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LTC2413

sn2413 2413fs

APPLICATIO S I FOR ATIO

Figure 42. Measured Input Normal Mode Rejection vs Input

Frequency with Input Perturbation of 150% of Full Scale

INPUT FREQUENCY (Hz)

2413 F42

–20

–40

–60

–80

–100

–120

VCC = 5V

REF+ = 5V

REF – = GND

VINCM = 2.5V

TA = 25°C

VIN(P-P) = 5V

VIN(P-P) = 7.5V

(150% OF FULL SCALE)

100

120

140

160

180

200

220

range of 5V peak-to-peak. Figure 42 shows measurement

results for the LTC2413 normal mode rejection ratio with

a 7.5V peak-to-peak (150% of full scale) input signal su-

perimposed over the more traditional normal mode rejec-

tion ratio results obtained with a 5V peak-to-peak (full

scale) input signal. It is clear that the LTC2413 rejection

performance is maintained with no compromises in this

extreme situation. When operating with large input signal

levels, the user must observe that such signals do not

violate the device’s absolute maximum ratings.

BRIDGE APPLICATIONS

Typical strain gauge based bridges deliver only 2mV/Volt

of excitation. As the maximum reference voltage of the

LTC2413 is 5V, remote sensing of applied excitation

without additional circuitry requires that excitation be

limited to 5V. This gives only 10mV full scale, which can

be resolved to 1 part in 10000 without averaging. For many

solid state sensors, this is still better than the sensor. For

example, averaging 64 samples however reduces the

noise level by a factor of eight, bringing the resolving

power to 1 part in 80000, comparable to better weighing

systems. Hysteresis and creep effects in the load cells are

typically much greater than this. Most applications that

require strain measurements to this level of accuracy are

measuring slowly changing phenomena, hence the time

required to average a large number of readings is usually

not an issue. For those systems that require accurate

measurement of a small incremental change on a signifi-

cant tare weight, the lack of history effects in the LTC2400

family is of great benefit.

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