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PDF INA330AIDGSR Data sheet ( Hoja de datos )
| Número de pieza | INA330AIDGSR | |
| Descripción | THERMISTOR SIGNAL AMPLIFIER FOR TEMPERATURE CONTROL | |
| Fabricantes | Burr-Brown Corporation | |
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INA330
INA330
SBOS260 – NOVEMBER 2002
THERMISTOR SIGNAL AMPLIFIER
FOR TEMPERATURE CONTROL
FEATURES
q OPTIMIZED FOR PRECISION 10kΩ
THERMISTOR APPLICATIONS
q LOW OFFSET OVER TEMPERATURE:
0.009°C Temperature Error, –40°C to +85°C
q EXCELLENT LONG-TERM STABILITY
q VERY LOW 1/f NOISE: (0.01Hz to 10Hz)
(Peak-to-Peak Equivalent to 0.0001°C)
q WIDE OUTPUT SWING: Within 10mV of Rails
q SUPPLY RANGE: Single +2.7V to +5.5V
q microPACKAGE: MSOP-10
q REQUIRES ONLY ONE PRECISION RESISTOR
APPLICATIONS
q THERMISTOR-BASED TEMPERATURE
CONTROLLERS FOR OPTICAL NETWORKING
q HIGH ACCURACY FOR TEC APPLICATIONS
q LASER TEMPERATURE CONTROL
DESCRIPTION
The INA330 is a precision amplifier designed for thermoelec-
tric cooler (TEC) control in optical networking applications. It
is optimized for use in 10kΩ thermistor-based temperature
controllers. The INA330 provides thermistor excitation and
generates an output voltage proportional to the difference in
resistances applied to the inputs. It uses only one precision
resistor plus the thermistor, thus providing an alternative to
the traditional bridge circuit. This new topology eliminates the
need for two precision resistors while maintaining excellent
accuracy for temperature control applications.
An excitation voltage is applied to the thermistor (RTHERM)
and precision resistor (RSET), creating currents I1 and I2. The
current conveyor circuit produces an output current, IO, equal
to I1 – I2, which flows through the external gain-setting
resistor. A buffered voltage output proportional to IO is also
provided.
The INA330 offers excellent long-term stability, and very low
1/f noise throughout the life of the product. The low offset
results in a 0.009°C temperature error from –40°C to +85°C.
It comes in MSOP-10 packaging and operates with supply
voltages from +2.7V to +5.5V. It is specified over the indus-
trial temperature range, –40°C to +85°C, with operation from
–40°C to +125°C.
VEXCITE
1V
V2 2
V1 3
V+
95
Enable High = On
Low = Off
6
8 VO
PID CONTROLLER
VREF
2.5V
I1
Thermistor
RTHERM = 10kΩ
10
1
I2
RSET
10kΩ
7 IO = I1 – I2
4
CFILTER
500pF
RG
200kΩ
VADJUST = +2.5V
D/A
Converter
INA330 In A Temperature Control Loop
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2002, Texas Instruments Incorporated
1 page  
TYPICAL CHARACTERISTICS
At TA = +25°C, V1 = V2 = +1V, VADJUST = +2.5V, RSET = 10kΩ, RTHERM = 10kΩ (5%), RG = 200kΩ, CFILTER = 500pF, and external 1kHz filtering, unless otherwise noted.
CURRENT CONVEYOR OFFSET ERROR
PRODUCTION DISTRIBUTION
This error is generally
calibrated out.
CURRENT CONVEYOR OFFSET ERROR
CHANGE OVER TEMPERATURE
PRODUCTION DISTRIBUTION
Change in offset error from
+25°C to +85°C, or from
+25°C to –40°C.
A 40nA 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.
Current Conveyor Offset Error (nA)
0.01Hz TO 10Hz VOLTAGE NOISE
5s/div
Current Conveyor Offset Error
Change Over Temperature (nA)
Test Configuration
for this page.
+5V
9 56
VEXCITE
1V
V2 2
V1 3
10 INA330
I1
1
8
7
I2 4
10kΩ
10kΩ
CFILTER
500pF
VO
RG
200kΩ
2.5V
INA330
SBOS260
www.ti.com
5
5 Page 
DIGITALLY COMPENSATED LOOP
The PID compensation can be replaced with a microcontroller
or DSP, as shown in Figure 10. An Analog-to-Digital (A/D)
converter would be used to digitize the output of the INA330.
The analog PID provides sufficient filtering inherently, and,
therefore requires no additional filtering. The digital control
loop shown in Figure 10 does not provide this inherent
filtering, requiring additional output filtering (RO and CO) as
shown to avoid sampling the internal chopping noise of the
INA330 and the A/D converter input and affecting accuracy.
High-frequency noise is created by internal auto-correction
circuitry and is highly dependent on the filter characteristics
chosen. “Spurs” occur at approximately 90kHz and its har-
monics which is reduced by additional filtering at or below
1kHz. This may be the dominant source of noise visible when
viewing the output on an oscilloscope. Low cutoff frequency
filters will provide lowest noise.
TRADITIONAL BRIDGE CIRCUIT
The traditional bridge circuit (Figure 11) uses three matched
resistors and a thermistor to detect temperature changes.
The INA326 and INA327 instrumentation amplifiers are well
suited to a bridge implementation for thermistor measure-
ment.
Enable
+5V +5V
+1V
V1
V2
95
2
3
6
8
INA330
7
RO
100Ω
CO
1µF
Loop Compensation
is performed in DSP.
A/D
Converter
DSP
D/A
Converter
TEC
RTHERM
RSET
10kΩ
CFILTER
500pF
RG
200kΩ
VADJ
0V to 5V
Ref
D/A
Converter
Temp
Adjust
FIGURE 10. Digitally Compensated Loop.
VEXCITE
10kΩ(1)
10kΩ(1)
+5V
PID CONTROLLER
✻
10kΩ(2) 5kΩ
INA326
VREF
2.5V
✻ 10kΩ at set-point
temperature.
100kΩ
1nF
NOTES: (1) Requires ratio matching tracking.
(2) Requires absolute accuracy and stability.
VADJ
D/A
Converter
FIGURE 11. Traditional Bridge Circuit.
INA330
SBOS260
www.ti.com
11
11 Page | ||
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| PDF Descargar | [ Datasheet INA330AIDGSR.PDF ] | |
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