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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(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 245K |
| 代理商： | INA330AIDGSR |
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INA330
SBOS260
6
www.ti.com
APPLICATIONS INFORMATION
OVERVIEW
Precision temperature controllers are generally adjusted to
their set-point temperature to achieve the desired system
performance and to compensate for tolerance of the ther-
mistor and reference circuitry. After this adjustment, the
crucial issue is the stability of this set-point temperature.
When used in a temperature control loop (Figure 1), the
INA330 provides excellent control-point stability over time
and ambient temperature changes. Low 1/f noise assures
excellent short-term stability. Internal auto-zero circuitry as-
sures excellent stability throughout product life.
SOURCES OF ERRORS
The largest source of error in a control system will occur due
to R
SET
, see
“
Selecting Components
”
section.
The INA330 errors are extremely low. The primary errors in
the INA330 occur in the current conveyer circuitry, as shown
in Figure 2. Equal currents in R
SET
and R
THERM
produce a
small output current error of 200nA (maximum), and some
variation with temperature of 40nA (maximum). The offset is
calibrated out. Only the variation affects set-point stability.
The variation can be referred to the input as a set-point temp
variation: 10k
thermistor with a 4.5% temperature coeffi-
cient, (
α
=
–
0.045) changes resistance by 450
/
°
C. This
results in 4500nA change in I
1
for a 1
°
C temperature change
at the thermistor. Therefore, the 40nA maximum current
offset error variation with ambient temperature results in a
0.009
°
C variation in set-point temperature over
–
40
°
C to
+85
°
C ambient (40nA/4500nA/
°
C = 0.009
°
C set-point/
°
C
FIGURE 2. Current Conveyor Portion of the INA330.
8
7
I
O
= I
1
–
I
2
+ I
ERROR
+
I
ERROR
/
T
Current Conveyor: measures
the current difference between
pins 10 and 1.
2
3
10
1
R
10k
at 25
°
C
9.55k
at 26
°
C
I = 4500nA
R
SET
I
2
I
1
1V
D/A
Converter
2
3
10
1
9
5
4
V+
V
2
V
1
V
EXCITE
6
Enable
High = On
Low = Off
8
+0.9V/
°
C
for increasing
temperature.
7
I
1
I
2
R
SET
10k
(Selection of R
significantly affects
control system
—
see
“
Selecting Components
”
section.)
R
200k
Thermistor
R
THERM
= 10k
C
500pF
I
O
= I
1
–
I
2
V
O
V
2.5V
PID CONTROLLER
V
ADJUST
= +2.5V
TEC
Power
Amp
0.1
μ
F
Place 0.1
μ
F capacitor close
to and across the power-
supply pins.
FIGURE 1. The INA330 In Simplified Temperature Control Loop.
ambient). This is the variation in set-point temperature due to
variation in ambient temperature of the INA330.
Insignificant Errors
Input offset voltage of the voltage excitation buffers are auto-
zeroed to approximately 60
μ
V and match to 30
μ
V. Drift with
temperature is very low. They contribute negligible error.
Voltage excitation buffers have an input bias current of
0.2nA. With a source impedance of less than 10k
, errors
produced by the input bias current will be negligible.
Output buffer errors are auto-zeroed. When referred to the
input, their errors are negligible.
Gain error does not produce any significant temperature set-
point error when used in a temperature set-point control loop.
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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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