الصفحة الرئيسية > الدوائر المتكاملة الدوائر المتكاملة > الدوائر المتكاملة الخطية التناظرية > INA828AIDR

INA828AIDR

50µV offset, 7nV/√Hz in-amp, 140dB CMRR, ±40V OVP, G=1-1000, 650µA, super-beta, 8-SOIC

5600

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جزء الشركة المصنعة ： جزء الشركة المصنعة

INA828AIDR

الحزمة ： الحزمة

8-SOIC (4.9 x 3.9 x 1.5mm)

العلامة التجارية ： العلامة التجارية

فئات المنتجات:：فئات المنتجات

الدوائر المتكاملة الخطية التناظرية, الدوائر المتكاملة الدوائر المتكاملة

توصيات أخرى قد تكون مهتماً بها.

SII9396SCNUC-BAR

IS43TR16256BL-125KBLI

الوصف

نظرة عامة على المنتج

The INA828AIDR is a high-precision instrumentation amplifier from Texas Instruments with 50µV max offset, 7nV/√Hz noise, and 0.5µV/°C offset drift — achieved through super-beta input transistors. With 140dB CMRR at G=10, ±40V input overvoltage protection, and only 650µA supply current, it is the second-generation upgrade to the classic INA128. The single-resistor gain range (1 to 1000) and 8-SOIC package suit precision industrial and medical applications.

المواصفات الرئيسية

جهد إزاحة المدخلات	50 µV maximum
Offset Drift	0.5 µV/°C maximum
Input Voltage Noise	7 nV/√Hz @ 1kHz
0.1-10Hz Noise	0.14 µVp-p (G=1)
CMRR (G=1)	90 dB minimum
CMRR (G=10)	110 dB minimum
PSRR (G=1)	100 dB minimum
Gain Range	1 to 1000 (single resistor)
Gain Drift	5 ppm/°C (G=1); 50 ppm/°C (G>1)
Gain Error	±0.15% maximum
Gain Nonlinearity	±0.002% maximum
تيار تحيز الإدخال	0.6 nA maximum
Bandwidth (G=1)	2 MHz
Bandwidth (G=100)	260 kHz
جهد الإمداد	4.5V to 36V (single); ±2.25V to ±18V (dual)
Supply Current	650 µA maximum
Input Overvoltage	±40V protection
الحزمة	8-SOIC (4.9 x 3.9mm)
درجة حرارة التشغيل	-40 درجة مئوية إلى +125 درجة مئوية

الميزات

Super-beta input transistors for ultra-low noise and drift
50µV max offset — 4x better than INA128
7nV/√Hz input noise — industry-best for this class
140dB CMRR at G=10 for superior common-mode rejection
±40V input overvoltage protection without damage
Stable with up to 1nF capacitive load
Single external resistor sets gain from 1 to 1000
650µA max supply current — very low power
Drop-in upgrade for INA128 (pin-compatible)
5V single-supply to ±18V dual-supply operation

التطبيقات

Industrial process control signal conditioning
Medical ECG and biopotential amplifiers
Precision data acquisition systems
Battery tester and monitoring circuits
Bridge and load cell amplifiers
Power automation and metering

مقدمة المنتج:INA828AIDR مقدمة المنتج

The INA828AIDR is a second-generation high-precision instrumentation amplifier from Texas Instruments that significantly improves upon the classic INA128. Using super-beta input transistors, it achieves 50µV maximum input offset (4x better than INA128’s 200µV), 7nV/√Hz input noise density, 0.5µV/°C offset drift, and only 0.6nA input bias current. The 140dB minimum CMRR at G=10 provides outstanding common-mode rejection in noisy industrial environments. Input protection circuitry tolerates ±40V overvoltage without damage. Gain is set from 1 to 1000 with a single external resistor using the standard G = 1 + (49.4kΩ/RG) formula. The device is pin-compatible with the INA128, enabling direct upgrades in existing designs. Operating from 4.5V single supply to ±18V dual supplies with only 650µA supply current, it suits both portable and industrial applications.

مبدأ العمل:INA828AIDR مبدأ العمل

The INA828 uses a three-op-amp instrumentation amplifier architecture with super-beta input transistors. The input stage consists of two matched transconductance amplifiers whose feedback current flows through the gain resistor RG. The gain formula is G = 1 + (49.4kΩ/RG). The super-beta transistors provide extremely high current gain (β > 1000), resulting in sub-nanoampere input bias currents and correspondingly low input-referred noise and offset. The output stage is a difference amplifier that converts the internal differential signal to a single-ended output referenced to the REF pin. The ±40V input protection uses back-to-back diodes and current-limiting resistors that clamp input voltages without affecting normal operation. The device is compensated to remain stable with up to 1nF of capacitive load on the output, allowing direct connection to ADC input networks without additional buffering. The reference pin enables output level shifting for single-supply applications.

وصف الدبوس:INA828AIDR تعريف الدبوس ووظائفه

دبوس	الاسم	الوصف
1	RG	Gain resistor terminal 1
2	-IN	Inverting input
3	+IN	Non-inverting input
4	-VS	Negative supply (or GND for single supply)
5	REF	Reference (output offset) input
6	انتهى	Amplifier output
7	+VS	Positive supply (4.5V to 36V)
8	RG	Gain resistor terminal 2

Application Scenarios:In which products and applications isINA828AIDR مستعمل

Precision Bridge Amplifier: Amplify a 10mV full-scale load cell output at G=1000 with 0.14µVp-p low-frequency noise. The 140dB CMRR at G=10 (and increasing at higher gains) rejects ground-loop and electromagnetic interference from nearby motor drives. The 0.002% gain nonlinearity preserves measurement accuracy over the full load range. The REF pin shifts the output to mid-supply for single-supply ADC interfacing.
ECG Front-End: Amplify biopotential signals (0.5mV to 5mV) with G=500. The 7nV/√Hz input noise yields a total input noise of only ~30nV/√Hz at G=500, revealing subtle ECG features. The ±40V input protection handles defibrillator discharge events without damage. The 0.6nA bias current is low enough to not polarize wet ECG electrodes. The 90dB CMRR at G=1 (higher at G=500) rejects 50/60Hz common-mode interference.
4-20mA Loop Current Sense: Measure the voltage across a precision shunt in a 4-20mA loop. At G=100, the INA828 provides a 0.4-2V output from a 4-20mV shunt signal. The ±40V input protection handles loop fault voltages. The 0.5µV/°C offset drift ensures stable zero readings over ambient temperature variations. The 100dB PSRR rejects power supply noise in industrial environments.

Alternative Models:What chips are recommended as replacements for INA828AIDR

الطراز	Offset	Noise	CMRR (G=10)	الفرق الرئيسي
INA128	50µV typ	10nV/√Hz	120dB	First generation, higher noise
INA826	50µV	22nV/√Hz	90dB	Wider supply, lower CMRR
AD8429BRZ	50µV	1nV/√Hz	90dB	ADI, ultra-low noise, lower CMRR
INA819	25µV	7nV/√Hz	140dB	TI, even higher precision