LM2902MTX Просмотр технического описания (PDF) - ROHM Semiconductor
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LM2902MTX Datasheet PDF : 18 Pages
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LM358MX,LM2904MX,LM324MX,LM324MTX,LM2902MX
●Circuit Diagram
V+
-
INPUTS
+
Technical Note
OUTPUT
GND
Fig.97 Circuit Diagram (each Op-Amp)
●Measurement Circuit 1 NULL Method measurement Condition
Parameter
VF S1 S2 S3
LM358/LM324 family
V+ GND EK VICR
V+, GND, EK, VICR Unit : [V]
LM2904/LM2902 family Calculation
V+ GND EK VICR
Input Offset Voltage
VF1 ON ON OFF 5 to 30 0 -1.4 0 5 to 30 0 -1.4 0
1
Input Offset Current
VF2 OFF OFF OFF 5
0 -1.4 0
5
0 -1.4 0
2
Input Bias Current
VF3 OFF ON OFF 5
0 -1.4 0
5
0 -1.4 0
3
VF4 ON OFF
5
0 -1.4 0
5
0 -1.4 0
Large Signal Voltage Gain
VF5
VF6
ON
ON
ON
15
15
0 -1.4 0
0 -11.4 0
15
15
0 -1.4 0
0 -11.4 0
4
Common-mode Rejection Ratio
VF7
VF8
ON
ON OFF
5
5
0 -1.4 0
5
0 -1.4 3.5 5
0 -1.4 0
0 -1.4 3.5
5
Power supply Rejection Ratio
VF9
VF10
ON
ON OFF
5
30
0 -1.4 0
0 -1.4 0
5
30
0 -1.4 0
0 -1.4 0
6
－Calculation－
1.Input Offset Voltage (VIO)
VF1
Vio
[V]
1+ Rf /Rs
2.Input Offset Current (IIO)
Iio VF2 - VF1 [A]
Ri (1+ Rf / Rs)
3.Input Bias Current (IIb)
Ib VF4 - VF3 [A]
2× Ri (1+ Rf / Rs)
4. Large Signal Voltage Gain (Av)
10× (1+ Rf /Rs)
AV 20× Log
[dB]
VF6 - VF5
5.Common-mode Rejection Ration (CMRR)
VICR
CMRR 20× Log 3.5× (1+ Rf/ Rs) [dB]
VF8-VF7
6.Power supply rejection ratio (PSRR)
△V+×(1+Rf/Rs)
PSRR ＝20×Log
[dB]
VF10 - VF9
△ V+ =25V
0.1[μF]
S1
Rs Ri
50[Ω] 10[kΩ]
50[Ω] 10[kΩ]
Rs Ri
S2
Rf 50[kΩ]
Rf
50[kΩ]
500[kΩ]
V+
VOUT EK
DUT
S3
GND RL
500[kΩ]
1000[pF]
0.1[μF]
+15[V]
-15[V]
Fig.98 Measurement circuit1 (Each Op Amps)
V VF
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12/17
2011.06 - Rev.C
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