Panasonic MN3870S Datasheet
CCD Delay Line Series
MN3870S
NTSC-Compatible CCD Comb Filter with Built-in 1 H Video Signal Dela y Element
Overview
The MN3870S is a 4 fSC CMOS CCD comb filter with
a built-in 4 f
CMOS CCD signal delay element for video
SC
signal processing applications.
It contains such components as a fourfold-frequency
circuit, a shift register clock driver, a CCD analog shift
register switchable between 911, 1 and 908 / 906 stages,
and a resampling output amplifier.
It samples the input using the supplied clock signal with
a frequency of four times the color signal subcarrier frequency (3.58 MHz) and subtracts between the 911- and
1-stage CCD output signals to produce the color signal
comb characteristics for the NTSC system.
It also uses this fourfold frequency to drive a 908- or
906-stage CCD and samples the input to produce, after
adding in the attached filter delay, a delay of 1 H (the
horizontal scan period) when the SW pin is left open.
Features
Single 5.0 V power supply
Low power consumption based on CMOS process
Low EMI levels from clock during driving
True comb filter produced by the subtraction of the
through signal and the 1 H delay signal
Pin Assignment
X1
V
BB
N.C.
VGC1
VOC
VINC
N.C.
N.C.
V
SS1
V
DD1
1
2
3
4
5
6
7
8
9
10
SOP020-P-0300C
( TOP VIEW )
PCOUT
20
19
18
17
16
15
14
13
12
11
&
VCOIN
N.C.
V
SS3
V
DD3
V
DD2
V
SS2
VGC2
SW
VINY
VOY
Applications
VCRs, Video cameras
1
MN3870S CCD Delay Line Series
Block Diagram
VINY
VINC
DD1
V
10
Clamp
circuit
12
Charge
input
block
6
Charge
input
block
Charge
input
block
DD2VDD3
V
16
Bias circuit
908 or 906-stage
analog shift register
911-stage
analog shift register
1-stage
analog shift register
SW
17
13
Mode
switch
Booster
circuit
Charge
detector
Charge
–
detector
VGC1
4
Resampling
output amplifier
Resampling
output amplifier
VGC2
14
11
VOY
5
VOC
Charge
detector
øSY driver
Waveform
adjustment
block
ø1Y driver
øRY driver
XI
1
Waveform
amplifier
adjustment
block
Phase
comparator
Timing
adjustment
1/4th
frequency
divider
VCO
20
PCOUT & VCOIN
ø2Y driver
Waveform
adjustment
block
Timing
adjustment
9
SS1VSS2
V
15
øSHY driver
øSHY driver
ø1C driver
ø2C driver
øSC driver
øRC driver
øSHC driver
øSHC driver
Substrate bias
generator
18
SS3
V
2
BB
V
2
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