AMC1305L25 Datasheet, PDF (26/39 Pages) Texas Instruments – AMC1305x High-Precision, Reinforced Isolated Delta-Sigma Modulators

AMC1305L25, AMC1305M05, AMC1305M25
SBAS654C – JUNE 2014 – REVISED DECEMBER 2014
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Typical Applications (continued)
This additional series resistor (R3') influences the gain error of the circuit. The effect can be calculated using
Equation 5 with R5 = R5' = 50 kΩ and R4 = R4' = 2.5 kΩ (for the AMC1305M05) or 12.5 kΩ (for the
AMC1305x25).
E_G (%)
¨§1
©

R4
R4' R3'
¸·
¹
* 100%
(5)
10.2.2.3 Application Curve
Figure 54 shows the dependency of the input bias current on the common-mode voltage at the input of the
AMC1305.
60
40
20
0
-20
-40
-60
1305x25
1305M05
-80
-0.5
0
0.5
1
1.5
2
2.5
3
V_CM (V)
D001
Figure 54. Input Current vs. Input Common-Mode Voltage
26
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