LTC1040CSW 查看數據表（PDF） - Linear Technology

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LTC1040CSW

Dual Micropower Comparator

Linear Technology 

LTC1040

TYPICAL APPLICATIO S

The LTC1040 as a Linear Amplifier

With a simple RC filter, the LTC1040 can be made to

function as a linear amplifier. By filtering the logic output

and feeding it back to the negative input, the loop forces

the output duty cycle [tON/(tON + tOFF)] so that VOUT equals

VIN (Figure 10).

The RC time constant is set to keep the ripple on the output

small. The maximum output ripple is: ∆V = V+/fSRC and

should be set to 0.5mV to 1mV for best results. Notice that

the higher the sampling frequency, fS, the lower RC can be.

This is important because the RC filter also sets the loop

response. A convenient way to keep fS as high as possible

under all conditions is to connect a 100k resistor to pin 16

(OSC) with no capacitance to ground.

V+

+

–

R

VIN

+1/2 LTC1040

VOUT

–

C

LTC1040 • TA07

V+

0V

tOFF

tON

Figure 10. The LTC1040 as a Linear Amplifier

VOUT

=

V+

tON

tON + tOFF

LTC1040 • TA08

2-Wire 0°C to 100°C Temperature Transducer with 4mA to 20mA Output

V+

R

LM134

12V TO 40V

0°C = 4mA

100°C = 20mA

V–

43

1N914

430Ω

LT1019-5

1k

3200

6

6250

ZERO

ADJUST 100k

16

6–

5 + 1/2

18

4

1M

4

†

†

7

8

– LTC1040

+

9

+

2N6657

18k

10

1µF

50Ω

† YELLOW SPRINGS INSTRUMENT

PART NO. 44201

+

10µF

5k

FULL-SCALE

ADJUST

182Ω

RETURN

ACCURACY =

±0.1°C + ±0.2°C = ±0.3°C

CIRCUIT ERROR TRANSDUCER

AT 25°C

ERROR

LTC1040 • TA09

1040fa

10

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