TEA6821T Просмотр технического описания (PDF) - Philips Electronics
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TEA6821T Datasheet PDF : 47 Pages
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Philips Semiconductors
ICE car radio
Preliminary specification
TEA6821T
FEATURES
General
• FM mixer for conversion from FM IF1 = 72.2 MHz to FM
IF2 = 10.7 MHz
• AM mixer for conversion from AM IF1 = 10.7 MHz to AM
IF2 = 450 kHz
• FM IF gain stage
• Crystal oscillator providing mixer frequencies and
references for IF count and stereo decoder
• FM quadrature demodulator with automatic centre
frequency adjust and THD compensation
• Level and multipath and noise detectors
• Soft mute
• Stereo noise cancelling and variable de-emphasis
• PLL stereo decoder
• Noise blanker
• AM IF amplifier and demodulator
• I2C-bus transceiver
• IF count for AM and FM
• Reference frequency generation for PLL synthesizer
• Reduced external components
• SW applicable.
Stereo decoder
• Adjustment-free PLL-VCO
• Pilot depending mono/stereo switching
• Analog control of mono/stereo blend
• Adjacent channel noise suppression (114 kHz)
• Pilot canceller
• Analog control of de-emphasis
• Integrated low-pass filters for 190 kHz adjacent channel
interferences and signal delay for interference
absorption circuit.
GENERAL DESCRIPTION
The TEA6821T together with the TEA6810T / TEA6811T
forms an AM/FM electronic tuned car radio in a double
conversion receiver concept for European, American and
Japanese frequency range.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Vs1
Vs1
Is1
Is1
Vs2
Vs2
Is2
Is2
S+N/N
THD
S+N/N
THD
α
Tamb
supply voltage 1 (pins 56 and 28)
operating range
supply current 1 FM
supply current 1 AM
supply voltage 2 (pin 5)
operating range
supply current 2 FM
supply current 2 AM
signal-to-noise AM
distortion AM
signal-to-noise FM
distortion FM
channel separation (adjusted)
operating ambient temperature
note 1
7
8.5
8.1 8.5
−
28
−
24
note 1
4.5 5.0
4.75 5.0
−
31
−
28
m = 0.3
−
57
−
1
∆f = 22.5 kHz at pins 43 and 47 66
72
∆f = 75 kHz
−
0.1
40
−
−40 −
10
V
8.9 V
−
mA
−
mA
5.5 V
5.25 V
−
mA
−
mA
−
dB
2
%
−
dB
0.35 %
−
dB
+85 °C
Note to the quick reference data
1. IC is functional, specified parameters may deviate from limits which are valid for operating range.
September 1993
2
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