STMICROELECTRONICS STV8225

STV8225
AM SIF CIRCUIT
..
..
SOUND AM SYNCHRONOUS DEMODULATOR
AM/FM AUDIO SWITCH
AV/TV AUDIO SWITCH
MUTE INPUT
DIP14
(Plastic Package)
ORDER CODE : STV8225
DESCRIPTION
The STV8225 is intended for the demodulation of
the AM sound of the L standard.
Used as an add on to the STV8224 it permits to
design a multistandard set with the needed
switches for one SCART plug.
PIN CONNECTIONS
1
14
IF INPUT
AGC CAPACITOR
2
13
MEAN CAPACITOR
GND
3
12
VCC
LEVEL SWITCH
4
11
EXTERNAL SOUND INPUT
FM SOUND INPUT
5
10
SWITCHING INPUT
MUTE INPUT
6
9
EXTERNAL SOUND OUTPUT
MAIN SOUND OUTPUT
7
8
NOT TO BE CONNECTED
8225-01.EPS
IF INPUT
February 1995
1/6
STV8225
BLOCK DIAGRAM
Level VCC
Switch
Mean
Capacitor
13
4
12
STV8225
A
B
7
Main Sound Output
5
FM Sound Input
9
External Sound Output
11
External Sound Input
SW1
14
IF INPUT
MUTE
1
C
A
SW2
2
3
AGC
Capacitor
10
6
Switching
Input
Mute
Input
8225-02.EPS
LOGIC
CONT
AGC
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Supply Voltage
VCC
Tstg
Storage Temperature
Toper
Operating Temperature
Ptot
Power Dissipation
Unit
13
V
-40, +150
o
C
0, +70
o
C
0.35
W
8225-01.TBL
Symbol
Symbol
Parameter
Value
Junction-ambient Thermal Resistance
Rth (j-a)
Max.
Unit
o
90
C/W
8225-02.TBL
THERMAL DATA
ELECTRICAL CHARACTERISTICS (VCC = 9V, VIN = 10mVRMS, fSC = 32.4MHz, fM = 1kHz,
m = 54% modulation depth, Audio BW = 40Hz to 15kHz, Tamb = 25oC, unless otherwise specified)
Symbol
Parameter
Test Conditions
VCC
Supply Voltage
Pin 12
ICC
Supply Current
Pin 12
Supply Voltage Rejection
Pins 9, 7, 12 - VRipple = 0.5VPP, f = 100Hz
Min.
8
45
Typ. Max.
Unit
9
10
V
20
30
mA
53
dB
Ri 1, 14
Input Resistance (Pins 1-14)
Resistance between Pin 1 and 14
2
kΩ
Ci 1, 14
Input Capacitance (Pins 1-14)
Capacitance between Pin 1 and 14
2
pF
VIF min
Minimum IF Input Signal
IF input signal for VOUT = VNOM - 3dB
70
µVRMS
VIF max
Maximum IF Input Signal
IF input signal for VOUT = VNOM + 1dB
75
mVRMS
DAV
AGC Range
DAV = VIF max / VIF min
61
dB
lAGC
Maximum AGC Output Current
(Pin 2)
Charging and discharging
IF Bandwidth
-3dB
2/6
±35
±50
50
±65
µA
MHz
8225-03.TBL
IF AMPLIFIER
STV8225
ELECTRICAL CHARACTERISTICS (continued) (V CC = 9V, VIN = 10mVRMS, fSC = 32.4MHz, fM = 1kHz,
m = 54% modulation depth, Audio BW = 40Hz to 15kHz, Tamb = 25oC, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ. Max.
200
400
250
500
Unit
AM DEMODULATOR
AF Output Voltage (Pins 7-9)
Level switch (Pin 4) open
Level switch (Pin 4) connected to GND
AF Bandwidth (Pins 7-9)
Lower Limit
Upper Limit
-3dB versus nominal signal
Harmonic Distorsion (Pins 7-9)
THD + Noise
0.7
S/N (Pins 7-9)
Weighted according to CCIR 468-4
55
Threshold Level (Pin 6)
Mute mode if voltage below threshold
0.2
0.3
Attenuation (Pins 7-9)
Level switch (Pin 4) connected to GND
TV - AM mode
80
96
300
600
mVRMS
mVRMS
40
Hz
kHz
1.8
%
50
dB
MUTE
0.4
V
dB
AUDIO SWITCHES
Operation mode
Viev1
Viev2
Viev3
VCC
V10
View1
Level 1 (Pin 10)
For voltage below this level
TV-FM mode : Pin 7 connected to A
Pin 9 connected to C
1.8
2.3
2.6
V
View2
Level 2 (Pin 10)
For voltage below this level
TV-AM mode : Pin 7 connected to A
Pin 9 connected to A
4.1
4.6
4.9
V
View3
Level 3 (Pin 10)
For voltage below this level
AV-AM mode : Pin 7 connected
Pin 9 connected
For voltage above this level
AV-FM mode : Pin 7 connected
Pin 9 connected
6.4
6.8
7.2
V
0.3
2
Input Current (Pin 10)
to B
to A
to B
to C
Source current
Input Dynamic Range (Pins 5-11)
2
Input Resistance (Pins 5-11)
35
50
Switch Gain
VIN = 2VRMS, f = 1kHz
Pin 7 vs Pin 11 and Pin 9 vs Pin 5
-0.6
-0.1
Crosstalk
f = 1kHz
70
85
70
100
Output Resistance (Pins 7-9)
Output Current Source (Pins 7-9)
VIN = 2VRMS, f = 1kHz, THD + Noise,
Pin 7 vs Pin 11 and Pin 9 vs Pin 5
Output Noise
Unweighted
DC Plop at AF Output Pin
kΩ
0.4
0.1
dB
dB
130
1
Switch Distorsion
µA
VRMS
Ω
mA
0.5
%
7
20
µVp
10
50
mV
3/6
8225-04.TBL
0V
AV
FM
AV
AM
TV
AM
TV
FM
8225-03.EPS
Switching Voltage (Pin 10)
4/6
8225-06.EPS
AFC
Output
12V
Tuner AGC
Output
R15
6.8kΩ
9V
R16
100kΩ
R17
100kΩ
390Ω
R34
15Ω
R35
C16
47µF
C17
1µF
9V
C33
10µF
DZ1
BZX55C
9V6
Q4
BC337
R14
27kΩ
Switching
Voltage
R13
68Ω
C15
680nF
P1
10kΩ
1
24
VIDEO SAW
FILTER
BGDKL
IF1
Tuner
AGC
Delay
SOUND SAW
FILTER
L STD
IF2
C32
10nF
C14
4.7nF
2
23
3
22
L5
3.3µH
C18
1µF
4
21
R22
150Ω
LC1
IC2
6
19
68pF
C28
100nF
C20
47µF
C21
BFP
6.5MHz
CF2
BFP
5.5MHz
CF1
D2
C25
1µF
1N4148
D1
1N4148
7
12
8
17
3
10
9
8
R27
10
15
5
C26
100nF
R25
2.7kΩ
R24
4.7kΩ
1.8kΩ
R20
1kΩ
1.8kΩ
R21
C24
1nF
9
16
Level
Switch
4
6
C22
10µF
SW4
STD
R28
4.7kΩ
12
13
7
8.2µH
Mute
CF3
TRAP FILTER
(5.5MHz - 6.5MHz)
L6
R26
3.9kΩ
Q3
BC547
+9V
11
14
C7
68nF
C23
10µF
STV8225
SW1
C27
470nF
R12
2.2kΩ
BC547
R9
560Ω
Q2
75Ω
R18
R10
22Ω
+9V
470nF
C30
Switched
Sound
Output
Sound
Output
External
Sound
Input
R19
1kΩ
R29
75Ω
CVBS
Output
(to SCART)
CVBS
Ouput
External
CVBS
Input
Volume
Control
R32
10kΩ
C31
100nF
4.7µF
C6
10µF
220Ω
11
C8
R11
C12
100nF
10µF
C9
47µF
C11
IC1
C10
22µF
STV8224
18
2
1
38.9MHz
5
20
C29
10nF
C19
47nF
3.3µH
L4
13
14
C13
10µF
3.3µH
L7
STV8225
APPLICATION DIAGRAM
STV8224 - STV8225
STV8225
INPUT/OUTPUT PINS CONFIGURATION
CONTROL
SC_OUT
11
10
9
5µA
5kΩ
VCC
250µA
VCC
125µA
SC_IN
12
50µA
VCC
C_MEAN 13
50µA
1mA
250µA
VREF
4.3V
VREF
4.3V
10µA
50kΩ
100Ω
8
V6.4
(if used)
7
AUDIO
1.3kΩ
6.4V
IF1 14
26kΩ
125µA
1kΩ
1
1kΩ
IF2
6.0V
VCC
4.2V
5µA
(charge)
1mA
250µA
100Ω
IC
50µA
VREF
4.3V
(discharge)
3
4
5
6
GND
LSW
FM_IN
MUTE
STV8225
8225-04.EPS
ID
10µA
66kΩ
50kΩ
VCC
6V
2.7V
VCC
114kΩ
2
100µA
C_AGC
VCC
5/6
STV8225
PM-DIP14.WMF
PACKAGE MECHANICAL DATA
14 PINS - PLASTIC DIP
a1
B
b
b1
D
E
e
e3
F
i
L
Z
Min.
0.51
1.39
Millimeters
Typ.
Max.
1.65
Min.
0.020
0.055
0.5
0.25
Inches
Typ.
0.065
0.020
0.010
20
0.787
8.5
2.54
15.24
0.335
0.100
0.600
7.1
5.1
0.280
0.201
3.3
1.27
Max.
0.130
2.54
0.050
0.100
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
 1995 SGS-THOMSON Microelectronics - All Rights Reserved
Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
I2C Patent. Rights to use these components in a I2C system, is granted provided that the system confo rms to
the I2C Standard Specifications as defined by Philips.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
6/6
DIP14.TBL
Dimensions