INA103 datasheet(10/24 Pages) TI2

10 / 24 page

INA103

Figure 6 shows an active control loop that adjusts the output

offset voltage to zero. A

2, R, and C form an integrator that

produces an offsetting voltage applied to one input of the

INA103. This produces a –6dB/octave low frequency roll-

off like the capacitor input coupling in Figure 5.

COMMON-MODE INPUT RANGE

For proper operation, the combined differential input signal

and common-mode input voltage must not cause the input

amplifiers to exceed their output swing limits. The linear

input range is shown in the typical performance curve

“Maximum Common-Mode Voltage vs Output Voltage.”

For a given total gain, the input common-mode range can be

increased by reducing the input stage gain and increasing the

output stage gain with the circuit shown in Figure 7.

OUTPUT SENSE

An output sense terminal allows greater gain accuracy in

driving the load. By connecting the sense connection at the

load, I•R voltage loss to the load is included inside the

feedback loop. Current drive can be increased by connect-

ing a current booster inside the feedback loop as shown in

Figure 11.

FIGURE 6. Automatic DC Restoration.

FIGURE 4. Output Offsetting.

FIGURE 5. Input Offset Adjustment for AC-Coupled Inputs.

INA103

–In

+In

50k

Ω

(1)

50k

Ω (1)

100k

Ω (1)

OUT

Gain = 100V/V

(40dB)

NOTE: (1) 50k

R, 100k

pot is

max recommended value. Use

smaller values in this ratio if possible.

ΩΩ

–

≈ I

≈ 2.5µA

INA103

–In

+In

100k

Ω

(1)

OUT

–

100k

Ω (1)

10k

Ω

100k

Ω

1µF

Gain = 100V/V

(40dB)

NOTE: (1) 100k

is max recommended

value. Use smaller value if possible.

Ω

1/2 OPA1013

f–3dB =

Gain

π RC

INA103

150

Ω

–

150

Ω

10k

Ω

OPA27

100µA(1)

Offset Adjustment

Range = ±15mV

V–

VOUT

V+

NOTE: (1) 1/2 REF200

100µA(1)

∆VIN

Gain = 1V/V

(0dB)

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