TEA6821T Datasheet, PDF (14/47 Pages) NXP Semiconductors – ICE car radio

Philips Semiconductors
ICE car radio
Preliminary specification
TEA6821T
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
THD
total harmonic distortion
detuning ≤ 50 kHz;
∆f = 75 kHz; f_mod = 1 kHz
without de-emphasis
L_demod = typical value
pin 43
−
V_37-35 = 300 µV to 800 mV
pin 47
−
0.1 0.35 %
0.1 0.35 %
V_37-35 = 1 mV to 800 mV
∆V_{43AFCdisabled} demodulator frequency control
/∆V_43AFCactive (AFC) efficiency at 100 kHz detune
from exact tuning
30
34
−
dB
∆V₄₃
residual DC-offset
∆L_demod = typical value;
10 µV < V_37-35 < 80 µV
−
80 µV < V_37-35 < 800 mV −
100 1000 mV
10
30
mV
Unweighted level voltage
BW₅₀
bandwidth
500
R_out50
output resistance
−
V_50-4
level unweighted voltage
see Fig.13; V₃₈ = 2.52 V;
V_37-35 ≤ 2.5 µV
1.8
V_37-35 = 1.0 mV
2.7
V/20 dB
slope of level unweighted voltage
∆V_50-4/∆V_37-35
V_37-35 ≤ 100 µV
(RMS) < 300 mV
0.75
∆V_50-4/VK
temperature dependence
V_37-35 = 1 mV
−
Adjust of level unweighted voltage and V_mutaml; typical adjusting range see Figs 14 and 17.
∆V₅₀
adjusting range
V_37-35 = 1 mV (RMS)
−
∆V_50-4 /∆V_38-4 adjusting gain
−
R₃₈
input resistance
−
V_38-4
internal bias voltage
−
Muting dependence on adjust of level unweighted voltage; typical curve see Fig.15.
−
−
2.4
3.4
0.845
4.0
±2
−0.9
80
2.6
−
100
3.2
4.7
0.95
−
−
−
−
−
kHz
Ω
V
V
V
mV/VK
V
−
kΩ
V
α = V₄₃/V₄₇
∆α /∆V₄₉
start of mute
mute slope
V₄₉/V₂₁ = 0.6
α = −6 dB
−
3
−
−
−
25
−
dB/V
Soft mute, time constant control, mono/stereo blend and high-cut control
Time constant control (see application diagram Fig.3): Slow or fast attack and decay time constants for soft mute,
mono/stereo and high-cut control can be chosen connecting pin 3 to GND or pin 21.
Mute voltage: The static mute voltage follows the level unweighted voltage as function of FM IF₂ voltage and level
adjust voltage V_38-4. It additionally depends on multipath level, noise (adjacent channel interferences) and the position
of Tswitch. Typical curve for mute voltage dependence on V_37-35 see Fig.16.
V_49-4
mute voltage
V₃₈ = 2.52 V;
V_37-35 ≤ 2.5 µV
1.8 2.2 3.2 V
V_37-35 = 1.0 mV
2.7 3.3 4.7 V
September 1993
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