MB40528 Datasheet, PDF (8/14 Pages) Fujitsu Component Limited. – 1 Channel 8-bit A/D Converter

MB40528
s EQUIVALENT CIRCUITS
Figure 2. Analog Input Equivalent Circuit
VCC
VINA
VCC
VINA
CINA
VD
IBIAS
RINA
x 255 CIRCUITS
GND
GND
VRB
CINA: Non-linear Emitter-follower Junction Capacitance
RINA: Linear Resistance Model for Input Current Transition by Comparator Switching:
finite value for VINA < VRB or when CLK = “H” level
VRB: Voltage at VRB pin (Not the VRB pin itself)
IBIAS: Constant Input Bias Current
VD: The base-collector junction diode of emitter-follower transistor.
Figure 3. Reference Voltage Circuit
VCC
GND
20kΩ
Buffer
IRB
VRB pin
30kΩ
8