MB40578P Просмотр технического описания (PDF) - Fujitsu

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MB40578P

1 CHANNEL 8-BIT VIDEO A/D CONVERTER

Fujitsu 

MB40578

V CCA

V INA

Figure 2 Analog Input Equivalent Circuit

V CCA

V INA

C INA

VD

I BIAS

R INA

A.GND

A.GND

V RB

X255 Circuits

CINA: Non-linear Emitter-follower Junction Capacitance

RINA: Linear Resistance Model for Input Current Transition by Comparator Switching:

Infinite value for VIN < VRB or when CLK = High

VRB: Voltage at VRB terminal

IBIAS: Constant Input Bias Current

VD: The base-collector junction diode of emitter-follower transistor.

Figure 3 Digital Input Equivalent

V CCA

25 kΩ

3.1 kΩ 25 kΩ

2.1 kΩ

Figure 4 Load Circuit for Output Buffer

Measurement

point

V CCD

RL

To Output pin

Input

CL

V REF=1.4 V

A.GND

D.GND

Note RL = 2 kΩ

CL = 15 pF including scope and jig capacitance

Diodes:IN3064 or equivalent

7

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