LTC1417IGN(RevA) Ver la hoja de datos (PDF) - Linear Technology

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LTC1417IGN
(Rev.:RevA)

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

Linear Technology 

LTC1417

APPLICATIONS INFORMATION

Serial Data Output After a Conversion

Using an Internal Conversion Clock and an External Data

Clock. In this mode, data is output after the end of each

conversion and before the next conversion is started

(Figure 19). The internal clock is used as the conversion

clock and an external clock is used for the SCLK. This

mode is useful in applications where the processor acts as

a serial bus master device. This mode is SPI and

MICROWIRETM compatible. It also allows operation when

the SCLK frequency is very low (less than 30kHz). To

select the internal conversion clock, tie EXTCLKIN high.

The external SCLK is applied to SCLK. RD can be used to

gate the external SCLK, such that data will clock only after

RD goes low and to three-state DOUT after data transfer. If

more than 16 SCLKs are provided, more zeros will be filled

in after the data word indefinitely.

MICROWIRE is a trademark of National Semiconductor Corporation.

13

CONVST

CONVST

14

BUSY

12

RD

LTC1417

7

SCLK

9

DOUT

INT

C0

µP OR DSP

SCK

MISO

EXTCLKIN = 5

t2

CONVST

t3

BUSY

HOLD

RD

SCLK

DOUT

(SAMPLE N)

Hi-Z

tCONV

t10

t6

t5

SAMPLE

t9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

t7

D13 12 11 10 9 8 7 6 5 4 3 2 1 0

DATA N

FILL

ZEROS

t8

Hi-Z

1417 F19

SCLK

DOUT

tLSCLK

VIL

t11

t12

D13

tHSCLK

D12

VOH

D11

VOL

CAPTURE ON CAPTURE ON

RISING CLOCK FALLING CLOCK

Figure 19. Internal Conversion Clock Selected. Data Transferred After Conversion

Using an External SCLK. BUSY↑ Indicates End of Conversion

sn1417 1417fas

21

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