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0.5 鈥?V

REF

**

0.5 鈥?V

REF

** 鈥?1LSB

0.25 鈥?V

REF

**

0.25 鈥?V

REF

** 鈥?1LSB

0

鈥?LSB

鈥?0.25 鈥?V

REF

**

鈥?0.25 鈥?V

REF

** 鈥?1LSB

鈥?0.5 鈥?V

REF

**

V

IN

* < 鈥?.5 鈥?V

REF

**

Bit 18

EOC

0

Bit 17

DMY

0

*The differential input voltage V

IN

= IN

+

鈥?IN

鈥?/div>

.

**The differential reference voltage V

REF

= REF

+

鈥?REF

鈥?/div>

.

鈥?0

鈥?5

NORMAL MODE REECTION RATIO (dB)

NORMAL MODE REJECTION (dB)

鈥?0

鈥?00

鈥?20

鈥?30

鈥?40

48

50

52

54

56

58

60

62

DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)

24361 F04

Figure 4. LTC2433-1 Normal Mode

Rejection When Using an Internal Oscillator

Simultaneous Frequency Rejection

The LTC2433-1 internal oscillator provides better than

87dB normal mode rejection over the range of 49Hz to

61.2Hz as shown in Figure 4. For this simultaneous 50Hz/

60Hz rejection, F

O

should be connected to GND.

When a fundamental rejection frequency different from

the range 49Hz to 61.2Hz is required or when the converter

must be sychronized with an outside source, the LTC2433-1

can operate with an external conversion clock. The conveter

automatically detects the presence of an external clock

signal at the F

O

pin and turns off the internal oscillator. The

frequency f

EOSC

of the external signal must be at least

U

Bit 16

SIG

1

0

Bit 15

MSB

1

0

1

0

Bit 14

0

1

0

1

0

1

Bit 13

0

1

0

1

0

1

0

1

0

1

Bit 12

0

1

0

1

0

1

0

1

0

1

鈥?/div>

Bit 0

0

1

0

1

0

1

0

1

0

1

鈥?0

鈥?5

鈥?00

鈥?05

鈥?10

鈥?15

鈥?20

鈥?25

鈥?30

鈥?35

鈥?40

鈥?2

鈥?

0

4

8

12

DIFFERENTIAL INPUT SIGNAL FREQUENCY

DEVIATION FROM NOTCH FREQUENCY f

EOSC

/2560(%)

24361 F05

W

U U

Figure 5. LTC2433-1 Normal Mode Rejection When

Using an External Oscillator of Frequency f

EOSC

2560Hz to be detected. The external clock signal duty cycle

is not significant as long as the minimum and maximum

specifications for the high and low periods, t

HEO

and t

LEO

,

are observed.

While operating with an external conversion clock of a

frequency f

EOSC

, the LTC2433-1 provides better than 110dB

normal mode rejection in a frequency range f

EOSC

/2560

卤4%.

The normal mode rejection as a function of the input

frequency deviation from f

EOSC

/2560 is shown in Figure 5.

Whenever an external clock is not present at the F

O

pin the

converter automatically activates its internal oscillator and

enters the Internal Conversion Clock mode. The LTC2433-1

24331fa

11

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