tda9874h NXP Semiconductors, tda9874h Datasheet - Page 15

• Manufacturer Part Number: tda9874h
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7
7.1
The TDA9874H 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 6).
Table 6 Possible slave addresses
The I
mode of the TDA9874H to allow the device to be
reactivated via the I
The device will not respond to a ‘general call’ on the
I
a master.
2000 Jun 26
2
2
C-bus can be found in brochure “I
C-bus, i.e. when a slave address of 000 0000 is sent by
ADDR2
Digital TV sound demodulator/decoder
I
2
0
0
1
1
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 A5 A4 A3 A2 A1 A0
1
1
1
1
0
0
0
0
SLAVE ADDRESS
1
1
1
1
2
C-bus and how to use
1
1
1
1
2
C-bus. Control
0
0
0
0
0
0
1
1
0
1
0
1
15
7.2
At power-up the device is in the following state:
After power-up a device initialization has to be performed
via the I
of operation, in accordance with the desired TV standard,
etc. This can be done by writing to all registers with a
single I
writing selectively only to those registers, the contents of
which need to be changed with regard to the power-up
state.
All outputs muted
No sound carrier frequency loaded
General purpose I/O pins ready for input (HIGH)
Input SIF1 selected with:
– AGC on
– Small hysteresis.
Demodulators for both sound carriers set to FM with:
– Identification for B/G, D/K, identification mode ‘slow’
– Level adjust set to 0 dB
– De-emphasis 50 s
– Dematrix set to mono
– Adaptive de-emphasis on.
Outputs OUTL and OUTR set to mono and connected to
DAC
Digital audio interface all outputs off
Monitor set to carrier 1 DC output.
2
Power-up state
2
C-bus transmission (like a refresh operation) or by
C-bus to put the TDA9874H into the proper mode
Product specification
TDA9874H