MB40178 Fujitsu Microelectronics, Inc., MB40178 Datasheet - Page 12

• Manufacturer Part Number: MB40178
• Description: Single Chip 8-bit A/d And 9-bit D/a Converter
• Manufacturer: Fujitsu Microelectronics, Inc.

12
MB40168/MB40178
• Analog Input Equivalent Circuit
• Clamp Input Equivalent Circuit
EQUIVALENT CIRCUITS OF ADC BLOCK
V
C
R
V
I
V
V
BIAS
CCA
RB
D
INA
INA
INA
:
: This is the voltage on V
: Junction Capacitance of non-linear emitter follower
: Linear resistance model of input current by the comparator switching
: Constant input bias current
Base-Collector junction diode of emitter follower transistor
V
CLK = “H”:
INA
< V
A.GND
RB
V
A.GND
V
CCA
:
INC
RB
Pin, not V
A.GND
V
x 255 circuits
OUTC
RB
Pin itself.
2.0mA
- +
C
CLMP
V
V
CCA
INA
C
V
INA
CLMP
850k
0.6 x V
A.GND
CC
I
BIAS
+ 50mV +V
V
R
V
BE
D
RB
INA