S-89130BC-I8T1U Datasheet, PDF (13/26 Pages) Seiko Instruments Inc – MINI ANALOG SERIES

Rev.1.0_01
MINI ANALOG SERIES CMOS OPERATIONAL AMPLIFIER
S-89130/89140 Series
8. 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 12
• Voltage-gain (open loop) (AVOL)
The voltage gain (AVOL) can be calculated by the following expression, with measured VOUT at each VM.
Test conditions:
VM = VDD − 0.5 V: VM = VM1, VOUT = VOUT1,
VM = 0.5 V: VM = VM2, VOUT = VOUT2
 ^{AVOL = 20 log}
VM1 − VM2
VOUT1 − VOUT2
× ^RF_R⁺_S^RS_{}
9. Slew rate (SR)
Measured by the voltage follower circuit.
IN(+) = V_{CMR Max.}
t_R = t_F = 20 ns (0 V to V_{CMR Max.})
IN(+) = 0 V
V_OUT (= IN(−))
V_OUT (= IN(−))
t_THL
t_TLH
Figure 13
V_{CMR Max.}
V_{CMR Max.} × 0.9
V_{CMR Max.} × 0.1
SR =
VCMR Max. × 0.8
tTLH
SR =
VCMR Max. × 0.8
tTHL
13