LTC1594CS datasheet(12/24 Pages) LINER

12 / 24 page

LTC1594/LTC1598

15948fb

after a delay of tOFF, all the channels are switched off to

ensure a break-before-make interval. After this interval,

the selected channel is switched on allowing signal

transmission. The selected channel remains on until the

next falling edge of CS and the process repeats itself with

the “EN” bit being logic high. If the “EN” bit is logic low,

all the channels are switched off simultaneously after a

delay of tOFF from CS being pulled low and all the

channels remain off until the next falling edge of CS.

Input Data Word

When CS is high, the LTC1594/LTC1598 clock data into

the DIN inputs on the rising edge of the clock and store the

data into a 4-bit register. The input data words are defined

as follows:

CHANNEL SELECTION

1594/98 AI02

“EN” Bit

The first bit in the 4-bit register is an “EN” bit. If the “EN”

bit is a logic high, as illustrated in Figure 1, it enables the

selected channel after a delay of tON when the CS is pulled

low. If the “EN” bit is logic low, as illustrated in Figure 2,

it disables all channels after a delay of tOFF when the CS

is pulled low.

Multiplexer (MUX) Address

The 3 bits of input word following the “EN” bit select the

channel in the MUX for the requested conversion. For a

given channel selection, the converter will measure the

voltage of the selected channel with respect to the voltage

on the COM pin. Tables 1 and 2 show the various bit

combinations for the LTC1594/LTC1598 channel selection.

Table 1. Logic Table for the LTC1594 Channel Selection

CHANNEL STATUS

All Off

CH0

CH1

CH2

CH3

APPLICATIONS INFORMATION

Table 2. Logic Table for the LTC1598 Channel Selection

CHANNEL STATUS

All Off

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

Transfer Curve

The LTC1594/LTC1598 are permanently configured for

unipolar only. The input span and code assignment for

this conversion type is illustrated below.

Transfer Curve

VREF

4096

VIN

0 0 0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1 1 0

•

1594/98 • AI03

1LSB =

Output Code

OUTPUT CODE

•

1 1 1 1 1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1 1 1 1 0

0 0 0 0 0 0 0 0 0 0 0 0 0 1

0 0 0 0 0 0 0 0 0 0 0 0 0 0

INPUT VOLTAGE

VREF – 1LSB

VREF – 2LSB

•

1LSB

INPUT VOLTAGE

(VREF = 5.000V)

4.99878V

4.99756V

•

0.00122V

1594/98 • AI04

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