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參數(shù)資料
| 型號： | TEA2028 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 6/47頁 |
| 文件大小： | 532K |
| 代理商： | TEA2028 |
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V - FUNCTIONAL DESCRIPTION
Majority of the on-chipanalogfunctionswere com-
puter simulated and results such as temperature
variation, technological characteristic dispersion
and stability, have led to the enhancement and
implementationof actuallyemployed structures.A
parallel in-depth study of the device implemented
in form of integrated sub-sections is provided to
analyze the overallperformancein a TVset.
V.1 - Internal Voltage and Current References
V.1.1 - 1.26V Voltagereference
For optimum operation of the device, an accurate
and temperature-stable voltage generator inde-
pendent from V
CC
variations is used (Band-gap
typegenerator).
The generated1.26V is particularlyused asrefer-
ence setting on input comparators.
V.1.1.1 - Generatorblock diagram
V
BE
I
T
V
BE
λ
A
λ
GENERATOR
-2mV/
°
C
T
+0.086mV/
°
C
dt
dV
O
= 0
V
O
V
BE
=
= 1.26V
+ A.
λ
Σ
2
Figure3
with
λ
=K
T
dT=K
dV
BE
dT
if A
λ
= 1.26 - V
BE
Then : V
O
= 1.26V (temperature-independant)
q
= 25.7mV at + 25
o
C
q= + 0.086mV/
o
C
=V
BE
(
25’
)
1.26
T
= - 2mV/
o
C
In practice,maximum drift dueto temperaturecan
be + 0.23mV/
o
C
i.e.,
±
1.5% for a
T of 80
o
C.
14
V
V
BE1
BE2
1.26V
Band
Gap
I
REF
I
14
R
EXT
3.32k
1%
V
CC
+
2
Figure 4
V.1.2 - Current reference
This is implemented using the 1.26V generator in
combinationwith an externalresistor.
I
REF
≈
I
14
=V
14
R
EXT
=1.26
+
V
BE1
V
BE2
Let’s I
14
= I andV
EB1
= V
BE2
then : I
REF
=1.26
R
EXT
= 380
μ
A
R
EXY
Thus, it follows that I
REF
is accurate and inde-
pendent of both V
CC
and temperature.
A set of current generators proportional to I
REF
current are used in variouscircuit blocks.
V.2 - Line Sync. Extraction
Horizontal and vertical time bases should be syn-
chronized with corresponding sync. pulses trans-
mittedinside theinfra-black portion ofvideo signal.
The duty of this stage is to extract these sync
pulses. The output signal, called composite sync,
contains the vertical sync which is transmitted by
simple inversion of line sync. pulses.
The vertical sync pulse is then extracted from this
compositesignal.
The main advantage of this arrangement is its
ability to operate at video input signal levels falling
within 0.2V to 3V peak-to-peak range and at any
average value.
The operating principle is to lock the black levelof
the inputsignal (Pin27)ontointernalyfixedvoltage
(V
N
) andthenmemorizetheaverage voltageofthe
sync pulse by using an integrating capacitor con-
nected to Pin 26.
Finally, the composite sync signal isdelivered by a
comparator the inputs of whichare driven by V
50%
and video signals.
TEA2028 - TEA2029APPLICATIONNOTE
6/46
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