BU7232FVM-TR Datasheet, PDF (11/17 Pages) Rohm – Low Voltage CMOS Comparator

● Schematic diagram
Fig.1 Simplified schematic
● Test circuit1 NULL method
VDD,VSS,EK,Vicm, Unit : [V]
Parameter
VF
S1
Input offset voltage
VF1 ON
Large signal voltage gain
VF2
ON
VF3
Common-mode rejection ratio
VF4
(Input common-mode voltage range) _VF5
ON
VF6
Power supply rejection ratio
ON
VF7
S2
S3
Calculation
VDD VSS EK Vicm
ON OFF
3
0
-0.1 0.3
1
-0.3
ON ON
3
0
0.3
2
-2.7
0
ON OFF
3
0
-0.1
3
3
1.8
ON OFF
0
-0.1 0.3
4
5.5
－Calculation－
1. Input offset Voltage (Vio)
|VF1|
Vio =
[V]
1+Rf/Rs
2. Large signal voltage gain (Av)
3. Common-mode rejection ratio (CMRR)
4. Power supply rejection ratio (PSRR)
S1
0.1[uF]
RS_＝ 50[Ω]
Vicm
Ri_＝ 1[MΩ]
Ri_＝ 1[MΩ]
RS_＝50[Ω] _0.1[uF]
VDD
DUT
VSS
S2
50[kΩ]
0.47[µF]
Rf
50[kΩ]
EK
RK
500[kΩ]
500[kΩ]
RK
0.01[µF]
+15[V]
NULL
S3
-15[V]
VF
RL
Fig.2 Test Circuit 1 (one channel only)
11/16