Os motores de busca de Datasheet de Componentes eletrônicos |
|
TDA9850T Folha de dados(PDF) 8 Page - NXP Semiconductors |
|
TDA9850T Folha de dados(HTML) 8 Page - NXP Semiconductors |
8 / 32 page 1995 Jun 19 8 Philips Semiconductors Preliminary specification I2C-bus controlled BTSC stereo/SAP decoder TDA9850 Adjustment procedure COMPOSITE INPUT LEVEL ADJUSTMENT Feed in from FM demodulator the composite signal with 100% modulation (25 kHz deviation) L + R; fi = 300 Hz. Set input level control via I2C-bus monitoring OUTL or OUTR (500 mV ±20 mV). Store the setting in a non-volatile memory. AUTOMATIC ADJUSTMENT PROCEDURE • Connect 2.2 µF capacitors from ACR and ACL to ground. • Composite input signal L = 300 Hz, R = 3.1 kHz, 14% modulation for each channel. • Mode selection setting bits: STEREO = 1, SAP = 0 (see Table 8). • Start adjustment by transmission ADJ = 1 in register ALI3. The decoder will align itself. • After 1 second minimum stop alignment by transmitting ADJ = 0 in register ALI3 read the alignment data by an I2C-bus read operation from ALR1 and ALR2 (see Chapter “I2C-bus protocol”) and store it in a non-volatile memory. The alignment procedure overwrites the previous data stored in ALI1 and ALI2. • The capacitors from ACR and ACL may be disconnected after alignment. MANUAL ADJUSTMENT Manual adjustment is necessary when no dual tone generator is available (e.g. for service). • Spectral and wideband data have to be set to 10000 (middle position for adjustment range) • Composite input L = 300 Hz; 14% modulation • Adjust channel separation by varying wideband data • Composite input L = 3 kHz; 14% modulation • Adjust channel separation by varying spectral data • Iterative spectral/wideband operation for optimum adjustment • Store data in non-volatile memory. After every power-on, the alignment data and the input level adjustment data must be loaded from the non-volatile memory. TIMING CURRENT FOR RELEASE RATE Due to possible internal and external spreading, the timing current can be adjusted via I2C-bus, see Table 9, as recommended by dbx. |
Nº de peça semelhante - TDA9850T |
|
Descrição semelhante - TDA9850T |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
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 |