S-89430ACNC-HBUTFZ Datasheet, PDF (14/33 Pages) Seiko Instruments Inc – MINI ANALOG SERIES

MINI ANALOG SERIES 0.5 μA Rail-to-Rail CMOS OPERATIONAL AMPLIFIER
S-89430/89431 Series
Rev.2.1_01
9. Voltage gain (open loop)
R_S
R_S
R_F
V_DD
R_F
−
D.U.T
+
R_L
V_CMR = V_DD / 2
V_DD / 2
V_DDN
+
NULL
−
V_SSN
V_M
V_OUT
Figure 16
• Voltage gain (open loop) (AVOL)
The voltage gain (AVOL) can be calculated by the following expression, with VOUT measured at each VM.
Test conditions:
When VM = VDD − 0.1 V: VM = VM1, VOUT = VOUT1,
When VM = VSS − 0.1 V: VM = VM2, VOUT = VOUT2
RL = 1 MΩ
 ^{AVOL = 20 log}
VM1 − VM2
VOUT1 − VOUT2
× ^RF_R⁺_S^RS_{}
10. Slew rate (SR)
Measured by the voltage follower circuit.
V_DD
V_IN(+)
V_SS
(= 0 V)
t_R = t_F = 1 μs (V_SS to V_DD)
t_THL
V_OUT
(= V_IN(－))
V_DD × 0.9
V_DD × 0.1
t_TLH
Figure 17
At fall
SR =
VDD × 0.8
tTHL
At rise
SR =
VDD × 0.8
tTLH
14