CA3126 Intersil Corporation, CA3126 Datasheet - Page 8

• Manufacturer Part Number: CA3126
• Description: Tv Chroma Processor
• Manufacturer: Intersil Corporation

curve of the typical static phase error as a function of the free-
running oscillator frequency is shown in Figure 2. It should be
noted that the slope of the curve determines the DC gain of the
phase-locked loop, i.e., 40Hz per degree.
Thermal Considerations
The circuit of the CA3126 is thermally compensated to achieve
the optimal operating characteristics over the normal operating
temperature range of TV receivers. Figures 3 and 4 show the
oscillator and chroma-output amplitudes and phases as a func-
tion of temperature (Terminals 8 and 15), respectively.
Both the oscillator and chroma-output amplitudes and
phases are measured relative to the chroma-input phase.
The performance of the oscillator free-running frequency as
a function of temperature is shown in Figure 5. All the tem-
perature plots are characteristic of the test circuit with the
indicated component types and values given.
FIGURE 3. AMPLITUDE AND PHASE VARIATIONS OF
110
100
90
80
70
60
-2
-4
-50
6
4
2
0
-300
CHROMA INPUT = 0.25V
T
A
= 25
OSCILLATOR OUTPUT vs TEMPERATURE
-25
-200
PHASE
FIGURE 2. STATIC PHASE ERROR
OSCILLATOR FREE-RUNNING FREQUENCY
o
(DEVIATION IN Hz FROM 3.579545MHz)
C
-100
AMPLITUDE
TEMPERATURE (
0
P-P
0
25
, 3.58MHz CW SIGNAL
100
o
50
C)
200
75
300
100
0
-5
-10
400
CA3126
8-40
FIGURE 4. AMPLITUDE AND PHASE VARIATIONS OF
FIGURE 5. VARIATION OF OSCILLATOR FREE RUNNING
140
130
120
110
100
90
80
-100
-150
100
-50
-50
50
0
-50
CHROMA INPUT = 0.25V
3.58MHz CW SIGNAL
CHROMA INPUT = 0V
CHROMA OUTPUT vs TEMPERATURE
FREQUENCY vs TEMPERATURE
-25
-25
AMPLITUDE
TEMPERATURE (
0
0
PHASE
TEMPERATURE (
P-P
P-P
25
25
,
o
50
50
C)
o
C)
75
75
100
100
15
10
5
0
-5
-10
-15
125