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S89713 Datasheet, PDF (7/24 Pages) Seiko Instruments Inc – MINI ANALOG SERIES LOW INPUT OFFSET VOLTAGE CMOS OPERATIONAL AMPLIFIER | |||
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MINI ANALOG SERIES LOW INPUT OFFSET VOLTAGE CMOS OPERATIONAL AMPLIFIER
Rev.3.4_00
S-89713 Series
ï® Test Circuits (Per circuit)
1. Power supply voltage rejection ratio, input offset voltage
CF
⢠Power supply voltage rejection ratio (PSRR)
RS
RS
RF
VDD
â
D.U.T
+
CF
VCMR = VDD / 2
RF
VDDN
+
NULL
â
VSSN
The power supply voltage rejection ratio (PSRR) can be
calculated by the following expression, with VOUT measured at
each VDD.
VOUT
Test conditions:
VDD = 2.65 V: VDD = VDD1, VOUT = VOUT1
VDD = 5.5 V: VDD = VDD2, VOUT = VOUT2
PSRR = 20 log
ï§ï¦
ï¨ï§
VDD1 â VDD2
ï¨ï¦VOUT1 â VD2D1ï¸ï¶ â ï¨ï¦VOUT2 â VD2D2ï¸ï¶
à RFR+SRSï¸ï·ï·ï¶
Figure 5 Test Circuit 1
⢠Input offset voltage (VIO)
VIO
=
ï¨ï¦VOUT
â
V2DDï¸ï¶
Ã
RS
RF + RS
2. Common-mode input signal rejection ratio, common-mode input voltage range
CF
⢠Common-mode input signal rejection ratio (CMRR)
RS
RS
RF
VIN
RF
VDD
VDDN
â
D+ .U.T
CF
VM = VDD / 2
+
NULL
â
VSSN
The common-mode input signal rejection ratio (CMRR) can be
calculated by the following expression, with VOUT measured at
each VIN.
VOUT
Test conditions:
VIN = VCMR Max.: VIN = VIN1, VOUT = VOUT1
VIN = VCMR Min.: VIN = VIN2, VOUT = VOUT2
CMRR = 20 log ï¨ï§ï¦
VIN1 â VIN2
(VOUT1 â VIN1) â (VOUT2 â VIN2)
à RFR+SRSï¸ï·ï¶
Figure 6 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.
7
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