LTC2410IGN datasheet(33/48 Pages) LINER

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LTC2410

APPLICATIO S I FOR ATIO

Figure 39. Input Normal Mode Rejection

Figure 40. Input Normal Mode Rejection

Figure 41. Input Normal Mode Rejection vs Input Frequency

with Input Perturbation of 100% Full Scale (60Hz Notch)

Figure 42. Input Normal Mode Rejection vs Input Frequency

with Input Perturbation of 100% Full Scale (50Hz Notch)

INPUT SIGNAL FREQUENCY (Hz)

2410 F39

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

2fN 3fN 4fN 5fN 6fN 7fN 8fN

INPUT SIGNAL FREQUENCY (Hz)

250fN 252fN 254fN 256fN 258fN 260fN 262fN

2410 F40

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

INPUT FREQUENCY (Hz)

105 120 135 150 165 180 195 210 225 240

2410 F41

–20

–40

–60

–80

–100

–120

VCC = 5V

REF+ = 5V

REF – = GND

VINCM = 2.5V

VIN(P-P) = 5V

FO = GND

TA = 25°C

MEASURED DATA

CALCULATED DATA

INPUT FREQUENCY (Hz)

12.5

37.5

62.5

87.5 100 112.5 125 137.5 150 162.5 175 187.5 200

2410 F42

–20

–40

–60

–80

–100

–120

VCC = 5V

REF+ = 5V

REF – = GND

VINCM = 2.5V

VIN(P-P) = 5V

FO = 5V

TA = 25°C

MEASURED DATA

CALCULATED DATA

The combined normal mode rejection performance is

shown in Figure 37 for the internal oscillator with 50Hz

notch setting (FO = HIGH) and in Figure 38 for the internal

oscillator with 60Hz notch setting (FO = LOW) and for the

external oscillator mode. The regions of low rejection

occurring at integer multiples of fS have a very narrow

bandwidth. Magnified details of the normal mode rejection

curves are shown in Figure 39 (rejection near DC) and

Figure 40 (rejection at fS = 256fN) where fN represents the

notch frequency. These curves have been derived for the

external oscillator mode but they can be used in all

operating modes by appropriately selecting the fN value.

The user can expect to achieve in practice this level of

performance using the internal oscillator as it is demon-

strated by Figures 41 and 42. Typical measured values of

the normal mode rejection of the LTC2410 operating with

an internal oscillator and a 60Hz notch setting are shown

in Figure 41 superimposed over the theoretical calculated

curve. Similarly, typical measured values of the normal

mode rejection of the LTC2410 operating with an internal

oscillator and a 50Hz notch setting are shown in Figure 42

superimposed over the theoretical calculated curve.

As a result of these remarkable normal mode specifica-

tions, minimal (if any) antialias filtering is required in front

of the LTC2410. If passive RC components are placed in

front of the LTC2410, the input dynamic current should be

considered (see Input Current section). In cases where

large effective RC time constants are used, an external

buffer amplifier may be required to minimize the effects of

dynamic input current.

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