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4.27
AM Noise Blanker
The AM Noise Blanker of the ATR4258 can be activated by bit 5. The noise peak is detected in
the field strength of the first IF and if the disturbance exceeds the level defined by the bits 85 to
87, the signal is muted at the second IF.
Table 4-34.
AM Noise Blanker Activation
AM Noise Blanker
Off
On
Bit 5
0
1
Table 4-35.
Sensitivity of AM Noise Blanker
4.28
AM Noise Blanker Sensitivity
Low
.....
Normal
...
High
3-wire Bus Description
Bit 87
0
...
0
...
1
Bit 86
0
...
1
...
1
Bit 85
0
...
1
...
1
The register settings of the ATR4258 are programmed by a 3-wire bus protocol. The bus proto-
col consists of separate commands. A defined number of bits are transmitted sequentially during
each command.
One command is used to program all bits of one register. The different registers available (see
Table 4-36 on page 22 ) are addressed by the length of the command (number of transmitted
bits) and by three address bits that are unique for each register of a given length. 8-bit registers
are programmed by 8-bit commands and 24-bit registers are programmed by 24-bit commands.
Each bus command starts with a rising edge on the enable line (EN) and ends with a falling edge
on EN. EN has to be kept HIGH during the bus command.
The sequence of transmitted bits during one command starts with the LSB of the first byte and
ends with the MSB of the last byte of the register addressed. The DATA is evaluated at the rising
edges of CLK. The number of LOW to HIGH transitions on CLK during the HIGH period of EN is
used to determine the length of the command.
The bus protocol and the register addressing of the ATR4258 are compatible to the addressing
used in the U4256BM. That means both the ATR4258 and U4256BM can be operated on the
same 3-wire bus as shown in the application circuit ( Figure 10-9 on page 36 ).
20
ATR4258
4838B–AUDR–05/05
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