tda7421n STMicroelectronics, tda7421n Datasheet - Page 10

• Manufacturer Part Number: tda7421n
• Description: Am/fm Tuner For Car Radio And Hi-fi Applications
• Manufacturer: STMicroelectronics

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
10/38
FM Audio Amplifier
Ref: FM Test circuit, V
- MPX output at V
- muting voltage at V
FM QUALITY DETECTORS
Field Strength Detector
Ref: FM Test Circuit, HDDIS and BWDIS set to 1, measure:
- Input at V
- output at V
MUTEATT
MUTEATT
MUTE R
AUDIO
G
G
CAdjDem
Symbol
FSD
V
S+N/N
G
V
AMP,PLAY
DEMADJ
AMR
THD
MUTE
V
PLAY
DEM
AF
MIN
curr
MAX
MIN
out
FMLIMIN
MUTE,DRIVE
Demodulator Conversion Gain
Demodulator Adjustment
Conversion Gain
Value of the minimum adjusting
capacitance step
Mute Voltage
Play Voltage
Audio Amplifier Gain in Play
Conditions
Minimum Mute Attenuation
Maximum Mute Attenuation
AF Output Level
AF Total Harmonic distortion
AF Signal to Noise Ratio
Amplitude Modulation Rejection
Output Current Capability
Mute Drive Output Resistance
Field Strength Detector
Minimum Threshold
AUDIO
, f
IN
MUTE, DRIVE
FMLIMIN
= 10.7MHz, CW
, BPF 200Hz to 15KHz, 50 s de-emphasis.
Parameter
, = 95dB V, f
IN
= 10.7MHz; measure:
V
V
DEM6-0 set to 0000001
V
AUM1-0 set to 11
V
V
V
AUM1-0 set to 00
V
AUM1-0 set to 11
f
V
f
V
f
V
AM modulation depht 30%,
f
modulated signal with f
40KHz, V
V
V
set to 0000
DEV
DEV = 40KHz, FMOD = 1KHz,
DEV
MOD
V
V
FMLIMIN
FMLIMIN
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
FMLIMIN
MUTE,DRIVE
AF
AF
= 75KHz, F
= 40KHz, F
= -11.5dB;
= -1dB, AUM1-0 set to 11
= 1KHz, with respect to FM
Test Condition
> LS
> LS
MUTE,DRIVE
level at which
for which
for which
< V
> V
> V
< V
< V
< V
= V
MOD
MOD
PLAY
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
= 1KHz,
= 1KHz,
< V
;
;
, FSM3-0
DEV
MUTE
=
Min.
2
5
-12.5
Typ.
400
0.3
14
50
80
67
-5
2
9
1
Max.
0.3
mV
mV
mV
dB V
Unit
KHz
KHz
mA
K
dB
dB
dB
dB
dB
fF
%
V
V
RMS
RMS
RMS
/
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