1
FN7175.3
EL4585
Horizontal Genlock, 8F
SC
The EL4585 is a PLL (Phase Lock Loop) sub-system,
designed for video applications and also suitable for general
purpose use up to 36MHz. In video applications, this device
generates a TTL/CMOS-compatible pixel clock (CLK OUT)
which is a multiple of the TV horizontal scan rate and phase
locked to it.
The reference signal is a horizontal sync signal, TTL/CMOS
format, which can be easily derived from an analog
composite video signal with the EL4583 sync separator. An
input signal to "coast" is provided for applications where
periodic disturbances are present in the reference video
timing such as VTR head switching. The lock detector output
indicates correct lock.
The divider ratio is four ratios for NTSC and four similar
ratios for the PAL video timing standards by external
selection of three control pins. These four ratios have been
selected for common video applications including 8F
SC
,
6F
SC
, 27MHz (CCIR 601 format) and square picture
elements used in some workstation graphics. To generate
4F
SC
, 3F
SC
, 13.5MHz (CCIR 601 format) etc., use the
EL4584, which does not have the additional divide-by-two
stage of the EL4585.
For applications where these frequencies are inappropriate
or for general purpose PLL applications the internal divider
can be bypassed and an external divider chain used.
Features
36MHz, general purpose PLL
8F
SC
timing (use the EL4584 for 4F
SC
)
Compatible with EL4583 sync separator
VCXO, Xtal, or LC tank oscillator
< 2ns jitter (VCXO)
User-controlled PLL capture and lock
Compatible with NTSC and PAL TV formats
8 pre-programmed popular TV scan rate clock divisors
Single 5V, low current operation
Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
Pixel clock regeneration
Video compression engine (MPEG) clock generator
Video capture or digitization
PIP (Picture in Picture) timing generator
Text or graphics overlay timing
FREQUENCIES AND DIVISORS
FUNCTION
6F
SC
(NOTE 1)
CCIR 601
(NOTE 2)
SQUARE
(NOTE 3)
8F
SC
Divisor (Note 4)
1702
1728
1888
2270
PAL F
OSC
(MHz)
26.602
27.0
29.5
35.468
Divisor (Note 4)
1364
1716
1560
1820
NTSC F
OSC
(MHz)
21.476
27.0
24.546
28.636
NOTES:
1. 6F
SC
frequencies do not yield integer divisors.
2. CCIR 601 divisors yield 1440 pixels in the active portion of each
line for NTSC and PAL.
3. Square pixels format gives 640 pixels for NTSC and 768 pixels
for PAL.
4. Divisor does not include 2 block.
Ordering Information
PART
NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG.
#
EL4585CN
16-Pin PDIP
-
MDP0031
EL4585CS
16-Pin SO (0.150")
-
MDP0027
EL4585CS-T7
16-Pin SO (0.150")
7"
MDP0027
EL4585CS-T13
16-Pin SO (0.150")
13"
MDP0027
EL4585CSZ
(See Note)
16-Pin SO (0.150")
(Pb-free)
-
MDP0027
EL4585CSZ-T7
(See Note)
16-Pin SO (0.150")
(Pb-free)
7"
MDP0027
EL4585CSZ-T13
(See Note)
16-Pin SO (0.150")
(Pb-free)
13"
MDP0027
*For 3F
SC
and 4F
SC
clock frequency operation, see EL4584
datasheet.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Data Sheet
July 1, 2005
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003-2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
3
FN7175.3
July 1, 2005
Absolute Maximum Ratings
(T
A
= 25
C)
V
CC
Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to V
CC
+0.5V
Operating Ambient Temperature Range . . . . . . . . . .-40C to +85C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +125C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400mW
Oscillator Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36MHz
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
DC Electrical Specifications
V
DD
= 5V, T
A
= 25C unless otherwise noted
Parameter
Conditions
Min
Typ
Max
UniT
I
DD
V
DD
= 5V (Note 1)
2
4
mA
V
IL
Input Low Voltage
1.5
V
V
IH
Input High Voltage
3.5
V
I
IL
Input Low Current
All inputs except COAST, V
IN
= 1.5V
-100
nA
I
IH
Input High Current
All inputs except COAST, V
IN
= 3.5V
100
nA
I
IL
Input Low Current
COAST pin, V
IN
= 1.5V
-100
-60
A
I
IH
Input High Current
COAST pin, V
IN
= 3.5V
60
100
A
V
OL
Output Low Voltage
Lock Det, I
OL
= 1.6mA
0.4
V
V
OH
Output High Voltage
Lock Det, I
OH
= -1.6mA
2.4
V
V
OL
Output Low Voltage
CLK, I
OL
= 3.2mA
0.4
V
V
OH
Output High Voltage
CLK, I
OH
= -3.2mA
2.4
V
V
OL
Output Low Voltage
OSC Out, I
OL
= 200A
0.4
V
V
OH
Output High Voltage
OSC Out, I
OH
= -200A
2.4
V
I
OL
Output Low Current
Filter Out, V
OUT
= 2.5V
200
300
A
I
OH
Output High Current
Filter Out, V
OUT
= 2.5V
-300
-200
A
I
OL
/I
OH
Current Ratio
Filter Out, V
OUT
= 2.5V
1.05
1.0
0.95
I
LEAK
Filter Out
Coast Mode, V
DD
> V
OUT
> 0V
-100
1
100
nA
NOTE:
1. All inputs to 0V, COAST floating.
AC Electrical Specifications
V
DD
= 5V, T
A
= 25C unless otherwise noted
Parameter
Conditions
Min
Typ
Max
Unit
VCO Gain @ 20MHz
Test circuit 1
15.5
dB
H
SYNC
S/N Ratio
V
DD
= 5V (Note 1)
35
dB
Jitter
VCXO oscillator
1
ns
Jitter
LC oscillator (Typ)
10
ns
NOTE:
1. Noisy video signal input to EL4583, H
SYNC
input to EL4585. Test for positive signal lock.
EL4585
4
FN7175.3
July 1, 2005
Pin Descriptions
Pin NUMBER
PIN NAME
FUNCTION
1, 2, 16
PROG A, B, C
Digital inputs to select N value for internal counter. See Table 1 for values.
3
OSC/VCO OUT
Output of internal inverter/oscillator. Connect to external crystal or LC tank VCO circuit.
4
VDD (A)
Analog positive supply for oscillator, PLL circuits.
5
OSC/VCO IN
Input from external VCO.
6
VSS (A)
Analog ground for oscillator, PLL circuits.
7
CHARGE PUMP
OUT
Connect to loop filter. If the H
SYNC
phase is leading or H
SYNC
frequency > CLK 2N, current is pumped
into the filter capacitor to increase VCO frequency. If H
SYNC
phase is lagging or frequency < CLK 2N,
current is pumped out of the filter capacitor to decrease VCO frequency. During coast mode or when
locked, charge pump goes to a high impedance state.
8
DIV SELECT
Divide select input. When high, the internal divider is enabled and EXT DIV becomes a test pin, outputting
CLK 2N. When low, the internal divider is disabled and EXT DIV is an input from an external N.
9
COAST
Three-state logic input. Low (< 1/3*V
CC
) = normal mode, Hi Z (or 1/3 to 2/3*V
CC
) = fast lock mode,
High (> 2/3*V
CC
) = coast mode.
10
HSYNC IN
Horizontal sync pulse (CMOS level) input.
11
VDD (D)
Positive supply for digital, I/O circuits.
12
LOCK DET
Lock detect output. Low level when PLL is locked. Pulses high when out of lock.
13
EXT DIV
External divide input when DIV SEL is low, internal 2N output when DIV SEL is high.
14
VSS (D)
Ground for digital, I/O circuits.
15
CLK OUT
Buffered output of the VCO.
TABLE 1. VCO DIVISORS
PROG A (PIN 16)
PROG B (PIN 1)
PROG C (PIN 2)
DIV VALUE (N)
0
0
0
1702
0
0
1
1728
0
1
0
1888
0
1
1
2270
1
0
0
1364
1
0
1
1716
1
1
0
1560
1
1
1
1820
EL4585
PDF 
ZIP
