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| TDA7541 Datasheet, PDF (19/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system | |||
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TDA7541
Electrical specifications and characteristics
Table 7. AM section (continued)
(Tamb = 25°C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5V, fXtal = 10.25 MHz, fRF = 1
MHz, m = 30%, fmod = 1 kHz, in application circuit, unless otherwise specified)
Item Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
23.9
V23
24. AMAGC2
IF2 output voltage
V56 = 90dBµ, m=off
140 190 240 mVRMS
24.1 VAGC(start) AGC start voltage (PIN47) Input carrier voltage
24.2 ÎAGC AGC2 range
Between start of AGC2
and the intervention point
of prestage AGC
24.3 gAGC Control slope
Seek mode
24.4 gAGC Control slope
normal mode
24.5
II57I Max. AGC charge current Seek mode
24.6 II57I Max. AGC charge current normal mode
24.7
V57 Max. AGC output voltage V47 = 100dBµ
24.8
V57 Min. AGC output voltage V47 = 20dBµ
25. AM audio output
62
dBµV
50 55
dB
50
µA/V
5
µA/V
125
μA
5
μA
4.6 4.8
V
0.2 0.5
V
25.1
V43 Audio output voltage
25.2
THD Total harmonic distortion
25.3
25.4 ROUT Output impedance
26. IF noise blanking
V56 = 90dBµ, m = 30%,
fmod = 1KHz
V56 = 90dBµ, m = 30%,
fmod = 1KHz
V56 = 90dBµ, m = 80%,
fmod = 1KHz
170 200 230 mVRMS
0.3 0.5
%
0.5 0.9
20 25 30
Ω
26.1
tbl
Min. blanking time
26.2
tbl
Max. blanking time
26.3
Vth Min internal threshold
26.4
Vth Max. internal threshold
26.5 Vthstep Threshold step
1. Can be reached in application circuit, not measured.
8
μs
17
μs
50
mV
187.5
mV
12.5
mV
19/76
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