參數(shù)資料
型號(hào)： TDA9874APS
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： Digital TV sound demodulator/decoder
中文描述： AM/FM, AUDIO DEMODULATOR, PDIP42
封裝： 0.600 INCH, SHRINK, PLASTIC, MS-020, SOT-270-1, DIP-42
文件頁數(shù)： 24/68頁
文件大?。?/td> 231K
代理商： TDA9874APS
1999 Dec 03
24
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
10 I
2
C-BUS CONTROL
10.1
Introduction
The TDA9874A is controlled only via the I
2
C-bus. Control
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
2
C-bus slave transceiver in
accordance with the fast-mode specification with a
maximum speed of 400 kbits/s. Information about the
I
2
C-bus can be found in brochure “I
2
C-bus and how to use
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
2
C-bus interface remains operational in the standby
mode of the TDA9874A to allow the device to be
reactivated via the I
2
C-bus.
The device will not respond to a ‘general call’ on the
I
2
C-bus, i.e. when a slave address of 0000 000 is sent by
a master.
10.2
Power-up state
Afterpower-onresetrespectivelyatpower-upthedeviceis
in the following state:
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
μ
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.
Afterpower-onreset/power-upadeviceinitializationhasto
be performed via the I
2
C-bus to put the TDA9874A into the
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
2
C-bus transmission (such as a
refresh operation) or by writing selectively only to those
registers, the contents of which need to be changed with
regardtothepower-upstate.EasyStandardProgramming
(ESP) can also be used.
ADDR2
ADDR1
SLAVE ADDRESS
A6
A5
A4
A3
A2
A1
A0
0
0
1
1
0
1
0
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
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