ISL70617SEH Datasheet, PDF (24/28 Pages) Intersil Corporation – High voltage process control

ISL70617SEH
The following switch example (Figure 52) is a practical way to
isolate switch parasitic capacitances from the R_IN pins:
+R_IN
R₀
2.5k
S0
R₁
2.5k
-R_IN
R₂
S1
15k
+R_INSENSE
KELVIN
R₃
45k
S2
CONTACT
S3
R₄
95k
-R_INSENSE
KELVIN
CONTACT
FIGURE 52. SWITCH EXAMPLE
The R_FB and R_IN resistors are provided with Kelvin sense pins to
minimize interconnect resistance errors. This is especially useful
at high gains and small R_IN.
Amplifier Usage Examples
The external resistors, R_FB and R_IN, set both the voltage gain and
the linear output voltage range. The linear output voltage range
is the maximum differential signal that can appear at the output,
and is different from the common-mode range. The voltage gain
is shown in Equation 21.
A_V = (R_FB/R_IN)
(EQ. 21)
Linear output voltage range is shown in Equation 22.
V_O(LIN) = ±(R_FB × I_RIN)
(EQ. 22)
where I_RFB is nominally set to 80% of I_RIN.
For example, an application requiring a voltage gain of 100 and a
linear output range of ±2.5V might select a 30kΩ feedback
resistor and a 300Ω input resistor to ensure linear operation
throughout the required output span. The output offset voltage
(Table 2 on page 22) shows a few standard gain configurations
and linear output spans with appropriately sized resistors.
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FN8697.4
December 16, 2016