LTC1197CS8 datasheet(24/28 Pages) LINER

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LTC1197/LTC1197L

LTC1199/LTC1199L

APPLICATI

TYPICAL

A “Quick Look” Circuit for the LTC1197

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

the LTC1197 by using the following simple circuit (Figure

11). VREF is tied to VCC. VIN is applied to the +IN input and

the – IN input is tied to the ground. CS is driven at 1/16

the clock rate by the 74HC161 and DOUT outputs the data.

The output data from the DOUT pin can be viewed on an

oscilloscope that is set up to trigger on the falling edge

of CS (Figure 12). Note that after the LSB is clocked out,

the LTC1197 clocks out zeros until CS goes high. Also

note that with the resistor divider on DOUT the output

goes midway between VCC and ground when in the high

impedance mode.

CLR

CLK

GND

VCC

LOAD

74HC161

VIN

TO OSCILLOSCOPE

DOUT CLK CS

1197/99 F11

VCC

CLK

DOUT

VREF

LTC1197

+ IN

– IN

GND

µF

10k

CLK IN 7.2MHz MAX

10k

Figure 11. “Quick Look” Circuit for the LTC1197

CLK

OUT

FILL

ZEROES

HIGH

IMPEDANCE

2 NULL

BITS

MSB

(B9)

LSB

(B0)

VERTICAL: 5V/DIV

HORIZONTAL: 10

µs/DIV

Figure 12. Scope Photo of the LTC1197 “Quick Look” Circuit

Waveforms Showing A/D Output 1001001001 (249HEX)

LTC1197CS8 Datasheet(PDF) 24 Page - Linear Technology

LTC1197CS8 Datasheet(HTML) 24 Page - Linear Technology

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