LTC1594CS datasheet(15/24 Pages) LINER

15 / 24 page

LTC1594/LTC1598

15948fb

APPLICATIONS INFORMATION

BOARD LAYOUT CONSIDERATIONS

Grounding and Bypassing

The LTC1594/LTC1598 are easy to use if some care is

taken. They should be used with an analog ground plane

and single point grounding techniques. The GND pin

should be tied directly to the ground plane.

The VCC pin should be bypassed to the ground plane with

a 10

μFtantalumcapacitorwithleadsasshortaspossible.

If the power supply is clean, the LTC1594/LTC1598 can

also operate with smaller 1

μF or less surface mount or

ceramic bypass capacitors. All analog inputs should be

referenced directly to the single point ground. Digital

inputs and outputs should be shielded from and/or

routed away from the reference and analog circuitry.

SAMPLE-AND-HOLD

Both the LTC1594/LTC1598 provide a built-in sample-

and-hold (S&H) function to acquire signals through the

selected channel, assuming the ADCIN and MUXOUT

pins are tied together. The S & H of these parts acquire

input signals through the selected channel relative to

COM input during the tSMPL time (see Figure 7).

Single-Ended Inputs

The sample-and-hold of the LTC1594/LTC1598 allows

conversion of rapidly varying signals. The input voltage

is sampled during the tSMPL time as shown in Figure 7.

The sampling interval begins after tON time once the CS

is pulled low and continues until the second falling CLK

edge after the CS is low (see Figure 7). On this falling CLK

Figure 7. LTC1594/LTC1598 ADCIN and COM Input Settling Windows

CLK

DIN

DOUT

MUXOUT = ADCIN

CH0 TO CH7

SAMPLE

HOLD

“ANALOG” INPUT MUST

SETTLE DURING

THIS TIME

tSMPL

tON

tCONV

CSADC = CSMUX = CS

DON‘T CARE

1ST BIT TEST “COM” INPUT MUST

SETTLE DURING THIS TIME

B11

COM

1594/98 F07

LTC1594CS датащи(PDF) 15 Page - Linear Technology

LTC1594CS датащи(HTML) 15 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

датащи скачать

ссылки URL