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LTC1594LIS

4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters

Linear Technology 

LTC1594L/LTC1598L

APPLICATIONS INFORMATION

BOARD LAYOUT CONSIDERATIONS

Grounding and Bypassing

The LTC1594L/LTC1598L 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 10µF tantalum capacitor with leads as short as possible.

If the power supply is clean, the LTC1594L/LTC1598L

can also operate with smaller 1µF 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 LTC1594L/LTC1598L 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 LTC1594L/LTC1598L 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

CSADC = CSMUX = CS

SAMPLE

HOLD

“ANALOG” INPUT MUST

tON

SETTLE DURING

THIS TIME

tSMPL

tCONV

CLK

DIN

EN

D2

D1

D0

DON‘T CARE

DOUT

MUXOUT = ADCIN

B11

1ST BIT TEST “COM” INPUT MUST

SETTLE DURING THIS TIME

CH0 TO CH7

COM

Figure 7. LTC1594L/LTC1598L ADCIN and COM Input Settling Windows

1594L/98L F07

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