CS30 Datasheet, PDF (12/18 Pages) List of Unclassifed Manufacturers – METAL STRIP SHUNT RESISTROS FOR DETECTING ELETRICAL CURRENT

Parameter definitions
CS30
4
Parameter definitions
4.1
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 V_p and V_m. 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:
CMR = –20 ⋅ log -_Δ----V--^Δ--_i-_c-V--_m--^o---^u_â‹---^t_A-----v-
4.2
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 V_CC. 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:
SVR = –20 ⋅ log -_Δ----V-^Δ---_C-V--_C---^o--_â‹-^u--A-^t----v-
4.3
Gain (Av) and input offset voltage (V_os)
The input offset voltage is defined as the intersection between the linear regression of the
V_out versus V_sense curve with the X-axis (see Figure 20). If V_out1 is the output voltage with
V_sense=V_sense1=50mV and V_out2 is the output voltage with V_sense=V_sense2=5mV, then V_os
can be calculated with the following formula:
V_os
=
V_sense1
–


V-----_{s--Ve---n-o--s-u--e-t--11----}––_{-----VV----so---eu--n-t-2-s---e---2-}
⋅
V_ou
t

1_
The amplification gain A_v is defined as the ratio between output voltage and input differential
voltage:
Av = _V----V-s--_e-^o--_n-^u--_s-^t--_e-
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