U4935B-ADP [TEMIC]
SECAM Decoder; SECAM解码器
| 型号： | U4935B-ADP |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | SECAM Decoder |
| 文件： | 总16页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U4935B
SECAM Decoder
Description
The U4935B is an SECAM decoder designed for use with for blanking and burst gating are required.
the PAL/NTSC TV baseband processor U4930B and the The IC is realized in a bipolar VLSI technology and
baseband delay line U3665M.
operates with +8 V supply voltage. Easy interfacing and
The circuit includes a bell filter, a demodulator and an few external components support the design of a
identification circuit. A signal with stable reference fre- multistandard TV.
quency for calibration and a three-level sandcastle pulse
Features
Package
Fully integrated and auto-tuned filters
16-pin dual in-line plastic (DIP16)
Minimum number of external components
Easy interfacing with the TV baseband processor and
the switched capacitor baseband delay line
Block Diagram
VS = 8 V
0.1
F
0.1 F
Bell filter
out
F
22
PLL
auto2
PLL
auto1
2
13
12
3
Band
gap
4
Bandgap
16
7
CVBS
in
Bell
filter
AMP
ACC
PLL
Bell
filter
ref
10
9
– (B–Y)
out
B –Y
output
De–
emphasis
Bell-filter
tuning
SECAM
sw.
Ident
PLL
R –Y
output
– (R–Y)
out
Pulse
gen.
Interface
1
tuning
5
11
15
6
GND
14
Black
8
PLL
ref
96 11715
SCP
in
f
/
Killer
out
ref
Black
adj. B
ident
adj. R
0.47 F
Figure 1. Block diagram
Ordering Information
Extended Type Number
Package
DIP16
Remarks
U4935B-ADP
TELEFUNKEN Semiconductors
1 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Pin Description
Pin
1
2
3
4
5
6
7
Symbol
Function
fref / ident
f
/ ident
f
/ ident
ref
CVBS input
16
1
2
3
4
5
6
7
8
ref
Bell out
Bell-filter output
8-V supply voltage
V
S
Bell filter
output
15 SCP input
Band gap Band-gap reference voltage
Killer out SECAM killer output
V S
Black adj. R
PLL auto 1
GND
Bell
Ground
14
13
12
Bell-filter reference
voltage output
PLL reference
–(R–Y) output
–(B–Y) output
ref
Band gap
8
9
10
PLLref
–(R–Y)
–(B–Y)
U4935B
SECAM
killer out
PLL auto 2
11 Black adj. B Black level adjust B - channel
12
13
14 Black adj. R Black-level adjust R - channel
15
16
PLL
PLL
PLL auto 2
PLL auto 1
1
2
11 Black adj. B
GND
Bell filter
ref
SCP
CVBS
Sandcastle pulse input
CVBS input
10
– (B–Y) output
PLL ref
9
– (R–Y) output
9611726
Figure 2. Connection diagram
Absolute Maximum Ratings
V = 8 V, T
= 25°C, reference point Pin 6, unless otherwise specified
S
amb
Test conditions: V
= 4.75 V, V
= 4 V, unless otherwise specified
Symbol
pin 1
pin 16
Parameters
Value
8.0
Unit
V
Supply voltage
Pin 3
VS
Junction temperature
Storage temperature range
Electrostatic handling*)
T
125
–40 to +125
200
°C
°C
V
j
T
stg
all Pins
V
ESD
*) Equivalent to discharging a 200 pF capacitor via a 0- resistor
Operating Range
Parameters
Symbol
Value
7.5 to 8.5
–20 to +70
Unit
V
°C
Supply voltage range
Ambient temperature
Pin 3
V
S
T
amb
Thermal Resistance
Parameters
Junction ambient (when soldered to PCB)
Symbol
R
thJA
Value
80
Unit
K/W
2 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
1500
1250
1000
750
500
250
0
0
25
50
75
100
125
150
96 11702
Ambient temperature T
( °C )
amb
Figure 3. Thermal derating curve of the package
(maximum rating)
Electrical Characteristics
V = 8 V, T
= 25°C, reference point Pin 6, unless otherwise specified
S
amb
Test conditions: V
= 4.75 V, V
= 4 V, unless otherwise specified
pin 1
pin 16
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max. Unit
DC supply
Supply voltage V
Pin 3
Pin 3
V
7.5
18
8.0
24
8.5
30
V
mA
S
S
Supply current I
I
S
S
Note 1
Bell filter
Resonance frequency
Bandwidth
f = 4.0 - 5.0 MHz sweep
signal with 20 mV
peak-to-peak amplitude at
the CVBS input
(see note 2, page 5), Pin 2
f = 4.0 - 5.0 MHz sweep
signal with 20 mV
f
4.236 4.286 4.336 MHz
BO
f
250
320
2.8
368
kHz
BW
peak-to-peak amplitude at
the CVBS input,
Pin 2
Demodulator
Output DC level during blanking
Black level error –(R–Y)
Pins 9 and 10
Black/ white signal at the
CVBS input
V
V
2.1
3.5
V
O
–15
+15
mV
RB
(see note 4, page 5), Pin 9
Black level error –(B–Y)
Black/ white signal at the
CVBS input
V
BB
–50
+20
mV
(see note 4, page 5), Pin 10
–(R–Y) output signal amplitude
(peak-to-peak value)
–(B–Y) output signal amplitude
(peak-to-peak value)
(see note 1, page 5), Pin 9
(see note 1, page 5), Pin 10
V
0.85
1.05
1.0
1.15
1.36
V
V
R–Y
V
B–Y
1.24
TELEFUNKEN Semiconductors
3 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Parameters
Ratio of –(B–Y)/–(R–Y) output
signal amplitude
Test Conditions / Pins
Symbol
Min.
1.10
Typ.
1.24
Max.
1.36
Unit
V /V
B–Y B–
Y
Linearity
(see notes 1 and 3, page 5)
V
LIN
2.6
2.9
3.2
Pin 10
Sandcastle pulse (see figures 16 and 17)
Vertical blanking detection level
Horizontal blanking detection level
Burst-gate detection level
Pin 15
Pin 15
Pin 15
V
VB
V
HB
V
BG
1.0
1.75
3.5
1.25
2.0
3.85
1.4
2.25
4.2
V
V
V
Reference/ Identification
Reference frequency
During vertical blanking
(see figure 4, 300 mVpp)
f
4.4336
MHz
ref
Pin 1
Pin 1
Pin 1
System switches detection level
(at SECAM)
System switches detection level
(at no SECAM)
V
= variable
V
V
2.9
2.0
3.3
V
V
ext1
TH1
(see figure 6),
V
= variable
1.5
ext1
TH2
(see figure 6),
Sink current (at SECAM)
Pin 5 voltage (at SECAM)
(see note 5, page 5), Pin 1
(see note 1, page 5), Pin 5
125
2.4
180
3.1
235
3.6
A
V
V
5S
Sensitivity of identification and
killer
Attenuate the amplitude
(see notes 1 and 6, page 5)
Pin 5
I/K
–46
–38
–32
dB
Unspecified characteristics (only for reference but not guaranteed limiting values)
Input dynamic range
(peak-to-peak value)
Chrominance input voltage
(peak-to-peak value)
Pole frequency of the de-emphasis
LPF
Pin 16
V
1.0
167
85
1.4
V
DR
(see note 7, page 5), Pin 16
V
300
mV
kHz
CL
f
p
Ratio of the pole and zero
frequency
f /f
p
3
o
–(R–Y), –(B–Y) output impedance
(at SECAM)
–(R–Y), –(B–Y) output impedance
(at no SECAM)
Pins 9 and 10
Pins 9 and 10
Z
Z
200
600
o1
1
M
V
s
o2
Reference voltage amplitude
(peak-to-peak value)
Rising edge of SECAM burst-gate
pulse (internal generated)
Falling edge of SECAM burst-gate
pulse
(see note 8, page 5), Pin 1
(see note 9, page 5)
V
0.2
0.57
ref
T
4.5
0.2
r
(see note 10, page 5)
T
s
f
4 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Notes:
1. CVBS input: 100/75 color bar signal. The (B–Y) burst signal [f ] amplitude is 167 mVpp (= 0 dB).
OB
2. Measure during scanning. An active probe is recommended for low capacitive loading.
3. Defined as V
= b / a (see figure 4).
LIN
4. Measure the difference between the blanking (V ) and the black level (V ) (see figure 5).
1
2
V
RB
= V - V (Pin 9),
V = V - V (Pin 10)
BB 2 1
2
1
V2
V1
a
b
96 11720
96 11719
Figure 4. VLIN
Figure 5. Black level error at Pin 9 (R–Y)
5. The external voltage at Pin 1 should exceed 0.5 V.
6. V (peak-to-peak value of the burst signal in a blue line) when “LOW” (0.2 V) at Pin 5 related to 167 mV (= 0 dB)
K
PP
I / K = 20 log (V / 167 m V) [dB]
10
K
7. Measured in the burst period of a blue line
8. The reference frequency should be stable during the vertical blanking
9. Defined as the time from rising edge of the sandxastle burst-gate pulse at Pin 15.
10. Defined as the time from falling edge of the sandxastle burst-gate pulse at Pin 15.
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
5 (16)
Preliminary Information
U4935B
Internal Pin Configuration
V
9611727
CC
A
300
2 W
4.3 V
1
2.8 V
4.3 V
13 k
5
100
10 pF
18 k
15.1 k
20 k
2 k
2 k
96 11730
96 11733
Figure 9. SECAM killer output
A
100
7
Figure 6. fref / ident
V
CC
100
2
20 k
A
100
20 k
A
100
96 11728
Figure 7. Bell-filter output
Figure 10. Bell-filter reference
8
VCC
2 k
2 k
4
1.8 k
A
200
12.6 k
96 11734
9 k
96 11729
Figure 11. PLL reference
Figure 8. Band gap
6 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Internal Pin Configuration (continued)
96 11738
9, 10
A
A
A
50
50
50
A
230
15
96 11735
100
Figure 12. –(R–Y), –(B–Y) output
14
Figure 15. Sandcastle input
4
4.3 V
670
13 pF
2.8 V
225
2.5 k
16
8.1 k
8.1 k
1.11 k
100 A
A
200 A
200
13.6 k
96 11739
11
96 11736
Figure 16. CVBS input
Figure 13. Black level adjust –(B–Y), –(R–Y) channel
12
13
A
A
200
200
96 11737
Figure 14. PLL auto 1, 2
TELEFUNKEN Semiconductors
7 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Functional Description
Bell Filter
The ACC amplifier provides a C- (chrominance) signal of The reference frequency should be stable during the verti-
a constant peak-to-peak level for the bell filter. The bell cal blanking because it is used to calibrate the filters and
filter is of a gyrator-capacitor type. The resonance the demodulator. The capacitor C7 should be connected
frequency is
as close as possible to the ground Pin of the package. If
not, this can result in a resonance frequency error.
4.433619 MHz
4.286 MHz
4.33 MHz
during vertical blanking
during scanning
during burst gating.
CVBS
in
VBLK pulse
ACC
16
PLL
Bell filter
f
/
ref
ident
Tuning
7
Amp
1
C7
Gain
fo
f
ref
4.434 MHz
f
4.286 MHz
9611724
Figure 17. Block diagram of the bell filter
8 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Demodulator
The bell filter delivers the C signal via a limiter amplifier Therefore, the IC needs no adjustment to enable constant
to the demodulator. The demodulator is of a phase-locked operation
loop (PLL) type VCO and a phase-emitter coupled
The low-frequency de-emphasis is matched to the PLL
multivibrator with the limiter output and is fed back to the
and is controlled by the tuning voltage of the PLL.
VCO. The free-running frequency is adjusted by charging
The capacitor, C8, should be connected as close as
or discharging the capacitor at Pin 8 during the vertical
possible to the ground pin of the package. If this is not
blanking and is held during scanning.
ensured, a black-level error for both channels may result.
VBLK pulse
De–
emphasis
to H,
V blanking
Bell-filter
Limiter
LPF
output
VCO
PLL
Tuning
PLL
ref
8
C8
9611721
Figure 18. Block diagram of the demodulator
TELEFUNKEN Semiconductors
9 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Identification
The identification circuit is a quadrature-type FM U4930B (PAL/NTSC decoder) to guarantee that the out-
demodulator which uses the bell filter as a phase shifter. put signal from the decoder is available when no PAL
The resonance frequency of the phase shifter is adjusted signal has been identified.
to 4.33 MHz i.e., the frequency between the 4.25-MHz
If a SECAM signal has been decoded, a request for
(B–Y) carrier and the 4.40625-MHz (R–Y) carrier
“color on” is transmitted to Pin 1 (current sink: 180 A).
during burst gating. The output of the ACC is multiplied
If the signal request is grated (i.e., Pin q is “HIGH”
with the output of the phase shifter. The sample-and-hold
therefore no PAL), the output signals from the U4935B
circuit samples the output of the multiplier during burst
are switched on and the output pins of the U4930B have
a high impedance.
gating and maintains this value outside of the burst-gate
pulse time. The identification and killer detectors
compare the sampled-and-hold voltage with internal
If no SECAM signal has been decoded, the outputs of the
detection levels. Only line identification (and no field
U4935B will be blanked or have high-impedance state
identification) is implemented.
depending on the logic level at Pin 1.
The identification circuit must communicate with the (see table 1)
System Identification of
the U4930B
Logic Level; Pin 1 of
the U4935B
SECAM Identification of
the U4935B
Output Pins 9, 10 of
the U4935B
SECAM; 180 A
no SECAM; 0 A
SECAM; 180 A
no SECAM; 0 A
(–R–Y), –(B–Y) signals
Blanked
No PAL
PAL
HIGH (5.0 V)
LOW (1.5 V)
High impedance
CVBS
in
Bell
filter
Bell-filter
output
ACC
16
VBLK
BGP
fH
2
S / H
Identification
detector
output
Killer
detector
output
9611722
Figure 19. Block diagram of the identification
10 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
SECAM Switch, Output Stage
The de-emphasis circuit provides the color-difference The (B–Y) signal is then amplified 3.8 times and
signals which are blanked during the horizontal and available at Pin 10 after reversing. The (R–Y) signal is
vertical blanking pulses. After blanking, the color amplified 2.54 times and available at Pin 9. When the
difference signals are switched every (B–Y) and (R–Y) logic level at Pin 1 is “LOW”, the outputs have
line by the SECAM switch.
high-impedance state.
3.85 V
2.0 V
BGP : 3.85 V
HBLK : 2.0 V
VBLK : 1.25 V
1.25 V
Pin 15
SCP in
f
= 4.433619 MHz
0.2 ~ 0.5 Vp–p
ref
Pin 1
f
ref
/ ident
5.0 VDC at SECAM
1.5 VDC at no SECAM
Pin 9
– (R–Y) out
Pin 10
– (B–Y) out
96 11718
Figure 20. Timing waveforms of the output stage
TELEFUNKEN Semiconductors
11 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Sandcastle Pulse
The required blanking burst and f pulses are derived from a three-level sandcastle pulse.
H/2
(see figures 16 and 17)
3.85 V
2.0 V
1.25 V
Pin 15
SCP in
HBLK
F/F
(fH/2 pulse)
125
s
VBLK
SECAM sw
SECAM sw
96 11716
Pin 15 SCP detection level :
BGP : 3.85 V
HBLK : 2.0 V
VBLK : 1.25 V
Figure 21. Timing chart of the internal pulses
0.2
s
Pin 15
SCP in
SECAM
BGP
4.5
s
95 11717
Figure 22. Timing chart of the internal SECAM burst gating pulse
12 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Typical Voltages
Pin
Function
DC Voltage Comment
For the - reference input,
- PAL system identification input,
- SECAM killer-signal output.
180 A typ. at SECAM
1
f
/ ident
ref
0 A typ. at no SECAM
System switches detection level = 2.9 V.
2
3
4
5
Bell-filter output
1.7 V
8 V
Supply voltage
Bell-filter ref. voltage output
SECAM killer output
4.3 V
3.1 V
0 V
When SECAM
When no SECAM
6
7
8
Ground
Bell-filter reference
PLL reference
3.3 V
4.3 V
The capacitor should be connected as close as
possible to the ground pin of the package.
9
–(R–Y) output
2.8 V
2.8 V
4.16 V
5.0 V
1.0 V (peak-to-peak value) when the color-bar
signal at Pin 16 is 100/75.
10 –(B–Y) output
1.24 V (peak-to-peak value) when the color-bar
signal at Pin 16 is 100/75
11 Black level adjust B - channel
12 PLL auto 2
Black-level error can be compensated by an
external resistor
Capacitor between Pin 12 and Pin 13 improves
color S/N ratio. The value of the capacitor is typ.
0.1 F.
13 PLL auto 1
5.0 V
Capacitor between Pin 12 and Pin 13 improves
color S/N ratio. The value of the capacitor is typ.
0.1 F.
14 Black level adjust R - channel
4.28 V
Black-level error can be compensated by an
external resistor
15 Sandcastle-pulse (SCP) input
16 CVBS input
2.05 V
TELEFUNKEN Semiconductors
13 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
VS
10 F
SCP input
A
F
0.1
5 k
2 k
R
R
R
B
V
ext16
= 4 V
16
14
13
11
10
9
15
12
U4935B
1
2
3
5
6
4
7
8
VS
sw5
0.47 F
150 pF
F
0.1
F
f
0.47
F
22
ref
Vext5
=1.5 V
5 k
8.2 k
VS= 8 V
V
ext1
96 11725
Figure 23. Basic application circuit
14 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Package Information
20.0 max
19.8 max
Package DIP16
Dimensions in mm
7.82
7.42
4.8 max
0.5 min
6.4 max
3.3
0.39 max
1.64
1.44
0.58
0.48
9.75
8.15
2.54
17.78
Alternative
16
15
14
13
12
11
10
9
technical drawings
according to DIN
specifications
96 11709
1
2
3
4
5
6
7
8
TELEFUNKEN Semiconductors
15 (16)
Rev. A1, 28-Jan-97
Preliminary Information
U4935B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
16 (16)
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
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