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TDA7421 数据表(PDF) 8 Page - STMicroelectronics

部件名 TDA7421
功能描述  AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS
Download  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7421 数据表(HTML) 8 Page - STMicroelectronics

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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
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VMUTE
Mute Voltage
VMUTE,DRIVE for which
∆VAF = -
29dB, FMHIGH set to 0, AUM2-0
set to 111
2V
VPLAY
Play Voltage
VMUTE,DRIVE for which
∆VAF = -
1dB, FMHIGH set to 0, AUM2-0
set to 111
0.3
V
GAMP,PLAY
Audio Amplifier Gain in Play
Conditions
VMUTE,DRIVE < VPLAY
9dB
GAMP,MUTEMAX Audio Amplifier Highest Gain in
Mute Condition
VMUTE,DRIVE > VMUTE, FMHIGH
set to 1, AUM2-0 set to 001
6.5
dB
GAMP,MUTEMIN
Audio Amplifier Lowest Gain in
Mute Condition
VMUTE,DRIVE > VMUTE, FMHIGH
set to 0, AUM2-0 set to 111
-21
dB
VAF
AF Output Level
fDEV = 75KHz, FMOD = 1KHz,
VMUTE,DRIVE < VMUTE
350
(1)
400
450
(1)
mVRMS
THD
AFTotal Harmonic distortion
fDEV = 75KHz, FMOD = 1KHz,
VMUTE,DRIVE < VMUTE
0.5
%
S+N/N
AF Signal to Noise Ratio
fDEV = 75KHz, FMOD = 1KHz,
VMUTE,DRIVE < VMUTE
68
(1)
75
%
AMR
Amplitude Modulation Rejection
AM modulation deph 30%, fMOD =
1KHz, with respect to FM
modulated signal with fDEV =
40KHz, VMUTE,DRIVE < VMUTE
60
(1)
67
dB
AUDIOcurr
Audio Out Current Capability
5
mA
MUTE Rout
Mute Drive Output Resistance
1
K
NOTE1: Refer to Global application circuit; input at first Ceramic Filter in, FBH3-0 set to 0001, FBL3-0 set to 0001
FM QUALITY DETECTORS
Field Strength Detector
Ref: FM Test Circuit, measure:
- Input at VFMLIMIN, fIN = 10.7MHz, CW
- output at VMUTE,DRIVE
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
FSDMIN
Field Strenght Detector Minimum
Threshold
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0 set
to 0000
40
dBu
FSDMAX
Field Strenght Detector Maximum
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0 set
to 1111
60
dBu
TDA7421
8/38


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