LTC2410IGN datasheet(31/44 Pages) LINER

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LTC2410

APPLICATIO S I FOR ATIO

SYNCHRONIZATION OF MULTIPLE LTC2410s

Since the LTC2410’s absolute accuracy (total unadjusted

error) is 5ppm, applications utilizing multiple synchro-

nized ADCs are possible.

Simultaneous Sampling with Two LTC2410s

One such application is synchronizing multiple LTC2410s,

see Figure 44. The start of conversion is synchronized to

the rising edge of CS. In order to synchronize multiple

LTC2410s, CS is a common input to all the ADCs.

To prevent the converters from autostarting a new con-

version at the end of data output read, 31 or fewer SCK

clock signals are applied to the LTC2410 instead of 32 (the

32nd falling edge would start a conversion). The exact

timing and frequency for the SCK signal is not critical

since it is only shifting out the data. In this case, two

LTC2410’s simultaneously start and end their conversion

cycles under the external control of CS.

Increasing the Output Rate Using Mulitple LTC2410s

A second application uses multiple LTC2410s to increase

the effective output rate by 4

×, see Figure 45. In this case,

four LTC2410s are interleaved under the control of sepa-

rate CS signals. This increases the effective output rate

from 7.5Hz to 30Hz (up to a maximum of 60Hz). Addition-

ally, the one-shot output spectrum is unfolded allowing

further digital signal processing of the conversion results.

SCK and SDO may be common to all four LTC2410s. The

four CS rising edges equally divide one LTC2410 conver-

sion cycle (7.5Hz for 60Hz notch frequency). In order to

synchronize the start of conversion to CS, 31 or less SCK

clock pulses must be applied to each ADC.

Both the synchronous and 4

× output rate applications use

the external serial clock and single cycle operation with

reduced data output length (see Serial Interface Timing

Modes section and Figure 6). An external oscillator clock

is applied commonly to the FO pin of each LTC2410 in

order to synchronize the sampling times. Both circuits

may be extended to include more LTC2410s.

Figure 44. Synchronous Conversion—Extendable

31 OR LESS CLOCK CYCLES

SCK1

SCK2

2410 F44

SDO1

SDO2

31 OR LESS CLOCK CYCLES

LTC2410

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

SCK2

SCK1

SDO1

SDO2

LTC2410

VCC

REF+

REF –

IN+

IN –

GND

SCK

SDO

µCONTROLLER

EXTERNAL OSCILLATOR

(153,600HZ)

VREF+

VREF–

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