LTC2435IGN datasheet(16/40 Pages) LINER

部件名	LTC2435IGN

功能描述	20-Bit No Latency ADCs with Differential Input and Differential Reference

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制造商	LINER [Linear Technology]

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LTC2435/LTC2435-1

16

24351fa

APPLICATIO S I FOR ATIO

The LTC2435 internal oscillator provides better than 110dB

normal mode rejection at the line frequency and its harmon-

ics for 50Hz ±2% or 60Hz ±2%. For 60Hz rejection, FO

should be connected to GND while for 50Hz rejection the FO

pin should be connected to VCC.

The selection of 50Hz or 60Hz rejection can also be made by

driving FO to an appropriate logic level. A selection change

during the sleep or data output states will not disturb the

converter operation. If the selection is made during the

conversion state, the result of the conversion in progress

may be outside specifications but the following conver-

sions will not be affected.

When a fundamental rejection frequency different from

50Hz or 60Hz is required or when the converter must be

synchronized with an outside source, the LTC2435 can

operate with an external conversion clock. The converter

automatically detects the presence of an external clock

signal at the FO pin and turns off the internal oscillator. The

frequency fEOSC of the external signal must be at least 5kHz

to be detected. The external clock signal duty cycle is not

significant as long as the minimum and maximum specifi-

cations for the high and low periods tHEO and tLEO are

observed.

While operating with an external conversion clock of a

frequency fEOSC, the LTC2435 provides better than 110dB

normal mode rejection in a frequency range fEOSC/2560

±4% and its harmonics. The normal mode rejection as a

function of the input frequency deviation from fEOSC/2560

is shown in Figure 7a.

Whenever an external clock is not present at the FO pin, the

converter automatically activates its internal oscillator and

enters the Internal Conversion Clock mode. The LTC2435

operation will not be disturbed if the change of conversion

clock source occurs during the sleep state or during the

data output state while the converter uses an external serial

clock. If the change occurs during the conversion state, the

result of the conversion in progress may be outside speci-

fications but the following conversions will not be affected.

If the change occurs during the data output 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 3a summarizes the duration of each state and the

achievable output data rate as a function of FO.

Frequency Rejection Selection LTC2435-1 (FO)

The LTC2435-1 internal oscillator provides better than

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

61.2Hz as shown in Figure 7b. For simultaneous 50Hz/60Hz

rejection, FO should be connected to GND.

In order to achieve 87dB normal mode rejection of 50Hz

±2% and 60Hz ±2%, two consecutive conversions must be

averaged. By performing a continuous running average of

the two most current results, both simultaneous rejection

is achieved and a nearly 2× increase in throughput is

realized relative to the LTC2430 (see Normal Mode Rejec-

tion, Ouput Rate and Running Averages sections of this

data sheet).

When a fundamental rejection frequency different from

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

must be synchronized with an outside source, the

LTC2435-1 can operate with an external conversion clock.

The performance of the LTC2435-1 is the same as the

LTC2435 when driven by an external conversion clock at

the FO pin.

Table 3b summarizes the duration of each state and the

achievable output data rate as a function of FO.

Serial Interface Pins

The LTC2435/LTC2435-1 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.

类似零件编号 - LTC2435IGN

制造商	部件名	数据表	功能描述
Linear Technology	LTC2435	645Kb / 42P	20-Bit No Latency ADCs with Differential Input and Differential Reference
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LTC2435IGN 数据表(PDF) 16 Page - Linear Technology

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LTC2435IGN 数据表(PDF) 16 Page - Linear Technology

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