INA330
INA3
30
SBOS260 – NOVEMBER 2002
THERMISTOR SIGNAL AMPLIFIER
FOR TEMPERATURE CONTROL
FEATURES
q
OPTIMIZED FOR PRECISION 10k
Ω
THERMISTOR APPLICATIONS
q
LOW OFFSET OVER TEMPERATURE:
0.009
°
C Temperature Error, –40
°
C to +85
°
C
q
q
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 (R
THERM
)
and precision resistor (R
SET
), creating currents I
1
and I
2
. The
current conveyor circuit produces an output current, I
O
, equal
to I
1
– I
2
, which flows through the external gain-setting
resistor. A buffered voltage output proportional to I
O
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.
Enable High = On
Low = Off
PID CONTROLLER
9
V
EXCITE
1V
V
2
V
1
2
3
5
6
V
O
EXCELLENT LONG-TERM STABILITY
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
V+
8
V
REF
2.5V
10
I
1
1
4
C
FILTER
500pF
7
I
O
= I
1
– I
2
I
2
Thermistor
R
THERM
= 10kΩ
R
SET
10kΩ
R
G
200kΩ
D/A
Converter
V
ADJUST
= +2.5V
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.
Copyright © 2002, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage .................................................................................. +5.5V
Signal Input Terminals:
(Pins 1, 2, 3, 6, and 10) Voltage
(2)
......................... –0.5V to (V+) + 0.5V
Current
(2)
...............................................
±10mA
(3)
.............................................................. Continuous
Output Short-Circuit
Operating Temperature Range ....................................... –40°C to +125°C
Storage Temperature Range .......................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) Input terminals are diode clamped to the power-supply rails. Input signals that
can swing more than 0.5V beyond the supply rails should be current limited to
10mA or less. (3) Short-circuit to ground.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION
PACKAGE
DESIGNATOR
(1)
DGS
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
PACKAGE
MARKING
TLB
ORDERING
NUMBER
INA330AIDGST
INA330AIDGSR
TRANSPORT
MEDIA, QUANTITY
Tape and Reel, 250
Tape and Reel, 2500
PRODUCT
INA330
PACKAGE-LEAD
MSOP-10
"
"
"
"
"
NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.
PIN CONFIGURATION
Top View
MSOP
I
2
(R
SET
)
V
2
V
1
GND
(Connect to V+)
1
2
3
4
5
INA330
10 I
1
(R
THERM
)
9
8
7
6
V+
V
O
I
O
(R
G
)
Enable
2
INA330
www.ti.com
SBOS260
ELECTRICAL CHARACTERISTICS: V
S
= +5V
BOLDFACE
limits apply over the specified temperature range,
T
A
= –40
°
C to +85
°
C
At T
A
= +25°C, V
1
= V
2
= +1V, V
ADJUST
= +2.5V, R
SET
= 10kΩ, R
THERM
= 10kΩ, R
G
= 200kΩ, C
FILTER
= 500pF, external 1kHz filtering, unless otherwise noted.
INA330
PARAMETER
VOLTAGE EXCITATION BUFFERS
Voltage Range
Offset Voltage
vs Temperature
vs Power Supply
Offset Voltage Match
(1)
vs Temperature
Input Bias Current
Output Current
CURRENT CONVEYOR
(2)
Gain Equation
Current Output Range
Voltage Compliance Range
Gain
Gain Error
Current Offset Error
Change Over Temperature
vs V
1
, V
2
vs Power Supply
Noise Current
f = 0.01Hz to 10Hz
OUTPUT BUFFER
Voltage Output Swing-to-Rail
Offset Voltage
vs Temperature
Input Bias Current
Short-Circuit Current
V
OS
∆V
OS
PSR
CONDITION
R
SET
= 10kΩ, R
THERM
= 10kΩ
R
SET
= 100kΩ, R
THERM
= 100kΩ
V
S
= +5V, V
1
– V
2
= 0
V
S
= +2.7V to +5.5V, V
1
– V
2
= 0
MIN
0.1
0.1 to 4.9
±60
±
0.2
3
±30
0.2
±0.2
+125
I
O
= I
1
– I
2
4.925
1
±0.1
±100
±100
25
12
500
5
10
30
0.1
Included in I
ERROR
±25
±0.2
±200
±
40
±200
TYP
MAX
1.25
UNITS
V
V
µV
µ
V/
°
C
µV/V
µV
µ
V/
°
C
nA
µA
I
B
±12.5
0.075
V
O
= +0.075V to +4.925V
I
1
= I
2
+25
°
C to +85
°
C, or +25
°
C to –40
°
C
V
1
= V
2
= +0.1V to +1.25V
I
ERROR
µA
V
A/A
%
nA
nA
nA/V
nA/V
pA/√Hz
pAp-p
mV
mV
µV
µ
V/
°
C
mA
R
L
= 100kΩ
R
L
= 10kΩ
dV
OS
/dT
I
SC
75
NOTES: (1) Total errors in voltage seen between pin 1 and pin 10. (2) See Figure 2.
TEST CONFIGURATION
V+
Enable High = On
Low = Off
5
6
V
O
9
V
EXCITE
1V
V
2
V
1
2
3
8
10
I
1
1
I
2
4
Thermistor
R
THERM
= 10kΩ
R
SET
10kΩ
C
FILTER
500pF
7
I
O
= I
1
– I
2
R
G
200kΩ
V
ADJUST
= +2.5V
INA330
SBOS260
www.ti.com
3
ELECTRICAL CHARACTERISTICS: V
S
= +5V
(Cont.)
INA330
PARAMETER
FREQUENCY RESPONSE
Bandwidth, –3dB
(3)
Slew Rate
POWER SUPPLY
Specified Voltage Range
Quiescent Current
Over Temperature
BW
SR
+2.7
I
Q
I
O
= 0, V
1
– V
2
= 0V, V
S
= +5V
2.6
CONDITION
MIN
TYP
BOLDFACE
limits apply over the specified temperature range,
T
A
= –40
°
C to +85
°
C.
At T
A
= +25°C, V
1
= V
2
= +1V, V
ADJUST
= +2.5V, R
SET
= 10kΩ, R
THERM
= 10kΩ, R
G
= 200kΩ, C
FILTER
= 500pF, external 1kHz filtering, unless otherwise noted.
MAX
UNITS
kHz
1
Not Slew Rate Limited
+5.5
3.6
3.9
0.25
1.6
75
100
2
–40
–40
–65
MSOP-10 Surface-Mount
150
V
mA
mA
V
V
µs
µs
µA
°C
°C
°C
°C/W
SHUTDOWN
Disable (Logic LOW Threshold)
Enable (Logic HIGH Threshold)
Enable Time
Disable Time
Shutdown Current and Enable Pin Current
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
NOTES: (3) Dynamic response is limited by filtering.
V
S
= +5V, Disabled
5
+85
+125
+150
4
INA330
www.ti.com
SBOS260
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
1
= V
2
= +1V, V
ADJUST
= +2.5V, R
SET
= 10kΩ, R
THERM
= 10kΩ (5%), R
G
= 200kΩ, C
FILTER
= 500pF, and external 1kHz filtering, unless otherwise noted.
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
PRODUCTION DISTRIBUTION
This error is generally
calibrated out.
Population
Population
209
–190
–171
–152
–133
–114
–95
–76
–57
–38
–19
0
19
38
57
76
95
114
133
152
171
190
209
Current Conveyor Offset Error (nA)
0.01Hz TO 10Hz VOLTAGE NOISE
0.0002°C/div
200µV/div
0.001°C
5s/div
INA330
SBOS260
–40
–36
–32
–28
–24
–20
–16
–12
–8
–4
0
4
8
12
16
20
24
28
32
36
40
Current Conveyor Offset Error
Change Over Temperature (nA)
Test Configuration
for this page.
+5V
9
V
EXCITE
1V
5
6
V
2
2
V
1
3
10
INA330
8
V
O
7
I
1
1
4
I
2
10kΩ
10kΩ
C
FILTER
500pF
R
G
200kΩ
2.5V
www.ti.com
5
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