LTC1098AC datasheet(25/28 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

APPLICATI

TYPICAL

A “Quick Look” Circuit for the LTC1096

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

LT1096 by using the following simple circuit (Figure 13).

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 74C161 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 14). Note the LSB data is partially clocked out

before CS goes high.

CLR

CLK

GND

VCC

LOAD

74C161

VIN

TO OSCILLOSCOPE

CLOCK IN 150kHz MAX

LTC1096/8 • F13

VCC

CLK

DOUT

VREF

LTC1096

CH0

CH1

GND

4.7

µF

MSB

(B7)

NULL

BIT

LSB

(B0)

LSB DATA

(B1)

CLK

OUT

VERTICAL: 5V/DIV

HORIZONTAL: 10

µs/DIV

LTC1096

+IN

–IN

VREF

CLK

DOUT

VCC

GND

µP

63.4k

0.01

µF

182k

0.01

µF

LT1004-1.2

0.1

µF

75k

678

Ω

13.5k

LM134

LTC1096/8 • F15

Figure 15. The LTC1096’s High Impedance Input Connects

Directly to This Temperature Sensor, Eliminating Signal

Conditioning Circuitry in This 0

°C to 70°C Thermometer

Figure 14. Scope Trace the LTC1096 “Quick Look” Circuit

Showing A/D Output 10101010 (AAHEX)

Figure 13. “Quick Look” Circuit for the LTC1096

Figure 15 shows a temperature measurement system.

The LTC1096 is connected directly to the low cost silicon

temperature sensor. The voltage applied to the VREF pin

adjusts the full scale of the A/D to the output range of the

sensor. The zero point of the converter is matched to the

zero output voltage of the sensor by the voltage on the

LTC1096’s negative input.

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