Zakładka z wyszukiwarką danych komponentów |
|
TDA9852 Arkusz danych(PDF) 10 Page - NXP Semiconductors |
|
TDA9852 Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 40 page 1997 Mar 11 10 Philips Semiconductors Preliminary specification I2C-bus controlled BTSC stereo/SAP decoder and audio processor TDA9852 MUTE The mute function can be activated independently with last step of volume control at the left or right output. By setting the general mute bit GMU via the I2C-bus all outputs are muted. All channels include an independent zero cross detector. The zero crossing mute feature can be selected via bit TZCM: TZCM = 0: forced mute with direct execution TZCM = 1: execution in time with signal zero crossing. In the zero cross mode a change in the GMU polarity is activated but not executed. The execution is enabled at the next zero crossing of the signal. To avoid a large delay of mute switching, when very low frequencies are processed, or the output signal amplitude is lower than the DC offset voltage, the following I2C-bus transmissions are needed: a first transmission for mute execution a second transmission about 100 ms later, which must switch the zero crossing mode to forced mute (TZCM = 0) a third transmission to reactivate the zero crossing mode (TZCM = 1). This transmission can take place immediately, but must follow before the next mute execution. 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 line out (500 mV ±20 mV). Store the setting in a non-volatile memory. AUTOMATIC ADJUSTMENT PROCEDURE • Capacitors of external inputs LIL and LIR must be grounded at EIL and EIR • Composite input signal L = 300 Hz, R = 3.1 kHz, 14% modulation for each channel; volume gain +16 dB via I2C-bus • Effects, AVL, loudness off. • Line out setting bits: STEREO = 1, SAP = 0 (see Table 12) • Selector setting SC0, SC1, SC2 = 0, 0, 0 (see Table 11) • 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 • Disconnect the capacitors of external inputs from ground. 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. TIMING CURRENT FOR RELEASE RATE Due to possible internal and external spreading, the timing current can be adjusted via I2C-bus, see Table 20, as recommended by dbx. |
Podobny numer części - TDA9852 |
|
Podobny opis - TDA9852 |
|
|
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 |
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 |