Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp, Op-amp InAmp VSSOP 8

FEATURES

D LOW QUIESCENT CURRENT: 40µA/channel

Shut Down: < 1µA

D HIGH GAIN ACCURACY: G = 5, 0.02%,

2ppm/°C

D GAIN SET WITH EXTERNAL RESISTORS

D LOW OFFSET VOLTAGE: ±200µV

D HIGH CMRR: 94dB

D LOW BIAS CURRENT: 10pA

D BANDWIDTH: 500kHz, G = 5V/V

D RAIL-TO-RAIL OUTPUT SWING: (V+) − 0.02V

D WIDE TEMPERATURE RANGE:

−55°C to +125°C

D SINGLE VERSION IN MSOP-8 PACKAGE AND

DUAL VERSION IN TSSOP-14 PACKAGE

DESCRIPTION

The INA321 family is a series of rail-to-rail output,

micropower CMOS instrumentation amplifiers that offer

wide-range, single-supply, as well as bipolar-supply

operation. The INA321 family provides low-cost, low-noise

amplification of differential signals with micropower

current consumption of 40µA. When shutdown, the

INA321 has a quiescent current of less than 1µA.

Returning to normal operations within microseconds, the

shutdown feature makes the INA321 optimal for

low-power battery or multiplexing applications.

Configured internally for 5V/V gain, the INA321 offers

exceptional flexibility with user-programmable external

gain resistors. The INA321 reduces common-mode error

over frequency and with CMRR remaining high up to 3kHz,

line noise and line harmonics are rejected.

The low-power design does not compromise on bandwidth

or slew rate, making the INA321 ideal for driving sample

Analog-to-Digital (A/D) converters as well as

general-purpose applications. With high precision, low

cost, and small packaging, the INA321 outperforms

discrete designs, while offering reliability and

performance.

APPLICATIONS

D INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermistor, Position

D PHYSIOLOGICAL AMPLIFIERS:

ECG, EEG, EMG

D A/D CONVERTER SIGNAL CONDITIONING

D DIFFERENTIAL LINE RECEIVERS WITH GAIN

D FIELD UTILITY METERS

D PCMCIA CARDS

D COMMUNICATION SYSTEMS

D TEST EQUIPMENT

D AUTOMOTIVE INSTRUMENTATION

CMRR vs FREQUENCY

Frequency (Hz)

CMRR (dB)

1k10 100 10k

120

100

INA321

Nearest

Competition

10x

Improvement

160kΩ

REF

−

IN+

40kΩ 40kΩ

Shutdown V+

OUT

=(V

IN+

− V

−

) • Gain

Gain=5+5(R2/R1)

−

160kΩ

INA321

INA2321

SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006

microPower, Single-Supply, CMOS

Instrumentation Amplifier

www.ti.com

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.

         

          

 !     !   

Summary of content (22 pages)

PAGE 1
INA321 INA2321 SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 microPower, Single-Supply, CMOS Instrumentation Amplifier FEATURES APPLICATIONS D LOW QUIESCENT CURRENT: 40µA/channel D INDUSTRIAL SENSOR AMPLIFIERS: D D D D D D D D D Shut Down: < 1µA HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C GAIN SET WITH EXTERNAL RESISTORS LOW OFFSET VOLTAGE: ±200µV HIGH CMRR: 94dB LOW BIAS CURRENT: 10pA BANDWIDTH: 500kHz, G = 5V/V RAIL-TO-RAIL OUTPUT SWING: (V+) − 0.
PAGE 2
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 ELECTROSTATIC DISCHARGE SENSITIVITY 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 Output Short-Circuit(3) . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous This integrated circuit can be damaged by ESD.
PAGE 3
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V BOLDFACE limits apply over the specified temperature range, TA = −555C to +1255C. At TA = +25°C, RL = 25kΩ, G = 25, and IA common = VS/2, unless otherwise noted. INA321EA INA2321EA INA321E PARAMETER CONDITIONS MIN TYP MAX ±0.2 ±0.5 MIN TYP MAX UNIT 1 mV INPUT Input Offset Voltage, RTI Over Temperature VS = +5V vs Temperature VOS dVOS/dT vs Power Supply PSRR 2.
PAGE 4
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued) BOLDFACE limits apply over the specified temperature range, TA = −555C to +1255C. At TA = +25°C, RL = 25kΩ, G = 25, and IA common = VS/2, unless otherwise noted. INA321EA INA2321EA INA321E PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT FREQUENCY RESPONSE Bandwidth, −3dB BW G=5 500 ∗ kHz Slew Rate SR VS = 5V, G = 25 G = 5, CL = 50pF, VO = 2V step 0.
PAGE 5
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 TYPICAL CHARACTERISTICS At TA = +25°C, VS = 5V, VCM =1/2VS, RL = 25kΩ, and CL = 50pF, unless otherwise noted.
PAGE 6
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, VCM =1/2VS, RL = 25kΩ, and CL = 50pF, unless otherwise noted.
PAGE 7
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, VCM =1/2VS, RL = 25kΩ, and CL = 50pF, unless otherwise noted.
PAGE 8
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, VCM =1/2VS, RL = 25kΩ, and CL = 50pF, unless otherwise noted. PERCENT OVERSHOOT vs LOAD CAPACITANCE SETTLING TIME vs GAIN 60 100 Output 2VPP Differential Input Drive Settling Time (µs) 80 Output 100mVPP Differential Input Drive 50 70 Overshoot (%) 90 0.01% 60 50 40 30 G=5 40 30 G = 25 20 0.
PAGE 9
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = 5V, VCM =1/2VS, RL = 25kΩ, and CL = 50pF, unless otherwise noted. INPUT BIAS CURRENT vs TEMPERATURE 10k 0.8 1k Input Bias Current (pA) Slew Rate (V/µs) SLEW RATE vs TEMPERATURE 1 0.6 0.4 0.2 0 −75 −50 100 10 0 0.
PAGE 10
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 APPLICATIONS INFORMATION The INA321 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 INA321 and INA2321. The power supply should be capacitively decoupled with 0.1µF capacitors as close to the INA321 as possible for noisy or high-impedance applications.
PAGE 11
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 SETTING THE GAIN The ratio of R2 to R1, or the impedance between pins 1, 5, and 6, determines the gain of the INA321. With an internally set gain of 5, the INA321 can be programmed for gains greater than 5 according to the following equation: 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.
PAGE 12
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 OUTPUT BUFFERING The INA321 is optimized for a load impedance of 10kΩ or greater. For higher output current the INA321 can be buffered 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.
PAGE 13
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 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.
PAGE 14
"#$ #"#$ www.ti.com SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006 APPLICATION CIRCUITS Medical ECG Applications optional right leg drive. Filtering can be modified to suit application needs by changing the capacitor value of the output filter. Figure 9 shows the INA321 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.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.com 24-Jan-2013 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.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing INA2321EA/250 TSSOP PW 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 INA321E/250 VSSOP DGK 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 INA321E/2K5 VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA2321EA/250 TSSOP PW 14 250 210.0 185.0 35.0 INA321E/250 VSSOP DGK 8 250 210.0 185.0 35.0 INA321E/2K5 VSSOP DGK 8 2500 367.0 367.0 35.0 INA321EA/250 VSSOP DGK 8 250 210.0 185.0 35.0 INA321EA/2K5 VSSOP DGK 8 2500 367.0 367.0 35.
PAGE 19
PAGE 20
PAGE 21
PAGE 22
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.