EL4585C
Horizontal Genlock, 8 F
SC
e
e
25 C unless otherwise noted)
AC Electrical Characteristics (V
5V, T
§
DD
A
Test
Parameter
Conditions
Temp
Min
Typ
Max
Units
Level
@
VCO Gain 20 MHz
Test circuit 1
25 C
§
15.5
V
V
V
V
dB
dB
ns
e
H-sync S/N Ratio
Jitter
V
DD
5V (Note 2)
25 C
§
35
VCXO Oscillator
25 C
§
1
Jitter
LC Oscillator (Typ)
25 C
§
10
ns
Note 2: Noisy video signal input to EL4583C, H-sync input to EL4585C. Test for positive signal lock.
Pin Description
Pin No.
Pin Name
Function
N value for internal counter. See table below for values.
d
Digital inputs to select
16, 1, 2
Prog A,B,C
3
4
5
6
7
Osc/VCO Out
Output of internal inverter/oscillator. Connect to external crystal or LC tank VCO circuit.
Analog positive supply for oscillator, PLL circuits.
Input from external VCO.
V
(A)
DD
Osc/VCO In
(A)
V
SS
Analog ground for oscillator, PLL circuits.
l
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
d
Charge Pump
Out
k
d
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
9
Div Select
Divide select input. When high, the internal divider is enabled and EXT DIV becomes a test pin,
d
outputting CLK 2N. When low, the internal divider is disabled and EXT DIV is an input from an
d
external N.
k
e
e
fast lock mode,
Coast
Tri-state logic input. Low( (/3*V
)
CC
normal mode, Hi Z(or (/3 to )/3*V
)
CC
l
e
coast mode.
High( )/3*V )
CC
10
11
12
13
14
15
H-sync In
Horizontal sync pulse (CMOS level) input.
Positive supply for digital, I/O circuits.
V
DD
(D)
Lock Det
Ext Div
Lock Detect output. Low level when PLL is locked. Pulses high when out of lock.
d
External Divide input when DIV SEL is low, internal
Ground for digital, I/O circuits.
2N output when DIV SEL is high.
V
SS
(D)
CLK Out
Buffered output of the VCO.
Table 5. VCO Divisors
Prog A
Pin 16
Prog B
Pin 1
Prog C
Pin 2
Div Value
N
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1702
1728
1888
2270
1364
1716
1560
1820
3
ELANTEC [ ELANTEC SEMICONDUCTOR ]
