SGS-THOMSON STV8225 Technical data
查询STV8225供应商
.
SOUND AM SYNCHRONOUS DEMODULATOR
.
AM/FMAUDIO SWITCH
.
AV/TVAUDIO SWITCH
.
MUTE INPUT
STV8225
AM SIF CIRCUIT
DESCRIPTION
The STV8225 is intended for the demodulation of
the AM soundof the L standard.
Used as an add on to the STV8224 it permits to
design a multistandard set with the needed
switchesfor one SCART plug.
PINCONNECTIONS
IF INPUT
AGC CAPACITOR
GND
LEVEL SWITCH
FM SOUNDINPUT
1
2
3
4
5
14
13
12
11
10
DIP14
(Plastic Package)
ORDER CODE : STV8225
IF INPUT
MEANCAPACITOR
V
CC
EXTERNALSOUND INPUT
SWITCHINGINPUT
February 1995
MUTE INPUT
MAINSOUNDOUTPUT
6
7
EXTERNALSOUND OUTPUT
9
NOTTO BE CONNECTED
8
8225-01.EPS
1/6
STV8225
BLOCK DIAGRAM
14
IF INPUT
1
AGC
Mean
Capacitor
Level
Switch
41213
LOGIC
CONT
V
CC
MUTE
STV8225
A
B
SW1
C
A
SW2
7
Main Sound Output
5
FM Sound Input
9
External Sound Output
11
External Sound Input
23
AGC
Capacitor
10
Switching
Input
6
Mute
Input
ABSOLUTEMAXIMUMRATINGS
Symbol Parameter Value Unit
V
CC
T
stg
T
oper
P
tot
Supply Voltage 13 V
Storage Temperature -40, +150
Operating Temperature 0, +70
Power Dissipation 0.35 W
THERMAL DATA
Symbol Parameter Value Unit
R
th (j-a)
ELECTRICAL CHARACTERISTICS (VCC=9V,VIN=10mV
m = 54% modulation depth,Audio BW = 40Hz to 15kHz, T
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
CC
I
CC
IF AMPLIFIER
Ri 1, 14 Input Resistance (Pins 1-14) Resistancebetween Pin 1 and 14 2 kΩ
Ci 1, 14 Input Capacitance (Pins 1-14) Capacitance between Pin1 and 14 2 pF
VIF min Minimum IF Input Signal IF input signal for V
VIF max Maximum IF Input Signal IF input signal for V
DAV AGC Range DAV = VIF max / VIF min 61 dB
l
AGC
Junction-ambient Thermal Resistance Max. 90
RMS,fSC
amb
=32.4MHz, fM=1kHz,
=25oC, unless otherwisespecified)
Supply Voltage Pin 12 8 9 10 V
Supply Current Pin 12 20 30 mA
Supply Voltage Rejection Pins 9, 7, 12 - V
Maximum AGC Output Current
Charging and discharging ±35 ±50 ±65 µA
= 0.5VPP, f = 100Hz 45 53 dB
Ripple
OUT=VNOM
OUT=VNOM
-3dB 70 µV
+ 1dB 75 mV
(Pin 2)
IF Bandwidth -3dB 50 MHz
o
o
o
C/W
8225-02.EPS
C
C
8225-01.TBL
8225-02.TBL
RMS
RMS
8225-03.TBL
2/6
STV8225
ELECTRICAL CHARACTERISTICS (continued)(VCC=9V,VIN=10mV
m =54% modulation depth, Audio BW = 40Hzto 15kHz, T
=25oC, unless otherwise specified)
amb
RMS,fSC
=32.4MHz, fM=1kHz,
Symbol Parameter Test Conditions Min. Typ. Max. 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)
-3dB versus nominal signal
Lower Limit
Upper Limit
200
400
50
250
500
300
mV
mV
600
40 Hz
Harmonic Distorsion (Pins 7-9) THD + Noise 0.7 1.8 %
S/N (Pins 7-9) Weighted according to CCIR 468-4 55 dB
MUTE
Threshold Level (Pin 6) Mute mode if voltage below threshold 0.2 0.3 0.4 V
Attenuation (Pins 7-9) Level switch (Pin 4) connected to GND
80 96 dB
TV - AM mode
AUDIO SWITCHES
Switching Voltage (Pin 10) Operation mode
TV
FM
0V V
TV
AM
Viev1
View1 Level 1 (Pin 10) For voltage below this level
AV
AM
Viev2
AV
FM
V
Viev3
CC
10
1.8 2.3 2.6 V
TV-FM mode : Pin 7 connected to A
Pin 9 connected to C
View2 Level 2 (Pin 10) For voltage below this level
4.1 4.6 4.9 V
TV-AM mode : Pin 7 connected to A
Pin 9 connected to A
View3 Level 3 (Pin 10) For voltage below this level
6.4 6.8 7.2 V
AV-AM mode : Pin 7 connected to B
Pin 9 connected to A
For voltage above this level
AV-FM mode : Pin 7 connected to B
Pin 9 connected to C
Input Current (Pin 10) Source current 0.3 2 µA
Input Dynamic Range (Pins 5-11) 2 V
InputResistance (Pins5-11) 35 50 kΩ
Switch Gain V
=2V
IN
Pin 7 vs Pin 11 and Pin 9 vs Pin 5
, f = 1kHz
RMS
-0.6 -0.1 0.4 dB
Crosstalk f = 1kHz 70 85 dB
Output Resistance (Pins7-9) 70 100 130 Ω
Output Current Source (Pins 7-9) 1 mA
Switch Distorsion V
=2V
IN
Pin 7 vs Pin 11 and Pin 9 vs Pin 5
, f = 1kHz, THD+ Noise,
RMS
0.1 0.5 %
Output Noise Unweighted 7 20 µVp
DC Plop at AF Output Pin 10 50 mV
RMS
RMS
kHz
8225-03.EPS
RMS
8225-04.TBL
3/6
Loading...