LTC1417IGN(RevA) Просмотр технического описания (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

TYPICAL APPLICATIONS

Figure 21 shows the connections necessary for interfacing

the LTC1417 and LTC1391 8-channel signal acquisition

system to an SPI port. With the sample software routine

shown in Listing A, the SPI uses MOSI to send serial data

to the LTC1391 8-channel multiplexer, selecting one of

eight MUX channels.

While data is sent to the LTC1391, SPI uses MISO to

retrieve conversion data from the LTC1417. After the data

transfer is complete, the conversion start signal is sent to

the LTC1417. The end of conversion is signaled by a logic

high on the BUSY output. When this occurs, data is

exchanged between the LTC1417/LTC1391 and the

controller.

The timing diagram in Figure 22 shows the relation be-

tween MUX channel selection data and the conversion

data that are simultaneously exchanged. There is a two

conversion delay between the MUX data selects a given

channel and when that channel’s data is retrieved.

5V

0.1µF

1

IN1

S0

V + 16

2

IN2

S1

15

D

LTC1391

3

IN3

S2

V – 14

4

IN4

S3

5

IN5

S4

6

IN6

S5

13

DOUT

NC

12

DIN

11

CS

7

IN7

S6

10

CLK

8

IN8

S7

9

DGND

5V

10µF

1µF

10µF

5V

NC

1 AIN+

VDD 16

2 AIN–

VSS 15

LTC1417

3 VREF

BUSY 14

4 REFCOMP CONVST 13

5 AGND

RD 12

6 EXTCLKIN

SHDN 11

7 SCLK

DGND 10

8 CLKOUT

DOUT 9

PORT C, BIT 7

PORT C, BIT 0

SS

MC68HC11

MISO

CLK

MOSI

1417 F21

Figure 21. 0V to 4.096V, 8-Channel Data Acquisition System Configured

for Control and Data Retrieval by a 68HC11 µC. Code is Shown in Listing A

sn1417 1417fas

23

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