LTC2435-1IGN datasheet(17/40 Pages) LINER

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LTC2435/LTC2435-1

24351fa

APPLICATIO S I FOR ATIO

Table 3a. LTC2435 State Duration

State

Operating Mode

Duration

CONVERT

Internal Oscillator

FO = LOW, (60Hz Rejection)

67ms, Output Data Rate ≤ 15 Readings/s

FO = HIGH, (50Hz Rejection)

80ms, Output Data Rate ≤ 12.4 Readings/s

External Oscillator

FO = External Oscillator with Frequency 10278/fEOSCs, Output Data Rate ≤ fEOSC/10278 Readings/s

fEOSC kHz (fEOSC/2560 Rejection)

SLEEP

As Long As CS = HIGH

DATA OUTPUT

Internal Serial Clock FO = LOW/HIGH, (Internal Oscillator)

As Long As CS = LOW But Not Longer Than 1.25ms (24 SCK cycles)

FO = External Oscillator with

As Long As CS = LOW But Not Longer Than 192/fEOSCms (24 SCK cycles)

Frequency fEOSC kHz

External Serial Clock with Frequency fSCK kHz

As Long As CS = LOW But Not Longer Than 24/fSCKms (24 SCK cycles)

INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%)

–12

–8

–4

048

2435 F07a

–60

–70

–80

–90

–100

–110

–120

–130

–140

Table 3b. LTC2435-1 State Duration

State

Operating Mode

Duration

CONVERT

Internal Oscillator

FO = LOW

73ms, Output Data Rate ≤ 14 Readings/s

Simultaneous 50Hz/60Hz Rejection

External Oscillator

FO = External Oscillator with Frequency 10278/fEOSCs, Output Data Rate ≤ fEOSC/10278 Readings/s

fEOSC kHz (fEOSC/2560 Rejection)

SLEEP

As Long As CS = HIGH

DATA OUTPUT

Internal Serial Clock FO = LOW (Internal Oscillator)

As Long As CS = LOW But Not Longer Than 1.4ms (24 SCK cycles)

FO = External Oscillator with

As Long As CS = LOW But Not Longer Than 192/fEOSCms (24 SCK cycles)

Frequency fEOSC kHz

External Serial Clock with Frequency fSCK kHz

As Long As CS = LOW But Not Longer Than 24/fSCKms (24 SCK cycles)

Figure 7c. LTC2435/LTC2435-1

Normal Mode Rejection When Using

an External Oscillator of Frequency

fEOSC with Running Averages

Figure 7b. LTC2435-1 Normal Mode

Rejection When Using an Internal

Oscillator with Running Averages

DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)

2435 F07b

–80

–90

–100

–120

–130

–140

DIFFERENTIAL INPUT SIGNAL FREQUENCY

DEVIATION FROM NOTCH FREQUENCY fEOSC/2560(%)

–12

–8

–4

2435 F07c

–80

–85

–90

–95

–100

–105

–110

–115

–120

–125

–130

–135

–140

Figure 7a. LTC2435/LTC2435-1 Normal Mode

Rejection When Using an External Oscillator

of Frequency fEOSC without Running Averages

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