INA333

Instrumentation Amplifier

The INA333 is a instrumentation amplifier from Texas Instruments. View the full INA333 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

Key Specifications

Parameter	Value
Common Mode Rejection Ratio (CMRR)	100dB
Features	External resistor gain;Zero drift / auto-zero;EMI filtering/RF suppression
Ib - Input Bias Current	200pA
Input Offset Current(Ios)	200pA
Input Offset Voltage Drift(Vos TC)	100nV/℃
Maximum Power Supply Range (Vdd-Vss)	5.5V
Noise density(eN)	50nV/√Hz@1kHz
Number of Channels	1
Operating Temperature	-40℃~+125℃ °C
Quiescent Current	50uA
Rail to Rail	Rail-to-rail output
Single Supply	1.8V~5.5V
Slew Rate	0.16V/us V/µs
Vos - Input Offset Voltage	25uV

Overview

Part: INA333 — Texas Instruments

Type: Micro-power, Zero-Drift, Rail-to-Rail Output Instrumentation Amplifier

Description: A low-power, precision instrumentation amplifier with excellent accuracy, featuring a 1.8V to 5.5V supply range, 50 μA quiescent current, and a gain settable from 1 to 1000 with a single external resistor.

Operating Conditions:

Supply voltage: 1.8 V to 5.5 V
Operating temperature: -40°C to +125°C
Gain range: 1 to 1000

Absolute Maximum Ratings:

Max supply voltage: 7 V
Max junction temperature: 150 °C
Max storage temperature: 150 °C

Key Specs:

Low offset voltage: ±25 μV (max, G ≥ 100)
Low offset voltage drift: ±0.1 μV/°C (max, G ≥ 100)
Low noise: 50 nV/√Hz (G = 100, f = 1 kHz)
High Common-Mode Rejection Ratio (CMRR): 100 dB (min, G ≥ 10, DC to 60 Hz)
Low input bias current: ±200 pA (max)
Low quiescent current: 50 μA (typ)
Bandwidth: 150 kHz (G = 1), 3.5 kHz (G = 100)

Features:

Low offset voltage: 25μV (maximum), G ≥ 100
Low drift: 0.1 μV/°C, G ≥ 100
Low noise: 50nV/√Hz, G ≥ 100
High common-mode rejection ratio (CMRR): 100dB (minimum), G ≥ 10
Low input bias current: 200pA (maximum)
Power supply range: 1.8V to 5.5V
Low quiescent current: 50 μA
RFI filtered inputs
Gain set by a single external resistor (G = 1 + (100kΩ/RG))
Auto-calibration technique for excellent accuracy

Applications:

Bridge amplifiers
ECG amplifiers
Pressure sensors
Medical instrumentation
Portable instrumentation
Weigh scales
Thermocouple amplifiers
RTD sensor amplifiers
Data acquisition

Package:

VSSOP (8) - 3.00mm × 3.00mm
WSON (8) - 3.00mm x 3.00mm

Pin Configuration

Electrical Characteristics

for VS = 1.8 V to 5.5 V at TA = 25°C, RL = 10 k Ω , VREF = VS / 2, and G = 1 (unless otherwise noted)

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT (1)	INPUT (1)	INPUT (1)	INPUT (1)	INPUT (1)	INPUT (1)	INPUT (1)
V OSI	Offset voltage, RTI (2)			±10 ±25/G	±25 ±75/G	μ V
	vs temperature	T A = -40°C to +125°C			±0.1 ±0.5 / G	μ V/°C
PSR	vs power supply Long-term stability	1.8 V ≤ V S ≤ 5.5 V		±1 ±5/G See (3)	±5 ±15/G	μ V/V
	Turnon time to specified V OSI Impedance	T A = -40°C to +125°C	See	Typical Characteristics
Z IN	Differential			100 \	\	3
Z IN	Common-mode			100 \	\	3
V CM	Common-mode voltage range	V O = 0 V	(V-) + 0.1		(V+) - 0.1	V
CMR	Common-mode rejection	DC to 60 Hz
	G = 1	V CM = (V-) + 0.1 V to (V+) - 0.1 V	80	90		dB
	G = 10	V CM = (V-) + 0.1 V to (V+) - 0.1 V	100	110		dB
	G = 100	V CM = (V-) + 0.1 V to (V+) - 0.1 V	100	115		dB
	G = 1000	V CM = (V-) + 0.1 V to (V+) - 0.1 V	100	115		dB
INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT
I	Input bias current			±70	±200	pA
B	vs temperature	T A = -40°C to +125°C		See Figure 26		pA/°C
	Input offset current			±50	±200	pA
I OS	vs temperature	T A = -40°C to +125°C		See Figure 28		pA/°C
INPUT VOLTAGE NOISE	INPUT VOLTAGE NOISE	INPUT VOLTAGE NOISE G = 100, R S = 0 Ω , f = 10 Hz G = 100, R S = 0 Ω , f = 100 Hz	INPUT VOLTAGE NOISE	INPUT VOLTAGE NOISE 50 50	INPUT VOLTAGE NOISE	INPUT VOLTAGE NOISE nV/ √ Hz nV/ √ Hz
e NI	Input voltage noise	G = 100, R S = 0 Ω , f = 1 kHz G = 100, R S = 0 Ω , f = 0.1 Hz to 10 Hz f = 10 Hz		50 1 100		nV/ √ Hz μ V PP fA/ √ Hz
i N	Input current noise	f = 0.1 Hz to 10 Hz		2		pA PP
GAIN	GAIN	GAIN	GAIN	GAIN	GAIN	GAIN
G	Gain equation			1 + (100 k Ω /R G )		V/V
	Range of gain	V S = 5.5 V, (V-) + 100 mV ≤ V O ≤ (V+) - 100 mV G = 1	1	±0.01%	1000 ±0.1%	V/V
	Gain error	G = 10 G = 100 G = 1000		±0.05% ±0.07% ±0.25%	±0.25% ±0.25% ±0.5%
	Gain vs temperature, G = 1	T A = -40°C to +125°C		±1	±5	ppm/°C
	Gain vs temperature, G > 1 (4) Gain nonlinearity	T A = -40°C to +125°C V S = 5.5 V, (V-) + 100 mV ≤ V ≤ (V+) - 100 mV		±15	±50	ppm/°C
	Gain nonlinearity, G = 1 to 1000	R L = 10 k Ω		10		ppm
OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT
	Output voltage swing from rail Capacitive load drive	V S = 5.5 V, R L = 10 k Ω		See Figure 29 500	50	mV pF
I SC	Short-circuit current	Continuous to common		-40, +5		mA

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

	MIN	MAX	UNIT
Supply voltage	7		V
Analog input voltage (2)	(V-) - 0.3	(V+) + 0.3	V
Output short-circuit (3)	Continuous	Continuous
Operating temperature, T A	-40	150	°C
Junction temperature, T J		150	°C
Storage temperature, T stg	-65	150	°C

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	MAX	UNIT
VS	Supply voltage	1.8	5.5	V
	Specified temperature	-40	125	°C

Thermal Information

		INA333	INA333
THERMAL METRIC	(1)	DGK (VSSOP)	DRG (WSON)
		8 PINS	8 PINS
R θ JA	Junction-to-ambient thermal resistance	169.5	60
R θ JC(top)	Junction-to-case (top) thermal resistance	62.7	60
R θ JB	Junction-to-board thermal resistance	90.3	50
ψ JT	Junction-to-top characterization parameter	7.6	-
ψ JB	Junction-to-board characterization parameter	88.7	-
R θ JC(bot)	Junction-to-case (bottom) thermal resistance	-	6

Typical Application

The INA333 measures small differential voltage with high common-mode voltage developed between the noninverting and inverting input. The high input impedance makes the INA333 suitable for a wide range of applications. The ability to set the reference pin to adjust the functionality of the output signal offers additional flexibility that is practical for multiple configurations.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
INA333-Q1	Texas Instruments	—
INA333AIDGKR	TI	MSOP-8

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