參數(shù)資料
型號(hào)： TEA6822T-T
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO56
封裝： PLASTIC, SOT-190-1, VSOP-56
文件頁數(shù)： 24/48頁
文件大?。?/td> 351K
代理商： TEA6822T-T
1997 Feb 12
30
Philips Semiconductors
Preliminary specication
In Car Entertainment (ICE) car radio
TEA6820T; TEA6822T
IF counter read out
IF counter read out as a function of FM or AM position, counter window and prescaler setting
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 count, while reading this value. If the transmission to the front-end IC is disabled after
the synthesizer loop of the TEA6810T/TEA6811T front-end IC has locked for a new frequency, the IF-count 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.
FM/AM
PRESCALER
RATIO
WINDOW
(ms)
fIF
(kHz)
READ OUT
RESOLUTION
(Hz/count)
RANGE (kHz)
MIN.
MAX.
FM
200
4
10700
D6H
50000
4300
17050
FM
200
40
10700
5CH
5000
10065
11335
FM
25
4
10700
B0H
6250
9906.25
11493.75
FM(1)
25
40
10700
E0H
625
10620.63
10779.38
AM
1
4
450
08H
250
418.25
481.75
AM(1)
1
40
450
50H
25
446.83
453.18
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