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 23 uses the DG408 to select one of eight ±2.048V

bipolar signals and apply it to the LTC1417’s analog input.

The circuit is designed to connect to a 68HC11 µC. The

MUX’s parallel input is connected to the controller’s port

C and the LTC1417’s serial interface is accessed through

the controller’s SPI interface.

The sequence to generate a conversion is shown in sample

program Listing B. The first step selects a MUX channel.

This is followed by initiating a conversion and waiting for

BUSY to go high, signifying end of conversion. Once BUSY

goes low, the SPI is used to retrieve the 14-bit conversion

data. The timing relationships between the various control

signals and data transmission are shown in Figure 24.

5V

– 5V

5V

– 5V

1

IN1

S1

2

IN2

S2

3

IN3

S3

4

IN4

S4

5

IN5

S5

6

IN6

S6

7

IN7

S7

8

IN8

S8

0.1µF

V + 13

DG408

V– 3

14

GND

2

EN

A2

A1

A0

D

0.1µF

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 6

SS

MISO

MC68HC11

CLK

PORT C, BIT 2

PORT C, BIT 1

PORT C, BIT 0

1417 F23

Figure 23. With an Input Range of ±2.048V for Each of Eight Inputs,

This Data Acquisition System is Configured for Communication with the 68HC11 µC

sn1417 1417fas

27

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