S-89430ACNC-HBUTFZ Datasheet, PDF (11/33 Pages) Seiko Instruments Inc – MINI ANALOG SERIES

MINI ANALOG SERIES 0.5 μA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
Rev.2.1_01
S-89430/89431 Series
 Test Circuit (Per Circuit)
1. Power supply voltage rejection ratio
V_DD
R_F
R_S
−
+
R_S
R_F
V_OUT
0.45 V
• Power supply voltage rejection ratio (PSRR)
The power supply voltage rejection ratio (PSRR) can be
calculated by the following expression, with VOUT measured at
each VDD.
Test conditions:
When VDD = 0.9 V: VDD = VDD1, VOUT = VOUT1,
When VDD = 5.5 V: VDD = VDD2, VOUT = VOUT2
PSRR = 20 log

VDD1 − VDD2
VOUT1 − VOUT2
× ^RF_R⁺_S^RS_{}
Figure 8
2. Input offset voltage
V_DD
R_F
R_S
−
+
R_S
R_F
• Input offset voltage (VIO)
VIO =
^{VOUT − V}2^DD
×
RS
RF + RS
V_OUT
V_CMR = V_DD / 2
Figure 9
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