INA630 Precision, 126dB CMRR, Indirect Current Feedback Instrumentation Amplifier

1 Features

• Optimized for cost and size sensitive applications

• Super-beta bipolar precision:

– High common-mode rejection: 126dB

(minimum) for G = 20V/V to 1000V/V

– Low offset voltage: 60µV (typical), 350µV

(maximum)

– Low offset voltage drift: 0.7µV/°C (typical),

2µV/°C (maximum)

– Low gain non-linearity: 10ppm (G = 100V/V)

(maximum)

– High power supply rejection: 123dB (minimum)

for G = 20V/V to 1000V/V

– Voltage noise density: 40nV/√Hz at f = 1kHz

• Gain set with external resistor divider for G ≥

20V/V

– Maximum differential input voltages of ±125mV

• Bandwidth: 550kHz (G = 20), 100kHz (G = 100)

• Supply range:

– Single-supply: 4.5V to 36V

– Dual-supply: ±2.25V to ±18V

– Supply current: 300µA (typical)

• Specified temperature range: –40°C to +125°C

2 Applications

• Battery cell formation & test equipment

• Flat panel display (FPD) shorting bar pattern

generator

• Electrocardiogram (ECG)

• Weigh scale

3 Description

The INA630 is a high-precision instrumentation

amplifier that offers low power consumption and

operates over a wide single-supply or dual-supply

range. The INA630 is optimized for small differential

voltages

(±125mV

maximum)

while

providing

excellent common-mode suppression (126dB CMRR).

The INA630 offers flexible gain setting with an

external resistor divider of minimum G = 20V/V.

The INA630 is based on an indirect current

feedback architecture that offers low gain error

and non-linearity. Due to the architecture the

reference pin impedance does not degrade the

CMRR performance. The device enables wider input

and output voltage range compared to traditional

instrumentation amplifiers. The device has high

precision as a result of super-beta input transistors,

which provide low input offset voltage, offset voltage

drift, low bias current and current noise.

Package Information

PART NUMBER

PACKAGE (1)

PACKAGE SIZE(2)

INA630

DDF (SOT-23-THN, 8)

2.9mm × 2.8mm

(1)

For all available packages, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

gm1

gm2

R2

R1

+

–

GND

+

–

VDM/2

VDM/2

1

+

+

+

VOUT

VFB

VREF

VS

VS+

VINN

VINP

+

+

gm3

VCM

INA630 Simplified Internal Schematic

Frequency (Hz)

40

60

80

100

120

140

100m

1

10

100

1k

10k

100k

1M

G = 20

G = 100

CMRR vs Frequency (RTI)

INA630

SBOSAI8A – MARCH 2025 – REVISED JULY 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.