LTC1417IGN datasheet(20/32 Pages) LINER

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LTC1417

Using External Clock for Conversion and Data Transfer.

In Figure 18, data from the previous conversion is output

during the conversion with an external clock providing

both the conversion clock and the shift clock. To select an

external conversion clock, apply the clock to EXTCLKIN.

The same clock is also applied to SCLK to provide a data

APPLICATIONS INFORMATION

Figure 18. External Conversion Clock Selected. Data Transferred During Conversion Using

the External Clock (External Clock Drives Both EXTCLKIN and SCLK)

shift clock. To maintain conversion accuracy, the external

clock frequency must be between 50kHz and 9MHz.

Using an external clock to transfer data while an internal

clock controls the conversion process is not recom-

mended. As both signals are asynchronous, clock noise

can corrupt the conversion result.

D12

D11

D12

CAPTURE ON

RISING CLOCK

D13

D10

FILL

ZEROS

D13

D12

D11

Hi-Z

DATA N

DATA (N – 1)

(SAMPLE N)

(SAMPLE N + 1)

DOUT

EXTCLKIN (= SCLK)

CONVST

t10

tCONV

SAMPLE

HOLD

tdEXTCLKIN

1417 F18

BUSY (= RD)

t12

t11

tLEXTCLKIN

tHEXTCLKIN

EXTCLKIN

(= SCLK)

VIL

VOH

VOL

DOUT

CAPTURE ON

FALLING CLOCK

LTC1417

BUSY (= RD)

EXTCLKIN ( = SCLK)

BUSY

CONVST

EXTCLKIN

SCLK

DOUT

µP OR DSP

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