MB4053 Datasheet, PDF (8/17 Pages) Fujitsu Component Limited. – 6-Channel 8-BIT A/D Converter

MB4053
s MEASURMENT CIRCUIT
4.75 V
A1
I1 VCC
I2
I3
I4
I5
I6
RAMP
RAMP
A1
A2 ^START CH GND RREF ^STOP VREF
CH
2.75 V
20 kΩ
IR
4.75 V 4.75 V
Note: Adjust RREF in the range 40 to 200 kΩ so that IR is 12 to 50 µA.
s DIAGRAM
A0 to A2 Input
tSL
RAMP START Input
tA
tO
CH Voltage
Slope = – ^IR
CH
RAMP STOP Output
s CHANNEL SELECTION
Input address line
A2
A1
A0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
8
tR
tC
Selected analog input
GND
I1
I2
I3
I4
I5
I6
VREF
VIH
VIL
VIH
VIL
VIN + VBE1
VBE2
0V
VOH
VOL