TDA7540N Datasheet, PDF (19/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)

TDA7540N
Electrical specifications
Table 7.
AM section electrical characteristics (continued)
(T_amb = 25°C, V_CC1 = V_CC2 = V_CC3 = V_CCST= V_CCVCO = V_CCMIX1 = V_CCMIX2 = V_CCIF1 = 8.5V,
f_RF = 98MHz, m= 30%, f_MOD = 400kHz, f_Xtal = 10.25MHz, in application circuit, unless
otherwise specified).
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
A
Max. gain
Mixer2 tank output
34
dB
ΔA
Gain control range
20
dB
C_min
C_max
C_62-63
Min. cap step
Max. cap
IF noise blanking
IF2T
IF2T
IF2T
1.6
pF
24
pF
2
pF
t_bl
t_bl
V_th
V_th
V_thstep
V_desth
V_desth
Min. blanking time
Max. blanking time
Min internal threshold
Max. internal threshold
Threshold step
Min. desensitivity threshold
Max. desensitivity threshold
8
μs
17
μs
10
12.5 15
mV
150 187.5 225
mV
10
12.5 15
mV
2.9
3.2
3.5
V
3.6
4
4.4
V
3.3.4 Stereodecoder
Table 8.
Stereodecoder electrical characteristics
(T_amb = 25°C, V_CC1 = V_CC2 = V_CC3 = V_CCST= V_CCVCO = V_CCMIX1 = V_CCMIX2 = V_CCIF1 = 8.5V,
V_MPX = 500mV_rms mono, f = 1kHz, deemphasis = 50µs, f_Xtal = 10.25MHz, in application
circuit, unless otherwise specified).
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
Stereodecoder
V_in
R_in
G_min
G_max
G_step
SVRR
a
MPX input level
STD Gain = 2.5 dB
Input resistance
Min. Stereodecoder gain
Max. Stereodecoder gain
Stereodecoder gain step
resolution
Supply voltage ripple rejection V_ripple = 100mV, f = 1kHz
Max. channel separation
V_MPX = 500mV_rms stereo
only L/R
THD
(S+N)/N
Total harmonic distortion
Signal plus Noise to Noise
ratio
A-weighted, 19kHz notch
0.5 0.93 V_rms
70
100 130
kΩ
-0.5
0
0.5
dB
3.15 3.75 4.35 dB
1
1.25 1.5
dB
54
60
dB
50
dB
0.02 0.3
%
85
dB
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