Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

TDA3845 Arkusz danych(PDF) 8 Page - NXP Semiconductors

Numer części TDA3845
Szczegółowy opis  Quasi split-sound circuit and AM demodulator
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3845 Arkusz danych(HTML) 8 Page - NXP Semiconductors

Back Button TDA3845 Datasheet HTML 4Page - NXP Semiconductors TDA3845 Datasheet HTML 5Page - NXP Semiconductors TDA3845 Datasheet HTML 6Page - NXP Semiconductors TDA3845 Datasheet HTML 7Page - NXP Semiconductors TDA3845 Datasheet HTML 8Page - NXP Semiconductors TDA3845 Datasheet HTML 9Page - NXP Semiconductors TDA3845 Datasheet HTML 10Page - NXP Semiconductors TDA3845 Datasheet HTML 11Page - NXP Semiconductors TDA3845 Datasheet HTML 12Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 18 page
background image
January 1993
8
Philips Semiconductors
Objective specification
Quasi split-sound circuit and AM
demodulator
TDA3845; TDA3845T
Notes to the characteristics
1. Start of gain control (LOW IF input signal) at
−3 dB intercarrier signal reduction at pin 12, AGC mode set to FM or
−3 dB AF signal reduction at pin 6, AGC mode set to AM.
2. End of gain control (HIGH IF input signal) at +1 dB intercarrier signal expansion at pin 12, AGC mode set to FM or
+1 dB AF signal expansion at pin 6, AGC mode set to AM.
3. Picture carrier (38.9 MHz) to sound carriers (33.4 MHz/33.158 MHz) ratio: 13/20 dB.
IF input signal (picture carrier at sync pulse); V1-16 = 10 mV (RMS). Transmitter mode: DSB.
Reference for the (S + W)/W ratio (0 dB) corresponds to the sound modulation where f = 1 kHz and frequency
deviation
∆f = ± 50 kHz.
With reduced frequency deviation
∆f = ± 27 kHz and the (S + W)/W figures will decrease by 5.4 dB.
4. If the device is used only for the B/G standard (no AM), the capacitor at pin 5 can be omitted (pin 5 has to be
disconnected). In this event the AGC will always operate as a peak signal AGC and is independent of the voltage at
pin 7.
The AM mode can also be used for the B/G standard, consequently standard switching is not required. However, the
intercarrier level depends on the video modulation and the AF performance may decrease.
When the IC is operated from a 12 V power supply pin 7 can be connected to a 12 V logic level via a 2.2 k
Ω resistor.
5. LC reference circuit for the picture carrier (pins 8 and 9); 68 pF/0.247
µH; in series with 27 pF:
Q loaded = 40 (Qo = 90); tuned to 38.9 MHz yields quadrature demodulation for the picture carrier which provides
optimum video suppression at the intercarrier output (e.g. black-to-white jump of the video modulation.The series
capacitor provides a notch at the sound carrier frequency in order to produce more attenuation for the sound carrier
in the PC reference channel. The ratio of parallel to series capacitance depends on the ratio of picture to sound
carrier frequency which has to be adapted to other TV transmission standards, if required, in accordance with the
formula:
Where:
CS = series capacitor
C = parallel capacitor
fPC = picture carrier frequency
fSC = sound carrier frequency
The result is an improved ‘intercarrier buzz’ in the stereo system B/G, particularly with 250 kHz video modulation
(up to 10 dB improvement in sound Channel 2), or to suppress 350 kHz video modulated beat in the digitally
modulated NICAM subcarrier
In order to optimize the AF signal performance, fine tuning to the optimum S/W at the sound Channel 2 may be
achieved by a 250 kHz video modulated square wave.
6. Residual video AM is defined as:
m=(A
−B)/A
A = intercarrier level at sync pulse
B = intercarrier level at 100% white video modulation
7. If higher AC output current is required an external resistor must be connected between the output pin and ground in
order to increase the bias current of the emitter follower. The permissible maximum DC output current must not be
exceeded.
C
S
C
P fPC fSC
() 2 C
P
=


Podobny numer części - TDA3845

ProducentNumer częściArkusz danychSzczegółowy opis
logo
NXP Semiconductors
TDA3845 PHILIPS-TDA3845 Datasheet
166Kb / 18P
   Quasi split-sound circuit and AM demodulator
January 1993
TDA3845T PHILIPS-TDA3845T Datasheet
166Kb / 18P
   Quasi split-sound circuit and AM demodulator
January 1993
More results

Podobny opis - TDA3845

ProducentNumer częściArkusz danychSzczegółowy opis
logo
TEMIC Semiconductors
U4488B TEMIC-U4488B Datasheet
272Kb / 9P
   Quasi-Split Sound Circuit and AM Demodulator
logo
NXP Semiconductors
TDA3825 PHILIPS-TDA3825 Datasheet
166Kb / 18P
   Quasi split-sound circuit and AM demodulator
January 1993
logo
ATMEL Corporation
U4468B ATMEL-U4468B Datasheet
188Kb / 11P
   Quasi-split Sound Circuit and AM Demodulator IC
logo
TEMIC Semiconductors
U4454B TEMIC-U4454B Datasheet
107Kb / 7P
   Quasi-Split-Sound Processing and AM-Demodulator
logo
NXP Semiconductors
TDA2545A PHILIPS-TDA2545A Datasheet
75Kb / 8P
   Quasi-split-sound circuit
February 1985
logo
List of Unclassifed Man...
TDA2556 ETC-TDA2556 Datasheet
269Kb / 6P
   QUASI SPLIT SOUND CIRCUIT WITH DUAL SOUND DEMODULATORS
logo
NXP Semiconductors
TDA2546A PHILIPS-TDA2546A Datasheet
87Kb / 10P
   Quasi-split-sound circuit with 5,5 MHz demodulation
February 1985
TDA9830 PHILIPS-TDA9830 Datasheet
138Kb / 15P
   TV sound AM-demodulator and audio source switch
June 1994
logo
EPCOS
M3654K EPCOS-M3654K Datasheet
113Kb / 8P
   IF Filter for Quasi/Split Sound Applications
M3565M EPCOS-M3565M Datasheet
99Kb / 8P
   IF Filter for Quasi/Split Sound Applications
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com