LTC1283CS datasheet(13/24 Pages) LINER

13 / 24 page

LTC1283

APPLICATI

I FOR ATIO

Figure 3. CS High During Conversion

Figure 4. CS Low During Conversion

Serial Port Microprocessors

Most synchronous serial formats contain a shift clock

(SCLK) and two data lines, one for transmitting and one for

receiving. In most cases data bits are transmitted on the

falling edge of the clock (SCLK) and captured on the rising

edge. However, serial port formats vary among MPU

manufacturers as to the smallest number of bits that can

be sent in one group (e.g., 4-bit, 8-bit or 16-bit transfers).

They also vary as to the order in which the bits are

transmitted (LSB- or MSB-first). The following examples

show how the LTC1283 accommodates these differences.

National MICROWIRE (COP820C)

The COP820C transfers data MSB-first and in 8-bit incre-

ments. This is easily accommodated by setting the LTC1283

to MSB-first format and 10-bit word length. The data

output word is then received by the COP820C in one 8-bit

block and one 2-bit block.

Table 2. 3V Microprocessor with Hardware Serial Interfaces

Compatible with the LTC1283*

PART NUMBER

TYPE OF INTERFACE

Motorola

MC68HC11

SPI

MC68HC05

SPI

RCA

CDP68HC05

SPI

National Semiconductor

COP800 Family

MICROWIRE/PLUS

†

HPC16000 Family

MICROWIRE/PLUS

†

Texas Instruments

TMS70C02

Serial Port

TMS70C42

Serial Port

*Contact factory for interface information for processors not on this list

†MICROWIRE/PLUS is a trademark of National Semiconductor Corp.

SHIFT RESULT OUT

AND NEW ADDRESS IN

SCLK

DOUT

DIN

tSMPL

SAMPLE ANALOG

INPUT

SHIFT

MUX ADDRESS

LTC1283 • F03

40 TO 44

ACLK CYCLES

ODD/

SIGN

SEL

UNI MSBF WL1 WL0

DON’T CARE

SGL/

DIFF

ODD/

SIGN

SEL

UNI MSBF WL1 WL0

SGL/

DIFF

SHIFT RESULT OUT

AND NEW ADDRESS IN

SCLK

DOUT

DIN

tSMPL

SAMPLE ANALOG

INPUT

SHIFT

MUX ADDRESS

LTC1283 • F04

40 TO 44

ACLK CYCLES

ODD/

SIGN

SEL

UNI MSBF WL1 WL0

DON’T CARE

SGL/

DIFF

ODD/

SIGN

SEL

UNI MSBF WL1 WL0

SGL/

DIFF

SCLK MUST REMAIN LOW

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