The INA630 incorporates a JFET clamping structure provide low series resistance under normal conditions. In

the fault case when the inputs are more than the maximum differential input voltage of ±125mV, the protection

circuitry limits the input current to a value of approximately 40μA.

INP

INN

R4

R3

V

S-

V

S+

V

DIFF > 125 mV

+

-

GND

Figure 7-6. Input Current Path During Large Differential Input Voltage Condition

Note

Many instrumentation amplifiers include a JFET clamping circuit that protect the device for input

voltages exceeding supply voltages. In the INA630, the JFET clamping structure is connected

between the input pins to protect the device against differential input overloading.

Differential Input Voltage (V)

-20

-15

-10

-5

0

5

10

15

20

-40

-30

-25

-20

-10

-10

5

0

20

10

35

20

50

30

IBN

IBP

Output Voltage

Figure 7-7. Input Current (IBP, IBN) vs Differential Input Voltage

7.4 Device Functional Modes

The INA630 has a single functional mode and is operational when the power supply voltage is greater than 4.5V

(±2.25V). The maximum power-supply voltage for the INA630 is 36V (±18V).

INA630

SBOSAI8 – MARCH 2025

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