INA332 [TI]
低功耗、单电源、CMOS、低成本仪表放大器;型号: | INA332 |
厂家: | TEXAS INSTRUMENTS |
描述: | 低功耗、单电源、CMOS、低成本仪表放大器 放大器 仪表 仪表放大器 |
文件: | 总22页 (文件大小:578K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
INA332
I
N
A
3
3
2
®
INA2332
INA2332
SBOS216B – SEPTEMBER 2001 - REVISED OCTOBER 2006
Low-Power, Single-Supply, CMOS
INSTRUMENTATION AMPLIFIERS
APPLICATIONS
FEATURES
● INDUSTRIAL SENSOR AMPLIFIERS:
● DESIGNED FOR LOW COST
Bridge, RTD, Thermocouple, Position
● HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/°C
● GAIN SET WITH EXT. RESISTORS FOR > 5V/V
● HIGH CMRR: 73dB DC, 50dB at 45kHz
● LOW BIAS CURRENT: 0.5pA
● PHYSIOLOGICAL AMPLIFIERS: ECG, EEG, EMG
● A/D CONVERTER SIGNAL CONDITIONING
● DIFFERENTIAL LINE RECEIVERS WITH GAIN
● FIELD UTILITY METERS
● BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs
● RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V
● WIDE TEMPERATURE RANGE: –55°C to +125°C
● LOW QUIESCENT CURRENT: 490µA max/chan
● SHUTDOWN: 0.01µA
● PCMCIA CARDS
● AUDIO AMPLIFIERS
● COMMUNICATION SYSTEMS
● TEST EQUIPMENT
● AUTOMOTIVE INSTRUMENTATION
● MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES
DESCRIPTION
The INA332 and INA2332 are rail-to-rail output, low-power
CMOS instrumentation amplifiers that offer wide range, single-
supply, and bipolar-supply operation. Using a special manu-
facturing flow, the INA332 family provides the lowest cost
available, while still achieving low-noise amplification of dif-
ferential signals with low quiescent current of 415µA (drop-
ping to 0.01µA when shut down). Returning to normal opera-
tion within microseconds, this INA can be used for battery or
multichannel applications.
The INA332 rejects line noise and its harmonics because
common-mode error remains low even at higher frequencies.
High bandwidth and slew rate make the INA332 ideal for
directly driving sampling Analog-to-Digital (A/D) converters
as well as general-purpose applications.
With high precision, low cost, and small packages, the
INA332 outperforms discrete designs.
Additionally, because they are specified for a wide tempera-
ture range of –55°C to +125°C, the INA332 family can be
used in demanding environments.
Configured internally in a gain of 5V/V, the INA332 offers
flexibility in higher gains by choosing external resistors.
R1
R2
RG
G = 5 + 5(R2/R1)
INA2332
INA332
40kΩ
10kΩ
VREF
40kΩ
Ch A
10kΩ
VOUT
A1
A3
A2
VIN–
Ch B
VIN+
V+
V–
Shutdown
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.
Copyright © 2001-2006, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V– .................................................................... 7.5V
Signal Input Terminals, Voltage(2) ..................... (V–) – 0.5V to (V+) + 0.5V
Current(2) ..................................................... 10mA
ELECTROSTATIC
DISCHARGE SENSITIVITY
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ...................................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
devicereliability.(2)Inputterminalsarediode-clampedtothepower-supplyrails.
Input signals that can swing more than 0.5V beyond the supply rails should be
current limited to 10mA or less. (3) Short-circuit to ground, one amplifier per
package.
ESD damage can range from subtle performance degradation
tocompletedevicefailure. Precisionintegratedcircuitsmaybe
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION(1)
SPECIFIED
PACKAGE
DESIGNATOR
TEMPERATURE
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
PACKAGE-LEAD
RANGE
Single
INA332AIDGK
MSOP-8
DGK
–55°C to +125°C
B32
INA332AIDGKT
INA332AIDGKR
Tape and Reel, 250
Tape and Reel, 2500
"
"
"
"
"
Dual
INA2332AIPW
TSSOP-14
PW
–55°C to +125°C
2332A
INA2332AIPWT
INA2332AIPWR
Tape and Reel, 250
Tape and Reel, 2500
"
"
"
"
"
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI web site at
www.ti.com.
PIN CONFIGURATION
Top View
INA2332
RGA
1
2
3
4
5
6
7
14 Shutdown A
13 OUTA
INA332
VIN–A
V
RG
1
2
3
4
8
7
6
5
Shutdown
V+
VIN+A
12 REFA
11 V+
VIN–
V–
VIN+
VOUT
V
IN+B
IN–B
10 REFB
V–
REF
V
9
8
V
OUTB
MSOP-8 (DGK)
RGB
Shutdown B
Dual, TSSOP-14 (PW)
INA332, INA2332
2
SBOS216B
www.ti.com
ELECTRICAL CHARACTERISTICS: VS = +2.7V TO +5.5V
BOLDFACE limits apply over the specified temperature range, TA = –55°C TO +125°C
At TA = +25°C, RL = 10kΩ, G = 25, and VCM = VS /2, unless otherwise noted.
INA332AIDGK
INA2332AIPW
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
INPUT
Input Offset Voltage, RTI
Over Temperature
Temperature Coefficient
vs Power Supply
Over Temperature
Long-Term Stability
Input Impedance
VS = +5V
±2
±8
±9
mV
mV
VOS
dVOS/dT
PSRR
±5
±50
µV/°C
µV/V
µV/V
µV/month
Ω || pF
V
VS = +2.7V to +5.5V
±250
±260
±0.4
1013 || 3
Input Common-Mode Range
VS = 2.7V
VS = 5V
VS = 5V, VCM = 0.55V to 3.8V
VS = 5V, VCM = 0.55V to 3.8V
VS = 2.7V, VCM = 0.35V to 1.5V
0.35
0.55
60
1.5
3.8
V
dB
dB
dB
Common-Mode Rejection
Over Temperature
CMRR
73
60
73
Crosstalk, Dual
114
dB
INPUT BIAS CURRENT
Bias Current
Offset Current
VCM = VS/2
IB
IOS
±0.5
±0.5
±10
±10
pA
pA
NOISE, RTI
RS = 0Ω
Voltage Noise: f = 10Hz
f = 100Hz
f = 1kHz
f = 0.1Hz to 10Hz
Current Noise: f = 1kHz
eN
280
96
46
7
nV/√Hz
nV/√Hz
nV/√Hz
µVp-p
iN
0.5
fA/√Hz
GAIN(1)
Gain Equation, Externally Set
Range of Gain
Gain Error
vs Temperature
Nonlinearity
G > 5
G = 5 + 5(R2/R1)
5
1000
±0.4
±10
±0.010
±0.015
V/V
%
ppm/°C
% of FS
% of FS
±0.07
±2
±0.001
G = 5
G = 25, VS = 5V, VO = 0.05 to 4.95
Over Temperature
±0.002
OUTPUT
Output Voltage Swing from Rail(2)
G ≥ 10
50
25
mV
Over Temperature
Capacitance Load Drive
Short-Circuit Current
50
mV
pF
mA
See Typical Characteristics(3)
ISC
+48/–32
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.1%
0.01%
BW
SR
tS
G = 25
VS = 5V, G = 25
G = 25, CL = 100pF, VO = 2V step
2.0
5
1.7
2.5
2
MHz
V/µs
µs
µs
µs
Overload Recovery
50% Input Overload G = 25
POWER SUPPLY
Specified Voltage Range
Operating Voltage Range
Quiescent Current per Channel
Over Temperature
+2.7
+5.5
V
V
µA
µA
µA
+2.5 to +5.5
415
IQ
VSD > 2.5(4)
VSD < 0.8(4)
490
600
1
Shutdown Quiescent Current/Chan ISD
0.01
TEMPERATURE RANGE
Specified/Operating Range
Storage Range
–55
–65
+125
+150
°C
°C
Thermal Resistance
θJA
MSOP-8, TSSOP-14 Surface Mount
150
°C/W
NOTES: (1) Does not include errors from external gain setting resistors.
(2) Output voltage swings are measured between the output and power-supply rails. Output swings to rail only if G ≥ 10. Output does not swing to
positive rail if gain is less than 10.
(3) See typical characteristic curve, Percent Overshoot vs Load Capacitance.
(4) See typical characteristic curve, Shutdown Voltage vs Supply Voltage.
INA332, INA2332
3
SBOS216B
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
COMMON-MODE REJECTION RATIO
vs FREQUENCY
GAIN vs FREQUENCY
80
70
60
50
40
30
20
10
0
120
100
80
60
40
20
0
Gain = 500
Gain = 100
Gain = 25
Gain = 5
–10
–20
10
100
1k
10k
100k
1M
10M
10
100k
100
1k
10k
Frequency (Hz)
Frequency (Hz)
POWER-SUPPLY REJECTION RATIO
vs FREQUENCY
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
VS = 5.5V
100
90
80
70
60
50
40
30
20
10
0
6
5
4
3
2
1
0
VS = 5.0V
VS = 2.7V
1
10
100
1k
10k
100k
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
0.1Hz TO 10Hz VOLTAGE NOISE
NOISE vs FREQUENCY
10k
1k
100
10
1
100
10
0.1
1s/div
1
10
100
1k
10k
100k
Frequency (Hz)
INA332, INA2332
4
SBOS216B
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
COMMON-MODE INPUT RANGE
vs REFERENCE VOLTAGE
OUTPUT SWING vs LOAD RESISTANCE
25
6
5
4
3
2
1
0
20
Outside of Normal Operation
15
To Positive Rail
REF
Increasing
10
To Negative Rail
5
0
0
1
2
3
4
5
0
10k
20k
30k
40k
50k
5.5
5.5
Input Common-Mode Voltage (V)
RLOAD (Ω)
QUIESCENT CURRENT AND SHUTDOWN CURRENT
vs POWER SUPPLY
QUIESCENT CURRENT AND SHUTDOWN CURRENT
vs TEMPERATURE
500
450
400
350
300
250
200
150
100
50
600
550
500
450
400
350
300
250
200
150
100
50
IQ
IQ
ISD
ISD
0
0
2.5
3
3.5
4
4.5
5
–75 –50 –25
0
25
50
75
100 125 150
Supply Voltage (V)
Temperature (°C)
SHORT-CIRCUIT CURRENT vs POWER SUPPLY
ISC+
SHORT-CIRCUIT CURRENT vs TEMPERATURE
ISC+
60
50
40
30
20
10
0
60
50
40
30
20
10
0
ISC–
ISC–
2.5
3
3.5
4
4.5
5
–75 –50 –25
0
25
50
75 100 125 150
Supply Voltage (V)
Temperature (°C)
INA332, INA2332
5
SBOS216B
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE (G = 5)
SMALL-SIGNAL STEP RESPONSE (G = 100)
4µs/div
4µs/div
SMALL-SIGNAL STEP RESPONSE
(G = 5, CL = 1000pF)
SMALL-SIGNAL STEP RESPONSE
(G = 100, CL = 1000pF)
4µs/div
10µs/div
SMALL-SIGNAL STEP RESPONSE
(G = 100, CL = 4700pF)
LARGE-SIGNAL STEP RESPONSE (G = 25)
10µs/div
10µs/div
INA332, INA2332
6
SBOS216B
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
SETTLING TIME vs GAIN
PERCENT OVERSHOOT vs LOAD CAPACITANCE
60
50
40
30
20
10
0
100
Output 100mVp-p
Differential Drive
Output 2Vp-p
Differential
Input Drive
90
80
70
60
50
40
30
20
10
0
G = 5
0.01%
G = 25
0.1%
1
10
100
1k
10
100
1k
10k
Gain (V/V)
Load Capacitance (pF)
SHUTDOWN VOLTAGE vs SUPPLY VOLTAGE
Operation in this Region
SHUTDOWN TRANSIENT BEHAVIOR
3
2.5
2
VSD
is not Recommended
Normal Operation Mode
1.5
1
Shutdown Mode
VOUT
0.5
0
Part Draws Below 1µA Quiescent Current
2.5
3
3.5
4
4.5
5
5.5
50µs/div
Supply Voltage (V)
OFFSET VOLTAGE DRIFT
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
PRODUCTION DISTRIBUTION
25
20
15
10
5
20
18
16
14
12
10
8
6
4
2
0
0
Offset Voltage (mV)
Offset Voltage (µV/°C)
INA332, INA2332
7
SBOS216B
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
SLEW RATE vs TEMPERATURE
INPUT BIAS CURRENT vs TEMPERATURE
8
7
6
5
4
3
2
1
0
10000
1000
100
10
1
0.1
–75 –50 –25
0
25
50
75 100 125 150
–75 –50 –25
0
25
50
75 100 125 150
Temperature (°C)
Temperature (°C)
CHANNEL SEPARATION vs FREQUENCY
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
120
100
80
60
40
20
0
5
4
3
2
1
0
125°C
25°C
–55°C
1
10
100
1k
10k
100k
1M
10M
0
5
10 15 20 25 30 35 40 45 50 55 60
Output Current (mA)
Frequency (Hz)
INA332, INA2332
8
SBOS216B
www.ti.com
OPERATING VOLTAGE
APPLICATIONS INFORMATION
The INA332 is a modified version of the classic two op amp
The INA332 family is fully specified over a supply range of
+2.7V to +5.5V, with key parameters tested over the tempera-
ture range of –55°C to +125°C. Parameters that vary signifi-
cantly with operating conditions, such as load conditions or
temperature, are shown in the Typical Characteristics.
instrumentation amplifier, with an additional gain amplifier.
Figure 1 shows the basic connections for the operation of the
INA332 and INA2332. The power supply should be capaci-
tively decoupled with 0.1µF capacitors as close to the INA332
as possible for noisy or high-impedance applications.
The INA332 may be operated on a single supply. Figure 2
shows a bridge amplifier circuit operated from a single +5V
supply. The bridge provides a small differential voltage riding
on an input common-mode voltage.
The output is referred to the reference terminal, which must
be at least 1.2V below the positive supply rail.
G = 5 + 5 (R2 / R1 )
DESIRED GAIN
Short VOUT to RG
(V/V)
R1
R2
R1
R2
for G = 5
5
OPEN SHORT
10
100kΩ 100kΩ
RG
1
50
10kΩ
90kΩ
100
10kΩ 190kΩ
40kΩ
10kΩ
5
REF
40kΩ
10kΩ
A1
6
VO = ((VIN+) – (VIN –)) • G
A3
2
3
VIN
–
A2
VIN+
Also drawn in simplified form:
8
7
4
V+
Shutdown
7
3
5
2
VIN
REF
VIN
+
(For Single
Supply)
Shutdown
0.1µF
0.1µF
8
1
6
VOUT
INA332
V+
V–
–
4
V–
RG
FIGURE 1. Basic Connections.
+5V
V+
Shutdown
VIN+
7
Bridge
Sensor
3
8
6
REF(1)
VIN
5
2
VOUT
INA332
1
–
4
NOTE: (1) REF should be adjusted for the desired output level,
keeping in mind that the value of REF affects the common-mode
input range. See Typical Characteristics.
V–
RG
FIGURE 2. Single-Supply Bridge Amplifier.
INA332, INA2332
9
SBOS216B
www.ti.com
SETTING THE GAIN
For proper operation, a path must be provided for input bias
currents for both inputs. Without input bias current paths, the
inputs will float to a potential that exceeds common-mode
range and the input amplifier will saturate. Figure 3 shows
how bias current path can be provided in the cases of
microphone applications, thermistor applications, ground re-
turns, and dc-coupled resistive bridge applications.
The ratio of R2 to R1, or the impedance between pins 1, 5,
and 6, determines the gain of the INA332. With an internally
set gain of 5, the INA332 can be programmed for gains
greater than 5 according to the following equation:
G = 5 + 5 (R2/R1)
V+
The INA332 is designed to provide accurate gain, with gain
error less than 0.4%. Setting gain with matching TC resistors
will minimize gain drift. Errors from external resistors will add
directly to the error, and may become dominant error sources.
Shutdown
VIN
+
7
3
5
2
8
1
Microphone,
Hydrophone,
etc.
6
VOUT
INA332
REF
VIN
–
4
COMMON-MODE INPUT RANGE
47kΩ
VB
V–
RG
The upper limit of the common-mode input range is set by the
common-mode input range of the second amplifier, A2, to
1.2V below positive supply. Under most conditions, the
amplifier operates beyond this point with reduced perfor-
mance. The lower limit of the input range is bounded by the
output swing of amplifier A1, and is a function of the refer-
ence voltage according to the following equation:
(1)
V+
Shutdown
VIN+
7
3
5
2
8
6
VOA1 = 5/4 VCM – 1/4 VREF
VOUT
Transformer
INA332
REF
VIN
1
–
4
(See typical characteristic curve, Common-Mode Input Range
vs Reference Voltage).
Center-tap
provides bias
current return
(1)
VB
V– RG
REFERENCE
The reference terminal defines the zero output voltage level.
In setting the reference voltage, the common-mode input of
A3 should be considered according to the following equation:
VEX
Bridge
Amplifier
V+
Shutdown
VIN
+
7
INA332
4
3
5
2
Bridge
Sensor
VOA2 = VREF + 5 (VIN+ – VIN–)
8
1
6
VOUT
REF
VIN
–
For ensured operation, VOA2 should be less than VDD – 1.2V.
The reference pin requires a low-impedance connection. As
little as 160Ω in series with the reference pin will degrade the
CMRR to 50dB. The reference pin may be used to compen-
sate for the offset voltage (see the Offset Trimming section).
The reference voltage level also influences the common-
mode input range (see the Common-Mode Input Range
section).
Bridge resistance
provides bias
current return
V– RG
NOTE: (1) VB is bias voltage within
common-mode range, dependent
on REF.
FIGURE 3. Providing an Input Common-Mode Path.
INPUT BIAS CURRENT RETURN
When differential source impedance is low, the bias current
return path can be connected to one input. With higher
source impedance, two equal resistors will provide a bal-
anced input. The advantages are lower input offset voltage
due to bias current flowing through the source impedance
and better high-frequency gain.
With a high input impedance of 1013Ω, the INA332 is ideal for
use with high-impedance sources. The input bias current of
less than 10pA makes the INA332 nearly independent of
input impedance and ideal for low-power applications.
INA332, INA2332
10
SBOS216B
www.ti.com
SHUTDOWN MODE
+5V
The shutdown pin of the INA332 is nominally connected to V+.
When the pin is pulled below 0.8V on a 5V supply, the INA332
goes into sleep mode within nanoseconds. For actual shut-
down threshold, see typical characteristic curve, Shutdown
Voltage vs Supply Voltage. Drawing less than 2µA of current,
and returning from sleep mode in microseconds, the shutdown
feature is useful for portable applications. Once in sleep mode,
the amplifier has high output impedance, making the INA332
suitable for multiplexing.
0.1µF
V+
7
0.1µF
Shutdown
3
5
2
VIN
REF
VIN
+
8
VOUT
6
INA332
1
VOUT
OPA340
–
4
V–
RG
RAIL-TO-RAIL OUTPUT
FIGURE 5. Output Buffering Circuit. Able to drive loads as
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output for gains of 10 or greater.
For resistive loads greater than 10kΩ, the output voltage can
swing to within 25mV of the supply rail while maintaining low
gain error. For heavier loads and over temperature, see the
typical characteristic curve, Output Voltage Swing vs Output
Current. The INA332’s low output impedance at high frequen-
cies makes it suitable for directly driving Capacitive-Input
A/D converters, as shown in Figure 4.
low as 600Ω.
V+
Shutdown
7
3
VIN+
8
1
REF(1)
6
5
2
VOUT
INA332
VIN–
4
V–
RG
+5V
V+
Shutdown
OPA336
7
3
5
2
VIN
REF
VIN
+
Adjustable
Voltage
12-Bits
8
1
VOUT
ADS7818
or
ADS7822
6
INA332
NOTE: (1) REF should be adjusted for the desired output level.
The value of REF affects the common-mode input range.
–
4
V–
RG
FIGURE 6. Optional Offset Trimming Voltage.
fS < 100kHz
INPUT PROTECTION
FIGURE 4. INA332 Directly Drives Capacitive-Input, High-
Speed A/D Converter.
Device inputs are protected by ESD diodes that will conduct
if the input voltages exceed the power supplies by more than
500mV. Momentary voltages greater than 500mV beyond
the power supply can be tolerated if the current through the
input pins is limited to 10mA. This is easily accomplished with
input resistor RLIM, as shown in Figure 7. Many input signals
are inherently current-limited to less than 10mA; therefore, a
limiting resistor is not required.
OUTPUT BUFFERING
The INA332 is optimized for a load impedance of 10kΩ or
greater. For higher output current the INA332 can be buff-
ered using the OPA340, as shown in Figure 5. The OPA340
can swing within 50mV of the supply rail, driving a 600Ω load.
The OPA340 is available in the tiny MSOP-8 package.
OFFSET TRIMMING
V+
Shutdown
RLIM
The INA332 is laser trimmed for low offset voltage. In the
event that external offset adjustment is required, the offset
can be adjusted by applying a correction voltage to the
reference terminal. Figure 6 shows an optional circuit for
trimming offset voltage. The voltage applied to the REF
terminal is added to the output signal. The gain from REF to
VOUT is +1. An op amp buffer is used to provide low
impedance at the REF terminal to preserve good common-
mode rejection.
7
3
5
2
VIN+
8
1
IOVERLOAD
10mA max
6
VOUT
REF
INA332
VIN–
4
RLIM
V–
RG
FIGURE 7. Sample Output Buffering Circuit.
INA332, INA2332
11
SBOS216B
www.ti.com
OFFSET VOLTAGE ERROR CALCULATION
FEEDBACK CAPACITOR IMPROVES RESPONSE
The offset voltage (VOS) of the INA332AIDGK is specified at
a maximum of 500µV with a +5V power supply and the
common-mode voltage at VS/2. Additional specifications for
power-supply rejection and common-mode rejection are pro-
vided to allow the user to easily calculate worst-case ex-
pected offset under the conditions of a given application.
For optimum settling time and stability with high-impedance
feedback networks, it may be necessary to add a feedback
capacitor across the feedback resistor, RF, as shown in
Figure 8. This capacitor compensates for the zero created by
the feedback network impedance and the INA332’s RG-pin
input capacitance (and any parasitic layout capacitance).
The effect becomes more significant with higher impedance
networks. Also, RX and CL can be added to reduce high-
frequency noise.
Power-Supply Rejection Ratio (PSRR) is specified in µV/V.
For the INA332, worst case PSRR is 200µV/V, which means
for each volt of change in power supply, the offset may shift
up to 200µV. Common-Mode Rejection Ratio (CMRR) is
specified in dB, which can be converted to µV/V using the
following equation:
V+
Shutdown
7
3
VIN+
CMRR (in µV/V) = 10[(CMRR in dB)/–20] • 106
8
INA332
RX
6
5
2
VOUT
REF
CIN
For the INA332, the worst case CMRR over the specified
common-mode range is 60dB (at G = 25) or about 30µV/V
This means that for every volt of change in common-mode,
the offset will shift less than 30µV.
CL
1
VIN–
RG
4
V–
These numbers can be used to calculate excursions from the
specified offset voltage under different application condi-
tions. For example, an application might configure the ampli-
fier with a 3.3V supply with 1V common-mode. This configu-
ration varies from the specified configuration, representing a
1.7V variation in power supply (5V in the offset specification
versus 3.3V in the application) and a 0.65V variation in
common-mode voltage from the specified VS/2.
RIN
RF
RIN • CIN = RF • CF
CF
Where CIN is equal to the INA332’s input capacitance
(approximately 3pF) plus any parastic layout capacitance.
FIGURE 8. Feedback Capacitor Improves Dynamic Perfor-
mance.
Calculation of the worst-case expected offset would be as
follows:
It is suggested that a variable capacitor be used for the
feedback capacitor since input capacitance may vary be-
tween instrumentation amplifiers, and layout capacitance is
difficult to determine. For the circuit shown in Figure 8, the
value of the variable feedback capacitor should be chosen by
the following equation:
Adjusted VOS = Maximum specified VOS
+
(power-supply variation) • PSRR +
(common-mode variation) • CMRR
VOS = 0.5mV + (1.7V • 200µV) + (0.65V • 30µV)
= ±0.860mV
RIN • CIN = RF • CF
However, the typical value will be smaller, as seen in the
Typical Characteristics.
Where CIN is equal to the INA332’s RG-pin input capacitance
(typically 3pF) plus the layout capacitance. The capacitor can
be varied until optimum performance is obtained.
INA332, INA2332
12
SBOS216B
www.ti.com
Filtering can be modified to suit application needs by chang-
ing the capacitor value of the output filter.
APPLICATION CIRCUITS
MEDICAL ECG APPLICATIONS
Figure 9 shows the INA332 configured to serve as a low-cost
ECG amplifier, suitable for moderate accuracy heart-rate
applications such as fitness equipment. The input signals are
obtained from the left and right arms of the patient. The
common-mode voltage is set by two 2MΩ resistors. This
potential through a buffer provides optional right leg drive.
LOW-POWER, SINGLE-SUPPLY DATA
ACQUISITION SYSTEMS
Refer to Figure 4 to see the INA332 configured to drive an
ADS7818. Functioning at frequencies of up to 500kHz, the
INA332 is ideal for low-power data acquisition.
VR
OPA336
1.6nF
0.1µF
V+
1MΩ
Shutdown
1MΩ
100kΩ
100kΩ
VIN
REF
VIN
+
7
3
Left Arm
8
1
10kΩ
6
5
2
INA332
VOUT PUT
–
OPA336
10kΩ
Right Arm
4
VR
+5V
V–
RG
1MΩ
2MΩ
2MΩ
2kΩ
VR = +2.5V
Right
Leg
OPA336
2kΩ
FIGURE 9. Simplified ECG Circuit for Medical Applications.
INA332, INA2332
13
SBOS216B
www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
25-Apr-2022
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
INA2332AIPWR
INA2332AIPWT
INA2332AIPWTG4
ACTIVE
TSSOP
TSSOP
TSSOP
PW
14
14
14
2500 RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
-55 to 125
-55 to 125
-55 to 125
INA
2332A
ACTIVE
ACTIVE
PW
250
250
RoHS & Green
RoHS & Green
NIPDAU
NIPDAU
INA
2332A
PW
INA
2332A
INA332AIDGKR
INA332AIDGKRG4
INA332AIDGKT
ACTIVE
ACTIVE
ACTIVE
ACTIVE
VSSOP
VSSOP
VSSOP
VSSOP
DGK
DGK
DGK
DGK
8
8
8
8
2500 RoHS & Green Call TI | NIPDAUAG
2500 RoHS & Green Call TI
RoHS & Green Call TI | NIPDAUAG
RoHS & Green Call TI
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
-55 to 125
-55 to 125
-55 to 125
-55 to 125
B32
B32
B32
B32
250
250
INA332AIDGKTG4
(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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
25-Apr-2022
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
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
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
K0
P1
W
B0
Reel
Diameter
Cavity
A0
A0 Dimension designed to accommodate the component width
B0 Dimension designed to accommodate the component length
K0 Dimension designed to accommodate the component thickness
Overall width of the carrier tape
W
P1 Pitch between successive cavity centers
Reel Width (W1)
QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE
Sprocket Holes
Q1 Q2
Q3 Q4
Q1 Q2
Q3 Q4
User Direction of Feed
Pocket Quadrants
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
INA2332AIPWR
INA2332AIPWT
TSSOP
TSSOP
PW
PW
14
14
2500
250
330.0
180.0
12.4
12.4
6.9
6.9
5.6
5.6
1.6
1.6
8.0
8.0
12.0
12.0
Q1
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL BOX DIMENSIONS
Width (mm)
H
W
L
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
INA2332AIPWR
INA2332AIPWT
TSSOP
TSSOP
PW
PW
14
14
2500
250
367.0
210.0
367.0
185.0
35.0
35.0
Pack Materials-Page 2
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