SGS Thomson Microelectronics STV8225 Datasheet

.

SOUND AM SYNCHRONOUS DEMODULATOR

.

AM/FMAUDIO SWITCH

.

AV/TVAUDIO SWITCH

.

MUTE INPUT

STV8225

AM SIF CIRCUIT

DIP14

(Plastic Package)

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

MUTE INPUT

MAINSOUNDOUTPUT

1
2
3
4
5
6
7

14
13
12
11
10

ORDER CODE : STV8225

IF INPUT
MEANCAPACITOR
V

CC

EXTERNALSOUND INPUT
SWITCHINGINPUT
EXTERNALSOUND OUTPUT

9

NOTTO BE CONNECTED

8

February 1995

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

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