INA114AP datasheet(10/17 Pages) TI1

10 / 17 page

INA114

–

OPA602

511

Ω

22.1k

Ω

22.1k

Ω

Ref

For G = 100

G = 511Ω // 2(22.1kΩ)

effective R

G = 505Ω

100

Ω

Shield is driven at the

common-mode potential.

current limit behavior. The inputs are protected even if no

power supply voltage is present.

OUTPUT VOLTAGE SENSE (SOL-16 package only)

The surface-mount version of the INA114 has a separate

output sense feedback connection (pin 12). Pin 12 must be

connected to the output terminal (pin 11) for proper opera-

tion. (This connection is made internally on the DIP version

of the INA114.)

The output sense connection can be used to sense the output

voltage directly at the load for best accuracy. Figure 5 shows

how to drive a load through series interconnection resis-

tance. Remotely located feedback paths may cause instabil-

ity. This can be generally be eliminated with a high

frequency feedback path through C

1. Heavy loads or long

lines can be driven by connecting a buffer inside the feed-

back path (Figure 6).

FIGURE 4. Voltage Swing of A

1 and A2.

FIGURE 5. Remote Load and Ground Sensing.

FIGURE 6. Buffered Output for Heavy Loads.

FIGURE 7. Shield Driver Circuit.

25k

Ω

25k

Ω

25k

Ω

25k

Ω

V+

V–

INA114

O = G • VD

G = 1 +

50k

Ω

25k

Ω

25k

Ω

CM –

G • V

CM +

G • V

Over-Voltage

Protection

Over-Voltage

Protection

INA114

–

Load

Equal resistance here preserves

good common-mode rejection.

1000pF

Output

Sense

Ref

Surface-mount package

version only.

INA114

–

L: ±100mA

Output

Sense

Ref

Surface-mount package

version only.

OPA633

180

Ω

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