LTC2414IGN datasheet(19/48 Pages) LINER

19 / 48 page

LTC2414/LTC2418

241418fa

Table 6. LTC2414/LTC2418 Interface Timing Modes

Conversion

Data

Connection

SCK

Cycle

Output

and

Configuration

Source

Control

Waveforms

External SCK, Single Cycle Conversion

External

CS and SCK

Figures 5, 6

External SCK, 3-Wire I/O

External

SCK

Figure 7

Internal SCK, Single Cycle Conversion

Internal

↓

Figures 8, 9

Internal SCK, 3-Wire I/O, Continuous Conversion

Internal

Continuous

Internal

Figure 10

last input bit A0 of SDI by the time CS pulled HIGH, the

address information is discarded and the previous

address is kept.

Finally, CS can be used to control the free-running modes

of operation, see Serial Interface Timing Modes section.

Grounding CS will force the ADC to continuously convert

at the maximum output rate selected by FO.

SERIAL INTERFACE TIMING MODES

The LTC2414/LTC2418’s 4-wire interface is SPI and

MICROWIRE compatible. This interface offers several

flexible modes of operation. These include internal/exter-

nal serial clock, 3- or 4-wire I/O, single cycle conversion.

The following sections describe each of these serial inter-

face timing modes in detail. In all these cases, the con-

verter can use the internal oscillator (FO = LOW or FO =

HIGH) or an external oscillator connected to the FO pin.

Refer to Table 6 for a summary.

External Serial Clock, Single Cycle Operation

(SPI/MICROWIRE Compatible)

This timing mode uses an external serial clock to shift out

the conversion result and a CS signal to monitor and

control the state of the conversion cycle, see Figure 5.

APPLICATIO S I FOR ATIO

Figure 5. External Serial Clock, Single Cycle Operation

EOC

BIT 31

SDO

SCK

(EXTERNAL)

(1)

(0)

SGL

ODD/

SIGN

SDI

DON’T CARE

TEST EOC

PARITY

MSB

SIG

BIT 0

LSB

BIT 6

BIT 27

BIT 26

BIT 25

BIT 24

BIT 28

BIT 29

BIT 30

SLEEP

DATA OUTPUT

CONVERSION

241418 F05

CONVERSION

Hi-Z

TEST EOC

VCC

REF+

REF–

CH0

CH7

CH8

CH15

COM

SCK

SDI

SDO

GND

919

REFERENCE

VOLTAGE

0.1V TO VCC

ANALOG

INPUTS

= 50Hz REJECTION

= EXTERNAL OSCILLATOR

= 60Hz REJECTION

VCC

µF

2.7V TO 5.5V

LTC2414/

LTC2418

4-WIRE

SPI INTERFACE

•

DON’T CARE

TEST EOC

(OPTIONAL)

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