INA322EA/2K5 [TI]

INSTRUMENTATION AMPLIFIER;


型号：	INA322EA/2K5
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

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

160kΩ

40kΩ

160kΩ

REF

V_OUT

V_IN–

V_IN+

Gain = 5 + 5(R2/R1)

V_OUT= (V_IN+– V_IN–) • 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.

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

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

14 Shutdown A

13 _OUTA

_IN–A

_IN+A

V–

Shutdown

V+

12 REFA

11 V+

V_IN–

V_IN+

V_OUT

_IN+B

_IN–B

10 REFB

V–

REF

_OUTB

MSOP-8 (EA)

RGB

Shutdown B

Dual, TSSOP-14 (EA)

INA322

SBOS174B

ELECTRICAL CHARACTERISTICS: V_S= +2.7V TO +5.5V

BOLDFACE limits apply over the specified temperature range, T_A= –55°C TO +125°C

At T_A= +25°C, R_L= 25kΩ, G = 25, and I_Acommon = V_S/2, unless otherwise noted.

INA322EA

INA2322EA

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

INPUT

Input Offset Voltage, RTI

Over Temperature

vs Temperature

V_S= +5V

±2

±10

±11

V_OS

dV_OS/dT

PSRR

±7

±50

µV/°C

µV/V

µV/month

Ω || pF

vs Power Supply

V_S= +2.7V to +5.5V

±250

±260

Over Temperature

Long-Term Stability

Input Impedance

±0.4

10¹³|| 3

Input Common-Mode Range

V_S= 2.7V

V_S= 5V

V_S= 5V, V_CM= 0.55V to 3.8V

V_S= 2.7V, V_CM= 0.35V to 1.5V

0.35

0.55

1.5

3.8

Common-Mode Rejection

Over Temperature

CMRR

Crosstalk, Dual

110

INPUT BIAS CURRENT

Bias Current

Offset Current

I_B

I_OS

±0.5

±10

NOISE, RTI

e_n

R_S= 0Ω

Voltage Noise: f = 10Hz

f = 100Hz

f = 1kHz

f = 0.1Hz to 10Hz

Current Noise: f = 1kHz

500

190

100

nV/√Hz

µVp-p

fA/√Hz

GAIN⁽¹⁾

Gain Equation, Externally Set

Range of Gain

Gain Error

vs Temperature

Nonlinearity

G > 5

G = 5 + 5(R2/R1)

1000

±0.4

±10

±0.010

±0.015

V/V

ppm/°C

% of FS

±0.07

±2

±0.001

G = 5

G = 25, V_S= 5V, V_O= 0.05 to 4.95

Over Temperature

±0.002

OUTPUT

Output Voltage Swing from Rail^{(2, 5)}

G ≥ 10

Over Temperature

Capacitance Load Drive

Short-Circuit Current

See Typical Characteristic⁽³⁾

I_SC–

I_SC+

FREQUENCY RESPONSE

Bandwidth, –3dB

G = 5

500

kHz

Slew Rate

Settling Time, 0.1%

0.01%

t_S

V_S= 5V, G = 25

G = 5, C_L= 50pF, V_O= 2V step

0.4

V/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

µA

+2.5 to +5.5

I_Q

V_SD> 2.5⁽⁴⁾

V_SD< 0.8⁽⁴⁾

Shutdown Quiescent Current/Chan I_SD

0.01

TEMPERATURE RANGE

Specified Range

Operating/Storage Range

–55

–65

+125

+150

°C

Thermal Resistance

θ_JA

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.

INA322

SBOS174B

TYPICAL CHARACTERISTICS

At T_A= +25°C, V_S= 5V, V_CM= 1/2V_S, R_L= 25kΩ, C_L= 50pF, unless otherwise noted.

COMMON-MODE REJECTION RATIO

vs FREQUENCY

GAIN vs FREQUENCY

120

100

Gain = 500

Gain = 100

Gain = 25

Gain = 5

–10

–20

100

10k

100k

100

10k

100k

10M

Frequency (Hz)

POWER-SUPPLY REJECTION RATIO

vs FREQUENCY

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

V_S= 5.5V

100

V_S= 5.0V

V_S= 2.7V

10M

100

10k

100k

100

10k

100k

Frequency (Hz)

NOISE vs FREQUENCY

0.1Hz TO 10Hz VOLTAGE NOISE

10k

100

0.1

1s/div

100

10k

100k

Frequency (Hz)

INA322

SBOS174B

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= 1/2V_S, R_L= 25kΩ, C_L= 50pF, unless otherwise noted.

COMMON-MODE INPUT RANGE

vs REFERENCE VOLTAGE

OUTPUT SWING vs LOAD RESISTANCE

Outside of Normal Operation

To Positive Rail

REF

Increasing

To Negative Rail

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

500

450

400

350

300

250

200

150

100

600

500

400

300

200

100

I_Q

I_SD

2.5

3.5

4.5

5.5

–75 –50 –25

75 100 125 150

Supply Voltage (V)

Temperature (°C)

SHORT-CIRCUIT CURRENT vs TEMPERATURE

SHORT-CIRCUIT CURRENT vs POWER SUPPLY

I_SC+

I_SC–

2.5

3.5

4.5

5.5

–75 –50 –25

100 125 150

Supply Voltage (V)

Temperature (°C)

INA322

SBOS174B

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= 1/2V_S, R_L= 25kΩ, C_L= 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, C_L= 1000pF)

SMALL-SIGNAL STEP RESPONSE

(G = 100, C_L= 1000pF)

10µs/div

50µs/div

SMALL-SIGNAL STEP RESPONSE

(G = 100, C_L= 5000pF)

LARGE-SIGNAL STEP RESPONSE

(G = 25, C_L= 50pF)

50µs/div

INA322

SBOS174B

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= 1/2V_S, R_L= 25kΩ, C_L= 50pF, unless otherwise noted.

SETTLING TIME vs GAIN

100

PERCENT OVERSHOOT vs LOAD CAPACITANCE

Output 100mVp-p

Differential

Output 2Vp-p

Differential

Input Drive

G = 5

0.01%

G = 25

0.1%

100

1000

100

10k

Gain (V/V)

Load Capacitance (pF)

SHUTDOWN VOLTAGE vs SUPPLY VOLTAGE

Operation in this Region

SHUTDOWN TRANSIENT BEHAVIOR

2.5

V_SD

is not Recommended

Normal Operation Mode

1.5

V_OUT

Shutdown Mode

0.5

Part Draws Below 1µA Quiescent Current

50µs/div

2.3

3.5

4.5

5.5

Supply Voltage (V)

OFFSET VOLTAGE DRIFT

PRODUCTION DISTRIBUTION

OFFSET VOLTAGE PRODUCTION DISTRIBUTION

Offset Voltage Drift (µV/°C)

Offset Voltage (mV)

INA322

SBOS174B

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= 1/2V_S, R_L= 25kΩ, C_L= 50pF, unless otherwise noted.

INPUT BIAS CURRENT vs TEMPERATURE

SLEW RATE vs TEMPERATURE

10k

0.8

0.6

0.4

0.2

100

0.1

–75 –50 –25

100 125 150

–75 –50 –25

100 125 150

Temperature (°C)

CROSSTALK vs FREQUENCY

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

120

100

125°C

25°C

–55°C

125°C

–55°C

0.1

100

10k

100k

10 12 14 16 18 20 22 24

Frequency (Hz)

Output Current (mA)

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 V_OUTto RG

(V/V)

R₁

R₂

R₁

R₂

for G = 5

OPEN SHORT

100kΩ 100kΩ

10kΩ

90kΩ

100

10kΩ 190kΩ

160kΩ

40kΩ

REF

160kΩ

40kΩ

V_O= ((V_IN+) – (V_IN–)) • G

V_IN

–

V_IN+

Also drawn in simplified form:

V+

Shutdown

V_IN

REF

V_IN

(For Single

Supply)

Shutdown

0.1µF

V_OUT

INA322

V+

V–

–

V–

FIGURE 1. Basic Connections.

+5V

V+

Shutdown

V_IN

Bridge

Sensor

REF⁽¹⁾

V_IN

V_OUT

INA322

–

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–

FIGURE 2. Bridge Amplifier of the INA322.

INA322

SBOS174B

SETTING THE GAIN

The ratio of R₂to 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

V_IN+

Microphone,

Hydrophone,

etc.

V_OUT

INA322

REF

V_IN

G = 5 + 5(R₂/R₁)

–

47kΩ

V_B

V–

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

V_IN+

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:

V_OUT

Transformer

INA322

REF

V_IN

–

Center-tap

(1)

V_B

V– RG

provides bias

current return

V_EX

V_OA1= 5/4 V_CM– 1/4 V_REF

Bridge

Amplifier

V+

Shutdown

(See Typical Characteristic Curves for Input Common-

Mode Range vs Reference Voltage).

V_IN+

INA322

Bridge

Sensor

V_OUT

REF

V_IN

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) V_Bis bias voltage within

common-mode range, dependent

on REF.

V_OA2= V_REF+ 5(V_IN+ – V_IN–)

V_OA2should be less than V_DD– 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-

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+

0.1µF

Shutdown

V_IN

REF

V_IN

V_OUT

OFFSET TRIMMING

INA322

V_OUT

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

V_OUTis +1. An op-amp buffer is used to provide low

impedance at the REF terminal to preserve good common-

mode rejection.

–

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

V_IN+

REF⁽¹⁾

V_OUT

INA322

V_IN–

V–

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 R_LIM, 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

V_IN+

REF

V+

12-Bits

V_OUT

ADS7818

ADS7822

Shutdown

R_LIM

INA322

V_IN

V_IN–

I_OVERLOAD

10mA max

V_OUT

REF

INA322

V–

V_IN

–

R_LIM

f_S< 100kHz

V–

FIGURE 5. INA322 Directly Drives a Capacitive-Input,

A/D Converter.

FIGURE 7. Input Protection.

INA322

SBOS174B

OFFSET VOLTAGE ERROR CALCULATION

FEEDBACK CAPACITOR IMPROVES RESPONSE

The offset voltage (V_OS) of the INA322EA has a specified

maximum of 10mV with a +5V power supply and the

common-mode voltage at V_S/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, R_F, 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, R_Xand C_Lcan 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

V_IN+

CMRR (in µV/V) = 10^{[(CMRR in dB)/–20]}• 10⁶

INA322

R_X

V_OUT

REF

C_IN

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.

C_L

V_IN–

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

V_S/2.

R_IN

R_F

R_IN• C_IN= R_F• C_F

C_F

Where C_INis 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 V_OS= Maximum specified V_OS

(power-supply variation) • PSRR +

(common-mode variation) • CMRR

V_OS= 10mV + (1.7V • 0.250mV/V) + (0.65V • 1mV/V)

= ±11.075mV

R_IN• C_IN= R_F• C_F

However, the typical value will be closer to 2.2mV (calcu-

lated using the typical values).

Where C_INis 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.

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.

V_R

OPA336

1.6nF

0.1µF

V+

1MΩ

Shutdown

1MΩ

100kΩ

V_IN

REF

V_IN

Left Arm

10kΩ

INA322

V_{OUT PUT}

–

OPA336

Right Arm

V_R

+5V

V–

1MΩ

2MΩ

2kΩ

V_R= +2.5V

Right

Leg

OPA336

2kΩ

FIGURE 9. Simplified ECG Circuit for Medical Applications.

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

VSSOP

250

Green (RoHS

& no Sb/Br)

CU NIPDAU

Level-2-260C-1 YEAR

INA

2322EA

ACTIVE

250

Green (RoHS

& no Sb/Br)

Level-2-260C-1 YEAR

-40 to 85

INA

2322EA

DGK

Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR

& no Sb/Br)

-55 to 125

C22

INA322EA/250G4

INA322EA/2K5

250

Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR

& no Sb/Br)

2500

Green (RoHS CU NIPDAUAG Level-2-260C-1 YEAR

& no Sb/Br)

INA322EA/2K5G4

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

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

INA2322EA/250

INA322EA/250

INA322EA/2K5

TSSOP

VSSOP

DGK

250

180.0

330.0

12.4

6.9

5.3

5.6

3.4

1.6

1.4

8.0

12.0

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

DGK

250

210.0

367.0

185.0

367.0

35.0

2500

Pack Materials-Page 2

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