TEA6821T Datasheet, PDF (30/47 Pages) NXP Semiconductors – ICE car radio

Philips Semiconductors
ICE car radio
Preliminary specification
TEA6821T
Output signal of reference frequency divider
SYMBOL
C_10-4, C_11-4
R_10-52, R_11-52
V_10-11
V_10-4, V_11-4
PARAMETER
output capacitance
output resistance
differential output voltage (peak-to-peak value)
single-ended output voltage (peak-to-peak value)
IF-counter; note 1
SYMBOL
V_33-34
V_37-35
PARAMETER
IF-counter sensitivity for AM, m = 0
IF-counter sensitivity for FM
Note
1. Counting windows AM: 4 ms, (40 ms); FM: 40 ms, 4 ms
Counting resolution AM: 250 Hz, (25 Hz); FM: 5 kHz, 50 kHz
IF-prescaler AM: division by 1; FM: division by 200
MIN.
−
800
0.3
0.15
TYP.
−
1000
0.4
0.2
MAX.
4
1200
0.5
0.3
UNIT
pF
Ω
V
V
MIN.
200
200
UNIT
µV
µV
The IF-count windows are valid for a crystal oscillator frequency of 61.5 MHz.
The FM/AM switching is done 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 resetted 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 will be disabled
after the synthesizer loop of the 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.
September 1993
Fig.23 IF-counter structure.
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