TDA7421N Datasheet, PDF (6/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

TDA7421N
FM SECTION GLOBAL PERFORMANCES
Refer to Evaluation Circuit
– Input 98.1MHz, 40KHz dev., 1KHz mod., 60dBµV antenna level, mono.
– MPX Output, de-enphasis 50µs, BPF 200Hz-15KHz.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
FM I_CC Total Supply Current Including
Mixer
90
mA
S+N/N Signal to Noise Ratio
66
dB
THD Total Harmonic Distortion
0.3
%
V_{O AF} Audio Output Level
75kHz Deviation
400
mV_RMS
US₁
Usable Sensitivity (40dB)
antenna level at which
S+N/N = 40dB
0
dBµV
US₂
Usable Sensitivity (26dB)
antenna level at which
S+N/N = 26dB
-6
dBµV
AGC_SP AGC Starting point
55
dBµV
AM SECTION GLOBAL PERFORMANCES
Refer to Evaluation Circuit
- Input: fc = 999KHz, f mod = 400Hz, m = 30%, 74dBµV_emf antenna level unless otherwise specified.
- Audio Output + RC BPF (BPF 20Hz - 20KHz)
∆MI_CC
Total supply current including
mixers
80
mA
V_{IN MIN} Maximum Sensitivity
∆V_AF = - 20dB
13
dBµV
(emf)
V_{IN US} Usable Sensitivity
S+N/N = 20dB
27
dBµV
(emf)
∆V_is
AGC Range
∆V_AF = -10dB
50
dB
S+N/N Signal to Noise Ratio
V_INRF = 74dBu
54
dB
α_IMAG Image Rejection
f_im = 22.399MHz, antenna level
dB
@ V_∆F = -10dB
α_Tw
Tweet, ∆(S+N/N)
f1 = 900KHz;f2 = 1350KHz
1.2
dB
THD Total Harmonic Distortion
0.3
%
m = 80%
1
%
V_INRF = 120dBµV_emf
0.3
%
V_AF
Audio Output Level
107
mV_RMS
V_AMST AM IF2 Output level
105
dBµV
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