TEA6824 Просмотр технического описания (PDF) - Philips Electronics
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TEA6824 Datasheet PDF : 36 Pages
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Philips Semiconductors
In Car Entertainment (ICE) car radio
Preliminary specification
TEA6824T
handbook, full pagewidth
FM IF2
prescaler setting
AM IF2
FM IF-PRESCALER
÷ 25 /÷ 200
B0 B1 B2 B3 B4 B5 B6 B7
8-BIT BINARY COUNTER
4 ms/40 ms
counter window
MHA205
Fig.11 IF-counter structure.
IF-counter read out
IF-counter read out as a function of FM or AM position, counter window and prescaler setting
FM/AM
FM
FM
FM
FM(1)
AM
AM(1)
PRESCALER
RATIO
200
200
25
25
1
1
WINDOW
(ms)
4
40
4
40
4
40
fIF
(kHz)
10 700
10 700
10 700
10 700
450
450
READ OUT
RESOLUTION
(Hz/count)
D6H
5CH
B0H
E0H
08H
50H
50 000
5 000
6 250
625
250
25
RANGE (kHz)
MIN.
MAX.
4 300
10 065
9 906.25
10 620.63
418.25
446.83
17 050
11 335
11 493.75
10 779.38
481.75
453.18
Note
1. In position FM with a prescaler ratio of 25, counter window of 40 ms and in position AM with 40 ms counter window
ambiguous counting results within the IF filter bandwidth are obtained. The counting range is 127 counts above and
127 counts below the nominal IF of 10.7 MHz for FM and 450 kHz for AM.
The IF-count windows are valid for a crystal oscillator frequency of 61.5 MHz.
The FM/AM switching is carried out by bit 0 of byte 2 of the received data of the IC.
The IF-counter operates continuously.
The IF-counter and window counter will be reset when the I2C-bus logic detects the address of the IC. This disables
changes in the latches for the IF-counter, while reading this value. If the transmission to the front-end IC is disabled after
the synthesizer loop of the TEA6810T front-end IC has locked to a new frequency, the IF-counter will be available after
the set measuring time.
The IF-counter starts at 0. The IF-counter output are the 8 least significant bits of the counting result.
1997 May 05
19
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