LTC2483CDD datasheet(22/32 Pages) LINER

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LTC2483

2483f

Output Data Rate

When using its internal oscillator, the LTC2483 produces

up to 6.82sps with simultaneous 50Hz/60Hz rejection. The

actual output data rate will depend upon the length of the

sleep and data output phases which are controlled by the

user and which can be made insignificantly short. When

operated with an external conversion clock (CA0/F0 con-

nected to an external oscillator), the LTC2483 output data

rate can be increased as desired. The duration of the

conversion phase is 41036/fEOSC. If fEOSC = 307.2kHz, the

converter notch is set at 60Hz.

An increase in fEOSC over the nominal 307.2kHz will

translate into a proportional increase in the maximum

APPLICATIO S I FOR ATIO

output data rate. The increase in output rate is neverthe-

less accompanied by three potential effects, which must

be carefully considered.

First, a change in fEOSC will result in a proportional change

in the internal notch position and in a reduction of the

converter differential mode rejection at the power line

frequency. In many applications, the subsequent perfor-

mance degradation can be substantially reduced by relying

upon the LTC2483’s exceptional common mode rejection

and by carefully eliminating common mode to differential

mode conversion sources in the input circuit. The user

should avoid single-ended input filters and should main-

tain a very high degree of matching and symmetry in the

circuits driving the IN+ and IN– pins.

OUTPUT DATA RATE (READINGS/SEC)

–10

2483 F16

100

030

VIN(CM) = VREF(CM)

VCC = VREF = 5V

VIN = 0V

CA0/F0 = EXT CLOCK

TA = 85°C

TA = 25°C

OUTPUT DATA RATE (READINGS/SEC)

500

1500

2000

2500

3500

2483 F17

1000

3000

90 100

20 30

VIN(CM) = VREF(CM)

VCC = VREF = 5V

CA0/F0 = EXT CLOCK

TA = 85°C

TA = 25°C

Figure 16. Offset Error vs Output Data Rate and Temperature

Figure 17. +FS Error vs Output Data Rate and Temperature

OUTPUT DATA RATE (READINGS/SEC)

–3500

–3000

–2000

–1500

–1000

2483 F18

–2500

–500

90 100

20 30

VIN(CM) = VREF(CM)

VCC = VREF = 5V

CA0/F0 = EXT CLOCK

TA = 85°C

TA = 25°C

Figure 18. –FS Error vs Output Data Rate and Temperature

OUTPUT DATA RATE (READINGS/SEC)

2483 F19

90 100

20 30

VIN(CM) = VREF(CM)

VCC = VREF = 5V

VIN = 0V

CA0/F0 = EXT CLOCK

RES = LOG 2 (VREF/NOISERMS)

TA = 85°C

TA = 25°C

Figure 19. Resolution (NoiseRMS ≤ 1LSB)

vs Output Data Rate and Temperature

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