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UPC659A Datasheet(PDF) 4 Page - NEC

Part No. UPC659A
Description  8-BIT A/D CONVERTER FOR VIDEO PROCESSING WITH REFERENCE GENERATOR AND CLAMP CIRCUIT
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
Logo NEC - NEC

UPC659A Datasheet(HTML) 4 Page - NEC

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4
µPC659A
PIN FUNCTIONS
Equivalent Circuit
Function
Reference voltage (Top)
Reference voltage (Bottom)
Analog signal
Input analog signal from this pin. The
signal is read at rising edge of the
clock. The clamp function also will be
worked on this pin. So it’s necessary
to connect capacitance and low
impedance signal source. The burst
signal is protected at pedestal clamp
because of soft clamp circuit.
Clamp pulse
Analog signal input from analog input
pin is clamped to the voltage; VCL
according to the high level term of this
pulse. During high level signal is
input, analog input pin voltage is
nearly clamped to voltage VCL.
Clamp voltage
Set voltage at clamping analog input
signal.
Analog input signal is clamped nearly
to this input voltage VCL according to
the clamp pulse PCL high level period.
Clock
Analog data acquisition and digital
data out are synchronized with the
rising edge of this clock.
Power supply for analog circuit
Pin
Name
VRT
VRB
VIN
PCL
VCL
CLK
AVCC
Input/
Output
Input
Input
Input
Input
Input
Input
Pin
No.
1
10
4
6
7
24
3, 8, 11
AVCC
1.41
k
800
AGND
1.91 k
AGND
VRB
VRT
AGND
AVCC
AVCC
AVCC
AGND
AGND
AGND
AVCC
AGND
AVCC
AGND
AVCC
AVCC
AGND
AVCC
AGND
AVCC
AVCC


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