TLV7031 datasheet(23/69 Pages) TI2

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7.2.1.3 Application Curve

VTH+ = 2.2 V

VIN

VOUT

VTH± = 1.1 V

Time (usec)

100

150

200

Figure 7-4. Window Comparator Results

7.2.2 IR Receiver Analog Front End

A single TLV703x device can be used to build a complete IR receiver analog front end (AFE). The nanoamp

quiescent current and low input bias current make possible powereing the circuit with a coin cell battery, which

can last for years.

10M

470 k

0.01 F

3 V

GND

TLV7031

Output to MCU

(Also to wake-up MCU)

IR LED

Vref

VOUT

VIN

Figure 7-5. IR Receiver Analog Front End Using TLV703x

7.2.2.1 Design Requirements

For this design, follow these design requirements:

• Use a proper resistor (R1) value to generate an adequate signal amplitude applied to the inverting input of the

comparator.

• The low input bias current IB (2pA typical) allows a greater value of R1 to be used.

• The RC constant value (R2 and C1) must support the targeted data rate (that is, 9,600 bauds) to maintain a

valid tripping threshold.

• The hysteresis introduced with R3 and R4 helps to avoid spurious output toggles.

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TLV7031, TLV7032, TLV7041, TLV7042, TLV7034, TLV7044

SLVSE13J – SEPTEMBER 2017 – REVISED NOVEMBER 2024

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TLV7031 Datasheet(PDF) 23 Page - Texas Instruments