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TDA4445A TDA4445B
SOUND IF AMPLIFIER
. . . . . . . .
QUADRATURE INTERCARRIER DEMODULATOR VERY HIGH INPUT SENSITIVITY GOOD SIGNAL TO NOISE RATIO FAST AVERAGING AGC IF AMPLIFIER CAN BE SWITCHED OFF FOR VTR MODE GOOD AM SUPPRESSION OUTPUT SIGNAL STABILIZED AGAINST SUPPLY VOLTAGE VARIATIONS VERY FEW EXTERNAL COMPONENTS
DESCRIPTION TDA4445A : Sound IF amplifier, with FM processing for quasi parallel sound system. TDA4445B : Sound IF amplifier, with FM processing and AM demodulator, for multi-standard sound TV appliances. TDA4445B additionnal : Bistandard applications (B/G and L) No adjustment of the AM demodulator Low AM distortion PIN CONNECTIONS
DIP16 (Plastic Package) ORDER CODE : TDA4445A - TDA4445B
IF INPUT NOT TO BE CONNECTED IF AGC TIME CONSTANT NOT TO BE CONNECTED
NOT TO BE CONNE CTED FOR TDA4445A AVE RAGING CAP ACITOR FOR TDA4445B NOT TO BE CONNE CTED FOR TDA4445A A.F. SOUND OUTPUT FOR TDA4445B
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
IF INPUT NOT TO BE CONNECTED NOT TO BE CONNECTED GROUND FM MODULATED SOUND OUTPUT SUPPLY VOLTAGE NOT TO BE CONNECTED REFERENCE L.C. NETWORK
4445-01.EPS
NOT TO BE CONNECTED REFERENCE L.C. NETWORK
December 1992
1/6
TDA4445A - TDA4445B
BLOCK DIAGRAMS TDA4445A
TDA4445B
GENERAL DESCRIPTION
Quasi parallel sound operation : High phase accuracy of the carrier signal proc2/6
. . . .
This circuit includes the following functions : Three symmetrical and gain controlled wide band amplifier stages, which are extremely stable by quasi DC coupling without feedback. Averaging AGC with discharge control circuit AGC voltage generator
AM-Demodulation (only TDA4445B) : Carrier controlled demodulator Audio frequency stage with impedance converter Averaging low pass AGC
. . . . .
essing, independentfrom AM Linear quadrature demodulator Sound-IF-amplifier stage with impedance converter
4445-02.EPS / 4445-03.EPS
TDA4445A - TDA4445B
ABSOLUTE MAXIMUM RATINGS
Symbol VCC ICC Vext Vext Ptot Tj Tamb Tstg Parameter Supply Voltage Range Supply Current External Voltages External Voltages Power Dissipation Junction Temperature Ambient Temperature Range Storage Temperature Range TDA4445A - TDA4445B TDA4445B Pin Pin Pin Pin Pin Pin 11 11 3 12 5 6 Value 15 70 12 8 8 8 1 125 0, + 70 - 25, + 125 Unit V mA V V V V W C C C
Symbol R th(j-a)
Parameter Junction-ambient Thermal Resistance
Value 70
Unit C/W
ELECTRICAL OPERATING CHARACTERISTICS Tamb = + 25C, VCC = 12V (unless otherwise specified)
Symbol DC CHARACTERISTICS VCC ICC VO I R C V I GIF Supply Voltage Supply Current (V3 = 3.5V) DC Output Voltage (V3 = 3.5V) Output DC Current (V3 = 3.5VV11 = 12V) Input Impedance Input Impedance Switch off Control Voltage for VTR Mode Switch off Control Current for VTR Mode IF AGC Range Pin 13 Pin 11 Pin 12 Pin 12 Pins 1-16 Pins 1-16 Pin 3 Pin 3 10 4.25 1 12 45 5 2 2 9 10 150 62 15 60 5.75 2 V mA V mA k pF V A dB Parameter Min. Typ. Max. Unit
AGC CHARACTERISTICS QUASI PARALLEL SOUND OPERATION (fPC = 38.9MHz, fSC1 = 33.4MHz, fSC2 = 33.16MHz, PC/SC1 = 13dB, PC/SC2 = 20dB, PC unmodulated) VI VI VO Min. Input Voltage (5.5MHz - Output Signal - 3dB) Max. Input Voltage (5.5MHz - Output Signal + 1dB) Sound-IF-output Voltage (V1-16 = 20mVeff SC unmodulated) 5.5MHz Output Voltage 5.74MHz Output Voltage Signal to noise ratio measured according to CCIR 468-2 Picture Modulation Ratio 90%, Reference signal (V1-16 = 10mV), FM-frequency deviation30kHz Out 1 350mVRMS fmod = 1kHz, measured at audio-output Out 2 350mVRMS Black Screen (1. Channel/2. Channel) Grid Screen (1. Channel/2. Channel) Pins 1-16 Pins 1-16 Pin 12 200 100 Pin 12 70 90 400 300 Veff mVeff mVeff mVeff
S+N
N
VI VO I d VO
55/50 45/40
dB dB
AM DEMODULATI0N (TDA4445B only) (fSC = 39.2MHz, m = 80%, fmod = 1kHz) Min. Input Voltage (Audio Output Signal - 3dB) Output DC Voltage (V1-16 = 10mVeff unmodulated) Output DC Current (V6 = 7.5V, V3 = 3.5V) Distortion (V1-16 = 10mV, fmod = 1kHz , m = 80%) AF Output Voltage (V1-16 = 100mVeff, m = 50% , fmod = 10kHz) Pins 1-16 Pin Pin Pin Pin 6 6 6 6 3.3 0.3 500 2.5 700 70 4.5 1.2 4 900 Veff
4445-03.TBL
V mA % mVeff
3/6
4445-02.TBL
THERMAL DATA
4445-01.TBL
TDA4445A - TDA4445B
TYPICAL APPLICATION Figure 1 : Quasi Parallel Sound Operation
4/6
4445-04.TIF
TDA4445A - TDA4445B
TYPICAL APPLICATION Figure 2 : Bistandard Operation (FM stereo sound + AM sound)
5/6
4445-05.TIF
TDA4445A - TDA4445B
PACKAGE MECHANICAL DATA 16 PINS - PLASTIC DIP
a1
I
b Z
B e3
e
L
b1
E
D
16
9
F
1
8
Dimensions a1 B b b1 D E e e3 F i L Z
Min. 0.51 0.77
Millimeters Typ.
Max. 1.65
Min. 0.020 0.030
Inches Typ.
Max. 0.065
0.5 0.25 20 8.5 2.54 17.78 7.1 5.1 3.3 1.27
0.020 0.010 0.787 0.335 0.100 0.700 0.280 0.201 0.130 0.050
DIP16.TBL
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 notice. 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. (c) 1994 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 conforms 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.
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PM-DIP16.EPS

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