TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 24

• Manufacturer Part Number: TDA9874A
• Description: Digital TV sound demodulator/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
10 I
10.1
The TDA9874A is controlled only via the I
is exercised by writing data to one or more internal
registers. Status information can be read from an array of
registers to let the controlling microprocessor determine
whether any action is required.
The device has an I
accordance with the fast-mode specification with a
maximum speed of 400 kbits/s. Information about the
I
it” (order number 9398 393 40011). To avoid conflicts in a
real application with other ICs providing similar or
complementing functions, there are four possible slave
addresses available, which can be selected by pins
ADDR1 and ADDR2 (see Table 8).
Table 8 Possible slave addresses
The I
mode of the TDA9874A to allow the device to be
reactivated via the I
The device will not respond to a ‘general call’ on the
I
a master.
1999 Dec 03
2
2
ADDR2
C-bus can be found in brochure “I
C-bus, i.e. when a slave address of 0000 000 is sent by
Digital TV sound demodulator/decoder
0
0
1
1
2
2
C-BUS CONTROL
C-bus interface remains operational in the standby
Introduction
ADDR1
0
1
0
1
2
2
C-bus.
C-bus slave transceiver in
A6
1
1
1
1
A5
0
0
0
0
SLAVE ADDRESS
A4
1
1
1
1
2
C-bus and how to use
A3
1
1
1
1
2
C-bus. Control
A2
0
0
0
0
A1
0
0
1
1
A0
0
1
0
1
24
10.2
After power-on reset respectively at power-up the device is
in the following state:
After power-on reset/power-up a device initialization has to
be performed via the I
proper mode of operation, in accordance with the desired
TV standard, etc. This can be done by writing to all
registers with a single I
refresh operation) or by writing selectively only to those
registers, the contents of which need to be changed with
regard to the power-up state. Easy Standard Programming
(ESP) can also be used.
All outputs muted
No sound carrier frequency loaded
General purpose I/O pins ready for input (HIGH)
Input SIF1 selected with:
– AGC on
– SIF 10 dB attenuator off
– Small hysteresis.
Demodulators for both sound carriers set to FM with:
– Identification for B/G, D/K, identification mode ‘slow’
– Level adjustment set to 0 dB
– De-emphasis 50 s
– Dematrix set to mono
– Adaptive de-emphasis off.
Analog outputs are muted and connected to DACs
Digital audio interface all outputs off
Monitor set to carrier 1 DC output.
Power-up state
2
C-bus to put the TDA9874A into the
2
C-bus transmission (such as a
Preliminary specification
TDA9874A