INA2332AIPWRG4 [TI]

DUAL INSTRUMENTATION AMPLIFIER, 9000uV OFFSET-MAX, 2MHz BAND WIDTH, PDSO14, GREEN, PLASTIC, TSSOP-14;


型号：	INA2332AIPWRG4
厂家：	TEXAS INSTRUMENTS
描述：	DUAL INSTRUMENTATION AMPLIFIER, 9000uV OFFSET-MAX, 2MHz BAND WIDTH, PDSO14, GREEN, PLASTIC, TSSOP-14 放大器光电二极管
文件：	总22页 (文件大小：992K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

INA332

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

R_G

G = 5 + 5(R₂/R₁)

INA2332

INA332

40kΩ

10kΩ

V_REF

40kΩ

Ch A

10kΩ

V_OUT

V_IN–

Ch B

V_IN+

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.

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

–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

14 Shutdown A

13 _OUTA

INA332

V_IN–A

Shutdown

V+

V_IN+A

12 REFA

11 V+

V_IN–

V–

V_IN+

V_OUT

_IN+B

_IN–B

10 REFB

V–

REF

_OUTB

MSOP-8 (DGK)

RGB

Shutdown B

Dual, TSSOP-14 (PW)

INA332, INA2332

SBOS216B

www.ti.com

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= 10kΩ, G = 25, and V_CM= V_S/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

V_S= +5V

±2

±8

±9

V_OS

dV_OS/dT

PSRR

±5

±50

µV/°C

µV/V

µV/month

Ω || pF

V_S= +2.7V to +5.5V

±250

±260

±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

114

INPUT BIAS CURRENT

Bias Current

Offset Current

V_CM= V_S/2

I_B

I_OS

±0.5

±10

NOISE, RTI

R_S= 0Ω

Voltage Noise: f = 10Hz

f = 100Hz

f = 1kHz

f = 0.1Hz to 10Hz

Current Noise: f = 1kHz

e_N

280

nV/√Hz

µVp-p

i_N

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)

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⁾

G ≥ 10

Over Temperature

Capacitance Load Drive

Short-Circuit Current

See Typical Characteristics⁽³⁾

I_SC

+48/–32

FREQUENCY RESPONSE

Bandwidth, –3dB

Slew Rate

Settling Time, 0.1%

0.01%

t_S

G = 25

V_S= 5V, G = 25

G = 25, C_L= 100pF, V_O= 2V step

2.0

1.7

2.5

MHz

V/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

µA

+2.5 to +5.5

415

I_Q

V_SD> 2.5⁽⁴⁾

V_SD< 0.8⁽⁴⁾

490

600

Shutdown Quiescent Current/Chan I_SD

0.01

TEMPERATURE RANGE

Specified/Operating Range

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 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

SBOS216B

www.ti.com

TYPICAL CHARACTERISTICS

At T_A= +25°C, V_S= 5V, V_CM= V_S/2, R_L= 10kΩ, and C_L= 100pF, 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

10M

100k

100

10k

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

100

10k

100k

100

10k

100k

10M

Frequency (Hz)

0.1Hz TO 10Hz VOLTAGE NOISE

NOISE vs FREQUENCY

10k

100

0.1

1s/div

100

10k

100k

Frequency (Hz)

INA332, INA2332

SBOS216B

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= V_S/2, R_L= 10kΩ, and C_L= 100pF, 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

10k

20k

30k

40k

50k

5.5

Input Common-Mode Voltage (V)

R_LOAD(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

550

500

450

400

350

300

250

200

150

100

I_Q

I_SD

2.5

3.5

4.5

–75 –50 –25

100 125 150

Supply Voltage (V)

Temperature (°C)

SHORT-CIRCUIT CURRENT vs POWER SUPPLY

I_SC+

SHORT-CIRCUIT CURRENT vs TEMPERATURE

I_SC+

I_SC–

2.5

3.5

4.5

–75 –50 –25

75 100 125 150

Supply Voltage (V)

Temperature (°C)

INA332, INA2332

SBOS216B

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= V_S/2, R_L= 10kΩ, and C_L= 100pF, unless otherwise noted.

SMALL-SIGNAL STEP RESPONSE (G = 5)

SMALL-SIGNAL STEP RESPONSE (G = 100)

4µs/div

SMALL-SIGNAL STEP RESPONSE

(G = 5, C_L= 1000pF)

SMALL-SIGNAL STEP RESPONSE

(G = 100, C_L= 1000pF)

4µs/div

10µs/div

SMALL-SIGNAL STEP RESPONSE

(G = 100, C_L= 4700pF)

LARGE-SIGNAL STEP RESPONSE (G = 25)

10µs/div

INA332, INA2332

SBOS216B

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= V_S/2, R_L= 10kΩ, and C_L= 100pF, unless otherwise noted.

SETTLING TIME vs GAIN

PERCENT OVERSHOOT vs LOAD CAPACITANCE

100

Output 100mVp-p

Differential Drive

Output 2Vp-p

Differential

Input Drive

G = 5

0.01%

G = 25

0.1%

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

Shutdown Mode

V_OUT

0.5

Part Draws Below 1µA Quiescent Current

2.5

3.5

4.5

5.5

50µs/div

Supply Voltage (V)

OFFSET VOLTAGE DRIFT

OFFSET VOLTAGE PRODUCTION DISTRIBUTION

PRODUCTION DISTRIBUTION

Offset Voltage (mV)

Offset Voltage (µV/°C)

INA332, INA2332

SBOS216B

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_S= 5V, V_CM= V_S/2, R_L= 10kΩ, and C_L= 100pF, unless otherwise noted.

SLEW RATE vs TEMPERATURE

INPUT BIAS CURRENT vs TEMPERATURE

10000

1000

100

0.1

–75 –50 –25

75 100 125 150

–75 –50 –25

75 100 125 150

Temperature (°C)

CHANNEL SEPARATION vs FREQUENCY

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

120

100

125°C

25°C

–55°C

100

10k

100k

10M

10 15 20 25 30 35 40 45 50 55 60

Output Current (mA)

Frequency (Hz)

INA332, INA2332

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 V_OUTto RG

(V/V)

R₁

R₂

R₁

R₂

for G = 5

OPEN SHORT

100kΩ 100kΩ

10kΩ

90kΩ

100

10kΩ 190kΩ

40kΩ

10kΩ

REF

40kΩ

10kΩ

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

INA332

V+

V–

–

V–

FIGURE 1. Basic Connections.

+5V

V+

Shutdown

V_IN+

Bridge

Sensor

REF⁽¹⁾

V_IN

V_OUT

INA332

–

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–

FIGURE 2. Single-Supply Bridge Amplifier.

INA332, INA2332

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 R₂to 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

V_IN

Microphone,

Hydrophone,

etc.

V_OUT

INA332

REF

V_IN

–

COMMON-MODE INPUT RANGE

47kΩ

V_B

V–

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

V_IN+

V_OA1= 5/4 V_CM– 1/4 V_REF

V_OUT

Transformer

INA332

REF

V_IN

–

(See typical characteristic curve, Common-Mode Input Range

vs Reference Voltage).

Center-tap

provides bias

current return

(1)

V_B

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:

V_EX

Bridge

Amplifier

V+

Shutdown

V_IN

INA332

Bridge

Sensor

V_OA2= V_REF+ 5 (V_IN+ – V_IN–)

V_OUT

REF

V_IN

–

For ensured operation, V_OA2should be less than V_DD– 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) V_Bis 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

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+

0.1µF

Shutdown

V_IN

REF

V_IN

V_OUT

INA332

V_OUT

OPA340

–

V–

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

V_IN+

REF⁽¹⁾

V_OUT

INA332

V_IN–

V–

+5V

V+

Shutdown

OPA336

V_IN

REF

V_IN

Adjustable

Voltage

12-Bits

V_OUT

ADS7818

ADS7822

INA332

NOTE: (1) REF should be adjusted for the desired output level.

The value of REF affects the common-mode input range.

–

V–

FIGURE 6. Optional Offset Trimming Voltage.

f_S< 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 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.

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

R_LIM

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

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

impedance at the REF terminal to preserve good common-

mode rejection.

V_IN+

I_OVERLOAD

10mA max

V_OUT

REF

INA332

V_IN–

R_LIM

V–

FIGURE 7. Sample Output Buffering Circuit.

INA332, INA2332

SBOS216B

www.ti.com

OFFSET VOLTAGE ERROR CALCULATION

FEEDBACK CAPACITOR IMPROVES RESPONSE

The offset voltage (V_OS) of the INA332AIDGK is specified at

a maximum of 500µV 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 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, R_F, 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, R_Xand C_Lcan 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

V_IN+

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

INA332

R_X

V_OUT

REF

C_IN

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.

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 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 V_S/2.

R_IN

R_F

R_IN• C_IN= R_F• C_F

C_F

Where C_INis 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 V_OS= Maximum specified V_OS

(power-supply variation) • PSRR +

(common-mode variation) • CMRR

V_OS= 0.5mV + (1.7V • 200µV) + (0.65V • 30µV)

= ±0.860mV

R_IN• C_IN= R_F• C_F

However, the typical value will be smaller, as seen in the

Typical Characteristics.

Where C_INis 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

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.

V_R

OPA336

1.6nF

0.1µF

V+

1MΩ

Shutdown

1MΩ

100kΩ

V_IN

REF

V_IN

Left Arm

10kΩ

INA332

V_{OUT PUT}

–

OPA336

10kΩ

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.

INA332, INA2332

SBOS216B

www.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

10-Jun-2014

PACKAGING INFORMATION

Orderable Device

INA2332AIPWR

INA2332AIPWT

INA2332AIPWTG4

INA332AIDGKR

INA332AIDGKRG4

INA332AIDGKT

INA332AIDGKTG4

Status Package Type Package Pins Package

Eco Plan

Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-55 to 125

Device Marking

Samples

Drawing

Qty

(1)

(2)

(6)

(3)

(4/5)

ACTIVE

TSSOP

VSSOP

2500

Green (RoHS

& no Sb/Br)

CU NIPDAU

Level-2-260C-1 YEAR

INA

2332A

ACTIVE

250

Green (RoHS

& no Sb/Br)

CU NIPDAU

INA

2332A

Green (RoHS

& no Sb/Br)

CU NIPDAU

INA

2332A

DGK

2500

250

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

B32

Green (RoHS

& no Sb/Br)

Green (RoHS

& no Sb/Br)

250

Green (RoHS

& 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.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

10-Jun-2014

⁽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.

⁽⁶⁾Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish 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

26-Jan-2013

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)

INA2332AIPWR

INA2332AIPWT

INA332AIDGKR

INA332AIDGKT

TSSOP

VSSOP

2500

250

330.0

180.0

330.0

180.0

12.4

6.9

5.3

5.6

3.4

1.6

1.4

8.0

12.0

DGK

2500

250

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

26-Jan-2013

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

INA2332AIPWR

INA2332AIPWT

INA332AIDGKR

INA332AIDGKT

TSSOP

VSSOP

2500

250

367.0

210.0

367.0

210.0

367.0

185.0

367.0

185.0

35.0

DGK

2500

250

Pack Materials-Page 2

IMPORTANT NOTICE

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changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest

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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

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TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and

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INA2332AIPWRG4 [TI]

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