TI OPA2140AIDR High-precision, low-noise, rail-to-rail output 11mhz jfet op amp Datasheet

OPA140
OPA2140, OPA4140
www.ti.com
SBOS498A – JULY 2010 – REVISED AUGUST 2010
High-Precision, Low-Noise, Rail-to-Rail Output,
11MHz JFET Op Amp
Check for Samples: OPA140, OPA2140, OPA4140
FEATURES
DESCRIPTION
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The OPA140, OPA2140, and OPA4140 op amp
family is a series of low-power JFET input amplifiers
that feature good drift and low input bias current. The
rail-to-rail output swing and input range that includes
V– allow designers to take advantage of the
low-noise characteristics of JFET amplifiers while
also interfacing to modern, single-supply, precision
analog-to-digital
converters
(ADCs)
and
digital-to-analog converters (DACs).
1
2
Very Low Offset Drift: 1mV/°C max
Very Low Offset: 120mV
Low Input Bias Current: 10pA max
Very Low 1/f Noise: 250nVPP, 0.1Hz to 10Hz
Low Noise: 5.1nV/√Hz
Slew Rate: 20V/ms
Low Supply Current: 2.0mA max
Input Voltage Range Includes V– Supply
Single-Supply Operation: 4.5V to 36V
Dual-Supply Operation: ±2.25V to ±18V
No Phase Reversal
Industry-Standard SO Packages
MSOP-8, TSSOP, and SOT23 Packages
APPLICATIONS
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Battery-Powered Instruments
Industrial Controls
Medical Instrumentation
Photodiode Amplifiers
Active Filters
Data Acquisition Systems
Automatic Test Systems
0.1Hz to 10Hz NOISE
VSUPPLY = ±18V
Competitor’s Device
200nV/div
OPAx140
The OPA140 achieves 11MHz unity-gain bandwidth
and 20V/ms slew rate while consuming only 1.8mA
(typ) of quiescent current. It runs on a single 4.5 to
36V supply or dual ±2.25V to ±18V supplies.
All versions are fully specified from –40°C to +125°C
for use in the most challenging environments. The
OPA140 (single) is available in the SOT23-5,
MSOP-8, and SO-8 packages; the OPA2140 (dual) is
available in both MSOP-8 and SO-8 packages; and
the OPA4140 (quad) is available in the SO-14 and
TSSOP-14 packages.
RELATED PRODUCTS
FEATURES
PRODUCT
Low-Power, 10MHz FET Input
Industrial Op Amp
OPA141
2.2nV/√Hz, Low-Power, 36V
Operational Amplifier in SOT23
Package
OPA209
Low-Noise, High-Precision, 22MHz,
4nV/√Hz JFET-Input Operational
Amplifier
OPA827
Low-Noise, Low IQ Precision CMOS
Operational Amplifier
OPA376
High-Speed, FET-Input Operational
Amplifier
OPA132
Time (1s/div)
1
2
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated
OPA140
OPA2140, OPA4140
SBOS498A – JULY 2010 – REVISED AUGUST 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments 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.
ABSOLUTE MAXIMUM RATINGS (1)
Over operating free-air temperature range (unless otherwise noted).
VALUE
UNIT
±20
V
Supply Voltage
Signal Input
Terminals
Voltage (2)
(V–) –0.5 to (V+) +0.5
V
Current (2)
±10
mA
Output Short-Circuit (3)
Continuous
Operating Temperature, TA
–55 to +150
°C
Storage Temperature, TA
–65 to +150
°C
Junction Temperature, TJ
ESD Ratings
(1)
(2)
(3)
+150
°C
Human Body Model (HBM)
2000
V
Charged Device Model (CDM)
500
V
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 supported.
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 10 mA or less.
Short-circuit to VS/2 (ground in symmetrical dual-supply setups), one amplifier per package.
PACKAGE INFORMATION (1)
PRODUCT
OPA140
OPA2140
OPA4140
(1)
2
PACKAGE-LEAD
PACKAGE DESIGNATOR
PACKAGE MARKING
SO-8
D
OPA140
MSOP-8
DGK
140
SOT23-5
DBV
O140
SO-8
D
O2140A
MSOP-8
DGK
2140
TSSOP-14
PW
O4140A
SO-14
D
O4140A
For the most current package and ordering information see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
OPA140
OPA2140, OPA4140
www.ti.com
SBOS498A – JULY 2010 – REVISED AUGUST 2010
ELECTRICAL CHARACTERISTICS: VS = +4.5V to +36V; ±2.25V to ±18V
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
OPA140, OPA2140, OPA4140
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
30
120
mV
OFFSET VOLTAGE
Offset Voltage, RTI
VOS
Over Temperature
Drift
vs Power Supply
VS = ±18V
VS = ±18V
dVOS/dT
PSRR
xxxOver Temperature
220
mV
VS = ±18V
±0.35
1.0
mV/°C
VS = ±2.25V to ±18V
±0.1
±0.5
mV/V
±4
mV/V
VS = ±2.25V to ±18V
INPUT BIAS CURRENT (1)
Input Bias Current
IB
±0.5
±10
pA
±3
nA
IOS
±0.5
±10
pA
±1
nA
Over Temperature
Input Offset Current
Over Temperature
NOISE
Input Voltage Noise
f = 0.1Hz to 10Hz
250
nVPP
f = 0.1Hz to 10Hz
42
nVRMS
f = 10Hz
8
nV/√Hz
f = 100Hz
5.8
nV/√Hz
5.1
nV/√Hz
0.8
fA/√Hz
Input Voltage Noise Density
en
f = 1kHz
Input Current Noise Density
In
f = 1kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
VCM
CMRR
Over Temperature
(V–) –0.1
VS = ±18V, VCM = (V–) –0.1V
to (V+) – 3.5V
126
VS = ±18V, VCM = (V–) –0.1V
to (V+) – 3.5V
120
(V+)–3.5
140
V
dB
dB
INPUT IMPEDANCE
Differential
Common-Mode
VCM = (V–) –0.1V to (V+) –3.5V
1013 || 10
Ω || pF
1013 || 7
Ω || pF
dB
OPEN-LOOP GAIN
Open-Loop Voltage Gain
AOL
Over Temperature
VO = (V–)+0.35V to (V+)–0.35V, RL =
10kΩ
120
126
VO = (V–)+0.35V to (V+)–0.35V, RL = 2kΩ
114
126
VO = (V–)+0.35V to (V+)–0.35V, RL = 2kΩ
108
dB
dB
FREQUENCY RESPONSE
Gain Bandwidth Product
11
MHz
Slew Rate
BW
20
V/ms
Settling Time, 12-bit (0.024)
880
ns
Settling Time, 16-bit
1.6
ms
THD+N
1kHz, G = 1, VO = 3.5VRMS
Overload Recovery Time
(1)
0.00005
%
600
ns
High-speed test, TA = TJ.
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
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OPA140
OPA2140, OPA4140
SBOS498A – JULY 2010 – REVISED AUGUST 2010
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ELECTRICAL CHARACTERISTICS: VS = +4.5V to +36V; ±2.25V to ±18V (continued)
Boldface limits apply over the specified temperature range, TA = –40°C to +125°C.
At TA = +25°C, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
OPA140, OPA2140, OPA4140
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
V
OUTPUT
Voltage Output
VO
Short-Circuit Current
ISC
Capacitive Load Drive
RL = 10kΩ, AOL ≥ 108dB
(V–)+0.2
(V+)–0.2
RL = 2kΩ, AOL ≥ 108dB
(V–)+0.35
(V+)–0.35
+36
mA
Sink
–30
mA
CLOAD
Open-Loop Output Impedance
V
Source
See Figure 20 and Figure 21
RO
f = 1MHz, IO = 0 (See Figure 19)
Ω
16
POWER SUPPLY
Specified Voltage Range
VS
Quiescent Current
(per amplifier)
±2.25
IQ
IO = 0mA
±18
V
2.0
mA
2.7
mA
1.8
Over Temperature
CHANNEL SEPARATION
Channel Separation
At dc
0.02
mV/V
At 100kHz
10
mV/V
TEMPERATURE RANGE
Specified Range
–40
+125
°C
Operating Range
–55
+150
°C
THERMAL INFORMATION
THERMAL METRIC
OPA140,
OPA2140
OPA140,
OPA2140
OPA140
D (SO)
DGK (MSOP)
DBV (SOT23)
(1)
8
8
5
qJA
Junction-to-ambient thermal resistance
160
180
210
qJC(top)
Junction-to-case(top) thermal resistance
75
55
200
qJB
Junction-to-board thermal resistance
60
130
110
yJT
Junction-to-top characterization parameter
9
n/a
40
yJB
Junction-to-board characterization parameter
50
120
105
qJC(bottom)
Junction-to-case(bottom) thermal resistance
n/a
n/a
n/a
(1)
UNITS
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
THERMAL INFORMATION
THERMAL METRIC (1)
OPA4140
OPA4140
D (SO)
PW (TSSOP)
14
14
qJA
Junction-to-ambient thermal resistance
97
135
qJC(top)
Junction-to-case(top) thermal resistance
56
45
qJB
Junction-to-board thermal resistance
53
66
yJT
Junction-to-top characterization parameter
19
n/a
yJB
Junction-to-board characterization parameter
46
60
qJC(bottom)
Junction-to-case(bottom) thermal resistance
n/a
n/a
(1)
4
UNITS
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
OPA140
OPA2140, OPA4140
www.ti.com
SBOS498A – JULY 2010 – REVISED AUGUST 2010
PIN ASSIGNMENTS
OPA140
SO-8, MSOP-8
(TOP VIEW)
NC
(1)
OPA2140
SO-8, MSOP-8
(TOP VIEW)
(1)
1
8
NC
-In
2
7
V+
+In
3
6
Out
V-
4
5
NC
OUT A
1
-In A
2
+In A
3
V-
4
V-
2
+IN
3
V+
5
4
7
Out B
6
-In B
5
+In B
OPA4140
SO-14, TSSOP-14
(TOP VIEW)
OPA140
SOT23-5
(TOP VIEW)
1
B
V+
(1)
(1) NC denotes no internal connection.
OUT
A
8
Out A
1
-In A
2
A
14
Out D
13
-In D
D
+In A
3
12
+In D
V+
4
11
V-
+ In B
5
10
+ In C
-IN
B
C
-In B
6
9
-In C
Out B
7
8
Out C
SIMPLIFIED BLOCK DIAGRAM
V+
Pre-Output Driver
IN-
OUT
IN+
V-
Figure 1.
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
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OPA140
OPA2140, OPA4140
SBOS498A – JULY 2010 – REVISED AUGUST 2010
www.ti.com
TYPICAL CHARACTERISTICS SUMMARY
TABLE OF GRAPHS
Table 1. Characteristic Performance Measurements
DESCRIPTION
FIGURE
Offset Voltage Production Distribution
Figure 2
Offset Voltage Drift Distribution
Figure 3
Offset Voltage vs Common-Mode Voltage (Max Supply)
Figure 4
IB vs Common-Mode Voltage
Figure 6
Input Offset Voltage vs Temperature
Figure 5
Output Voltage Swing vs Output Current
Figure 7
CMRR and PSRR vs Frequency (RTI)
Figure 8
Common-Mode Rejection Ratio vs Temperature
Figure 9
0.1Hz to 10Hz Noise
Figure 10
Input Voltage Noise Density vs Frequency
Figure 11
THD+N Ratio vs Frequency (80kHz AP Bandwidth)
Figure 12
THD+N Ratio vs Output Amplitude
Figure 13
Quiescent Current vs Temperature
Figure 14
Quiescent Current vs Supply Voltage
Figure 15
Gain and Phase vs Frequency
Figure 16
Closed-Loop Gain vs Frequency
Figure 17
Open-Loop Gain vs Temperature
Figure 18
Open-Loop Output Impedance vs Frequency
Figure 19
Small-Signal Overshoot vs Capacitive Load (G = +1)
Figure 20
Small-Signal Overshoot vs Capacitive Load (G = –1)
Figure 21
No Phase Reversal
Figure 22
Positive Overload Recovery
Figure 24
Negative Overload Recovery
Figure 25
Large-Signal Positive and Negative Settling Time
6
Figure 26, Figure 27
Small-Signal Step Response (G = +1)
Figure 28
Small-Signal Step Response (G = –1)
Figure 29
Large-Signal Step Response (G = +1)
Figure 30
Large-Signal Step Response (G = –1)
Figure 31
Short-Circuit Current vs Temperature
Figure 32
Maximum Output Voltage vs Frequency
Figure 23
Channel Separation vs Frequency
Figure 33
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
OPA140
OPA2140, OPA4140
www.ti.com
SBOS498A – JULY 2010 – REVISED AUGUST 2010
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
OFFSET VOLTAGE DRIFT DISTRIBUTION
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Population
Population
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
Offset Voltage (mV)
Offset Voltage Drift (mV/°C)
Figure 2.
Figure 3.
OFFSET VOLTAGE vs COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE vs TEMPERATURE
(144 Amplifiers)
160
18 Typical Units Shown
120
80
60
40
20
0
-20
-40
-60
-80
-100
-120
Input Offset Voltage (mV)
VOS (mV)
120
100
80
40
0
-40
-80
-120
-160
-18
-12
0
-6
6
12
18
-40 -25 -10
5
20
35
50
65
80
95
110 125
Temperature (?C)
VCM (V)
Figure 4.
Figure 5.
IB vs COMMON-MODE VOLTAGE
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
(MAX SUPPLY)
18.0
10
17.5
+14.5V
Output Voltage (V)
-0.1V
IB (pA)
17.0
Specified Common-Mode
Voltage Range
8
6
4
+IB
2
0
16.5
16.0
-40°C +25°C
+85°C
+125°C
-16.0
-16.5
-17.0
-17.5
-IB
-18 -15 -12 -9
-18.0
-6
-3
0
3
6
9
12
15
18
0
10
20
30
40
50
60
70
Output Current (mA)
VCM (V)
Figure 6.
Figure 7.
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Product Folder Link(s): OPA140 OPA2140 OPA4140
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OPA140
OPA2140, OPA4140
SBOS498A – JULY 2010 – REVISED AUGUST 2010
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TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
CMRR AND PSRR vs FREQUENCY (Referred to Input)
COMMON-MODE REJECTION RATIO vs TEMPERATURE
0.12
CMRR
160
0.10
140
120
CMRR (mV/V)
Common-Mode Rejection Ratio (dB)
Power-Supply Rejection Ratio (dB)
180
100
-PSRR
80
+PSRR
60
0.08
0.06
0.04
40
0.02
20
0
0
1
10
100
1k
10k
100k
1M
10M
100M
-75
-50
0
-25
Frequency (Hz)
25
75
50
100
125
150
Temperature (°C)
Figure 8.
Figure 9.
0.1Hz to 10Hz NOISE
INPUT VOLTAGE NOISE DENSITY vs FREQUENCY
100nV/div
Voltage Noise Density (nV/ÖHz)
100
10
1
Time (1s/div)
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
Figure 10.
Figure 11.
THD+N RATIO vs FREQUENCY
G = -1
0.0001
-120
G = +1
0.00001
-140
10
100
1k
10k 20k
Total Harmonic Distortion + Noise (%)
VOUT = 3VRMS
BW = 80kHz
RL = 2kW
0.01
BW = 80kHz
1kHz Signal
RL = 2kW
G = -1
G = +1
0.001
-100
0.0001
-120
0.00001
NOTE: Increase at low signal levels is a result
of increased % contribution of noise.
0.1
1
10
-140
100
Frequency (Hz)
Frequency (Hz)
Figure 12.
8
-80
Total Harmonic Distortion + Noise (dB)
Total Harmonic Distortion + Noise (%)
THD+N RATIO vs OUTPUT AMPLITUDE
-100
Total Harmonic Distortion + Noise (dB)
0.001
Figure 13.
Copyright © 2010, Texas Instruments Incorporated
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OPA2140, OPA4140
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SBOS498A – JULY 2010 – REVISED AUGUST 2010
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
QUIESCENT CURRENT vs SUPPLY VOLTAGE
2.5
2.00
OPA140
1.75
2.0
1.50
1.25
IQ (mA)
IQ (mA)
1.5
1.0
1.00
0.75
0.50
0.5
0.25
0
Specified Supply-Voltage Range
0
-75
-50
0
-25
25
75
50
100
125
150
0
4
8
12
Temperature (°C)
Figure 14.
20
24
28
32
36
Figure 15.
GAIN AND PHASE vs FREQUENCY
CLOSED-LOOP GAIN vs FREQUENCY
140
180
40
120
CL = 30pF
30
G = +10
Gain
135
90
60
40
Phase
Phase (degrees)
80
20
Gain (dB)
100
Gain (dB)
16
Supply Voltage (V)
45
20
10
G = +1
0
-10
-20
G = -1
0
-30
0
100M
-20
10
100
1k
10k
100k
1M
10M
-40
100k
1M
Frequency (Hz)
10M
100M
Frequency (Hz)
Figure 16.
Figure 17.
OPEN-LOOP GAIN vs TEMPERATURE
OPEN-LOOP OUTPUT IMPEDANCE vs FREQUENCY
1k
0
10kW Load
-0.2
100
-0.6
ZO (W)
AOL (mV/V)
-0.4
2kW Load
-0.8
10
-1.0
-1.2
1
-1.4
-75
-50
-25
0
25
75
50
100
125
150
10
100
1k
Temperature (°C)
Figure 18.
10k
100k
1M
10M
100M
Frequency (Hz)
Figure 19.
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TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
SMALL-SIGNAL OVERSHOOT
vs CAPACITIVE LOAD (100mV Output Step)
40
SMALL-SIGNAL OVERSHOOT
vs CAPACITIVE LOAD (100mV Output Step)
50
ROUT = 0W
G = +1
+15V
35
45
ROUT
OPA140
25
ROUT = 0W
40
RL
-15V
ROUT = 24W
CL
Overshoot (%)
Overshoot (%)
30
ROUT = 24W
20
15
35
30
25
20
ROUT = 51W
15
10
RI = 2kW
RF = 2kW
G = -1
+15V
10
ROUT = 51W
5
ROUT
OPA140
CL
5
0
-15V
0
0
200
400
600
800
1000
1200
1400
1600
0
500
1000
1500
Capacitive Load (pF)
Capacitive Load (pF)
Figure 20.
Figure 21.
NO PHASE REVERSAL
2000
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
35
Maximum output
voltage range
without slew-rate
induced distortion
VS = ±15V
30
Output Voltage (VPP)
5V/div
Output
+18V
OPA140
Output
25
20
15
VS = ±5V
10
-18V
37VPP
Sine Wave
(±18.5V)
VS = ±2.25V
5
0
Time (0.4ms/div)
10k
100k
1M
10M
Frequency (Hz)
Figure 22.
Figure 23.
POSITIVE OVERLOAD RECOVERY
NEGATIVE OVERLOAD RECOVERY
VOUT
5V/div
5V/div
VIN
20kW
20kW
2kW
VIN
2kW
OPA140
VOUT
OPA140
VIN
G = -10
G = -10
Time (0.4ms/div)
Time (0.4ms/div)
Figure 24.
10
VOUT
VIN
VOUT
Figure 25.
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Product Folder Link(s): OPA140 OPA2140 OPA4140
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SBOS498A – JULY 2010 – REVISED AUGUST 2010
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
LARGE-SIGNAL NEGATIVE SETTLING TIME
(10V Step)
1000
1000
800
800
600
400
16-bit Settling
200
0
-200
(±1/2LSB = ±0.00075%)
-400
-600
Delta from Final Value (mV)
Delta from Final Value (mV)
LARGE-SIGNAL POSITIVE SETTLING TIME
(10V Step)
600
400
0
-200
-600
-800
-1000
-1000
0.5
1
1.5
2
2.5
3
3.5
(±1/2LSB = ±0.00075%)
-400
-800
0
16-bit Settling
200
4
0
0.5
1
1.5
2
2.5
3
Time (ms)
Time (ms)
Figure 26.
Figure 27.
SMALL-SIGNAL STEP RESPONSE
(100mV)
SMALL-SIGNAL STEP RESPONSE
(100mV)
G = +1
+15V
OPA140
-15V
RL
4
CL = 100pF
10mV/div
10mV/div
CL = 100pF
3.5
RI
= 2kW
RF
= 2kW
+15V
OPA140
CL
CL
-15V
G = -1
Time (100ns/div)
Time (100ns/div)
Figure 28.
Figure 29.
LARGE-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
G = +1
CL = 100pF
2V/div
2V/div
G = -1
CL = 100pF
Time (400ns/div)
Time (400ns/div)
Figure 30.
Figure 31.
Copyright © 2010, Texas Instruments Incorporated
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11
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OPA2140, OPA4140
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TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, VS = ±18V, RL = 2kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
SHORT-CIRCUIT CURRENT vs TEMPERATURE
CHANNEL SEPARATION vs FREQUENCY
60
-90
ISC, Source
ISC, Sink
Channel Separation (dB)
50
ISC (mA)
40
30
20
10
-100
VOUT = 3VRMS
G = +1
-110
RL = 2kW
-120
-130
-140
Short-circuiting causes thermal shutdown;
see Applications Information section.
RL = 5kW
0
-150
-75
-50
-25
0
25
75
50
100
125
150
10
100
Temperature (°C)
Figure 32.
12
1k
10k
100k
Frequency (Hz)
Figure 33.
Copyright © 2010, Texas Instruments Incorporated
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OPA2140, OPA4140
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SBOS498A – JULY 2010 – REVISED AUGUST 2010
APPLICATION INFORMATION
OPERATING VOLTAGE
The OPA140, OPA2140, and OPA4140 series of op
amps can be used with single or dual supplies from
an operating range of VS = +4.5V (±2.25V) and up to
VS = +36V (±18V). These devices do not require
symmetrical supplies; they only require a minimum
supply voltage of +4.5V (±2.25V). For VS less than
±3.5V, the common-mode input range does not
include midsupply. Supply voltages higher than +40V
can permanently damage the device; see the
Absolute Maximum Ratings table. Key parameters
are specified over the operating temperature range,
TA = –40°C to +125°C. Key parameters that vary over
the supply voltage or temperature range are shown in
the Typical Characteristics section of this data sheet.
CAPACITIVE LOAD AND STABILITY
The dynamic characteristics of the OPAx140 have
been optimized for commonly encountered gains,
loads, and operating conditions. The combination of
low closed-loop gain and high capacitive loads
decreases the phase margin of the amplifier and can
lead to gain peaking or oscillations. As a result,
heavier capacitive loads must be isolated from the
output. The simplest way to achieve this isolation is to
add a small resistor (ROUT equal to 50Ω, for example)
in series with the output.
Figure 20 and Figure 21 illustrate graphs of
Small-Signal Overshoot vs Capacitive Load for
several values of ROUT. Also, refer to Applications
Bulletin AB-028 (literature number SBOA015,
available for download from the TI web site) for
details of analysis techniques and application circuits.
with total circuit noise calculated. The op amp itself
contributes both a voltage noise component and a
current noise component. The voltage noise is
commonly modeled as a time-varying component of
the offset voltage. The current noise is modeled as
the time-varying component of the input bias current
and reacts with the source resistance to create a
voltage component of noise. Therefore, the lowest
noise op amp for a given application depends on the
source impedance. For low source impedance,
current noise is negligible, and voltage noise
generally dominates. The OPA140, OPA2140, and
OPA4140 family has both low voltage noise and
extremely low current noise because of the FET input
of the op amp. As a result, the current noise
contribution of the OPAx140 series is negligible for
any practical source impedance, which makes it the
better choice for applications with high source
impedance.
The equation in Figure 34 shows the calculation of
the total circuit noise, with these parameters:
• en = voltage noise
• In = current noise
• RS = source impedance
• k = Boltzmann's constant = 1.38 × 10–23 J/K
• T = temperature in degrees Kelvin (K)
For more details on calculating noise, see the section
on Basic Noise Calculations.
10k
Votlage Noise Spectral Density, EO
The OPA140, OPA2140, and OPA4140 are unity-gain
stable, operational amplifiers with very low noise,
input bias current, and input offset voltage.
Applications with noisy or high-impedance power
supplies require decoupling capacitors placed close
to the device pins. In most cases, 0.1mF capacitors
are adequate. Figure 1 shows a simplified schematic
of the OPA140.
EO
OPA211
1k
RS
100
OPA140
Resistor Noise
10
2
2
2
EO = en + (in RS) + 4kTRS
1
100
1k
10k
100k
1M
Source Resistance, RS (W)
NOISE PERFORMANCE
Figure 34 shows the total circuit noise for varying
source impedances with the operational amplifier in a
unity-gain configuration (with no feedback resistor
network and therefore no additional noise
contributions). The OPA140 and OPA211 are shown
Figure 34. Noise Performance of the OPA140 and
OPA211 in Unity-Gain Buffer Configuration
Copyright © 2010, Texas Instruments Incorporated
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OPA2140, OPA4140
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BASIC NOISE CALCULATIONS
Figure 35 illustrates both noninverting (A) and
inverting (B) op amp circuit configurations with gain.
In circuit configurations with gain, the feedback
network resistors also contribute noise. In general,
the current noise of the op amp reacts with the
feedback resistors to create additional noise
components. However, the extremely low current
noise of the OPAx140 means that its current noise
contribution can be neglected.
Low-noise circuit design requires careful analysis of
all noise sources. External noise sources can
dominate in many cases; consider the effect of
source resistance on overall op amp noise
performance. Total noise of the circuit is the
root-sum-square
combination
of
all
noise
components.
The resistive portion of the source impedance
produces thermal noise proportional to the square
root of the resistance. This function is plotted in
Figure 34. The source impedance is usually fixed;
consequently, select the op amp and the feedback
resistors to minimize the respective contributions to
the total noise.
A) Noise in Noninverting Gain Configuration
The feedback resistor values can generally be
chosen to make these noise sources negligible. Note
that low impedance feedback resistors load the
output of the amplifier. The equations for total noise
are shown for both configurations.
space
Noise at the output:
R2
2
R2
EO2 = 1 +
R1
R1
2
en2 +
R2
2
e12 + e22 + 1 +
R1
R2
R1
es2
EO
RS
Where eS =
4kTRS = thermal noise of RS
e1 =
4kTR1 = thermal noise of R1
e2 =
4kTR2 = thermal noise of R2
VS
B) Noise in Inverting Gain Configuration
Noise at the output:
R2
2
R2
2
EO = 1 +
R1
RS
VS
R1 + RS
e n2 +
2
R2
R 1 + RS
e12 + e22 +
2
R2
R 1 + RS
e s2
EO
Where eS =
4kTRS = thermal noise of RS
e1 =
4kTR1 = thermal noise of R1
e2 =
4kTR2 = thermal noise of R2
For the OPAx140 series of operational amplifiers at 1kHz, en = 5.1nV/√Hz.
Figure 35. Noise Calculation in Gain Configurations
14
Copyright © 2010, Texas Instruments Incorporated
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SBOS498A – JULY 2010 – REVISED AUGUST 2010
PHASE-REVERSAL PROTECTION
The OPA140, OPA2140, and OPA4140 family has
internal phase-reversal protection. Many FET- and
bipolar-input op amps exhibit a phase reversal when
the input is driven beyond its linear common-mode
range. This condition is most often encountered in
noninverting circuits when the input is driven beyond
the specified common-mode voltage range, causing
the output to reverse into the opposite rail. The input
circuitry of the OPA140, OPA2140, and OPA4140
prevents
phase
reversal
with
excessive
common-mode voltage; instead, the output limits into
the appropriate rail (see Figure 22).
OUTPUT CURRENT LIMIT
The output current of the OPAx140 series is limited
by
internal
circuitry
to
+36mA/–30mA
(sourcing/sinking), to protect the device if the output
is accidentally shorted. This short-circuit current
depends on temperature, as shown in Figure 32.
POWER DISSIPATION AND THERMAL
PROTECTION
The OPAx140 series of op amps are capable of
driving 2kΩ loads with power-supply voltages of up to
±18V over the specified temperature range. In a
single-supply configuration, where the load is
connected to the negative supply voltage, the
minimum load resistance is 2.8kΩ at a supply voltage
of +36V. For lower supply voltages (either
single-supply or symmetrical supplies), a lower load
resistance may be used, as long as the output current
does not exceed 13mA; otherwise, the device
short-circuit current protection circuit may activate.
Internal power dissipation increases when operating
at high supply voltages. Copper leadframe
construction used in the OPA140, OPA2140, and
OPA4140 series devices improves heat dissipation
compared to conventional materials. Printed circuit
board (PCB) layout can also help reduce a possible
increase in junction temperature. Wide copper traces
help dissipate the heat by acting as an additional
heatsink. Temperature rise can be further minimized
by soldering the devices directly to the PCB rather
than using a socket.
Although the output current is limited by internal
protection circuitry, accidental shorting of one or more
output channels of a device can result in excessive
heating. For instance, when an output is shorted to
mid-supply, the typical short-circuit current of 36mA
leads to an internal power dissipation of over 600mW
at a supply of ±18V.
In the case of a dual OPA2140 in an MSOP-8
package (thermal resistance qJA = 180°C/W), such
power dissipation would lead the die temperature to
be 220°C above ambient temperature, when both
channels are shorted. This temperature increase
significantly decreases the operating life of the
device.
In order to prevent excessive heating, the OPAx140
series has an internal thermal shutdown circuit, which
shuts down the device if the die temperature exceeds
approximately +180°C. Once this thermal shutdown
circuit activates, a built-in hysteresis of 15°C ensures
that the die temperature must drop to approximately
+165°C before the device switches on again.
Additional consideration should be given to the
combination of maximum operating voltage,
maximum operating temperature, load, and package
type. Figure 36 and Figure 37 show several practical
considerations when evaluating the OPA2140 (dual
version) and the OPA4140 (quad version).
As an example, the OPA4140 has a maximum total
quiescent current of 10.8mA (2.7mA/channel) over
temperature. The TSSOP-14 package has a typical
thermal resistance of 135°C/W. This parameter
means that because the junction temperature should
not exceed +150°C in order to ensure reliable
operation, either the supply voltage must be reduced,
or the ambient temperature should remain low
enough so that the junction temperature does not
exceed +150°C. This condition is illustrated in
Figure 36 for various package types. Moreover,
resistive loading of the output causes additional
power dissipation and thus self-heating, which also
must be considered when establishing the maximum
supply voltage or operating temperature. To this end,
Figure 37 shows the maximum supply voltage versus
temperature for a worst-case dc load resistance of
2kΩ.
Copyright © 2010, Texas Instruments Incorporated
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15
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OPA2140, OPA4140
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particular semiconductor fabrication process and
specific circuits connected to the pin. Additionally,
internal electrostatic discharge (ESD) protection is
built into these circuits to protect them from
accidental ESD events both before and during
product assembly.
MAXIMUM SUPPLY VOLTAGE
(Quiescent Condition)
20
Maximum Supply Voltage (V)
18
16
14
12
10
8
6
TSSOP Quad
SOIC Quad
MSOP Dual
SOIC Dual
4
2
0
80
90
100
110
120
130
140
150
160
Ambient Temperature (?C)
Figure 36. Maximum Supply Voltage vs
Temperature (OPA2140 and OPA4140), Quiescent
Condition
MAXIMUM SUPPLY VOLTAGE
(Maximum DC Load on All Channels)
20
Maximum Supply Voltage (V)
18
16
14
12
10
8
6
TSSOP Quad
SOIC Quad
MSOP Dual
SOIC Dual
4
2
0
80
90
100
110
120
130
140
150
160
Ambient Temperature (?C)
Figure 37. Maximum Supply Voltage vs
Temperature (OPA2140 and OPA4140), Maximum
DC Load
ELECTRICAL OVERSTRESS
Designers often ask questions about the capability of
an operational amplifier to withstand electrical
overstress. These questions tend to focus on the
device inputs, but may involve the supply voltage pins
or even the output pin. Each of these different pin
functions have electrical stress limits determined by
the voltage breakdown characteristics of the
16
It is helpful to have a good understanding of this
basic ESD circuitry and its relevance to an electrical
overstress event. See Figure 38 for an illustration of
the ESD circuits contained in the OPAx140 series
(indicated by the dashed line area). The ESD
protection circuitry involves several current-steering
diodes connected from the input and output pins and
routed back to the internal power-supply lines, where
they meet at an absorption device internal to the
operational amplifier. This protection circuitry is
intended to remain inactive during normal circuit
operation.
An ESD event produces a short duration,
high-voltage pulse that is transformed into a short
duration, high-current pulse as it discharges through
a semiconductor device. The ESD protection circuits
are designed to provide a current path around the
operational amplifier core to prevent it from being
damaged. The energy absorbed by the protection
circuitry is then dissipated as heat.
When an ESD voltage develops across two or more
of the amplifier device pins, current flows through one
or more of the steering diodes. Depending on the
path that the current takes, the absorption device
may activate. The absorption device has a trigger, or
threshold voltage, that is above the normal operating
voltage of the OPAx140 but below the device
breakdown voltage level. Once this threshold is
exceeded, the absorption device quickly activates
and clamps the voltage across the supply rails to a
safe level.
When the operational amplifier connects into a circuit
such as the one Figure 38 shows, the ESD protection
components are intended to remain inactive and not
become involved in the application circuit operation.
However, circumstances may arise where an applied
voltage exceeds the operating voltage range of a
given pin. Should this condition occur, there is a risk
that some of the internal ESD protection circuits may
be biased on, and conduct current. Any such current
flow occurs through steering diode paths and rarely
involves the absorption device.
Copyright © 2010, Texas Instruments Incorporated
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SBOS498A – JULY 2010 – REVISED AUGUST 2010
Figure 38 depicts a specific example where the input
voltage, VIN, exceeds the positive supply voltage
(+VS) by 500mV or more. Much of what happens in
the circuit depends on the supply characteristics. If
+VS can sink the current, one of the upper input
steering diodes conducts and directs current to +VS.
Excessively high current levels can flow with
increasingly higher VIN. As a result, the datasheet
specifications recommend that applications limit the
input current to 10mA.
Again, it depends on the supply characteristic while at
0V, or at a level below the input signal amplitude. If
the supplies appear as high impedance, then the
operational amplifier supply current may be supplied
by the input source via the current steering diodes.
This state is not a normal bias condition; the amplifier
most likely will not operate normally. If the supplies
are low impedance, then the current through the
steering diodes can become quite high. The current
level depends on the ability of the input source to
deliver current, and any resistance in the input path.
If the supply is not capable of sinking the current, VIN
may begin sourcing current to the operational
amplifier, and then take over as the source of positive
supply voltage. The danger in this case is that the
voltage can rise to levels that exceed the operational
amplifier absolute maximum ratings.
If there is an uncertainty about the ability of the
supply to absorb this current, external zener diodes
may be added to the supply pins as shown in
Figure 38. The zener voltage must be selected such
that the diode does not turn on during normal
operation.
Another common question involves what happens to
the amplifier if an input signal is applied to the input
while the power supplies +VS and/or –VS are at 0V.
However, its zener voltage should be low enough so
that the zener diode conducts if the supply pin begins
to rise above the safe operating supply voltage level.
(2)
TVS
RF
+VS
+V
OPA140
RI
ESD CurrentSteering Diodes
-In
(3)
RS
+In
Op Amp
Core
Edge-Triggered ESD
Absorption Circuit
ID
VIN
Out
RL
(1)
-V
-VS
(2)
TVS
(1)
VIN = +VS + 500mV.
(2)
TVS: +VS(max) > VTVSBR (Min) > +VS
(3)
Suggested value approximately 1kΩ.
Figure 38. Equivalent Internal ESD Circuitry and Its Relation to a Typical Circuit Application
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): OPA140 OPA2140 OPA4140
17
PACKAGE OPTION ADDENDUM
www.ti.com
11-Oct-2010
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
Samples
(Requires Login)
OPA140AID
PREVIEW
SOIC
D
8
75
TBD
Call TI
Call TI
Samples Not Available
OPA140AIDBVR
PREVIEW
SOT-23
DBV
5
3000
TBD
Call TI
Call TI
Samples Not Available
OPA140AIDBVT
PREVIEW
SOT-23
DBV
5
250
TBD
Call TI
Call TI
Samples Not Available
OPA140AIDGKT
PREVIEW
MSOP
DGK
8
250
TBD
Call TI
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Samples Not Available
OPA140AIDR
PREVIEW
SOIC
D
8
2500
TBD
Call TI
Call TI
Samples Not Available
OPA140IDGKR
PREVIEW
MSOP
DGK
8
TBD
Call TI
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Samples Not Available
OPA2140AID
PREVIEW
SOIC
D
8
75
TBD
Call TI
Call TI
Samples Not Available
OPA2140AIDGKR
ACTIVE
MSOP
DGK
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Purchase Samples
OPA2140AIDGKT
ACTIVE
MSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Request Free Samples
OPA2140AIDR
PREVIEW
SOIC
D
8
2500
TBD
Call TI
Call TI
Samples Not Available
OPA4140AID
PREVIEW
SOIC
D
14
50
TBD
Call TI
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Samples Not Available
OPA4140AIDR
PREVIEW
SOIC
D
14
2500
TBD
Call TI
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Samples Not Available
OPA4140AIPW
PREVIEW
TSSOP
PW
14
90
TBD
Call TI
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Samples Not Available
OPA4140AIPWR
PREVIEW
TSSOP
PW
14
2000
TBD
Call TI
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Samples Not Available
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
(3)
11-Oct-2010
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DLP® Products
www.dlp.com
Communications and
Telecom
www.ti.com/communications
DSP
dsp.ti.com
Computers and
Peripherals
www.ti.com/computers
Clocks and Timers
www.ti.com/clocks
Consumer Electronics
www.ti.com/consumer-apps
Interface
interface.ti.com
Energy
www.ti.com/energy
Logic
logic.ti.com
Industrial
www.ti.com/industrial
Power Mgmt
power.ti.com
Medical
www.ti.com/medical
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Space, Avionics &
Defense
www.ti.com/space-avionics-defense
RF/IF and ZigBee® Solutions www.ti.com/lprf
Video and Imaging
www.ti.com/video
Wireless
www.ti.com/wireless-apps
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2010, Texas Instruments Incorporated
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