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LTC1290

1290fe

A “Quick Look” Circuit for the LTC1290

Users can get a quick look at the function and timing of the

LTC1290 by using the following simple circuit. REF+ and

DIN are tied to VCC selecting a 5V input span, CH7 as a

single-ended input, unipolar mode, MSB-first format and

16-bit word length. ACLK and SCLK are tied together and

driven by an external clock. CS is driven at 1/128 the clock

rate by the CD4520 and DOUT outputs the data. All other

pins are tied to a ground plane. The output data from the

DOUT pin can be viewed on an oscilloscope which is set up

to trigger on the falling edge of CS.

APPLICATI

TYPICAL

A “Quick Look” Circuit for the LTC1290

1290 TA02

LTC1290

0.1

µF

CHO

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

DGND

VIN

OSCILLOSCOPE

CD4520

CLK

RESET

VSS

VDD

RESET

CLK

CLOCK IN

2MHz MAX

VCC

ACLK

SCLK

DIN

DOUT

REF+

REF–

V–

AGND

f/128

Scope Trace of LTC1290 “Quick Look” Circuit

Showing A/D Output of 010101010101 (555HEX)

OUT

ACLK/

SCLK

MSB

(B11)

DEGLITCHER

TIME

LSB

(B0)

FILLS

ZEROS

VERTICAL: 5V/DIV

HORIZONTAL: 1

µs/DIV

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