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參數(shù)資料
| 型號(hào)： | INA330AIDGSR |
| 元件分類： | 熱敏電阻 |
| 英文描述： | THERMISTOR SIGNAL AMPLIFIER FOR TEMPERATURE CONTROL |
| 中文描述： | 熱敏電阻溫度控制信號(hào)放大器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 245K |
| 代理商： | INA330AIDGSR |
INA330
SBOS260
7
www.ti.com
loop can be accomplished by simply reversing the connec-
tions to the TEC, or by creating the desired polarity in the
intervening control circuitry. If differing values of V
1
and V
2
are used, resistor values should be chosen to maintain
balanced currents, I
1
and I
2
. Likewise, if a lower value of R
SET
is used, the excitation voltage must be lowered to keep I
1
and
I
2
at or below 125
μ
A.
C
FILTER
is calculated by:
C
R
kHz
FILTER
G
=
(
)
1
1 6
.
2
π
NOISE PERFORMANCE
Temperature control loops require low noise over a small
bandwidth, typically 10Hz, or less. The INA330
’
s internal
auto-correction circuitry eliminates virtually all 1/f noise (noise
that increases at low frequency). The peak-to-peak voltage
noise due to I
ERROR
, R
THERM
, R
SET
, and the buffers at 0.01Hz
to 10Hz results in a 0.0001
°
C contribution.
OUTPUT
The INA330 output (pin 8) is capable of swinging to within
10mV of the power-supply rails. It is able to achieve rail-to-
rail output performance while sinking or sourcing 12.5
μ
A.
V
ADJUST
can be used to create an offset voltage around which
the output can be centered.
ENABLE FUNCTION
The INA330 is enabled by applying a logic HIGH voltage
level to the Enable pin. Conversely, a logic LOW voltage
level will disable the amplifier, reducing its supply current
from 2.6mA to typically 2
μ
A. This pin should be connected to
a valid HIGH or LOW voltage or driven, not left open circuit.
Applications not requiring disable can connect pin 6 directly
to V+. The Enable pin can be modeled as a CMOS input
gate, as shown in Figure 4.
SELECTING COMPONENTS
R
SET
is the primary
“
reference
”
for the temperature control
loop. Its absolute resistance controls the set-point tempera-
ture. Again, its initial accuracy can be calibrated, but its
stability is crucial. Therefore, a high-quality, low-temperature
coefficient type must be used.
A 25ppm/
°
C precision resistor changes 0.15% from
–
40
°
C to
+85
°
C. This will produce a 0.03
°
C change in set-point tem-
perature. This error is approximately three-times larger than
that produced by the INA330.
The transfer function for the configuration shown in Figure 3 is:
V
V
R
I
I
O
ADJ
G
=
+
(
)
1
2
–
or
V
V
R
V
R
V
R
O
ADJ
G
THERM
SET
=
+
1
2
–
With V
1
= V
2
= V
EXCITE
,
V
V
V
R
R
R
O
ADJ
EXCITE
G
THERM
SET
=
+
1
1
–
2
3
10
1
9
5
4
V+
V
2
V
1
V
EXCITE
1V
6
Enable
High = On
Low = Off
8
7
I
1
I
2
R
SET
10k
R
200k
Thermistor
R
THERM
= 10k
C
500pF
I
O
= I
1
–
I
2
V
O
V
ADJUST
= +2.5V
FIGURE 3. Basic Configuration for the INA330.
V+
Enable
6
2
μ
A
FIGURE 4. Enable Pin Model.
Nominal values should use R
SET
= R
THERM
= 10k
at the
designed control temperature. Values less than 2k
can
cause the voltage excitation buffers to become unstable. The
buffer connected to pin 10 is characterized and tested to
supply the changing current in the thermistor. The thermistor
should not be connected to pin 1. An inversion of the control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA330AIDGSRG4 | 功能描述:差分放大器 Thermistor Signal for Temp Control RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA330AIDGST | 功能描述:差分放大器 Thermistor Signal for Temp Control RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA330AIDGST | 制造商:Texas Instruments 功能描述:IC AMP INST SMD VSSOP10 330 |
| INA330AIDGSTG4 | 功能描述:差分放大器 Thermistor Signal for Temp Control RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA331 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, Single-Supply, CMOS INSTRUMENTATION AMPLIFIERS |
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