic. The accuracy specifica-
tions in the Electrical Characteristics table already include
this possible shift.
Device Number
NS Package
Number
MAA05A
Thermal
Resistance (
θ
JA
)
415C/W
LM94022BIMG
FIGURE 1. LM94022 Thermal Resistance
20143015
FIGURE 2. LM94022 No Decoupling Required for
Capacitive Loads Less than 1100 pF.
20143033
C
LOAD
1.1 nF to
99 nF
100 nF to
999 nF
1 μF
R
S
3 k
1.5 k
800
FIGURE 3. LM94022 with series resistor for capacitive
Loading greater than 1100 pF.
L
www.national.com
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM94022BIMG/NOPB | 功能描述:板上安裝溫度傳感器 1.5V, SC70 MULT-GAIN ANALOG TEMP SENSOR RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM94022BIMGX | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM94022BIMGX/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM94022EVAL | 功能描述:溫度傳感器開(kāi)發(fā)工具 LM94022 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評(píng)估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流: |
| LM94022QBIMG | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output |
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