INA105AM datasheet(5/17 Pages) TI1

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INA105

COMMON-MODE INPUT RANGE vs SUPPLY

(Difference Amplifier Connected, V

OUT = 0)

Supply Voltage (V)

±3

±6

±9

±12

±15

±18

±21

Negative CMV

Positive CMV

POWER SUPPLY REJECTION

vs FREQUENCY

Frequency (Hz)

140

120

100

10k

100k

V–

V+

TYPICAL PERFORMANCE CURVES (CONT)

At TA = 25°C, VS = ±15V, unless otherwise noted.

APPLICATION INFORMATION

Figure 1 shows the basic connections required for operation

of the INA105. Power supply bypass capacitors should be

connected close to the device pins.

The differential input signal is connected to pins 2 and 3 as

shown. The source impedances connected to the inputs must

be nearly equal to assure good common-mode rejection. A

Ω mismatch in source impedance will degrade the com-

mon-mode rejection of a typical device to approximately

80dB. If the source has a known mismatch in source imped-

ance, an additional resistor in series with one input can be

used to preserve good common-mode rejection.

The output is referred to the output reference terminal (pin

1) which is normally grounded. A voltage applied to the Ref

terminal will be summed with the output signal. This can be

used to null offset voltage as shown in Figure 2. The source

impedance of a signal applied to the Ref terminal should be

less than 10

Ω to maintain good common-mode rejection.

Do not interchange pins 1 and 3 or pins 2 and 5, even though

nominal resistor values are equal. These resistors are laser

trimmed for precise resistor ratios to achieve accurate gain

and highest CMR. Interchanging these pins would not pro-

vide specified performance.

FIGURE 1. Basic Power Supply and Signal Connections.

INA105

OUT = V3 – V2

25k

Ω

25k

Ω

25k

Ω

25k

Ω

1µF

V–

1µF

V+

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