TMP006B datasheet(24/38 Pages) TI

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cos

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

Object Temperature (

SC)

0°C-C

20°C-C

40°C-C

60°C-C

0°C-U

20°C-U

40°C-U

60°C-U

C015

0.00

0.05

0.10

0.15

0.20

0.25

Object Temperature (

SC)

0°C-C

20°C-C

40°C-C

60°C-C

0°C-U

20°C-U

40°C-U

60°C-U

C016

TMP006, TMP006B

SBOS518E – MAY 2011 – REVISED APRIL 2015

www.ti.com

9.2.1.3 Application Curves

Figure 20. Mean Calibration Error, Wide Range Over TDIE

Figure 21. Noise in Temperature Measurement, Wide

Range Over TDIE

9.3 System Examples

9.3.1 Use of NEP, NETD, and Responsivity in Estimating System Performance

It is often necessary to estimate system performance as part of the design process. A key system parameter is

temperature accuracy for a given set of parameters. Table 11 lists example parameters for estimating system

performance.

Table 11. Estimating System Performance Parameters

DESIGN PARAMETER

EXAMPLE VALUE

COMMENT

Object distance

10 mm

Distance to object

Object diameter

15 mm

Object size and geometry

0.95

Object emissivity

TDIE

23°C

Die temperature

TOBJ

30°C

Maximum expected object temperature

FOV

110°

Field of view subtended by object

Responsivity (R0)

10.8 V/W

Responsivity for TDIE = 25°C, θ = 0°

Responsivity (R)

9 V/W

Responsivity for 110° FOV

Sensor rms noise

0.20 µV

RMS sensor noise at TDIE = 25°C

NEP

30 nW

Thermal power equivalent to rms sensor noise

Conversion rate

1 SPS

SPS = samples per second

The system accuracy is a function of TOBJ, TDIE, ε, and radiation transfer.

The radiation transfer factor is system dependent, and is affected by the object distance and geometry (for

example, planar versus curved surfaces, or presence of lenses). For an planar object perpendicular to the

detector axis (see Figure 7), the radiation transfer follows the well-known sin2(

θ) result. This expression can be

used with a radiation transfer function responsivity value of 9 V/W to estimate system performance.

Because of the angular dependence of the TMP006 and TMP006B detector response, a more accurate

representation for the same radiative transfer function geometry is shown in Equation 13:

where

•

R0 is the responsivity of the detector to a point source at an angle normal to the detector (θ = 0 in Figure 7. R0

has a value of ~10.8 V/W at 25°C.

(13)

The responsivity value of 9 V/W is based on a system with a 110° FOV.

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