TDA7421N
Electrical specifications
3.4
AM section global performances
Table 6.
AM section global performances
Refer to evaluation circuit.
Input: fc = 999 kHz, f mod = 400 Hz, m = 30 %, 74 dB μVemf antenna level unless otherwise
specified.
Audio output + RC BPF (BPF 20 Hz - 20 kHz)
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
ΔMICC
Total supply current including
mixers
80
mA
VIN MIN Maximum sensitivity
ΔVAF = - 20 dB
13
dBμV
(emf)
VIN US Usable sensitivity
S+N/N = 20 dB
27
dBμV
(emf)
ΔVis
AGC range
ΔVAF = -10 dB
50
dB
S+N/N Signal to noise ratio
VINRF = 74 dBu
54
dB
αIMAG Image rejection
fim = 22.399 MHz, antenna level
@ VΔF = -10 dB
dB
αTw
Tweet, Δ(S+N/N)
f1 = 900 kHz; f2 = 1350 kHz
1.2
dB
0.3
%
THD Total harmonic distortion
m = 80 %
1
%
VAF
VAMST
Audio output level
AM IF2 output level
VINRF = 120 dBμVemf
0.3
%
107
mVRM
S
105
dBμV
3.5
Electrical characteristics
Table 7. Electrical characteristics
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
DC parameters (Tamb = 25 °C; VCC = 8 V, Vdd = 5 V, no RF input unless otherwise specified)
PLL VCC PLL supply voltage
PLL ICC PLL supply current
AM mode
FM mode
7.5
10
V
1.6
mA
3.0
mA
DIG Vdd Digital supply voltage
DIG Idd Digital supply current
AM mode
FM mode
4.75
5.25
V
4.6
mA
4.0
mA
RF VCC RF supply voltage
RF ICC RF supply current
AM mode
FM mode
7.5
10
V
27.0
mA
13.0
mA
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