TDA7421 Datasheet, PDF (8/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

TDA7421
ELECTRICAL CHARACTERISTICS (continued)
FM Audio Amplifier
Ref: FM Test circuit, measure:
- Input at VFMLIMIN, = 95dBu, fIN = 10.7MHz
- audio output at VAUDIO, BPF 20Hz to 20KHz
- muting voltage at VMUTE, DRIVE
Symbol
VMUTE
Parameter
Mute Voltage
VPLAY
Play Voltage
GAMP,PLAY
GAMP,MUTEMAX
GAMP,MUTEMIN
VAF
Audio Amplifier Gain in Play
Conditions
Audio Amplifier Highest Gain in
Mute Condition
Audio Amplifier Lowest Gain in
Mute Condition
AF Output Level
THD
AFTotal Harmonic distortion
S+N/N AF Signal to Noise Ratio
AMR
Amplitude Modulation Rejection
AUDIO_curr Audio Out Current Capability
MUTE Rout Mute Drive Output Resistance
Test Condition
VMUTE,DRIVE for which ∆VAF = -
29dB, FMHIGH set to 0, AUM2-0
set to 111
VMUTE,DRIVE for which ∆VAF = -
1dB, FMHIGH set to 0, AUM2-0
set to 111
VMUTE,DRIVE < VPLAY
Min.
2
Typ.
9
VMUTE,DRIVE > VMUTE, FMHIGH
6.5
set to 1, AUM2-0 set to 001
VMUTE,DRIVE > VMUTE, FMHIGH
set to 0, AUM2-0 set to 111
fDEV = 75KHz, FMOD = 1KHz,
VMUTE,DRIVE < VMUTE
-21
350⁽¹⁾ 400
fDEV = 75KHz, FMOD = 1KHz,
0.5
VMUTE,DRIVE < VMUTE
fDEV = 75KHz, FMOD = 1KHz,
68⁽¹⁾
75
VMUTE,DRIVE < VMUTE
AM modulation deph 30%, fMOD = 60⁽¹⁾ 67
1KHz, with respect to FM
modulated signal with fDEV =
40KHz, VMUTE,DRIVE < VMUTE
5
1
NOTE1: Refer to Global application circuit; input at first Ceramic Filter in, FBH3-0 set to 0001, FBL3-0 set to 0001
Max. Unit
V
0.3
V
dB
dB
dB
450⁽¹⁾ mV_RMS
%
%
dB
mA
KΩ
FM QUALITY DETECTORS
Field Strength Detector
Ref: FM Test Circuit, measure:
- Input at VFMLIMIN, fIN = 10.7MHz, CW
- output at VMUTE,DRIVE
Symbol
FSDMIN
FSDMAX
Parameter
Field Strenght Detector Minimum
Threshold
Field Strenght Detector Maximum
Test Condition
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0 set
to 0000
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0 set
to 1111
Min.
Typ.
40
60
Max.
Unit
dBu
dBu
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