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TEA2028 数据表(PDF) 1 Page - STMicroelectronics

部件名 TEA2028
功能描述  APPLICATION NOTE
PDF  47 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TEA2028 数据表(HTML) 1 Page - STMicroelectronics

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APPLICATION NOTE
TEA2028 - TEA2029
AN407/0594
By : J-M. MERVAL & B. D’HALLUIN
SUMMARY
Page
TEA2028
I
GENERAL DESCRIPTION ... ... .. .... ... ... . . . .... ... ... .. . . . . . . . . . . ....
3
II
MAIN FUNCTIONS . . . . . . . . . ... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... .. .
4
III
PIN CONNECTION (TEA2028B) . . . . . . . . . . . . . . . . . . . . . . . . . . ... ... ... .... ...
4
IV
INTERNAL BLOCK DIAGRAM . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
5
V
FUNCTIONAL DESCRIPTION ... .. .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
6
V.1
INTERNAL VOLTAGE AND CURRENT REFERENCES . .... ... . ... . . . . . . . . ....
6
V.1.1
1.26V Voltage Reference . . . . . . . . . .... ... .... .. . . . . . . . ... .. . . . . . . . . . . . . . .
6
V.1.1.1
Generator block diagram. . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
6
V.1.2
Current Reference. . . . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
6
V.2
LINE SYNC. EXTRACTION . .... .. . . . . . . . . . . . . . . . . . . . . . . . ... ... ... ... . . . .
6
V.2.1
Black Level Locking . . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
7
V.2.1.1
Application. . . . .... ... ... .. . . . . ... ... ... .... ... ... ... ... ... ... .... ...
7
V.2.2
Memorizing the Sync Pulse 50% Value . . . . . . . . . . . . . . . . . . . . . ... ... ... .... ...
8
V.2.2.1
IC
ID
Ratio calculation . . . . . . . . . . . . .... ... ... . . . .... ... ... .. . . . . . . . . . . . . . .
8
V.2.3
Sync Pulse Detection . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
9
V.3
FIRST PHASE LOCKED-LOOP STAGE ”
φ1” .. .. .. .. ... ... . . . . .. .. .. . . . . . . ...
9
V.3.1
Phase Locked-loop ”
φ1” Block Diagram . .... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
9
V.3.2
Functional Duty of Individual Blocks . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
10
V.3.2.1
Phase comparator. .... ... ... .. .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
10
V.3.2.2
Low-pass filter . . . . .... ... ... .. ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . .
10
V.3.2.3
VCO centered on 500kHz . .... .. .... ... ... . . . . . . . . . . ... .. . . . . . . . . . . . . . .
10
V.3.2.4
Divider stage . . . . . .... ... ... .. .... .... . . . . . . . . . . . .... .. . . . . . . . ... . . . .
10
V.3.3
Functional Description of Building Blocks . . . . . . . . . . . . . . . . . . . . ... ... ... .... .. .
10
V.3.3.1
Phase comparator ”
φ1” ... . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
10
V.3.3.2
Low-pass filter . . . . .... ... ... .. ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . .
11
V.3.3.3
VCO (Voltage Controlled Oscillator) . . . . . . . . . .... ... ... ... ... ... ... .... ...
11
a. 503kHz Ceramic Filter. . .... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... ...
11
b. Simplified Block Diagram of VCO . . . . . . . . . .... ... .. . . .. ... ... ... .... ...
12
c. Characteristics of the External Filter . . . . . . . . . . .... ... ... .. . . . . . . . . . . ....
12
d. Study of the Internal Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . ... ... ... .... .. .
13
e. Characteristics of the non-linear Amplifier ”A4” . . . . . . . . . . . . ... ... ... ... . . . .
14
f. Voltage-frequency transfer characteristics of VCO . . . . . . . . . . . . . . . . . . .... ...
14
V.3.4
”
φ1” Time Constant Switching .... .. . . . . . . . . . . . . . . . . . . . . . . . ... ... ... ... . . . .
14
V.3.5
Video Identification Stage . . . . . . . . . .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
15
V.3.5.1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... .... . . . ...
15
V.3.6
Characteristics of Loop
φ1.... ... .. .... . . . . . . . . . . . . . . . .... .. . . . . . . . ... . . . .
15
V.3.6.1
Locking accuracy. . . . . . . . . . . . . . . . . . . . . . . . .... ... .. . . .. ... ... ... .... ...
15
V.3.6.2
Dynamic study. . . . . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
16
a. Long time constant . .... ... .. .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . .
16
b. Short time constant . .... ... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... .. .
16
V.3.7
Phase Comparator Inhibition. .... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... .. .
17
1/46


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