S-89431A Seiko Instruments, S-89431A Datasheet - Page 8

• Manufacturer Part Number: S-89431A
• Description: MINI ANALOG SERIES 0.5 uA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
• Manufacturer: Seiko Instruments

8
MINI ANALOG SERIES
S-89430A/89431A
Measurement Circuit
1. Power supply voltage rejection ratio
2. Input offset voltage
0.45V
V
R
R
CMR
R
R
S
S
S
S
= V
DD
R
R
R
F
/ 2
R
F
F
Figure 7
Figure 8
F
−
+
−
+
V
V
DD
DD
0.5 µA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
V
V
OUT
OUT
Seiko Instruments Inc.
Power supply voltage rejection ratio (PSRR)
Measurement conditions:
PSRR = 20log
Input offset voltage (V
The power supply voltage rejection ratio (PSRR) can
be calculated by the following expression, with V
measured at each V
When V
When V
V
IO
=



V
DD
DD
OUT
= 0.9 V: V
= 5.5 V: V
−
V
V
2
DD
V
OUT1
DD1



×
DD
DD
DD
− V
− V
R
IO
.
F
)
= V
= V
R
DD2
OUT2
+
S
R
DD1
DD2
S
, V
, V
×
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OUT
OUT
R
F
R
+ R
S
= V
= V
S
OUT1
OUT2
Rev.5.1
_00
OUT