LTC2410IGN datasheet(32/44 Pages) LINER

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LTC2410

APPLICATIO S I FOR ATIO

BRIDGE APPLICATIONS

Typical strain gauge based bridges deliver only 2mV/Volt

of excitation. As the maximum reference voltage of the

LTC2410 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.

For those applications that cannot be fulfilled by the

LTC2410 alone, compensating for error in external ampli-

fication can be done effectively due to the “no latency”

feature of the LTC2410. No latency operation allows

samples of the amplifier offset and gain to be interleaved

with weighing measurements. The use of correlated double

sampling allows suppression of 1/f noise, offset and

thermocouple effects within the bridge. Correlated double

sampling involves alternating the polarity of excitation and

dealing with the reversal of input polarity mathematically.

Alternatively, bridge excitation can be increased to as

much as

±10V, if one of several precision attenuation

Figure 45. Actual Frequency Rate LTC2410 System

CS1

CS2

CS3

2410 F45

CS4

SCK

31 OR LESS

CLOCK PULSES

SDO

LTC2410

SCK

SDO

CS1

CS2

CS3

CS4

LTC2410

µCONTROLLER

EXTERNAL OSCILLATOR

(153,600HZ)

VREF+

VREF–

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

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