S-89110A Datasheet, PDF (7/18 Pages) Seiko Instruments Inc – MINI ANALOG SERIES CMOS OPERATIONAL AMPLIFIER

Rev.2.2_00
MINI ANALOG SERIES CMOS OPERATIONAL AMPLIFIER
S-89110A/89120A
„ Measurement Circuit
1. Power supply voltage rejection ratio, input offset voltage
V_DD
y Power supply voltage rejection ratio (PSRR)
The power supply voltage rejection ratio (PSRR) can
R_F
be calculated by the following expression, with V_OUT
measured at each V_DD.
R_S
−
+
R_S
R_F
V_CMR=V_DD / 2
V_OUT
Measurement conditions:
When V_DD = 1.8 V: V_DD = V_DD1, V_OUT = V_OUT1
When V_DD = 5.0 V: V_DD = V_DD2, V_OUT = V_OUT2
PSRR = 20 log
V_DD1 − V_DD2
V_OUT1−
V_DD1
2
−
V_OUT2−
V_DD2
2
×
R_F + R_S
R_S
y Input offset voltage (V_IO)
Figure 6
VIO =  VOUT − ^VDD  × ^Rs

2 _ RF + RS
2. Common-mode input signal rejection ratio, common-mode input voltage range
V_DD
y Common-mode input signal rejection ratio (CMRR)
The common-mode input signal rejection ratio
R_F
(CMRR) can be calculated by the following
expression, with V_OUT measured at each V_IN.
R_S
R_S
V_IN
−
+
R_F
V_DD / 2
V_OUT
Measurement conditions:
When V_IN = V_CMR (max.): V_IN = V_IN1, V_OUT = V_OUT1
When V_IN = V_DD/2: V_IN = V_IN2, V_OUT = V_OUT2
CMRR = 20 log
V_IN1 − V_IN2
V_OUT1 − V_OUT2
× ^{RF + RS}
R_S
y Common-mode input voltage range (V_CMR)
The common-mode input voltage range is the range
of V_IN in which V_OUT satisfies the common-mode input
signal rejection ratio specifications.
Figure 7
Seiko Instruments Inc.
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