LTC1417(RevA) 查看數據表（PDF） - Linear Technology

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LTC1417
(Rev.:RevA)

Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O

Linear Technology 

LTC1417

APPLICATIONS INFORMATION

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

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.

(SAMPLE N)

t2

CONVST

t3

CONVST 13

CONVST BUSY

RD

LTC1417

EXTCLKIN

SCLK

DOUT

14

BUSY (= RD)

12

6 EXTCLKIN ( = SCLK)

7

9

DOUT

µP OR DSP

t10

(SAMPLE N + 1)

t5

BUSY (= RD)

HOLD

SAMPLE

HOLD

tdEXTCLKIN

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

EXTCLKIN (= SCLK)

1

2

3

DOUT

t7

Hi-Z

D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

DATA (N – 1)

tCONV

FILL

ZEROS

t4

Hi-Z

D13

D13 D12 D11

DATA N

t8

1417 F18

EXTCLKIN

(= SCLK)

DOUT

tLEXTCLKIN

VIL

t11

t12

D13

tHEXTCLKIN

D12

VOH

D11

VOL

CAPTURE ON CAPTURE ON

RISING CLOCK FALLING CLOCK

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

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

20

sn1417 1417fas

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