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| S-89430A Datasheet, PDF (8/23 Pages) Seiko Instruments Inc – MINI ANALOG SERIES 0.5 μA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER | |||
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MINI ANALOG SERIES 0.5 µA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
S-89430A/89431A
Rev.5.1_00
 Measurement Circuit
1. Power supply voltage rejection ratio
VDD
RF
RS
â
+
RS
RF
VOUT
0.45V
y 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.
Measurement conditions:
When VDD = 0.9 V: VDD = VDD1, VOUT = VOUT1
When VDD = 5.5 V: VDD = VDD2, VOUT = VOUT2
PSRR = 20log
VDD1 â VDD2
VOUT1 â VOUT2
Ã
RF + RS
RS
Figure 7
2. Input offset voltage
VDD
RF
RS
â
+
RS
RF
VCMR = VDD / 2
Figure 8
y Input offset voltage (VIO)
VIO
=


VOUT
ï£
â
VDD
2



Ã
RS
RF + RS
VOUT
8
Seiko Instruments Inc.
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