LTC1098ACN8 datasheet(28/32 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

10968fc

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.

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.

CLR

CLK

GND

VCC

LOAD

74C161

VIN

TO OSCILLOSCOPE

CLOCK IN 150kHz MAX

10968 F13

VCC

CLK

DOUT

VREF

LTC1096

CH0

CH1

GND

4.7μF

LTC1096

+IN

–IN

VREF

CLK

DOUT

VCC

GND

TO μP

63.4k

0.01μF

182k

0.01μF

LT1004-1.2

0.1μF

75k

678Ω

13.5k

LM134

10968 F15

VERTICAL: 5V/DIV

HORIZONTAL: 10μs/DIV

NULL

BIT

CLK

DOUT

MSB

(B7)

LSB

(B0)

LSB DATA

(B1)

10968 F14

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