OPA379
OPA2379
OPA4379
1
FEATURES
DESCRIPTION
APPLICATIONS
VS
VS
C1
C2
RB
REF
C
S
W
RL
RF
R1
R1
1/2
OPA2379 VOUT
1/2
OPA2379
OPA379
OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
1.8V, 2.9 µA, 90kHz, Rail-to-Rail I/OOPERATIONAL AMPLIFIERS
2
•LOW NOISE: 2.8 µV
PP
(0.1Hz - 10Hz)
The OPA379 family of micropower, low-voltage•microPower: 5.5 µA (max)
operational amplifiers is designed for battery-powered•LOW OFFSET VOLTAGE: 1.5mV (max)
applications. These amplifiers operate on a supply•DC PRECISION:
voltage as low as 1.8V ( ± 0.9V). High-performance,single-supply operation with rail-to-rail capability– CMRR: 100dB
(10 µV max) makes the OPA379 family useful for a– PSRR: 2 µV/V
wide range of applications.– A
OL
: 120dB
In addition to microSize packages, the OPA379 family•WIDE SUPPLY VOLTAGE RANGE: 1.8V to 5.5V
of op amps features impressive bandwidth (90kHz),•microSize PACKAGES:
low bias current (5pA), and low noise (80nV/ √Hz)relative to the very low quiescent current (5.5 µA– SC70-5, SOT23-5, SOT23-8, SO-8, TSSOP-14
max).
The OPA379 (single) is available in SC70-5,SOT23-5, and SO-8 packages. The OPA2379 (dual)•BATTERY-POWERED INSTRUMENTS
comes in SOT23-8 and SO-8 packages. The•PORTABLE DEVICES
OPA4379 (quad) is offered in a TSSOP-14 package.•MEDICAL INSTRUMENTS
All versions are specified from – 40 °C to +125 °C.•HANDHELD TEST EQUIPMENT
xxxxxx
xxxxxx
xxxxxx
xxx
Table 1. OPAx379 RELATED PRODUCTSFEATURES PRODUCT
1µA, 70kHz, 2mV V
OS
, 1.8V to 5.5V Supply OPAx349
1µA, 5.5kHz, 390 µV V
OS
, 2.5V to 16V Supply TLV240x
1µA, 5.5kHz, 0.6mV V
OS
, 2.5V to 12V Supply TLV224x
7µA, 160kHz, 0.5mV V
OS
, 2.7V to 16V Supply TLV27Lx
7µA, 160kHz, 0.5mV V
OS
, 2.7V to 16V Supply TLV238x
20 µA, 350kHz, 2mV V
OS
, 2.3V to 5.5V Supply OPAx347
20 µA, 500kHz, 550 µV V
OS
, 1.8V to 3.6V Supply TLV276x
45 µA, 1MHz, 1mV V
OS
, 2.1V to 5.5V Supply OPAx348
Figure 1. OPA2379 in Portable Gas MeterApplication
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005 – 2008, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
ABSOLUTE MAXIMUM RATINGS
(1)
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled withappropriate 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 moresusceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
Over operating free-air temperature range (unless otherwise noted).
OPA379, OPA2379, OPA4379 UNIT
Supply Voltage V
S
= (V+) – (V – ) +7 VSignal Input Terminals, Voltage
(2)
(V – ) – 0.5 to (V+) + 0.5 VSignal Input Terminals, Current
(2)
± 10 mAOutput Short-Circuit
(3)
ContinuousOperating Temperature T
A
– 40 to +125 °CStorage Temperature T
A
– 65 to +150 °CJunction Temperature T
J
+150 °CHuman Body Model (HBM) 2000 VESD Rating
Charged Device Model (CDM) 1000 V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods maydegrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyondthose specified is not supported.(2) Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.5V beyond the supply rails shouldbe current-limited to 10mA or less.(3) Short-circuit to ground, one amplifier per package.
PACKAGE/ORDERING INFORMATION
(1)
PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING
SC70 −5 DCK AYROPA379 SOT23 −5 DBV B53SO −8 D OPA379ASOT23 −8 DCN B61OPA2379
SO −8 D OPA2379AOPA4379 TSSOP −14 PW OPA4379A
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TIweb site at www.ti.com .
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Product Folder Link(s): OPA379 OPA2379 OPA4379
PIN CONFIGURATIONS
1
2
3
5
4
V+
OUT
+IN
V-
-IN
1
2
3
5
4
V+
-IN
OUT
V-
+IN
1
2
3
4
8
7
6
5
V+
OUTB
-INB
+INB
OUTA
-IN
+IN
V-
B61
1
2
3
4
8
7
6
5
NC(1)
V+
OUT
NC(1)
NC(1)
-IN
+IN
V-
1
2
3
4
8
7
6
5
V+
OUTB
-INB
+INB
OUTA
-INA
+INA
V-
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUTD
-IND
+IND
V-
+INC
-INC
OUTC
OUTA
-INA
+INA
V+
+INB
-INB
OUTB
OPA379
OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
OPA379 OPA379SC70-5 SOT23-5(TOP VIEW) (TOP VIEW)
OPA379 OPA2379
(2)
SO-8 SOT23-8(TOP VIEW) (TOP VIEW)
OPA2379 OPA4379SO-8 TSSOP-14(TOP VIEW) (TOP VIEW)
(1) NC denotes no internal connection.(2) Pin 1 of the SOT23 −8 package is determined by orienting thepackage marking as shown.
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ELECTRICAL CHARACTERISTICS: V
S
= +1.8V to +5.5V
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
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Boldface limits apply over the specified temperature range indicated.At T
A
= +25 °C, R
L
= 25k Ωconnected to V
S
/2, and V
CM
< (V+) – 1V, unless otherwise noted.
OPA379, OPA2379, OPA4379
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OFFSET VOLTAGE
Initial Offset Voltage V
OS
V
S
= 5V 0.4 1.5 mV
Over – 40 °C to +125 °C 2 mV
Drift, – 40 °C to +85 °C dV
OS
/dT 1.5 µV/ °C
Drift, – 40 °C to +125 °C 2.7 µV/ °C
vs Power Supply PSRR 2 10 µV/V
Over – 40 °C to +125 °C 20 µV/V
INPUT VOLTAGE RANGE
Common-Mode Voltage Range V
CM
(V – ) – 0.1 to (V+) + 0.1 V
Common-Mode Rejection Ratio
(1)
CMRR (V – ) < V
CM
< (V+) – 1V 90 100 dB
Over – 40 °C to +85 °C (V – ) < V
CM
< (V+) – 1V 80 dB
Over – 40 °C to +125 °C (V – ) < V
CM
< (V+) – 1V 62 dB
INPUT BIAS CURRENT
Input Bias Current I
B
V
S
= 5V, V
CM
≤V
S
/2 ± 5 ± 50 pA
Input Offset Current I
OS
V
S
= 5V ± 5 ± 50 pA
INPUT IMPEDANCE
Differential Ω|| pF10
13
|| 3
Common-Mode Ω|| pF10
13
|| 6
NOISE
Input Voltage Noise f = 0.1Hz to 10Hz 2.8 µV
PP
Input Voltage Noise Density e
n
f = 1kHz 80 nV/ √Hz
Input Current Noise Density i
n
f = 1kHz 1 fA/ √Hz
OPEN-LOOP GAIN
Open-Loop Voltage Gain A
OL
V
S
= 5V, R
L
= 25k Ω, 100mV < V
O
< (V+) – 100mV 100 120 dB
Over – 40 °C to +125 °C V
S
= 5V, R
L
= 25k Ω, 100mV < V
O
< (V+) – 100mV 80 dB
V
S
= 5V, R
L
= 5k Ω, 500mV < V
O
< (V+) – 500mV 100 120 dB
Over – 40 °C to +125 °C V
S
= 5V, R
L
= 5k Ω, 500mV < V
O
< (V+) – 500mV 80 dB
OUTPUT
Voltage Output Swing from Rail R
L
= 25k Ω5 10 mV
Over – 40 °C to +125 °C R
L
= 25k Ω15 mV
R
L
= 5k Ω25 50 mV
Over – 40 °C to +125 °C R
L
= 5k Ω75 mV
Short-Circuit Current I
SC
± 5 mA
Capacitive Load Drive C
LOAD
See Typical Characteristics
Closed-Loop Output Impedance R
OUT
G = 1, f = 1kHz, I
O
= 0 10 Ω
Open-Loop Output Impedance R
O
f = 100kHz, I
O
= 0 28 k Ω
FREQUENCY RESPONSE C
LOAD
= 30pF
Gain Bandwidth Product GBW 90 kHz
Slew Rate SR G = +1 0.03 V/ µs
Overload Recovery Time V
IN
×GAIN > V
S
25 µs
Turn-On Time t
ON
1 ms
(1) See Typical Characteristic gragh, Common-Mode Rejection Ratio vs Frequency (Figure 3 ).
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OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
ELECTRICAL CHARACTERISTICS: V
S
= +1.8V to +5.5V (continued)Boldface limits apply over the specified temperature range indicated.At T
A
= +25 °C, R
L
= 25k Ωconnected to V
S
/2, and V
CM
< (V+) – 1V, unless otherwise noted.
OPA379, OPA2379, OPA4379
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER SUPPLY
Specified/Operating Voltage Range V
S
1.8 5.5 V
Quiescent Current per Amplifier I
Q
V
S
= 5.5V, I
O
= 0 2.9 5.5 µA
Over – 40 °C to +125 °C 10 µA
TEMPERATURE
Specified/Operating Range T
A
– 40 +125 °C
Storage Range T
J
– 65 +150 °C
Thermal Resistance θ
JA
SC70 −5 250 °C/W
SOT23 −5 200 °C/W
SOT23 −8, TSSOP −14, SO −8 150 °C/W
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TYPICAL CHARACTERISTICS
120
100
80
60
40
20
0
Frequency(Hz)
Gain(dB)
0
-30
-60
-90
-120
-150
-180
Phase( )°
0.1 1 1k10 100 10k 100k
3.5
3.0
2.5
2.0
1.5
SupplyVoltage(V)
QuiescentCurrent( A)m
1.5 2.0 3.52.5 3.0 4.0 4.5 5.0 5.5
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
I (mA)
OUT
V(V)
OUT
0 1 2 3 4 5 6 7 8 9 10
+125 C°
V = ±2.5V
S
+85 C°+25 C° - °40 C
25
20
15
10
5
+ISC
-ISC
SupplyVoltage(V)
Short-CircuitCurrent(mA)
1.5 2.0 3.52.5 3.0 4.0 4.5 5.0 5.5
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
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At T
A
= +25 °C, V
S
= 5V, and R
L
= 25k Ωconnected to V
S
/2, unless otherwise noted.
COMMON-MODE ANDOPEN-LOOP GAIN AND PHASE POWER-SUPPLY REJECTION RATIOvs FREQUENCY vs FREQUENCY
Figure 2. Figure 3.
MAXIMUM OUTPUT VOLTAGE QUIESCENT CURRENTvs FREQUENCY vs SUPPLY VOLTAGE
Figure 4. Figure 5.
OUTPUT VOLTAGE SHORT-CIRCUIT CURRENTvs OUTPUT CURRENT vs SUPPLY VOLTAGE
Figure 6. Figure 7.
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15.0
12.5
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
-15.0
Common-ModeVoltage(V)
OffsetVoltage(mV)
0
CMRRSpecifiedRange
Common-ModeInputRange
Unit1
Unit2
+125 C°
+85 C°
- °40 C
-0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OffsetVoltage( V)m
Population
-1500
-1350
-1200
-1050
-900
-750
-600
-450
-300
-150
0
150
300
450
600
750
900
1050
1200
1350
1500
OffsetVoltageDrift( V/ C)m °
Population
£1£2£3£4£5 >5
OffsetVoltageDrift( V/ C)m °
Population
£1£2£3£4£5 >5
QuiescentCurrent( A)m
Population
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
OPA379
OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
TYPICAL CHARACTERISTICS (continued)At T
A
= +25 °C, V
S
= 5V, and R
L
= 25k Ωconnected to V
S
/2, unless otherwise noted.
OFFSET VOLTAGE vs COMMON-MODE VOLTAGE OFFSET VOLTAGEvs TEMPERATURE PRODUCTION DISTRIBUTION
Figure 8. Figure 9.
OFFSET VOLTAGE DRIFT DISTRIBUTION OFFSET VOLTAGE DRIFT DISTRIBUTION( – 40 °C to +85 °C) ( – 40 °C to +125 °C)
Figure 10. Figure 11.
QUIESCENT CURRENT QUIESCENT CURRENTvs TEMPERATURE PRODUCTION DISTRIBUTION
Figure 12. Figure 13.
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1 V/divm
2.5s/div
10000
1000
100
10
1
0.1
0.01
Temperature(°C)
InputBiasCurrent(pA)
-50 0-25 7525 50 100 125
1000
100
10
Frequency(Hz)
Noise(nV/ )
ÖHz
1 10010 1k 10k
60
50
40
30
20
10
0
CapacitiveLoad(pF)
Overshoot(%)
10 100 1000
G=+1
G= 1-
20mV/div
25 s/divm
500mV/div
50 s/divm
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
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TYPICAL CHARACTERISTICS (continued)At T
A
= +25 °C, V
S
= 5V, and R
L
= 25k Ωconnected to V
S
/2, unless otherwise noted.
INPUT BIAS CURRENTvs TEMPERATURE 0.1Hz TO 10Hz NOISE
Figure 14. Figure 15.
SMALL-SIGNAL OVERSHOOTNOISE vs FREQUENCY vs CAPACITIVE LOAD
Figure 16. Figure 17.
SMALL-SIGNAL STEP RESPONSE LARGE-SIGNAL STEP RESPONSE
Figure 18. Figure 19.
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APPLICATION INFORMATION
5kW
OPA379
10mAmax
VS
VIN
VOUT
IOVERLOAD
NOISE
OPERATING VOLTAGE
CAPACITIVE LOAD AND STABILITY
INPUT COMMON-MODE VOLTAGE RANGE
PROTECTING INPUTS FROM
10 toW
20W
OPA379
VS
VIN
VOUT
RS
RLCL
OPA379
OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
The OPA379 family of operational amplifiersminimizes power consumption without compromisingbandwidth or noise. Power-supply rejection ratio(PSRR), common-mode rejection ratio (CMRR), andopen-loop gain (A
OL
) typical values are 100dB orbetter.
When designing for ultra-low power, choose systemcomponents carefully. To minimize currentconsumption, select large-value resistors. Any
Figure 20. Input Current Protection for Voltagesresistors will react with stray capacitance in the circuit
Exceeding the Supply Voltageand the input capacitance of the operational amplifier.These parasitic RC combinations can affect thestability of the overall system. A feedback capacitormay be required to assure stability and limit
Although micropower amplifiers frequently have highovershoot or gain peaking.
wideband noise, the OPA379 series offer excellentGood layout practice mandates the use of a 0.1 µF
noise performance. Resistors should be chosenbypass capacitor placed closely across the supply
carefully because the OPA379 has only 2.8 µV
PP
ofpins.
0.1Hz to 10Hz noise, and 80nV/ √Hz of widebandnoise; otherwise, they can become the dominantsource of noise.OPA379 series op amps are fully specified and testedfrom +1.8V to +5.5V ( ± 0.9V to ± 2.75V). Parametersthat will vary with supply voltage are shown in the
Follower configurations with load capacitance inTypical Characteristics curves.
excess of 30pF can produce extra overshoot (seetypical characteristic Small-Signal Overshoot vsCapacitive Load,Figure 17 ) and ringing in the outputsignal. Increasing the gain enhances the ability of theThe input common-mode voltage range of the
amplifier to drive greater capacitive loads. InOPA379 family typically extends 100mV beyond each
unity-gain configurations, capacitive load drive can besupply rail. This rail-to-rail input is achieved using a
improved by inserting a small (10 Ωto 20 Ω) resistor,complementary input stage. CMRR is specified from
R
S
, in series with the output, as shown in Figure 21 .the negative rail to 1V below the positive rail.
This resistor significantly reduces ringing whileBetween (V+) – 1V and (V+) + 0.1V, the amplifier
maintaining direct current (dc) performance for purelyoperates with higher offset voltage because of the
capacitive loads. However, if there is a resistive loadtransition region of the input stage. See the typical
in parallel with the capacitive load, a voltage divider ischaracteristic, Offset Voltage vs Common-Mode
created, introducing a dc error at the output andVoltage vs Temperature (Figure 8 ).
slightly reducing the output swing. The errorintroduced is proportional to the ratio R
S
/R
L
, and isgenerally negligible.OVER-VOLTAGE
Normally, input currents are 5pA. However, a largevoltage input (greater than 500mV beyond the supplyrails) can cause excessive current to flow in or out ofthe input pins. Therefore, as well as keeping the inputvoltage below the maximum rating, it is also importantto limit the input current to less than 10mA. Thislimiting is easily accomplished with an input voltageresistor, as shown in Figure 20 .
Figure 21. Series Resistor in Unity-Gain BufferConfiguration Improves Capacitive Load Drive
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R =
F
VREF
1000(I )
BMAX
=1.2V
1000(100pA)
=12M 10M» WW
(1)
R =R
1F
VHYST
VBATT
=10MW50mW
2.4V =210kW
(2)
RIN
OPA379
VIN
VOUT
RF
CFB
CIN
BATTERY MONITORING
R =
2
1
-
VTHRS
V R´
REF 1
1
R1
-1
RF
=1
-
2V
1.2V ´210kW
1
210kW-1
10MW
=325kW
(3)
R =
BIAS
(V V )-REFBATTMIN
IBIAS
=(1.8V 1.2V)-
2 Am=0.3MW
(4)
REF1112
OPA379
+IN
OUT
-IN VSTATUS
VBATT
VREF
R1
R2
RBIAS
IBIAS
RF
+
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
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In unity-gain inverter configuration, phase margin canbe reduced by the reaction between the capacitanceat the op amp input and the gain setting resistors.Best performance is achieved by using smallervalued resistors. However, when large valuedresistors cannot be avoided, a small (4pF to 6pF)capacitor, C
FB
, can be inserted in the feedback, asshown in Figure 22 . This configuration significantly 2. Choose the hysteresis voltage, V
HYST
. For batteryreduces overshoot by compensating the effect of monitoring applications, 50mV is adequate.capacitance, C
IN
, which includes the amplifier input
3. Calculate R
1
as follows:capacitance (3pf) and printed circuit board (PC)parasitic capacitance.
4. Select a threshold voltage for V
IN
rising (V
THRS
) =2.0V
5. Calculate R
2
as follows:
Figure 22. Improving Stability for Large R
F
and R
IN
The low operating voltage and quiescent current of
6. Calculate R
BIAS
: The minimum supply voltage forthe OPA379 series make it an excellent choice for
this circuit is 1.8V. The REF1112 has a currentbattery monitoring applications, as shown in
requirement of 1.2 µA (max). Providing 2 µA ofFigure 23 . In this circuit, V
STATUS
is high as long as
supply current assures proper operation.the battery voltage remains above 2V. A low-power
Therefore:reference is used to set the trip point. Resistor valuesare selected as follows:1. R
F
Selecting: Select R
F
such that the currentthrough R
F
is approximately 1000x larger thanthe maximum bias current over temperature:
Figure 23. Battery Monitor
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WINDOW COMPARATOR
V =
H
R2
R +R
1 2
´VS
(5)
V =
L
R4
R +R
3 4
´VS
(6)
VS
A1
A2
D1(2)
D2(2)
R5
10kW
R6
5.1kW
R7
5.1kW
R
2kW(1)
IN
VS
VS
Q1(3)
R1
VH
VL
R2
1/2
OPA2379
1/2
OPA2379
VS
VOUT
VIN
VS
R3
R4
OPA379
OPA2379
OPA4379
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................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
The window comparator threshold voltages are set asfollows:Figure 24 shows the OPA2379 used as a windowcomparator. The threshold limits are set by V
H
andV
L
, with V
H
> V
L
. When V
IN
< V
H
, the output of A1 islow. When V
IN
> V
L
, the output of A2 is low.Therefore, both op amp outputs are at 0V as long asV
IN
is between V
H
and V
L
. This architecture results inno current flowing through either diode, Q1 in cutoff,with the base voltage at 0V, and V
OUT
forced high.
If V
IN
falls below V
L
, the output of A2 is high, currentflows through D2, and V
OUT
is low. Likewise, if V
INrises above V
H
, the output of A1 is high, current flowsthrough D1, and V
OUT
is low.
(1) R
IN
protects A1 and A2 from possible excess current flow.(2) IN4446 or equivalent diodes.(3) 2N2222 or equivalent NPN transistor.
Figure 24. OPA2379 as a Window Comparator
Copyright © 2005 – 2008, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Link(s): OPA379 OPA2379 OPA4379
ADDITIONAL APPLICATION EXAMPLES
R3R2
VIN
+2.7V
R
66.5
1
W
C
1.5nF
1
C
1 F
2
m
VREF
A0+
REF3312
+2.7V
VCC
VSS
16-Bit
ADC
MSP430x20x3PW
OPA379
R1
VEX
VOUT
VREF
R1
OPA379
R
R
R R
VS
OPA379
ADS1100
Load
V
I C
2
R1
4.99kW
R3
4.99kW
R4
48.7kW
R2
49.9kW
+5V
3V
REF3130
R7
1.18kW
RSHUNT
1W
R6
71.5kWRN
56W
RN
56W
(PGAGain=4)
FS=3.0V
StrayGround-LoopResistance
ILOAD
OPA379
OPA2379
OPA4379
SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ...................................................................................................................................................
www.ti.com
Figure 25 through Figure 29 illustrate additional application examples.
Figure 25. Unipolar Signal Chain Configuration
Figure 26. Single Op Amp Bridge Amplifier
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 27. Low-Side Current Monitor
12 Submit Documentation Feedback Copyright © 2005 – 2008, Texas Instruments Incorporated
Product Folder Link(s): OPA379 OPA2379 OPA4379
OPA379
Output
RSHUNT
Load
V+
RG
RL
R(2)
1
10kW
RBIAS
+5V
zener(1)
Twozener
biasingmethods
areshown.(3)
MOSFETratedto
stand-offsupplyvoltage
suchasBSS84for
upto50V.
V-
R2
V = (V -V )1+++V
OUT 1 2 REF
R1
R2
RG
R2
R1
VREF VOUT
V2
V1
R1
1/2
OPA2379
1/2
OPA2379
2R1
RG
OPA379
OPA2379
OPA4379
www.ti.com
................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008
(1) Zener rated for op amp supply capability (that is, 5.1V for OPA379).(2) Current-limiting resistor.(3) Choose zener biasing resistor or dual NMOSMETs (FDG6301N, NTJD4001N, or Si1034).
Figure 28. High-Side Current Monitor
Figure 29. Two Op Amp Instrumentation Amplifier
Copyright © 2005 – 2008, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Link(s): OPA379 OPA2379 OPA4379
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
OPA2379AID ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDCNR ACTIVE SOT-23 DCN 8 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDCNRG4 ACTIVE SOT-23 DCN 8 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDCNT ACTIVE SOT-23 DCN 8 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDCNTG4 ACTIVE SOT-23 DCN 8 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDG4 ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDR ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA2379AIDRG4 ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AID ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDCKR ACTIVE SC70 DCK 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDCKRG4 ACTIVE SC70 DCK 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDCKT ACTIVE SC70 DCK 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDCKTG4 ACTIVE SC70 DCK 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDG4 ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDR ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA379AIDRG4 ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA4379AIPWR ACTIVE TSSOP PW 14 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA4379AIPWRG4 ACTIVE TSSOP PW 14 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
OPA4379AIPWT PREVIEW TSSOP PW 14 250 TBD Call TI Call TI
(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
PACKAGE OPTION ADDENDUM
www.ti.com 11-Jul-2008
Addendum-Page 1
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)
(3) 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.
PACKAGE OPTION ADDENDUM
www.ti.com 11-Jul-2008
Addendum-Page 2
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0 (mm) B0 (mm) K0 (mm) P1
(mm) W
(mm) Pin1
Quadrant
OPA2379AIDCNR SOT-23 DCN 8 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
OPA2379AIDCNT SOT-23 DCN 8 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
OPA2379AIDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
OPA379AIDBVR SOT-23 DBV 5 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
OPA379AIDBVT SOT-23 DBV 5 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
OPA379AIDCKR SC70 DCK 5 3000 179.0 8.4 2.2 2.5 1.2 4.0 8.0 Q3
OPA379AIDCKR SC70 DCK 5 3000 180.0 8.4 2.3 2.52 1.2 4.0 8.0 Q3
OPA379AIDCKT SC70 DCK 5 250 180.0 8.4 2.3 2.52 1.2 4.0 8.0 Q3
OPA379AIDCKT SC70 DCK 5 250 179.0 8.4 2.2 2.5 1.2 4.0 8.0 Q3
OPA379AIDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 24-Jan-2009
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
OPA2379AIDCNR SOT-23 DCN 8 3000 190.5 212.7 31.8
OPA2379AIDCNT SOT-23 DCN 8 250 190.5 212.7 31.8
OPA2379AIDR SOIC D 8 2500 346.0 346.0 29.0
OPA379AIDBVR SOT-23 DBV 5 3000 190.5 212.7 31.8
OPA379AIDBVT SOT-23 DBV 5 250 190.5 212.7 31.8
OPA379AIDCKR SC70 DCK 5 3000 195.0 200.0 45.0
OPA379AIDCKR SC70 DCK 5 3000 190.5 212.7 31.8
OPA379AIDCKT SC70 DCK 5 250 190.5 212.7 31.8
OPA379AIDCKT SC70 DCK 5 250 195.0 200.0 45.0
OPA379AIDR SOIC D 8 2500 346.0 346.0 29.0
PACKAGE MATERIALS INFORMATION
www.ti.com 24-Jan-2009
Pack Materials-Page 2
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,65 M
0,10
0,10
0,25
0,50
0,75
0,15 NOM
Gage Plane
28
9,80
9,60
24
7,90
7,70
2016
6,60
6,40
4040064/F 01/97
0,30
6,60
6,20
80,19
4,30
4,50
7
0,15
14
A
1
1,20 MAX
14
5,10
4,90
8
3,10
2,90
A MAX
A MIN
DIM PINS **
0,05
4,90
5,10
Seating Plane
0°–8°
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
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