TDA7541 Datasheet, PDF (17/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

TDA7541
Electrical specifications and characteristics
Table 6. FM section (continued)
(T_amb = 25°C, V_CC1 = V_CC2 = V_CCMIX1 = V_CCVCO = V_CCIF = 8.5V, f_Xtal = 10.25 MHz,
f_RF = 98MHz, dev = 40 kHz, f_Mod = 1 kHz, in application circuit, unless otherwise specified)
Item Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
16.3
16.4
R_OUT Output resistance
R_23load Load resistor
200 250 300 Ω
20
kΩ
Table 7. AM section
(T_amb = 25°C, V_CC1 = V_CC2 = V_CCMIX1 = V_CCVCO = V_CCIF = 8.5V, f_Xtal = 10.25 MHz, f_RF = 1
MHz, m = 30%, f_mod = 1 kHz, in application circuit, unless otherwise specified)
Item Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
17. Global
17.1
17.2
V_{ANT_US} Usable sensitivity ⁽¹⁾
(S+N)/N Signal to Noise Ratio
17.3
a_IF IF1 rejection
17.4
V₃ Min. RF AGC threshold
17.5
V₃ Max. RF AGC threshold
17.6
V₆₁ Min. IF AGC threshold
17.7
V₆₁ Max. IF AGC threshold
17.8
V₅₆ Min. DAGC threshold
17.9
V₅₆ Max. DAGC threshold
18. AGC voltage driver output
18.1
V₄ Max. AGC output voltage
18.2
V₄ Min. AGC output voltage
18.3
| I_{4 |} AGC current
19. AGC PIN diode driver output
19.1
I₇
AGC driver current
20. AM Mixer1 (10.7MHz)
20.1
R_IN Input resistance
20.2
C_IN Input capacitance
20.3 R_OUT Output impedance
20.4 CP_1dB 1dB compression point
20.5
V_3,6 Input DC bias
20.6
IIP3 3^rd order intermodulation
20.7 INOISE Equivalent input noise
20.8
G Gain
(S+N)/N = 26 dB
Ref.: V₃ = 80dB∝V
S/N=26dB, m=30%, f_mod =1kHz
RFAGC
IFAGC
DAGC
V_{4=0V, V54 = 3.5V, LNA”00”}
differential
differential
referred to diff. mixer input
With 330Ω filter
19 25 dBµV
50 55
dB
70 80
dB
92
dBµV
104
dBµV
78
dBµV
102
dBµV
86
dBµV
98
dBµV
3.3 3.5
V
0.5
V
340
µA
-15 mA
45
kΩ
tbd
pF
530 660 790
Ω
112
dBμV
0.3 0.4 0.55 V
132
dBμV
5.5
nV/√Hz
3
5.5
7
dB
17/76