+

±

+

±

2.5 V

300 Ÿ

10 µF

2.5 V

TLV6003

TLV6003

VREF

2 Ÿ

2 Ÿ

300 Ÿ

260 mF

130 mF

0 - 20 µA

110 NŸ

10 Ÿ

10 NŸ

10 NŸ

WE

RE

CE

CO Sensor

Model

VTIA

ISENS

VCE

VREF

16

TLV6003

SLOS981 – OCTOBER 2019

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Typical Application (continued)

8.2.1 Design Requirements

For this example, an electrical model of a CO sensor is used to simulate the sensor performance, as shown in

Figure 33. The simulation is designed to model a CO sensor with a sensitivity of 69 nA/ppm. The supply voltage

and maximum ADC input voltage is 2.5 V, and the maximum concentration is 300 ppm.

Figure 33. CO Sensor Simulation Schematic

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Supply voltage

2.5 V

Amplifier quiescent current

< 2 µA

Transimpedance amplifier

sensitivity

110 mV/µA