LTC1417IGN datasheet(27/32 Pages) LINER

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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.

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

1417 F23

µF

LTC1417

– 5V

PORT C, BIT 7

PORT C, BIT 6

PORT C, BIT 2

PORT C, BIT 1

PORT C, BIT 0

MISO

CLK

AIN

–

VREF

REFCOMP

AGND

EXTCLKIN

SCLK

CLKOUT

VDD

VSS

BUSY

CONVST

SHDN

DGND

DOUT

DG408

V +

V –

GND

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

0.1

µF

0.1

µF

MC68HC11

LTC1417IGN Datasheet(PDF) 27 Page - Linear Technology

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