TI1 INA146UAE4 High-voltage, programmable gain difference amplifier Datasheet

®
INA146
INA
146
For most current data sheet and other product
information, visit www.burr-brown.com
High-Voltage, Programmable Gain
DIFFERENCE AMPLIFIER
FEATURES
DESCRIPTION
● HIGH COMMON-MODE VOLTAGE:
+40V at VS = +5V
±100V at VS = ±15V
● DIFFERENTIAL GAIN = 0.1V/V TO 100V/V:
Set with External Resistors
● LOW QUIESCENT CURRENT: 570µA
● WIDE SUPPLY RANGE:
Single Supply: 4.5V to 36V
Dual Supplies: ±2.25V to ±18V
● LOW GAIN ERROR: 0.025%
● HIGH CMR: 80dB
● SO-8 PACKAGE
The INA146 is a precision difference amplifier that
can be used to accurately attenuate high differential
voltages and reject high common-mode voltages for
compatibility with common signal processing voltage
levels. High-voltage capability also affords inherent
input protection. The input common-mode range extends beyond both supply rails, making the INA146
well-suited for both single and dual supply applications.
On-chip precision resistors are laser-trimmed to achieve
accurate gain and high common-mode rejection. Excellent TCR tracking of these resistors assures continued high precision over temperature.
A 10:1 difference amplifier provides 0.1V/V gain
when the output amplifier is used as a unity-gain
buffer. In this configuration, input voltages up to
±100V can be measured. Gains greater than 0.1V/V
can be set with an external resistor pair without affecting the common-mode input range.
APPLICATIONS
●
●
●
●
CURRENT SHUNT MEASUREMENTS
SENSOR AMPLIFIER
SYNCHRONOUS DEMODULATOR
CURRENT AND DIFFERENTIAL LINE
RECEIVER
● VOLTAGE-CONTROLLED CURRENT
SOURCE
● BATTERY POWERED SYSTEMS
● LOW COST AUTOMOTIVE
V+
INSTRUMENTATION
The INA146 is available in the SO-8 surface-mount
package specified for the extended industrial temperature range, –40°C to +85°C.
RG1
7
VIN–
2
RG2
5
R1
100kΩ
R2
10kΩ
R5
10kΩ
(1%)
G = 0.1
A2
6
A1
VO
+
–
VO = (VIN – VIN) 0.1 (1 + RG2/RG1)
+
VIN
3
R4
10kΩ
R3
100kΩ
INA146
4
V–
1
8
Ref
V01
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
©1999 Burr-Brown Corporation
SBOS109
PDS-1491A
1
INA146
Printed in U.S.A. September, 1999
SPECIFICATIONS: VS = ±2.25V to ±18V Dual Supplies
At TA = +25°C, G = 0.1, RL = 10kΩ connected to ground and ref pin connected to ground unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
INA146UA
PARAMETER
CONDITION
OFFSET VOLTAGE, VO
Input Offset Voltage
vs Temperature
vs Power Supply
vs Time
Offset Voltage, V01
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
Over Temperature
MIN
TYP
MAX
UNITS
±1
See Typical Curve
±100
±3
±1
±5
mV
±600
µV/V
µV/mo
mV
±100(3)
80
74
V
dB
dB
±50
±5
nA
nA
110
91.7
55
kΩ
kΩ
kΩ
10
550
µVp-p
nV/√Hz
RTI(1, 2)
VOS
∆VOS /∆T
PSRR
VS = ±15, VCM = VO = 0V
VS = ±1.35V to ±18V
RTI(1, 2)
VCM
CMRR
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
(VIN+) – (VIN–) = 0V, VO = 0V
VCM = 11 (V–) to 11 (V+) = 11, RS = 0Ω
70
64
VCM = VS /2
IB
IOS
INPUT IMPEDANCE
Differential (non-inverting input)
Differential (inverting input)
Common-Mode
NOISE
Voltage Noise, f = 0.1Hz to 10Hz
Voltage Noise Density, f = 1kHz
RTI(1, 4)
en
GAIN
Gain Equation
Initial(1)
Gain Error
vs Temperature
G = 0.1 to 100
G = 0.1 • (1 + RG2 /RG1)
0.1
±0.025
±0.1
±1
±10
±0.025
±0.1
±1
±10
±0.001
±0.01
RL = 100kΩ, VO = (V–)+0.15 to (V+)–1, G = 1
RL = 100kΩ, VO = (V–)+0.25 to (V+)–1, G = 1
RL = 10kΩ, VO = (V–)+0.3 to (V+)–1.25, G = 1
RL = 10kΩ, VO = (V–)+0.5 to (V+)–1.25, G = 1
VO = (V–)+0.3 to (V+)–1.25, G = 1
vs Temperature
Nonlinearity
FREQUENCY RESPONSE
Small Signal Bandwidth
G = 0.1
G=1
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery
G = 1, 10V Step
G = 1, 10V Step
50% Input Overload
OUTPUT, VO
Voltage Output
Over Temperature
RL = 100kΩ, G = 1
RL = 100kΩ, G = 1
RL = 10kΩ, G = 1
RL = 10kΩ, G = 1
Continuous to Common
Stable Operation
Over Temperature
Short-Circuit Current
Capacitive Load
POWER SUPPLY
Specified Voltage Range, Dual Supplies
Operating Voltage Range
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
550
50
0.45
40
80
40
(V–) + 0.15
(V–) + 0.25
(V–) + 0.3
(V–) + 0.5
VIN = 0, IO = 0
±570
–40
–55
–55
θJA
kHz
kHz
V/µs
µs
µs
µs
(V+) – 1
(V+) – 1
(V+) – 1.25
(V+) – 1.25
V
V
V
V
mA
pF
±18
±18
±700
±750
V
V
µA
µA
+85
+125
+125
°C
°C
°C
°C/W
±15
1000
±2.25
±1.35
150
V/V
V/V
%
ppm / °C
%
ppm / °C
% of FS
NOTES: (1) Overall difference amplifier configuration. Referred to input pins (VIN+ and VIN–), gain = 0.1V/V. Specified with 10kΩ in feedback of A2. (2) Input offset
voltage specification includes effects of amplifier’s input bias and offset currents. (3) Common-mode voltage range is 11 (V–) to 11 [(V+) – 1] with a maximum of ±100V.
(4) Includes effects of input current noise and thermal noise contribution of resistor network.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
INA146
2
SPECIFICATIONS: VS = +5V Single Supply
At TA = +25°C, G = 1, RL = 10kΩ connected to VS /2 and Ref pin connected to VS /2 unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
INA146UA
PARAMETER
CONDITION
OFFSET VOLTAGE, VO
Input Offset Voltage
VOS
vs Temperature
∆VOS /∆T
vs Power Supply Rejection Ratio
PSRR
vs Time
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
Over Temperature
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
VCM
CMRR
MIN
VCM = VO = 0V
VS = ±1.35V to ±18V
VIN+ – VIN– = 0V, VO = 0V
VCM = –25V to +19V, RS = 0Ω
–25
70
64
IB
IOS
INPUT IMPEDANCE
Differential (non-inverting input)
Differential (inverting input)
Common-Mode
NOISE
Voltage Noise, f = 0.1Hz to 10Hz
Voltage Noise Density, f = 1kHz
MAX
UNITS
±3
See Typical Curve
±100
±3
±10
mV
±600
µV/ °C
µV/mo
19
80
74
V
dB
dB
±50
±5
nA
nA
110
91.7
55
kΩ
kΩ
kΩ
10
550
µVp-p
nV/√Hz
RTI(1, 3, 4)
en
GAIN
Gain Equation
Initial(1)
Gain Error
vs Temperature
G = 0.1 to 100
G = 0.1 • (1 + RG2 /RG1)
0.1
±0.025
±0.1
±1
±10
±0.025
±0.1
±1
±10
±0.001
±0.01
RL = 100kΩ, VO = 0.15V to 4V, G = 1
RL = 100kΩ, VO = 0.25V to 4V, G = 1
RL = 10kΩ, VO = 0.3V to 3.75V, G = 1
RL = 10kΩ, VO = 0.5V to 3.75V, G = 1
VO = +0.3 to +3.75, G = 1
vs Temperature
Nonlinearity
FREQUENCY RESPONSE
Small Signal Bandwidth
G = 0.1
G=1
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery
550
50
0.45
40
80
40
G = 1, 10V Step
G = 1, 10V Step
50% Input Overload
OUTPUT, VO
Voltage Output
Over Temperature
RL = 100kΩ, G = 1
RL = 100kΩ, G = 1
RL = 10kΩ, G = 1
RL = 10kΩ, G = 1
Continuous to Common
Stable Operation
Over Temperature
Short-Circuit Current
Capacitive Load
POWER SUPPLY
Voltage Range, Dual Supplies
Voltage Range, Single Supply
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
TYP
RTI(1, 2)
0.15
0.25
0.3
0.5
VIN = 0, IO = 0
±570
–40
–55
–55
θJA
kHz
kHz
V/µs
µs
µs
µs
4
4
3.75
3.75
V
V
V
V
mA
pF
±18
±36
±700
±750
V
V
µA
µA
+85
+125
+125
°C
°C
°C
°C/W
±15
1000
±2.25
±4.5
V/V
V/V
V/V
%
ppm / °C
%
ppm / °C
% of FS
150
NOTES: (1) Overall difference amplifier configuration. Referred to input pins (VIN+ and VIN–), gain = 0.1V/V. Specified with 10kΩ in feedback of A2. (2) Input offset
voltage specification includes effects of amplifier’s input bias and offset currents. (3) Includes effects of input current noise and thermal noise contribution of resistor
network. (4) Common-mode voltage range is 11 (V–) to 11 [(V+) – 1] with a maximum of ±100V.
®
3
INA146
AMPLIFIER A1, A2 PERFORMANCE
At TA = +25°C, G = 0.1, RL = 10kΩ connected to ground and Ref pin, unless otherwise noted.
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
INA146UA
PARAMETER
CONDITION
OFFSET VOLTAGE, VO
Input Offset Voltage
vs Temperature
MIN
TYP
MAX
UNITS
VOS
∆VOS /∆T
RTI(1, 2)
VS = ±15V, VCM = VO = 0V
TA = –40°C to +85°C
±0.5
±1
mV
µV/°C
VCM
CMRR
VIN+ – VIN– = 0V, VO = 0V
VCM = (V–) to (V+) –1
(V–) to (V+) –1
90
V
dB
AOL
110
dB
IB
IOS
±50
±5
nA
nA
10
±1
±100
kΩ
%
ppm/°C
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
OPEN-LOOP GAIN
Open Loop Gain
INPUT BIAS CURRENT(2)
Bias Current
Offset Current
RESISTOR AT A1 OUTPUT, VO1
Initial
Error
Temperature Drift Coefficient
ELECTROSTATIC
DISCHARGE SENSITIVITY
PIN CONFIGURATION
Top View
SO-8
Ref
1
8
VO1
–
VIN
2
7
V+
+
VIN
3
6
VO
V–
4
5
RG
This integrated circuit can be damaged by ESD. Burr-Brown
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)
Supply Voltage, V+ to V– .................................................................... 36V
Signal Input Terminals, Voltage ...................................................... ±100V
Current ....................................................... ±1mA
Output Short Circuit (to ground) .............................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –55°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +240°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
PACKAGE/ORDERING INFORMATION
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER(1)
INA146UA
"
SO-8
"
182
"
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(2)
TRANSPORT
MEDIA
–40°C to +85°C
"
INA146UA
"
INA146UA
INA146UA/2K5
Rails
Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book, or visit the Burr-Brown web site
at www.burr-brown.com. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel).
Ordering 2500 pieces of “INA146UA/2K5” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of
Burr-Brown IC Data Book.
®
INA146
4
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted.
GAIN vs FREQUENCY
GAIN vs FREQUENCY
40
40
VS = ±15V
CL = 1000pF
G = 10
20
G=1
Voltage Gain (dB)
Voltage Gain (dB)
20
0
–20
0
G=1
–20
G = 0.1
G = 0.1
–40
–40
100
1K
10K
100K
1M
100
10M
1K
10K
100K
1M
10M
Frequency (Hz)
Frequency (Hz)
POWER SUPPLY REJECTION vs FREQUENCY
COMMON-MODE REJECTION vs FREQUENCY
100
Power Supply Rejection (dB)
100
Common-Mode Rejection (dB)
VS = ±15V
CL = 200pF 10kΩ
G = 10
80
60
40
20
PSR+
(VS = ±15V)
80
PSR+
(VS = +5V)
60
40
20
PSR–
(VS = ±15V)
0
0
10
100
1k
10k
100k
1M
1
10M
10
100
1k
10k
Frequency (Hz)
Frequency (Hz)
INPUT VOLTAGE NOISE DENSITY
0.1Hz to 10Hz VOLTAGE NOISE (RTI)
100k
G = 0.1
2µV/div
Input Voltage Noise (nV/√Hz
10k
1k
G = 10
G=1
100
0.1
1
10
100
1k
10k
100k
500ms/div
Frequency (Hz)
®
5
INA146
TYPICAL PERFORMANCE CURVES
(Cont.)
At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted.
QUIESCENT CURRENT AND
SHORT-CIRCUIT CURRENT vs TEMPERATURE
SLEW RATE vs TEMPERATURE
IQ (µA)
ISC
0.6
18
0.55
630
16
610
14
590
12
10
570
IQ
550
8
G=1
0.5
Sew Rate (V/µs)
G=1
650
20
ISC (mA)
670
0.45
0.4
0.35
530
6
510
4
490
2
0.25
0
0.2
470
–60
–40 –20
20
0
40
60
80
0.3
100 120 140
–60
–40 –20
0
Temperature (°C)
40
60
80
100 120 140
SETTLING TIME vs LOAD CAPACITANCE
120
TS vs CLOAD
G
Φ
–90
RL = 10kΩ || 1nF
–135
0.01%, G = 1
VS = ±15V
100
RL = 10kΩ || 200pF
Settling Time (µs)
110
100
90
80
70
60
50
40
30
20
10
0
–10
Phase (°)
Open-Loop Gain (dB)
GAIN AND PHASE vs FREQUENCY
Op Amp A1 and A2
80
60
0.1%, G = 0.1
40
0.1%, G = 1
20
0
–180
1
10
100
1k
10k
100k
1
1M
3
MAXIMUM OUTPUT VOLTAGE SWING
vs OUTPUT CURRENT
30
100
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
15
25
+85°C
VS = ±2.25V
10
+125°C
Percent of Amplifiers (%)
–25°C
+25°C
5
+85°C
0
10
Load Capacitance (nF)
Frequency (Hz)
–55°C
+125°C
–5
+25°C
–25°C
+85°C
–10
20
Typical production
distribution of
packaged units.
15
10
5
–15
0
2
4
6
8
10
12
14
0
16
Output Current (mA)
< –10
< –9
< –8
< –7
< –6
< –5
< –4
< –3
< –2
< –1
<0
<1
<2
<3
<4
<5
<6
<7
<8
<9
< 10
> 10
Output Voltage Swing (V)
20
Temperature (°C)
Offset Voltage, RTI (mV)
®
INA146
6
TYPICAL PERFORMANCE CURVES
(Cont.)
At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted.
OFFSET VOLTAGE
PRODUCTION DISTRIBUTION
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
40
30
Typical production
distribution of
packaged units.
Typical production
distribution of
packaged units.
VS = ±15V
Percent of Amplifiers (%)
25
30
25
20
15
10
20
15
10
5
5
0
< –10
< –9
< –8
< –7
< –6
< –5
< –4
< –3
< –2
< –1
<0
<1
<2
<3
<4
<5
<6
<7
<8
<9
< 10
> 10
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
90
100
0
Offset Voltage Drift, RTI (µV/°C)
Offset Voltage, RTI (mV)
SMALL-SIGNAL STEP RESPONSE
(G = 0.1, RL = 10kΩ, CL = 200pF)
(G = 0.1, CL = 1000pF)
50mV/div
50mV/div
SMALL-SIGNAL STEP RESPONSE
5µs/div
5µs/div
SMALL-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
(G = 1, CL = 1000pF)
(G = 1, RL = 10kΩ, CL = 200pF)
5V/div
50mV/div
Percent of Amplifiers (%)
35
VS = ±15V
50µs/div
5µs/div
®
7
INA146
APPLICATION INFORMATION
SETTING THE GAIN
The gain of the INA146 is set by using two external
resistors, RG1 and RG2, according to the equation:
The INA146 is a programmable gain difference amplifier
consisting of a gain of 0.1 difference amplifier and a programmable-gain output buffer stage. Basic circuit connections are shown in Figure 1. Power supply bypass capacitors
should be connected close to pins 4 and 7 as shown. The
amplifier is programmable in the range of G = 0.1 to G = 50
with two external resistors.
G = 0.1 • (1 + RG2 / RG1)
For a total gain of 0.1, A2 is connected as a buffer amplifier
with no RG1. A feedback resistor, RG2 = 10kΩ, should be
used in the buffer connection. This provides bias current
cancellation (in combination with internal R5) to assure
specified offset voltage performance. Commonly used values are shown in the table of Figure 1. Resistor values for
other gains should be chosen to provide a 10kΩ parallel
resistance.
The output of A1 is connected to the noninverting input of
A2 through a 10kΩ resistor which is trimmed to ±1%
absolute accuracy. The A2 input is available for applications
such as a filter or a precision current source. See application
figures for examples.
COMMON-MODE RANGE
The 10:1 input resistor ratio of the INA146 provides an input
common-mode range that can extend well beyond the power
supply rails. Exact range depends on the power supply
voltage and the voltage applied to the Ref terminal (pin 1).
To assure proper operation, the voltage at the non-inverting
input of A1 (an internal node) must be within its linear
operating range. Its voltage is determined by the simple 10:1
voltage divider between pin 3 and pin 1. This voltage must
be between V– and (V+) – 1V.
OPERATING VOLTAGE
The INA146 is fully specified for supply voltages from
±2.25V to ±18V with key parameters guaranteed over the
temperature range –40°C to +85°C. The INA146 can be
operated with single or dual supplies with excellent performance. Parameters that vary significantly with operating
voltage, load conditions or temperature are shown in the
typical performance curves.
+VS
RG1
RG2
0.1µF
RB
7
5
R2
10kΩ
R1
100kΩ
VIN–
+
–
VO = (VIN – VIN) 0.1 (1 + RG2/RG1)
2
R5
10kΩ
A2
VO
6
A1
STANDARD 1% RESISTORS
R4
10kΩ
R3
100kΩ
+
VIN
3
INA146
4
1
8
0.1µF
V01
–VS
FIGURE 1. Basic Circuit Connections.
®
INA146
8
TOTAL GAIN
(V/V)
A2 GAIN
(V/V)
RG1
(Ω)
RG2
(Ω)
RB
(Ω)
0.1
0.2
0.5
1
2
5
10
20
50
100
1
2
5
10
20
50
100
200
500
1000
(None)
20k
12.4k
11.0k
10.5k
10.2k
10.2k
499
100
100
10k
20k
49.9k
100k
200k
499k
1M
100k
49.9k
100k
—
—
—
—
—
—
—
9.53k
10k
10k
OFFSET TRIM
The INA146 is laser-trimmed for low offset voltage and
drift. Most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the
offset voltage. A voltage applied to the Ref terminal will
be summed with the output signal. This can be used to null
offset voltage. To maintain good common-mode rejection,
the source impedance of a signal applied to the Ref
terminal should be less than 10Ω and a resistor added to
the positive input terminal should be 10 times that, or
100Ω. Alternatively, the trim voltage can be buffered with
an op amp such as the OPA277.
INPUT IMPEDANCE
The input impedance of the INA146 is determined by the
input resistor network and is approximately 100kΩ. The
source impedance at the two input terminals must be nearly
equal to maintain good common-mode rejection. A 12Ω
mismatch in impedance between the two inputs will cause
the typical common-mode rejection to be degraded to approximately 72dB. Figure 7 shows a common application
measuring power supply current through a shunt resistor.
The source impedance of the shunt resistor, RS, is balanced
by an equal compensation resistor, RC.
Source impedances greater than 800Ω are not recommended,
even if they are perfectly matched. Internal resistors are laser
trimmed for accurate ratios, not to absolute values. Adding
equal resistors greater than 800Ω can cause a mismatch in
the total resistor ratios, degrading CMR.
10kΩ
5
R1
R2
VIN–
R5
R3
100Ω
A2
VO
6
A1
VIN+
R4
1
Offset Adjustment Range = ±15mV, RTI
(±1.5mV at pin 1)
VO1
+15V
RT
100kΩ
100kΩ
10Ω
NOTE: Increasing the trim resistor
RT will decrease the trim range
–15V
FIGURE 2. Optional Offset Trim Circuit.
RG2
10kΩ
V+
+5V
RX
5
7
2
Output scaled to low
voltage A/D converter.
10.8V
+
10kΩ
VO = 1.08V nominal
VIN
Load
6
3
RX
INA146
Differential measurement at
battery rejects voltage drop
in connection resistance, RX.
4
1
8
V+
Max VIN
+5V
+7V
+10V
≥ 11V
40V
60V
95V
100V
FIGURE 3. Measuring Voltages Greater than Supply Voltage.
®
9
INA146
Pole at
106Hz
G=1
1500pF
RG2
10kΩ
RG2
1MΩ
RG1
10kΩ
5
–
VIN
2
5
–
VIN
2
10kΩ
6
10kΩ
VO
6
+
VIN
3
INA146
1
+
VIN
8
1N4684 (3.3V)
3
Output clamps at
approximately ±4V.
INA146
1
1N914
8
22nF
Pole at
720Hz
FIGURE 5. Output Clamp.
FIGURE 4. Noise Filtering.
RG2
10kΩ
5
–
VIN
2
R1
R2
0V ≤ VO ≤ 5V
10kΩ
6
+
VIN
3
R3
R4
INA146
8
1
1N914
Voltage
Reference
(1)
5.0V
or analog-to-digital VS
1N914
(1)
NOTE: (1) 1/2 OPA2342 with VS connected to +5V and GND.
FIGURE 6. Precision Clamp.
®
INA146
10
VO
VO
RG2
100kΩ
RG1
11kΩ
Power
Supply
5
For sense resistors (RS)
greater than 10Ω, use
series compensation
resistor (RC) for good
common-mode rejection.
Sense resistors greater
than 500Ω are not
recommended.
2
RC
100Ω
VO
6
RS
100Ω
3
INA146
1
8
Load
VO1
FIGURE 7. Current Monitor, G = 1.
+5V
24V
8.4kΩ
Feedback
7
5
2
8kΩ
1V
6
SHUNT
R-I Lamp/10
e.g., 0.1Ω for 1A
VO
10kΩ
1V – 50mV
3
2kΩ
INA146
4
1
8
Ref
10MΩ
Lamp
FIGURE 8. Comparator Output with Optional Hysteresis Application to Sense Lamp Burn-Out.
RG2
100kΩ
RG1
11kΩ
RG2
10kΩ
5
–
VIN
5
2
VIN
2
VO
10kΩ
6
+
VIN
3
INA146
1
R1
1MΩ
+
C1
0.1µF
VIN
3
INA146
1
Pole at
1
f=
= 1.6Hz
2πR1RC
VO
VO1
8
+
–
IOUT – (VIN
– VIN
)/10kΩ
OPA277
FIGURE 9. AC Coupling (DC Restoration).
FIGURE 10. Precision Current Source.
®
11
INA146
PACKAGE OPTION ADDENDUM
www.ti.com
16-Feb-2009
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
INA146UA
ACTIVE
SOIC
D
8
INA146UA/2K5
ACTIVE
SOIC
D
INA146UA/2K5E4
ACTIVE
SOIC
INA146UAE4
ACTIVE
SN0406068DR
ACTIVE
75
Lead/Ball Finish
MSL Peak Temp (3)
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
SOIC
D
8
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
75
(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)
(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.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Mar-2008
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
INA146UA/2K5
Package Package Pins
Type Drawing
SOIC
D
8
SPQ
Reel
Reel
Diameter Width
(mm) W1 (mm)
2500
330.0
12.4
Pack Materials-Page 1
A0 (mm)
B0 (mm)
K0 (mm)
P1
(mm)
6.4
5.2
2.1
8.0
W
Pin1
(mm) Quadrant
12.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Mar-2008
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
INA146UA/2K5
SOIC
D
8
2500
346.0
346.0
29.0
Pack Materials-Page 2
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