S-89430A Datasheet, PDF (11/23 Pages) Seiko Instruments Inc – MINI ANALOG SERIES 0.5 μA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER

MINI ANALOG SERIES 0.5 µA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
Rev.5.1_00
S-89430A/89431A
8. Slew rate (SR):
Measured by the voltage follower circuit
IN (+) = V_DD
IN (+) = 0 V
V_OUT
V_OUT
t_R = t_F = 1 µs (0 V ∼ V_DD)
t_THL
t_TLH
V_OH
V_OL
When falling
SR = ^{VOH − VOL}
tTHL
When rising
SR = ^{VOH − VOL}
tTLH
Figure 15
When V_DD=3.0 V When V_DD=1.8 V When V_DD=0.9 V
V_OH
2.7 V
1.62 V
0.81 V
V_OL
0.3 V
0.18 V
0.09 V
9. Voltage gain (open loop)
V_DD
R_F
R_S
−
D₊.U.T
R_S
R_F
1 MΩ
V_CMR=V_DD / 2
V_DD / 2
V_DDN
+
NULL
−
V_SSN
V_M
V_OUT
Figure 16
y Voltage gain (open loop) (A_VOL)
The voltage gain (A_VOL) can be calculated by the following formula, with the value of VOUT
measured at each VM.
Measurement conditions:
When V_M = V_DD − 0.1 V: V_M = V_M1, V_OUT = V_OUT1
When V_M = 0.1 V: V_M = V_M2, V_OUT = V_OUT2
AVOL = 20log  ^{VM1 − VM2} × ^{RF + RS} 
 ^{VOUT1 − VOUT2}
RS _
Seiko Instruments Inc.
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