TSC102 datasheet(12/24 Pages) STMICROELECTRONICS

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Parameter definitions

TSC102

12/24

Doc ID 16754 Rev 2

Parameter definitions

6.1

Common-mode rejection ratio (CMR)

The common-mode rejection ratio (CMR) measures the ability of the current sensing

amplifier to reject any DC voltage applied on both inputs Vp and Vm. The CMR is referred

back to the input so that its effect can be compared with the applied differential signal. The

CMR is defined by the formula:

6.2

Supply voltage rejection ratio (SVR)

The supply voltage rejection ratio (SVR) measures the ability of the current sensing amplifier

to reject any variation of the supply voltage VCC. The SVR is referred back to the input so

that its effect can be compared with the applied differential signal. The SVR is defined by the

formula:

6.3

Gain (Av) and input offset voltage (Vos)

The input offset voltage is defined as the intersection between the linear regression of the

Va1 versus Vsense curve with the X-axis (see Figure 18). If Va11 is the output voltage with

Vsense =Vsense1 = 50 mV and Va12 is the output voltage with Vsense =Vsense2 = 5 mV, then

Vos can be calculated with the formula:

The amplification gain Av is defined as the ratio between the output voltage and the input

differential voltage.

CMR

–

ΔV

icm

⋅

------------------------------

log

⋅

SVR

–

ΔV

⋅

---------------------------

log

⋅

sense1

sense2

–

a11

a12

–

------------------------------------------------

out1

⋅

⎝⎠

⎛⎞

–

out

sense

------------------

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