TEA6821T Datasheet, PDF (18/47 Pages) NXP Semiconductors – ICE car radio

Philips Semiconductors
ICE car radio
Preliminary specification
TEA6821T
SYMBOL
PARAMETER
CONDITIONS
High-cut control (see Fig.22)
τ_deemph
control range of de-emphasis
V₁₈ − 0.75V₂₁ control voltage
τ_deemph = 50 µs
τ_deemph = 80 µs
The nominal de-emphasis value can be changed to 75 µs with C₃₁, C₃₂ = 10 nF.
Voltage controlled oscillator
The VCO is adjusted by means of a digital auxiliary PLL.
f_osc
oscillator frequency range
Noise blanker
Interference detection at pin 50 level unweighted or MPXOUT (pin 47)
T_sup
interference suppression time
f_c
high-pass input filter for interference 3 dB frequency
pulse, 2nd order
IAC control
I₅₁
charge current (into 4 V)
discharge current (from 8.5 V)
V_pulse
∆V_DC (pin 51)
V_tr (pin 46)
∆V_DC (pin 51)
V_tr (pin 46)
I_os
trigger sensitivity
trigger threshold measured with
f_int = 250 kHz
gate input offset current at pins 31
and 32 during suppression pulse
duration
τ_pulse = 10 µs
V_noise (pin 46) = 10 mV
V_DC (pin 51) = 7.7 V
V_noise (pin 46) = 100 mV
V_DC (pin 51) = 6.7 V
MIN. TYP. MAX. UNIT
50
−
80
µs
0
−
−
mV
−
−300 −
mV
450 456 462 kHz
−
40
50
µs
150 200 250 kHz
5.0 10
18
µA
−0.5 −1.0 −1.8 mA
−
−
20
mV
−
200 −
mV
−
10
−
mV
−
2.3 −
V
−
100 −
V
−
20
50
nA
September 1993
18