S-19611AB0H-K8T2U Datasheet, PDF (7/20 Pages) Seiko Instruments Inc – LOW INPUT OFFSET VOLTAGE CMOS OPERATIONAL AMPLIFIER

MINI ANALOG SERIES FOR AUTOMOTIVE 105°C OPERATION LOW INPUT OFFSET VOLTAGE CMOS OPERATIONAL AMPLIFIER
Rev.1.0_01
S-19611A
 Test Circuits (Per circuit)
1. Power supply voltage rejection ratio, input offset voltage
C_F
• Power supply voltage rejection ratio (PSRR)
R_S
R_S
R_F
V_DD
−
D.U.T
+
C_F
V_CMR = V_DD / 2
R_F
V_DDN
+
NULL
−
V_SSN
The power supply voltage rejection ratio (PSRR) can be
calculated by the following expression, with VOUT measured at
each VDD.
V_OUT
Test conditions:
VDD = 2.65 V: VDD = VDD1, VOUT = VOUT1
VDD = 5.50 V: VDD = VDD2, VOUT = VOUT2
PSRR = 20 log


VDD1 − VDD2
^{VOUT1 − VD}2^D1 ^− ^{VOUT2 − VD}2^D2
× ^RF_R⁺_S^RS_{}
Figure 3 Test Circuit 1
• Input offset voltage (VIO)
VIO
=
^{VOUT − V}2^DD
×
RS
RF + RS
2. Common-mode input signal rejection ratio, common-mode input voltage range
C_F
• Common-mode input signal rejection ratio (CMRR)
R_S
R_S
R_F
V_IN
R_F
V_DD
V_DDN
−
D₊ .U.T
C_F
V_M = V_DD / 2
+
NULL
−
V_SSN
The common-mode input signal rejection ratio (CMRR) can be
calculated by the following expression, with VOUT measured at
each VIN.
V_OUT
Test conditions:
VIN = VCMR Max.: VIN = VIN1, VOUT = VOUT1
VIN = VCMR Min.: VIN = VIN2, VOUT = VOUT2
CMRR = 20 log _{}
VIN1 − VIN2
(VOUT1 − VIN1) − (VOUT2 − VIN2)
× ^RF_R⁺_S^RS_{}
Figure 4 Test Circuit 2
• Common-mode input voltage range (VCMR)
The common-mode input voltage range is the range of VIN in
which VOUT satisfies the common-mode input signal rejection
ratio specifications.
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