Integrated
Circuit
Systems, Inc.
General Description
Features
AV9173-01
Block Diagram
Video Genlock PLL
Phase-detector/VCO circuit block
Ideal for genlock system
Reference clock range 25 kHz to 1 MHz for full
output clock range
Input clocks down to 12 kHz possible with restricted
output conditions (see Table 1)
Output clock range 1.25 to 75 MHz
On-chip loop filter
Single 5 volt power supply
Low power CMOS technology
Small 8-pin DIP or SOIC package
The AV9173-01 provides the analog circuit blocks required
for implementing a video genlock dot (pixel) clock
generator. It contains a phase detector, charge pump, loop
filter, and voltage-controlled oscillator (VCO). By grouping
these critical analog blocks into one IC and utilizing
external digital functions, performance and design
flexibility are optimized as are development time and
system cost.
When used with an external clock divider, the AV9173-01
forms a Phase-Locked Loop configured as a frequency
synthesizer. The AV9173-01 is designed to accept video
horizontal synchronization (h-sync) pulses and produce a
video dot clock. A separated, negative-going sync input
reference pulse is required at pin 2 (IN).
The AV9173-01 is also suited for other clock recovery
applications in such areas as data communications.
ICS reserves the right to make changes in the device data identified in this
publication without further notice. ICS advises its customers to obtain the latest
version of all device data to verify that any information being relied upon by the
customer is current and accurate.
AV9173-01 Rev D 06/21/05
2
AV9173-01
Pin Descriptions
Pin Configuration
8-Pin DIP or SOIC
Table 1: Allowable Input Frequency to Output Frequency
(Outputs in MHz)
N
I
P
-
E
B
M
U
N
R
E
M
A
N
N
I
P
E
P
Y
T
N
O
I
T
P
I
R
C
S
E
D
1
N
I
B
F
t
u
p
n
I
t
u
p
n
I
k
c
a
b
d
e
e
F
2
N
I
t
u
p
n
I
e
s
l
u
p
c
n
y
s
e
c
n
e
r
e
f
e
r
r
o
f
t
u
p
n
I
3
D
N
G
--
d
n
u
o
r
G
4
0
S
F
t
u
p
n
I
t
u
p
n
i
0
t
c
e
l
e
S
y
c
n
e
u
q
e
r
F
5
E
O
t
u
p
n
I
e
l
b
a
n
E
t
u
p
t
u
O
6
1
K
L
C
t
u
p
t
u
O
1
t
u
p
t
u
O
k
c
o
l
C
7
D
D
V
--
)
V
5
+
(
y
l
p
p
u
S
r
e
w
o
P
8
2
K
L
C
t
u
p
t
u
O
)
1
k
c
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l
C
m
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r
f
2
-
y
b
-
d
e
d
i
v
i
D
(
2
t
u
p
t
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k
c
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l
C
f
N
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(
)
z
H
k
f
T
U
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)
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H
M
(
0
=
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F
r
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f
f
T
U
O
)
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(
1
=
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r
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f
t
u
p
t
u
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1
K
L
C
t
u
p
t
u
O
2
K
L
C
t
u
p
t
u
O
1
K
L
C
t
u
p
t
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2
K
L
C
2
1
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k
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1
5
7
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t
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4
4
5
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7
3
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0
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2
2
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1
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1
1
5
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3
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0
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7
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0
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5
1
5
7
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1
o
t
5
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5
7
3
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9
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5
7
.
3
7
1
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k
0
3
5
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0
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5
2
5
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5
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2
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5
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3
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0
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5
5
7
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8
1
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t
5
.
2
5
7
3
.
9
o
t
5
2
.
1
3
AV9173- 01
Using the AV9173- 01
Figure 1: Typical Application of AV9173-01 in a Video Genlock System
Most video sources, such as video cameras, are
asynchronous, free-running devices. To digitize video or
synchronize one video source to another free-running
reference video source, a video "genlock" (generator lock)
circuit is required. The AV9173-01 integrates the analog
blocks which make the task much easier.
In the complete video genlock circuit, the primary function of
the AV9173-01 is to provide the analog circuitry required to
generate the video dot clock within a PLL. This application is
illustrated in Figure 1. The input reference signal for this circuit
is the horizontal synchronization (h-sync) signal. If a
composite video reference source is being used, the h-sync
pulses must be separated from the composite signal. A video
sync separator circuit, such as the National Semiconductor
LM1881, can be used for this purpose.
The clock feedback divider shown in Figure 1 is a digital
divider used within the PLL to multiply the reference
frequency. Its divide ratio establishes how many video dot
clock cycles occur per h-sync pulse. For example, if 880 pixel
clocks are desired per h-sync pulse, then the divider ratio is set
to 880. Hence, together the h-sync frequency and external
divider ratio establish the dot clock frequency:
f
OUT
=
f
IN
N where N is external divide ratio
Both AV9173-01 input pins IN and FBIN respond only to
negative-going clock edges of the input signal. The h-sync
signal must be constant frequency in the 25 kHz to 1 MHz range
and stable (low clock jitter) for creation of a stable output
clock.
Refer to Application Brief (AB01) for additional details on use
of input frequencies below 25kHz. By following the guidelines
in this brief and meeting the test conditions in the AC
specifications (VCO frequency), an input as low as 12kHz
(such as NTSC or PAL h-sync) can be used.
The output hook-up of the AV9173-01 is dictated by the
desired dot clock frequency. The primary consideration is the
internal VCO which operates over a frequency range of
10 MHz to 75 MHz. Because of the selectable VCO output
divider and the additional divider on output CLK2, four
distinct output frequency ranges can be achieved. The
following Table lists these ranges and the corresponding
device configuration.
Note that both outputs, CLK1 and CLK2, are available during
operation even though only one is fed back via the external
clock divider.
Pin 5, OE, tristates both CLK1 and CLK2 upon logic low input.
This feature can be used to revert dot clock control to the
system clock when not in genlock mode (hence, when in
genlock mode the system dot clock must be tristated).
When unused, inputs FS0 and OE must be tied to either GND
(logic low) or VDD (logic high).
For further discussion of VCO/PLL operation as it applies to
the AV9173-01, please refer to the AV9170 application note.
The AV9170 is a similar device with fixed feedback dividers for
skew control applications.
0
S
F
e
t
a
t
S
d
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s
U
t
u
p
t
u
O
e
g
n
a
R
y
c
n
e
u
q
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r
F
0
0
1
1
1
K
L
C
2
K
L
C
1
K
L
C
2
K
L
C
z
H
M
5
7
-
0
1
z
H
M
5
.
7
3
-
5
z
H
M
5
7
.
8
1
-
5
.
2
z
H
M
5
7
3
.
9
-
5
2
.
1
4
AV9173-01
Absolute Maximum Ratings
V
DD
(referenced to GND) . . . . . . . . . . . . . . . . 7.0 V
Operating Temperature under Bias . . . . . . . . . 0C to +70C
Storage Temperature . . . . . . . . . . . . . . . . . . . . 65C to +150C
Voltage on I/O pins referenced to GND . . . . . GND 0.5 V to V
DD
+ 0.5 V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 0.5 watts
Stresses above those listed under Absolute Maximum Ratings above may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those listed in the operational sections
of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product
reliability.
V
DD
= +5V 5%, T
A
= 0C to 70C, unless otherwise stated
Electrical Characteristic
Notes:
1. Duty cycle measured at 1.4V.
2. Input Reference Frequency = 25 kHz, Output Frequency = 25 MHz. Jitter measured between adjacent vertical pixels.
3. CLK1 frequency applies for FS = 0. For FS = 1 condition, divide allowable CLK1 range by the factor of 4.
S
C
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T
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T
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5
=
--
--
8
.
0
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e
g
a
tl
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h
g
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V
5
=
0
.
2
--
--
V
t
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r
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w
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L
t
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p
n
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N
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V
0
=
-5
--
--
A
t
n
e
r
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u
C
h
g
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H
t
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p
n
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N
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=
D
D
-5
--
5
A
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a
tl
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w
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t
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1
V
L
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m
8
=
--
--
4
.
0
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e
g
a
tl
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h
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1
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m
1
-
=
V
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V
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.
5
=
V
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D
V
4
.
0
-
--
--
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e
g
a
tl
o
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h
g
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1
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m
4
-
=
V
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.
5
=
V
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8
.
0
-
--
--
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e
g
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h
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1
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H
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H
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A
m
8
-
=
4
.
2
--
--
V
t
n
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r
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l
p
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0
5
,
d
e
d
a
o
l
n
U
--
0
2
0
5
A
m
5
AV9173- 01
V
DD
= +5V 5%, T
A
= 0C to 70C, unless otherwise stated
Electrical Characteristics
Notes:
1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
2. Input Reference Frequency = 25 kHz, Output Frequency = 25 MHz. Jitter measured between adjacent vertical pixels.
3. CLK1 frequency applies for FS = 0. For FS = 1 condition, divide allowable CLK1 range by the factor of 4.
4. An Application Brief (AB01) documents the operation of the AV9173 for low input frequencies. This provides
guidelines for usable output frequencies and feedback ratios required to use inputs below 25 kHz. By following these
guidelines, the AV9173 will operate down to 12 kHz inputs across temperature, voltage and lot-to-lot variation.
S
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