STV8224A
MULTISTANDARD VIDEO AND SOUND IF SYSTEM
WITH AUDIO AND VIDEO SWITCHES
May 1995
PRELIMINARY DATA
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
24
23
22
21
11
12
TUNER AGC STARTING POINT ADJUSTMENT
TUNER AGC OUTPUT
AGC CAPACITOR
AGC CAPACITOR (L STANDARD)
IF INPUT
IF INPUT
GROUND
V
EXTERNAL AUDIO INPUT
FM DEMODULATED AUDIO OUTPUT
AUDIO SWITCH OUTPUT
VOLUME CONTROL + MUTE
CC
PIF PLL FILTER
AFC OUTPUT
CVBS OUTPUT
SWITCHING INPUT (STANDARD + INT/EXT)
IF LC
IF LC
AUDIO HIGH PASS FILTER
2nd IF SOUND INPUT
2nd IF DECOUPLING + MUTE
INTERNAL VIDEO INPUT
VIDEO SWITCH OUTPUT
EXTERNAL VIDEO INPUT
8224A-01.EPS
PIN CONNECTIONS
SHRINK24
(Plastic Package)
ORDER CODE : STV8224A
.
VIDEO PLL DEMODULATION
.
SOUND PLL DEMODULATION
.
POSITIVE AND NEGATIVE MODULATION
.
AGC FOR BG AND L STANDARDS
.
AUDIO SWITCH
.
DC VOLUME CONTROL
.
VIDEO SWITCH
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without no tice.
DESCRIPTION
The STV8224Ais a picture and sound IF processor
for multistandard application with very few external
components and adjustments.
It provides the audio and video switches for one
SCART plug application.
AM sound demodulation is performed with the
STV8225 add-on.
1/12
TUNER
AGC
OUTPUT
AFC
OUTPUT
EXT
CVBS
SWITCHED
CVBS
CVBS
OUT
SWITCHED
AUDIO
STV8224A
Int/Ext
BG/L
SFE
6.5
SFE
5.5
AUDIO
OUT
EXT
AUDIO
IF INPUT
19
16
20
21
22
23
24
14
13
15
7
4
8
9
11
10
3
18
17
12
5
1
6
2
PIF PLL
& AFC
VID
AMP
6dB
V
CC
WHITE NOISE
&
SPOT INVERT
LOGIC
INTERFACE
LIMITER
& MUTE
SIF
PLL
DC
VOLUME
TUNER
AGC
AGC
8224A-02.EPS
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
13.5
V
Vx
Tuner AGC Voltage
V
CC
V
T
stg
Storage Temperature
-40, +150
o
C
T
oper
Operating Temperature
0, +70
o
C
8224A-01.TBL
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction-ambient Thermal Resistance
Max.
75
o
C/W
8224A-02.TBL
STV8224A
2/12
ELECTRICAL CHARACTERISTICS
(T
amb
= 25
C, V
CC
= 9V, IF input = 10mV
RMS
sync level at B/G, Peak-white level at L,
Video modulation DSB, D = 90% at B/G, D = 95% at L, f
PC
= 38.9MHz, f
SC
= 33.4MHz,
Video BW = 5MHz, Sound carrier input : 5.5MHz, 10mV
RMS
, f
M
= 1kHz, Audio BW = 20kHz,
f =
50kHz,
Volume attenuation = 0dB, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
SUPPLY
V
CC
Supply Voltage
8
9
12.6
V
I
CC
Supply Current
I
17
, V
CC
= 9V
70
95
mA
IF AMPLIFIER
V
19-20
Input Sensitivity (RMS)
-3dB Video at Output
70
V
RMS
R
19-20
Differential Input Resistance
1.5
k
C
19-20
Differential Input Capacitance
2
pF
Gr
Gain Control Range
64
dB
Max Input Signal
+1dB Video at Output
110
mV
RMS
SYNCHRONOUS VIDEO DEMODULATOR
DF
PC
Vision Carrier Capture
-1.4
1.6
MHz
AFC
S2
AFC Slope
See Figure 21
0.2
A/kHz
DEMODULATED VIDEO OUTPUT (Pin 3)
V
A3
Amplitude
Top Sync to White
2
2.3
2.6
V
PP
BG vs L
Amplitude Difference
10
%
V
S3
Top Sync Level
B/G and L
1.6
1.9
2.2
V
Zero Carrier Level
B/G
L
4.4
1.8
V
V
BW
Bandwidth
-3dB Video Signal
6
7
MHz
Dg
Differential Gain
6
8
%
Dp
Differential Phase
6
8
Degree
Vr3c
Residual Carrier Signal (RMS Value)
1
10
mV
Vr3h
Residual 2nd Harmonic (RMS Value)
1
10
mV
I
3
Internal Bias of Emitter Follower
3
5
mA
S/N
Signal to Noise Ratio
Note 1 - Weighted CCIR-567
53
58
dB
Intermodulation 1.07MHz
Note 2
52
dB
V
WTH
White Noise Threshold Voltage
4.85
V
V
WIL
White Noise Insertion Level
3.6
V
V
BTH
Black Noise Threshold Voltage
1.3
V
V
BIL
Black Noise Insertion Level
2.5
V
AGC CIRCUIT (BG MODE)
I
22CBG
Charging Current
550
950
1300
A
I
22DBG
Discharge Current
12
20
28
A
C/D
Charging/Discharging Ratio
45
Notes : 1.
S
N
=
20 log 10
V
out black white
V
N
(
mV
RMS
)
at BW = 5MHz
2. Video carrier relative level = 0dB, Chroma subcarrier level = -3.2dB, Sound carrier relative level = -20dB. AGC voltage (Pin 22)
is adjusted to get 1V
PP
signal on output (Pin 3).
8224A-03.TBL
STV8224A
3/12
ELECTRICAL CHARACTERISTICS (continued)
(T
amb
= 25
C, V
CC
= 9V, IF input = 10mV
RMS
sync level at B/G, Peak-white level at L,
Video modulation DSB, D = 90% at B/G, D = 95% at L, f
PC
= 38.9MHz, f
SC
= 33.4MHz,
Video BW = 5MHz, Sound carrier input : 5.5MHz, 10mV
RMS
, f
M
= 1kHz, Audio BW = 20kHz,
f =
50kHz,
Volume attenuation = 0dB, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ. Max.
Unit
AGC CIRCUIT (L MODE)
I
22CL
Charging Current
Note 3
2
3.3
4.5
mA
I
22DL
Discharge Current
0.3
A
I
22CL
+
Additional Charging Current
L in case of missing, VITS Pulses
and no White in Video Content
5
A
Threshold Voltage Level for
Additional Charging Current
Refered to Pin 3
2.75
V
I
22DL
+
Additional Discharging Current
28
40
56
A
Threshold Voltage Level for
Additional Discharging Current
Refered to Pin 3
2.25
V
TUNER AGC
I
23
Maximum Sinked Current
1.5
2
2.5
mA
S23
Current Slope
R
24
= 5k
100
170
230
A/dB
I
23+
Maximum Tuner Plus Sinked Current
Note 6
40
mA
FM SOUND DEMODULATION
V
8S
Input Sensitivity
-3dB FM detected signal
35
V
R
8
Limiter Input Resistance
1.2
k
AMR
Amplitude Modulation Rejection
Note 4
50
61
dB
SVR
Supply Voltage Rejection Ratio
Ripple signal : 100Hz, 0.5V
PP
12
17
dB
V
15
Detected Audio Output Signal
0.85
1.1
1.4
V
RMS
THD
Total Harmonic Distortion
0.2
1
%
R
15
Internal Deemphasis Resistor
600
750
900
S/N
Signal to Noise Ratio
Note 5, Weighted CCIR 468-4
50
55
dB
VOLUME CONTROL
V
C
Range
Control Range
See Figure 22
72
77
dB
AUDIO SWITCH
R
16
Input Resistance
45
60
75
k
CRtk
Crosstalk
70
80
dB
EXTHD
THD on External Signal
V
IN
= 2V
RMS
, Attenuation = 0dB
0.1
0.3
%
Notes : 3. Triggered on white level
4. AMR = 20 log
V
15
(
mV
RMS
)
V
AM
(dB) where V
AM
= output amplitude in AM for f
M
= 1kHz and m = 30%
5.
S
N
=
20 log
V
15
(
mV
RMS
)
V
N
(
mV
RMS
)
(dB)
6. Additional sinked current for large increasing steps of input signal when :
- Voltage Pin 22 > starting point defined Pin 24.
- Output signal (Pin 3) saturated (V
3
< V BTH in BG mode, V
3
> V WTH in L mode).
8224A-04.TBL
STV8224A
4/12
ELECTRICAL CHARACTERISTICS (continued)
(T
amb
= 25
C, V
CC
= 9V, IF input = 10mV
RMS
sync level at B/G, Peak-white level at L,
Video modulation DSB, D = 90% at B/G, D = 95% at L, f
PC
= 38.9MHz, f
SC
= 33.4MHz,
Video BW = 5MHz, Sound carrier input : 5.5MHz, 10mV
RMS
, f
M
= 1kHz, Audio BW = 20kHz,
f =
50kHz,
Volume attenuation = 0dB, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VIDEO SWITCH
V
DC 12
DC Input Level
No signal
1.6
1.9
2.2
V
V
S12
Top Sync. Clamp Level
1.8
V
V
11
DC Output Level
No signal
1.7
2
2.3
V
V
S11
Top Sync. Clamp Level
1.5
V
Crosstalk
55
dB
GEX
Gain from Ext. Input to Output
5.5
6
6.5
dB
Output Swing
4
5
V
I
12
Input Current
V
12
= V
DC12
= 1.5V
1
5
A
VBW
Bandwidth
V
IN
= 1V
PP
15
MHz
G
IN
Gain from Int. Input to Output
-0.5
0
+0.5
dB
MUTE (Pin 9 or Pin 13)
V
TH9
Threshold Voltage Pin 9
1.7
2
2.3
V
V
9
DC Level when Mute Disabled
High impedance controling circuit
2.8
V
V
TH13
Threshold Voltage Pin 13
0.2
0.3
0.4
V
CONTROL INPUT
Negative Modulation
Video : External - Audio : External
Video : Internal - Audio : Internal
7.2
1.8
V
V
Positive Modulation
Video : External - Audio : External
Video : Internal - Audio : External
4.9
2.6
6.4
4.1
V
V
Threshold 3
Level linked to V
CC
6.4
6.8
7.2
V
Threshold 2
Level linked to V
CC
4.1
4.5
4.9
V
Threshold 1
Level linked to V
CC
1.8
2.2
2.6
V
8224A-05.TBL
STV8224A
5/12
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