INA103 datasheet(8/24 Pages) TI2

8 / 24 page

INA103

TYPICAL PERFORMANCE CURVES (CONT)

At T

A = +25°C, VS = ±15V unless, otherwise noted.

APPLICATIONS INFORMATION

Figure 1 shows the basic connections required for operation.

Power supplies should be bypassed with 1

µF tantalum

capacitors near the device pins. The output Sense (pin 11)

and output Reference (pin 7) should be low impedance

connections. Resistance of a few ohms in series with these

connections will degrade the common-mode rejection of the

amplifier.

To avoid oscillations, make short, direct connection to the

gain set resistor and gain sense connections. Avoid running

output signals near these sensitive input nodes.

INPUT CONSIDERATIONS

Certain source impedances can cause the INA103 to oscil-

late. This depends on circuit layout and source or cable

characteristics connected to the input. An input network

consisting of a small inductor and resistor (Figure 2) can

greatly reduce the tendancy to oscillate. This is especially

useful if various input sources are connected to the INA103.

Although not shown in other figures, this network can be

used, if needed, with all applications shown.

GAIN SELECTION

Gains of 1 or 100V/V can be set without external resistors.

For G = 1V/V (unity gain) leave pin 14 open (no connec-

tion)—see Figure 4. For G = 100V/V, connect pin 14 to pin

6—see Figure 5.

Gain can also be accurately set with a single external resistor

as shown in Figure 1. The two internal feedback resistors are

laser-trimmed to 3k

Ω within approximately ±0.1%. The

temperature coefficient of these resistors is approximately

50ppm/˚C. Gain using an external R

G resistor is—

G = 1 +

Ω

0.1

0.010

0.001

SMPTE IMD vs FREQUENCY

Frequency (Hz)

10k

20k

0.0005

G = 1000

G = 100

G = 1

G = 10

CURRENT NOISE SPECTRAL DENSITY

100

10k

Frequency (Hz)

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