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TDA9852 датащи(PDF) 10 Page - NXP Semiconductors

номер детали TDA9852
подробное описание детали  I2C-bus controlled BTSC stereo/SAP decoder and audio processor
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA9852 датащи(HTML) 10 Page - NXP Semiconductors

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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.


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