INA2322EA [TI]
INSTRUMENTATION AMPLIFIER;型号: | INA2322EA |
厂家: | TEXAS INSTRUMENTS |
描述: | INSTRUMENTATION AMPLIFIER 放大器 光电二极管 |
文件: | 总21页 (文件大小:767K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
INA322
®
INA322
INA2322
SBOS174B – DECEMBER 2000 – REVISED FEBRUARY 2006
microPower, Single-Supply, CMOS
INSTRUMENTATION AMPLIFIER
FEATURES
ꢀ LOW COST
APPLICATIONS
ꢀꢀINDUSTRIAL SENSOR AMPLIFIERS:
Bridge, RTD, Thermistor, Position
ꢀ PHYSIOLOGICAL AMPLIFIERS:
ECG, EEG, EMG
ꢀ A/D CONVERTER SIGNAL CONDITIONING
ꢀ DIFFERENTIAL LINE RECEIVERS WITH GAIN
ꢀ FIELD UTILITY METERS
ꢀ PCMCIA CARDS
ꢀ COMMUNICATION SYSTEMS
ꢀ TEST EQUIPMENT
ꢀ LOW QUIESCENT CURRENT: 40µA/channel
Shut Down: < 1µA
ꢀ HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/°C
ꢀ GAIN SET WITH EXTERNAL RESISTORS
ꢀ LOW BIAS CURRENT: 10pA
ꢀ BANDWIDTH: 500kHz, G = 5V/V
ꢀ RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V
ꢀ WIDE TEMPERATURE RANGE:
–55°C to +125°C
ꢀ SINGLE VERSION IN MSOP-8 PACKAGE AND
DUAL VERSION IN TSSOP-14 PACKAGE
ꢀ AUTOMOTIVE INSTRUMENTATION
Configured internally for 5V/V gain, the INA322 offers excep-
tional flexibility with user-programmable external gain resis-
tors. The INA322 reduces common-mode error over fre-
quency and with CMRR remaining high up to 3kHz, line noise
and line harmonics are rejected.
DESCRIPTION
The INA322 family is a series of low cost, rail-to-rail output,
micropower CMOS instrumentation amplifiers that offer wide-
range, single-supply, as well as bipolar-supply operation.
The INA322 family provides low-cost, low-noise amplification
of differential signals with micropower current consumption of
40µA. When shutdown the INA322 has a quiescent current
of less than 1µA. Returning to normal operations within
microseconds, the shutdown feature makes the INA322
optimal for low-power battery or multiplexing applications.
The low-power design does not compromise on bandwidth or
slew rate, making the INA322 ideal for driving sampling Ana-
log-to-Digital (A/D) converters as well as general-purpose
applications. With high precision, low cost, and small packag-
ing, the INA322 outperforms discrete designs, while offering
reliability and performance.
R1
R2
RG
160kΩ
40kΩ
40kΩ
160kΩ
REF
A1
VOUT
A3
VIN–
VIN+
A2
Gain = 5 + 5(R2/R1)
VOUT = (VIN+ – VIN–) • Gain
Shutdown
V+
V–
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000-2006, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
Supply Voltage, V+ to V–................................................................... 7.5V
Signal Input Terminals, Voltage(2) .................. (V–) – 0.5V to (V+) + 0.5V
Current(2) .................................................... 10mA
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature ..................................................–65°C to +150°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.
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) Input terminals are diode-clamped to the power-supply rails. Input signals
that can swing more than 0.5V beyond the supply rails should be current limited
to 10mA or less. (3) Short-circuit to ground, one amplifier per package.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE/ORDERING INFORMATION(1)
PACKAGE
DESIGNATOR
PACKAGE
MARKING
PRODUCT
PACKAGE-LEAD
MSOP-8
SINGLE
INA322EA
DGK
PW
C22
DUAL
INA2322EA
TSSOP-14
INA2322EA
NOTES: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
PIN CONFIGURATIONS
Top View
INA2322
INA322
RGA
1
2
3
4
5
6
7
14 Shutdown A
13 OUTA
V
IN–A
IN+A
V–
V
RG
1
2
3
4
8
7
6
5
Shutdown
V+
V
12 REFA
11 V+
VIN–
VIN+
VOUT
V
IN+B
IN–B
10 REFB
V–
REF
V
9
8
V
OUTB
MSOP-8 (EA)
RGB
Shutdown B
Dual, TSSOP-14 (EA)
2
INA322
SBOS174B
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 = 25kΩ, G = 25, and IA common = VS /2, unless otherwise noted.
INA322EA
INA2322EA
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
INPUT
Input Offset Voltage, RTI
Over Temperature
vs Temperature
VS = +5V
±2
±10
±11
mV
mV
VOS
dVOS/dT
PSRR
±7
±50
µV/°C
µV/V
µV/V
µV/month
Ω || pF
V
vs Power Supply
VS = +2.7V to +5.5V
±250
±260
Over Temperature
Long-Term Stability
Input Impedance
±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
110
dB
INPUT BIAS CURRENT
Bias Current
Offset Current
IB
IOS
±0.5
±0.5
±10
±10
pA
pA
NOISE, RTI
en
RS = 0Ω
Voltage Noise: f = 10Hz
f = 100Hz
f = 1kHz
f = 0.1Hz to 10Hz
Current Noise: f = 1kHz
500
190
100
20
nV/√Hz
nV/√Hz
nV/√Hz
µVp-p
3
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, 5)
G ≥ 10
50
25
mV
Over Temperature
Capacitance Load Drive
Short-Circuit Current
50
mV
pF
See Typical Characteristic(3)
ISC–
ISC+
8
16
mA
FREQUENCY RESPONSE
Bandwidth, –3dB
BW
G = 5
500
kHz
Slew Rate
Settling Time, 0.1%
0.01%
SR
tS
VS = 5V, G = 25
G = 5, CL = 50pF, VO = 2V step
0.4
8
12
2
V/µs
µs
µs
Overload Recovery
50% Input Overload G = 25
µs
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
40
IQ
VSD > 2.5(4)
VSD < 0.8(4)
60
70
1
Shutdown Quiescent Current/Chan ISD
0.01
TEMPERATURE RANGE
Specified Range
Operating/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 and rail only if G ≥ 10. (3) See typical characteristic Percent Overshoot vs Load Capacitance. (4) See typical characteristic Shutdown Voltage vs Supply
Voltage. (5) Output does not swing to positive rail if gain is less than 10.
3
INA322
SBOS174B
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
COMMON-MODE REJECTION RATIO
vs FREQUENCY
GAIN vs FREQUENCY
80
120
100
80
60
40
20
0
70
60
50
Gain = 500
Gain = 100
Gain = 25
40
30
20
Gain = 5
10
0
–10
–20
10
100
1k
10k
100k
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
POWER-SUPPLY REJECTION RATIO
vs FREQUENCY
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
VS = 5.5V
6
100
90
80
70
60
50
40
30
20
10
0
5
4
3
2
1
0
VS = 5.0V
VS = 2.7V
1M
10M
1
10
100
1k
10k
100k
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
NOISE vs FREQUENCY
0.1Hz TO 10Hz VOLTAGE NOISE
10k
1k
100
10
1
100
10
0.1
1s/div
1
10
100
1k
10k
100k
Frequency (Hz)
4
INA322
SBOS174B
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, 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
20k
40k
60k
80k
100k
Input Common-Mode Voltage (V)
RLoad (Ω)
QUIESCENT CURRENT AND SHUTDOWN CURRENT
vs POWER SUPPLY
QUIESCENT CURRENT AND SHUTDOWN CURRENT
vs TEMPERATURE
50
45
40
35
30
25
20
15
10
5
500
450
400
350
300
250
200
150
100
50
60
55
50
45
40
35
30
25
20
15
10
5
600
500
400
300
200
100
0
IQ
IQ
ISD
ISD
0
0
0
2.5
3
3.5
4
4.5
5
5.5
–75 –50 –25
0
25
50
75 100 125 150
Supply Voltage (V)
Temperature (°C)
SHORT-CIRCUIT CURRENT vs TEMPERATURE
SHORT-CIRCUIT CURRENT vs POWER SUPPLY
20
15
10
5
30
25
20
15
10
5
ISC+
ISC+
ISC–
ISC–
0
0
2.5
3
3.5
4
4.5
5
5.5
–75 –50 –25
0
25
50
75
100 125 150
Supply Voltage (V)
Temperature (°C)
5
INA322
SBOS174B
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
SMALL-SIGNAL STEP RESPONSE (G = 5)
SMALL-SIGNAL STEP RESPONSE (G = 100)
10µs/div
50µs/div
SMALL-SIGNAL STEP RESPONSE
(G = 5, CL = 1000pF)
SMALL-SIGNAL STEP RESPONSE
(G = 100, CL = 1000pF)
10µs/div
50µs/div
SMALL-SIGNAL STEP RESPONSE
(G = 100, CL = 5000pF)
LARGE-SIGNAL STEP RESPONSE
(G = 25, CL = 50pF)
50µs/div
50µs/div
6
INA322
SBOS174B
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
SETTLING TIME vs GAIN
100
PERCENT OVERSHOOT vs LOAD CAPACITANCE
60
50
40
30
20
10
0
Output 100mVp-p
Differential
Output 2Vp-p
90
Differential
Input Drive
80
Input Drive
G = 5
70
0.01%
60
50
40
G = 25
30
0.1%
20
10
0
1
10
100
1000
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
VOUT
Shutdown Mode
0.5
0
Part Draws Below 1µA Quiescent Current
50µs/div
2.3
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
20
18
16
14
12
10
8
20
18
16
14
12
10
8
6
6
4
4
2
2
0
0
Offset Voltage Drift (µV/°C)
Offset Voltage (mV)
7
INA322
SBOS174B
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
INPUT BIAS CURRENT vs TEMPERATURE
SLEW RATE vs TEMPERATURE
1
10k
1k
0.8
0.6
0.4
0.2
0
100
10
0
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)
CROSSTALK 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
25°C
–55°C
125°C
–55°C
0.1
1
10
100
1k
10k
100k
1M
0
2
4
6
8
10 12 14 16 18 20 22 24
Frequency (Hz)
Output Current (mA)
8
INA322
SBOS174B
OPERATING VOLTAGE
APPLICATIONS INFORMATION
The INA322 family is fully specified over a supply range of
+2.7V to +5.5V, with key parameters specified over the
temperature range of -55°C to +125°C. Parameters that vary
significantly with operating conditions, such as load condi-
tions or temperature, are shown in the Typical Characteristic
Curves.
The INA322 is a modified version of the classic “two op amp”
instrumentation amplifier, with an additional gain amplifier.
Figure 1 shows the basic connections for the operation of the
INA322 and INA2322. The power supply should be capaci-
tively decoupled with 0.1µF capacitors as close to the
INA322 as possible for noisy or high-impedance applica-
tions.
The INA322 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
160kΩ
40kΩ
5
REF
160kΩ
40kΩ
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
INA322
V+
V–
–
4
V–
RG
FIGURE 1. Basic Connections.
+5V
V+
Shutdown
VIN
+
7
Bridge
Sensor
3
5
2
8
1
6
REF(1)
VIN
VOUT
INA322
–
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 Characteristic Curves.
V–
RG
FIGURE 2. Bridge Amplifier of the INA322.
9
INA322
SBOS174B
SETTING THE GAIN
The ratio of R2 to R1, or the impedance between pins 1, 5,
and 6, determines the gain of the INA322. With an internally
set gain of 5, the INA322 can be programmed for gains
greater than 5 according to the following equation:
V+
Shutdown
VIN+
7
3
5
2
8
6
Microphone,
Hydrophone,
etc.
VOUT
INA322
REF
VIN
1
G = 5 + 5(R2/R1)
–
4
47kΩ
VB
V–
RG
The INA322 is designed to provide accurate gain, with gain
error specified to be 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.
(1)
V+
Shutdown
INPUT COMMON-MODE RANGE
VIN+
7
3
5
2
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
reference voltage according to the following equation:
8
6
VOUT
Transformer
INA322
REF
VIN
1
–
4
Center-tap
(1)
VB
V– RG
provides bias
current return
VEX
VOA1 = 5/4 VCM – 1/4 VREF
Bridge
Amplifier
V+
Shutdown
(See Typical Characteristic Curves for Input Common-
Mode Range vs Reference Voltage).
VIN+
7
INA322
4
3
5
2
Bridge
Sensor
8
1
6
VOUT
REF
VIN
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 equa-
tion:
Bridge resistance
provides bias
current return
V– RG
NOTE: (1) VB is bias voltage within
common-mode range, dependent
on REF.
VOA2 = VREF + 5(VIN+ – VIN–)
VOA2 should be less than VDD – 1.2V.
The reference pin requires a low-impedance connection.
Any resistance in series with the reference pin will degrade
the CMRR. The reference pin may be used to compensate
for the offset voltage (see Offset Trimming section). The
reference voltage level also influences the common-mode
input range (see Common-Mode Input Range section).
FIGURE 3. Providing an Input Common-Mode Path.
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
returns, and dc-coupled resistive bridge applications.
INPUT BIAS CURRENT RETURN
With a high input impedance of 1013Ω, the INA322 is ideal
for use with high-impedance sources. The input bias current
of less than 10pA makes the INA322 nearly independent of
input impedance and ideal for low-power applications.
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.
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-
10
INA322
SBOS174B
OUTPUT BUFFERING
+5V
The INA322 is optimized for a load impedance of 10kΩ or
greater. For higher output current the INA322 can be buff-
ered using the OPA340, as shown in Figure 4. The OPA340
can swing within 50mV of the supply rail, driving a 600Ω
load. The OPA340 is available in the tiny MSOP-8 package.
0.1µF
V+
7
0.1µF
Shutdown
3
5
2
VIN
REF
VIN
+
8
VOUT
6
OFFSET TRIMMING
INA322
1
VOUT
OPA340
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.
–
4
RG
FIGURE 4. Output Buffering Circuit. Able to drive loads
as low as 600Ω.
SHUTDOWN MODE
The shutdown pin of the INA322 is nominally connected to
V+. When the pin is pulled below 0.8V on a 5V supply, the
INA322 goes into sleep mode within nanoseconds.
For actual shutdown threshold, see typical characteristic curve
“Shutdown Voltage vs Supply Voltage”. Drawing less than
1µA of current, and returning from sleep mode in microsec-
onds, the shutdown feature is useful for portable applications.
Once in ‘sleep-mode’ the amplifier has high output imped-
ance, making the INA322 suitable for multiplexing.
V+
Shutdown
7
3
VIN+
8
1
REF(1)
6
5
2
VOUT
INA322
VIN–
4
V–
RG
OPA336
RAIL-TO-RAIL OUTPUT
Adjustable
Voltage
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output for gains of 10 or greater.
When the amplifier is in G = 5 the output will not swing to
positive rail. For resistive loads greater than 25kΩ, the
output voltage can swing to within a few millivolts 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
INA322’s low output impedance at high frequencies makes
it suitable for directly driving Capacitive Digital-to-Analog
(CDAC) input A/D converters, as shown in Figure 5.
NOTE: (1) REF should be adjusted for the desired output level.
The value of REF affects the common-mode input range.
FIGURE 6. Optional Offset Trimming Voltage.
INPUT PROTECTION
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.
+5V
V+
Shutdown
7
3
5
2
VIN+
REF
V+
12-Bits
8
1
VOUT
ADS7818
or
ADS7822
Shutdown
6
RLIM
INA322
7
3
5
2
VIN
+
VIN–
8
1
4
IOVERLOAD
10mA max
6
VOUT
REF
INA322
V–
RG
VIN
–
4
RLIM
fS < 100kHz
V–
RG
FIGURE 5. INA322 Directly Drives a Capacitive-Input,
A/D Converter.
FIGURE 7. Input Protection.
11
INA322
SBOS174B
OFFSET VOLTAGE ERROR CALCULATION
FEEDBACK CAPACITOR IMPROVES RESPONSE
The offset voltage (VOS) of the INA322EA has a specified
maximum of 10mV with a +5V power supply and the
common-mode voltage at VS/2. Additional specifications
for power-supply rejection and common-mode rejection are
provided to allow the user to easily calculate worst-case
expected offset under the conditions of a given application.
For optimum settling time and stability with high-imped-
ance 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 INA322’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 INA322, worst case PSRR is 250µV/V, which
means for each volt of change in power supply, the offset
may shift up to 250µV. 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
INA322
RX
6
5
2
VOUT
REF
CIN
For the INA322, the worst case CMRR over the specified
common-mode range is 60dB (at G = 25) or about
1mV/V This means that for every volt of change in com-
mon-mode, the offset will shift less than 1mV.
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
amplifier with a 3.3V supply with 1V common-mode. This
configuration varies from the specified configuration, repre-
senting 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 INA322’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 = 10mV + (1.7V • 0.250mV/V) + (0.65V • 1mV/V)
= ±11.075mV
RIN • CIN = RF • CF
However, the typical value will be closer to 2.2mV (calcu-
lated using the typical values).
Where CIN is equal to the INA322’s RG-pin input capaci-
tance (typically 3pF) plus the layout capacitance. The ca-
pacitor can be varied until optimum performance is ob-
tained.
12
INA322
SBOS174B
APPLICATION CIRCUITS
Medical ECG Applications
drive. Filtering can be modified to suit application needs by
changing the capacitor value of the output filter.
Low-Power, Single-Supply Data Acquisition
Systems
Figure 9 shows the INA322 configured to serve as a low-
cost ECG amplifier, suitable for moderate accuracy heart-
rate applications such as fitness equipment. The input sig-
nals 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
Refer to Figure 5 to see the INA322 configured to drive an
ADS7818. Functioning at frequencies of up to 500kHz, the
INA322 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
10kΩ
6
5
2
INA322
VOUT PUT
–
OPA336
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.
13
INA322
SBOS174B
PACKAGE OPTION ADDENDUM
www.ti.com
11-Jul-2013
PACKAGING INFORMATION
Orderable Device
INA2322EA/250
INA2322EA/250G4
INA322EA/250
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
-40 to 85
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
ACTIVE
TSSOP
TSSOP
VSSOP
VSSOP
VSSOP
VSSOP
PW
14
14
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
CU NIPDAU
Level-2-260C-1 YEAR
INA
2322EA
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
PW
250
250
Green (RoHS
& no Sb/Br)
Level-2-260C-1 YEAR
-40 to 85
INA
2322EA
DGK
DGK
DGK
DGK
Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR
& no Sb/Br)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
C22
C22
C22
C22
INA322EA/250G4
INA322EA/2K5
8
250
Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR
& no Sb/Br)
8
2500
2500
Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR
& no Sb/Br)
INA322EA/2K5G4
8
Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR
& no Sb/Br)
(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.
(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
11-Jul-2013
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
16-Aug-2012
TAPE AND REEL INFORMATION
*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)
INA2322EA/250
INA322EA/250
INA322EA/2K5
TSSOP
VSSOP
VSSOP
PW
DGK
DGK
14
8
250
250
180.0
180.0
330.0
12.4
12.4
12.4
6.9
5.3
5.3
5.6
3.4
3.4
1.6
1.4
1.4
8.0
8.0
8.0
12.0
12.0
12.0
Q1
Q1
Q1
8
2500
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
16-Aug-2012
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
INA2322EA/250
INA322EA/250
INA322EA/2K5
TSSOP
VSSOP
VSSOP
PW
DGK
DGK
14
8
250
250
210.0
210.0
367.0
185.0
185.0
367.0
35.0
35.0
35.0
8
2500
Pack Materials-Page 2
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products
Applications
Audio
www.ti.com/audio
amplifier.ti.com
dataconverter.ti.com
www.dlp.com
Automotive and Transportation www.ti.com/automotive
Communications and Telecom www.ti.com/communications
Amplifiers
Data Converters
DLP® Products
DSP
Computers and Peripherals
Consumer Electronics
Energy and Lighting
Industrial
www.ti.com/computers
www.ti.com/consumer-apps
www.ti.com/energy
dsp.ti.com
Clocks and Timers
Interface
www.ti.com/clocks
interface.ti.com
logic.ti.com
www.ti.com/industrial
www.ti.com/medical
Medical
Logic
Security
www.ti.com/security
Power Mgmt
Microcontrollers
RFID
power.ti.com
Space, Avionics and Defense
Video and Imaging
www.ti.com/space-avionics-defense
www.ti.com/video
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/omap
OMAP Applications Processors
Wireless Connectivity
TI E2E Community
e2e.ti.com
www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2013, Texas Instruments Incorporated
相关型号:
INA2322EA/2K5
DUAL INSTRUMENTATION AMPLIFIER, 11000uV OFFSET-MAX, 0.5MHz BAND WIDTH, PDSO14, GREEN, PLASTIC, TSSOP-14
TI
INA2322EA/2K5G4
IC DUAL INSTRUMENTATION AMPLIFIER, 11000 uV OFFSET-MAX, 0.5 MHz BAND WIDTH, PDSO14, GREEN, PLASTIC, TSSOP-14, Instrumentation Amplifier
TI
©2020 ICPDF网 联系我们和版权申明