LTC2415-1IGN datasheet(17/40 Pages) LINER

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LTC2415/LTC2415-1

sn2415 24151fs

APPLICATIO S I FOR ATIO

Table 3a. LTC2415 State Duration

State

Operating Mode

Duration

CONVERT

Internal Oscillator

FO = LOW, (60Hz Rejection)

66.6ms, 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 Until CS = LOW and SCK

DATA OUTPUT

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

As Long As CS = LOW But Not Longer Than 1.67ms (32 SCK cycles)

FO = External Oscillator with

As Long As CS = LOW But Not Longer Than 256/fEOSCms (32 SCK cycles)

Frequency fEOSC kHz

External Serial Clock with Frequency fSCK kHz

As Long As CS = LOW But Not Longer Than 32/fSCKms (32 SCK cycles)

INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%)

–12

–8

–4

048

2415 F07a

–60

–70

–80

–90

–100

–110

–120

–130

–140

Table 3b. LTC2415-1 State Duration

State

Operating Mode

Duration

CONVERT

Internal Oscillator

FO = LOW

72.8ms, 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 Until CS = LOW and SCK

DATA OUTPUT

Internal Serial Clock FO = LOW (Internal Oscillator)

As Long As CS = LOW But Not Longer Than 1.83ms (32 SCK cycles)

FO = External Oscillator with

As Long As CS = LOW But Not Longer Than 256/fEOSCms (32 SCK cycles)

Frequency fEOSC kHz

External Serial Clock with Frequency fSCK kHz

As Long As CS = LOW But Not Longer Than 32/fSCKms (32 SCK cycles)

Figure 7c. LTC2415/LTC2415-1

Normal Mode Rejection When Using

an External Oscillator of Frequency

fEOSC with Running Averages

Figure 7b. LTC2415-1 Normal Mode

Rejection When Using an Internal

Oscillator with Running Averages

DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)

2415 F07b

–80

–90

–100

–120

–130

–140

DIFFERENTIAL INPUT SIGNAL FREQUENCY

DEVIATION FROM NOTCH FREQUENCY fEOSC/2560(%)

–12

–8

–4

048

2415 F07c

–80

–85

–90

–95

–100

–105

–110

–115

–120

–125

–130

–135

–140

Figure 7a. LTC2415/LTC2415-1 Normal Mode

Rejection When Using an External Oscillator

of Frequency fEOSC without Running Averages

state and the converter is in the Internal SCK mode, the

serial clock duty cycle may be affected but the serial data

stream will remain valid.

Table 3b summarizes the duration of each state and the

achievable output data rate as a function of FO.

Serial Interface Pins

The LTC2415/LTC2415-1 transmit the conversion results

and receive the start of conversion command through a

synchronous 3-wire interface. During the conversion and

sleep states, this interface can be used to assess the

converter status and during the data output state it is used

to read the conversion result.

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