STV8224B
MULTISTANDARD VIDEO AND SOUND IF SYSTEM
WITH AUDIO AND VIDEO SWITCHES
January 1997
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
AUDIO AND 2nd IF DECOUPLING
INTERNAL VIDEO INPUT
VIDEO SWITCH OUTPUT
EXTERNAL VIDEO INPUT
82
24
B
-
01.
E
P
S
PIN CONNECTIONS
SHRINK24
(Plastic Package)
ORDER CODE : STV8224B
.
VIDEO PLL DEMODULATION
.
SOUND PLL DEMODULATION
.
POSITIVE AND NEGATIVE MODULATION
.
AGC FOR BG AND L STANDARDS
.
AUDIO SWITCH
.
DC VOLUME CONTROL
.
VIDEO SWITCH
DESCRIPTION
The STV8224B is 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
STV8224B
Int/Ext
BG/L
AUDIO
OUT
EXT
AUDIO
IF INPUT
19
16
20
21
22
23
24
14 13
15
7
4
11
10
3
18
17
12
5
1
6
2
PIF PLL
& AFC
VID
AMP
6dB
V
CC
WHITE NOISE
&
SPOT INVERT
LOGIC
INTERFACE
TUNER
AGC
AGC
DC
VOLUME
8
9
SIF
PLL
LIMITER
AUDIO
Vref
MUTE
SFE
5.5
SFE
6.5
82
24
B
-
02.
E
P
S
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
822
4B
-
01.
T
B
L
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction-ambient Thermal Resistance
Max.
75
o
C/W
82
24B
-
02.
T
B
L
STV8224B
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
2
k
C
19-20
Differential Input Capacitance
2
pF
Gr
Gain Control Range
68
dB
Max Input Signal
+1dB Video at Output
180
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
7
9
MHz
Dg
Differential Gain
6
8
%
Dp
Differential Phase
3
6
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
56
61
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).
8
224B
-
0
3
.
T
B
L
STV8224B
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
22 CL
+
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
22 DL
+
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 4
40
mA
FM SOUND DEMODULATION
V
8S
Input Sensitivity
150
V
RMS
R
8
Limiter Input Resistance
600
DC Voltage (Pin 8)
4.2
V
AMR
Amplitude Modulation Rejection
Note 5
50
61
dB
SVR
Supply Voltage Rejection Ratio
Ripple signal : 100Hz, 0.5V
PP
28
33
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
See Note 6,
Weighted CCIR 468-4,
(quasi peak level) input Pin 8
55
60
dB
Black Picture (sync only)
Measurement between I F input
(Pins 19-20) and audio output (Pin 15)
SAW : K2955
BPF : SFE5.5MB
47
52
dB
White Picture
46
50
dB
250kHz Square Wave
47
52
dB
VOLUME CONTROL
V
C
Range
Control Range
See Figure 22
72
77
dB
Notes : 3. Triggered on white level
4. 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).
5. AMR = 20 log
V
15
(
mV
RMS
)
V
AM
(dB) where V
AM
= output amplitude in AM for f
M
= 1kHz and m = 30%
6.
S
N
=
20 log
V
15
(
mV
RMS
)
V
N
(
mV
RMS
)
(dB)
8224
B
-
0
4
.
T
B
L
STV8224B
4/12
ELECTRICAL CHARACTERISTICS (continued)
(T
amb
= 25
C, V
CC
= 9V, IF input = 10mV
RMS
synclevel 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
AUDIO SWITCH
R
16
Input Resistance
55
70
85
k
CRtk
Crosstalk
70
80
dB
En
Output Noise Level (Pin 14)
Weighted CCIR 468-4, V
13
= 0.5V
(quasi peak level)
70
V
EXTHD
THD on External Signal (Pin 14)
V
IN
= 2V
RMS
, Attenuation = 0dB
0.1
0.3
%
Audio Reference Voltage (Pin 9)
4.5
V
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 13)
V
TH13
Threshold Voltage Pin 13
0.2
0.3
0.4
V
CONTROL INPUT
Negative Modulation
Video : External - Audio : External
7.2
V
Threshold 3
Level linked to V
CC
6.4
6.8
7.2
V
Positive Modulation
Video : External - Audio : External
4.9
6.4
V
Threshold 2
Level linked to V
CC
4.1
4.5
4.9
V
Positive Modulation
Video : Internal - Audio : External
2.6
4.1
V
Threshold 1
Level linked to V
CC
1.8
2.2
2.6
V
Negative Modulation
Video : Internal - Audio : Internal
1.8
V
8224
B
-
05
.
T
B
L
STV8224B
5/12
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