SGS-THOMSON STV8225 Technical data
STV8225
STV8225
AM SIF CIRCUIT
.
.SOUND AM SYNCHRONOUS DEMODULATOR
.AM/FM AUDIO SWITCH
.AV/TVMUTE AUDIOINPUT SWITCH
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
IF INPUT |
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
February 1995 |
1/6 |
STV8225
BLOCK DIAGRAM
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Mean |
Level |
VCC |
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Capacitor |
Switch |
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13 |
4 |
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12 |
STV8225 |
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A |
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B |
7 |
Main Sound Output |
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14 |
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SW1 |
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IF INPUT |
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MUTE |
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1 |
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C |
5 |
FM Sound Input |
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A |
9 |
External Sound Output |
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AGC |
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LOGIC |
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SW2 |
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CONT |
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11 |
External Sound Input |
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2 |
3 |
10 |
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6 |
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AGC |
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Switching |
Mute |
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Capacitor |
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Input |
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Input |
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ABSOLUTE MAXIMUM RATINGS |
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Symbol |
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Parameter |
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Value |
Unit |
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VCC |
Supply Voltage |
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13 |
V |
Tstg |
Storage Temperature |
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-40, +150 |
oC |
Toper |
Operating Temperature |
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0, +70 |
oC |
Ptot |
Power Dissipation |
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0.35 |
W |
THERMAL DATA |
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Symbol |
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Parameter |
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Value |
Unit |
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Rth (j-a) |
Junction-ambient Thermal Resistance |
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Max. |
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90 |
oC/W |
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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 |
Min. |
Typ. |
Max. |
Unit |
VCC |
Supply Voltage |
Pin 12 |
8 |
9 |
10 |
V |
ICC |
Supply Current |
Pin 12 |
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20 |
30 |
mA |
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Supply Voltage Rejection |
Pins 9, 7, 12 - VRipple = 0.5VPP, f = 100Hz |
45 |
53 |
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dB |
IF AMPLIFIER |
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Ri 1, 14 |
Input Resistance (Pins 1-14) |
Resistance between Pin 1 and 14 |
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2 |
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kΩ |
Ci 1, 14 |
Input Capacitance (Pins 1-14) |
Capacitance between Pin 1 and 14 |
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2 |
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pF |
VIF min |
Minimum IF Input Signal |
IF input signal for VOUT = VNOM - 3dB |
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70 |
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μVRMS |
VIF max |
Maximum IF Input Signal |
IF input signal for VOUT = VNOM + 1dB |
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75 |
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mVRMS |
DAV |
AGC Range |
DAV = VIF max / VIF min |
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61 |
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dB |
lAGC |
Maximum AGC Output Current |
Charging and discharging |
±35 |
±50 |
±65 |
μA |
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(Pin 2) |
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IF Bandwidth |
-3dB |
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50 |
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MHz |
8225-02.EPS
8225-02.TBL 8225-01.TBL
8225-03.TBL
2/6
STV8225
ELECTRICAL CHARACTERISTICS (continued) (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 |
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Min. |
Typ. |
Max. |
Unit |
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AM DEMODULATOR |
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AF Output Voltage (Pins 7-9) |
Level switch (Pin 4) open |
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200 |
250 |
300 |
mVRMS |
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Level switch (Pin 4) connected to GND |
400 |
500 |
600 |
mVRMS |
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AF Bandwidth (Pins 7-9) |
-3dB versus nominal signal |
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Lower Limit |
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40 |
Hz |
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Upper Limit |
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50 |
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kHz |
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Harmonic Distorsion (Pins 7-9) |
THD + Noise |
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0.7 |
1.8 |
% |
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S/N (Pins 7-9) |
Weighted according to CCIR 468-4 |
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55 |
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dB |
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MUTE |
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Threshold Level (Pin 6) |
Mute mode if voltage below threshold |
0.2 |
0.3 |
0.4 |
V |
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Attenuation (Pins 7-9) |
Level switch (Pin 4) connected to GND |
80 |
96 |
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dB |
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TV - AM mode |
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AUDIO SWITCHES |
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Switching Voltage (Pin 10) |
Operation mode |
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TV |
TV |
AV |
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AV |
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FM |
AM |
AM |
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FM |
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0V |
Viev1 |
Viev2 |
Viev3 |
VCC |
V10 |
-03.EPS |
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8225 |
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View1 |
Level 1 (Pin 10) |
For voltage below this level |
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1.8 |
2.3 |
2.6 |
V |
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TV-FM mode : Pin 7 connected to A |
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Pin 9 connected to C |
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View2 |
Level 2 (Pin 10) |
For voltage below this level |
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4.1 |
4.6 |
4.9 |
V |
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TV-AM mode : Pin 7 connected to A |
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Pin 9 connected to A |
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View3 |
Level 3 (Pin 10) |
For voltage below this level |
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6.4 |
6.8 |
7.2 |
V |
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AV-AM mode : Pin 7 connected to B |
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Pin 9 connected to A |
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For voltage above this level |
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AV-FM mode : Pin 7 connected to B |
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Pin 9 connected to C |
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Input Current (Pin 10) |
Source current |
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0.3 |
2 |
μA |
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Input Dynamic Range (Pins 5-11) |
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2 |
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VRMS |
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Input Resistance (Pins 5-11) |
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35 |
50 |
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kΩ |
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Switch Gain |
VIN = 2VRMS, f = 1kHz |
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-0.6 |
-0.1 |
0.4 |
dB |
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Pin 7 vs Pin 11 and Pin 9 vs Pin 5 |
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Crosstalk |
f = 1kHz |
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70 |
85 |
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dB |
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Output Resistance (Pins 7-9) |
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70 |
100 |
130 |
Ω |
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Output Current Source (Pins 7-9) |
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1 |
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mA |
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Switch Distorsion |
VIN = 2VRMS, f = 1kHz, THD + Noise, |
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0.1 |
0.5 |
% |
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Pin 7 vs Pin 11 and Pin 9 vs Pin 5 |
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Output Noise |
Unweighted |
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7 |
20 |
μVp |
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DC Plop at AF Output Pin |
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10 |
50 |
mV |
8225-04.TBL
3/6
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