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Электронный компонент: U4935B

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U4935B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
1 (16)
SECAM Decoder
Description
The U4935B is an SECAM decoder designed for use with
the PAL/NTSC TV baseband processor U4930B and the
baseband delay line U3665M.
The circuit includes a bell filter, a demodulator and an
identification circuit. A signal with stable reference fre-
quency for calibration and a three-level sandcastle pulse
for blanking and burst gating are required.
The IC is realized in a bipolar VLSI technology and
operates with +8 V supply voltage. Easy interfacing and
few external components support the design of a
multistandard TV.
Features
D Fully integrated and auto-tuned filters
D Minimum number of external components
D Easy interfacing with the TV baseband processor and
the switched capacitor baseband delay line
Package
16-pin dual in-line plastic (DIP16)
Block Diagram
Bandgap
Bell
filter
ACC
AMP
2
PLL
12
13
Bell-filter
tuning
Ident
Interface
PLL
tuning
Pulse
gen.
De
emphasis
B Y
output
R Y
output
SECAM
sw.
10
4
9
Band
gap
(BY)
out
(RY)
out
1
5
8
15
6
14
11
f
ref
/
ident
Killer
out
PLL
ref
0.47
SCP
in
GND
Black
adj. R
Black
adj. B
16
7
Bell
filter
ref
CVBS
in
Bell filter
out
0.1
PLL
auto2
PLL
auto1
3
0.1
22
V
S
= 8 V
96 11715
F
m
F
m
F
m
F
m
Figure 1. Block diagram
Ordering Information
Extended Type Number
Package
Remarks
U4935B-ADP
DIP16
U4935B
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
2 (16)
Pin Description
Pin
Symbol
Function
1
f
ref
/ ident
f
ref
/ ident
2
Bell out
Bell-filter output
3
V
S
8-V supply voltage
4
Band gap
Band-gap reference voltage
5
Killer out
SECAM killer output
6
GND
Ground
7
Bell
ref
Bell-filter reference
*
voltage output
8
PLLref
PLL reference
9
(RY)
(RY) output
10
(BY)
(BY) output
11
Black adj. B Black level adjust B - channel
12
PLL
1
PLL auto 2
13
PLL
2
PLL auto 1
14
Black adj. R Black-level adjust R - channel
15
SCP
Sandcastle pulse input
16
CVBS
CVBS input
16
15
14
13
1
2
3
4
U4935B
12
11
10
5
6
7
9
8
V
S
9611726
fref / ident
Bell filter
output
Band gap
SECAM
killer out
GND
Bell filter
ref
PLL ref
CVBS input
SCP input
Black adj. R
PLL auto 1
PLL auto 2
Black adj. B
(BY) output
(RY) output
Figure 2. Connection diagram
Absolute Maximum Ratings
V
S
= 8 V, T
amb
= 25
C, reference point Pin 6, unless otherwise specified
Test conditions: V
pin 1
= 4.75 V, V
pin 16
= 4 V, unless otherwise specified
Parameters
Symbol
Value
Unit
Supply voltage
Pin 3
VS
8.0
V
Junction temperature
T
j
125
C
Storage temperature range
T
stg
40 to +125
C
Electrostatic handling*)
all Pins
V
ESD
"200
V
*) Equivalent to discharging a 200 pF capacitor via a 0-
W resistor
Operating Range
Parameters
Symbol
Value
Unit
Supply voltage range
Pin 3
V
S
7.5 to 8.5
V
Ambient temperature
T
amb
20 to +70
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient (when soldered to PCB)
R
thJA
80
K/W
U4935B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
3 (16)
0
250
500
750
1000
1250
1500
0
25
50
75
100
125
150
Power dissipation Pd ( mW
)
Ambient temperature T
amb
(
C )
96 11702
Figure 3. Thermal derating curve of the package
(maximum rating)
Electrical Characteristics
V
S
= 8 V, T
amb
= 25
C, reference point Pin 6, unless otherwise specified
Test conditions: V
pin 1
= 4.75 V, V
pin 16
= 4 V, unless otherwise specified
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
DC supply
Supply voltage V
S
Pin 3
V
S
7.5
8.0
8.5
V
Supply current I
S
Pin 3
Note 1
I
S
18
24
30
mA
Bell filter
Resonance frequency
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
BO
4.236
4.286
4.336
MHz
Bandwidth
f = 4.0 - 5.0 MHz sweep
signal with 20 mV
peak-to-peak amplitude at
the CVBS input, Pin 2
f
BW
250
320
368
kHz
Demodulator
Output DC level during blanking
Pins 9 and 10
V
O
2.1
2.8
3.5
V
Black level error (RY)
Black/ white signal at the
CVBS input
(see note 4, page 5), Pin 9
DV
RB
15
+15
mV
Black level error (BY)
Black/ white signal at the
CVBS input
(see note 4, page 5), Pin 10
DV
BB
50
+20
mV
(RY) output signal amplitude
(peak-to-peak value)
(see note 1, page 5), Pin 9
V
RY
0.85
1.0
1.15
V
(BY) output signal amplitude
(peak-to-peak value)
(see note 1, page 5), Pin 10
V
BY
1.05
1.24
1.36
V
U4935B
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
Preliminary Information
4 (16)
Unit
Max.
Typ.
Min.
Symbol
Test Conditions / Pins
Parameters
Ratio of (BY)/(RY) output
signal amplitude
V
BY
/V
B
Y
1.10
1.24
1.36
Linearity
(see notes 1 and 3, page 5)
Pin 10
V
LIN
2.6
2.9
3.2
Sandcastle pulse (see figures 16 and 17)
Vertical blanking detection level
Pin 15
V
VB
1.0
1.25
1.4
V
Horizontal blanking detection level
Pin 15
V
HB
1.75
2.0
2.25
V
Burst-gate detection level
Pin 15
V
BG
3.5
3.85
4.2
V
Reference/ Identification
Reference frequency
During vertical blanking
(see figure 4, 300 mVpp)
Pin 1
f
ref
4.4336
MHz
System switches detection level
(at SECAM)
V
ext1
= variable
(see figure 6),
Pin 1
V
TH1
2.9
3.3
V
System switches detection level
(at no SECAM)
V
ext1
= variable
(see figure 6),
Pin 1
V
TH2
1.5
2.0
V
Sink current (at SECAM)
(see note 5, page 5), Pin 1
125
180
235
mA
Pin 5 voltage (at SECAM)
(see note 1, page 5), Pin 5
V
5S
2.4
3.1
3.6
V
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)
Pin 16
V
DR
1.0
1.4
V
Chrominance input voltage
(peak-to-peak value)
(see note 7, page 5), Pin 16
V
CL
167
300
mV
Pole frequency of the de-emphasis
LPF
f
p
85
kHz
Ratio of the pole and zero
frequency
f
p
/f
o
3
(RY), (BY) output impedance
(at SECAM)
Pins 9 and 10
Z
o1
200
600
W
(RY), (BY) output impedance
(at no SECAM)
Pins 9 and 10
Z
o2
1
M
W
Reference voltage amplitude
(peak-to-peak value)
(see note 8, page 5), Pin 1
V
ref
0.2
0.57
V
Rising edge of SECAM burst-gate
pulse (internal generated)
(see note 9, page 5)
T
r
4.5
ms
Falling edge of SECAM burst-gate
pulse
(see note 10, page 5)
T
f
0.2
ms
U4935B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
5 (16)
Notes:
1. CVBS input: 100/75 color bar signal. The (BY) burst signal [f
OB
] amplitude is 167 mVpp (= 0 dB).
2. Measure during scanning. An active probe is recommended for low capacitive loading.
3. Defined as V
LIN
= b / a (see figure 4).
4. Measure the difference between the blanking (V
1
) and the black level (V
2
) (see figure 5).
DV
RB
= V
2
- V
1
(Pin 9),
DV
BB
= V
2
- V
1
(Pin 10)
a
b
96 11719
Figure 4. V
LIN
96 11720
V2
V1
Figure 5. Black level error at Pin 9 (RY)
5. The external voltage at Pin 1 should exceed 0.5 V.
6. V
K
(peak-to-peak value of the burst signal in a blue line) when "LOW" (0.2 V) at Pin 5 related to 167 mV
PP
( = 0 dB)
I / K = 20
log
10
(V
K
/
167 m V) [dB]
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.