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參數(shù)資料
| 型號(hào)： | TDA7421N |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | TQFP-64 |
| 文件頁數(shù)： | 7/47頁 |
| 文件大?。?/td> | 374K |
| 代理商： | TDA7421N |
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TDA7421N
Electrical specifications
S+N/N
AF signal to noise ratio
fDEV = 40 kHz, FMOD = 1 kHz,
VMUTE,DRIVE < VMUTE
80
dB
AMR
Amplitude modulation rejection
AM modulation depht 30 %,
fMOD = 1 kHz, with respect to
FM modulated signal with fDEV
= 40KHz, VMUTE,DRIVE < VMUTE
67
dB
AUDIOcurr Output current capability
5
mA
MUTE Rout Mute drive output resistance
1
K
Ω
FM quality detectors
Field strength detector
Ref: FM test circuit, HDDIS and BWDIS set to 1, measure:
– Input at VFMLIMIN, fIN = 10.7 MHz, CW
– output at VMUTE,DRIVE
FSDMIN
Field strength detector
minimum threshold
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0
set to 0000
dB
μV
FSDMAX
Field strength detector
maximum threshold
VFMLIMIN level at which
VMUTE,DRIVE = VMUTE, FSM3-0
set to 1111
67.5
dB
μV
Detuning detector
Ref: FM test circuit; HDDIS and SMDIS set to 1, measure:
– Input at VFMLIMIN, CW
– output at VMUTE,DRIVE
DDSTART
Detuning detector starting point
frequency shift from 10.7 MHz
at which VMUTE,DRIVE = VPLAY
±23
kHz
DDSlope,min
Detuning detector minimum
muting slope
frequency shift from 10.7MHz +
DDSTART at which
VMUTE,DRIVE = VMUTE,
BWM2-0 set to 100, SEEK set to 0
30
kHz
DDSlope,max
Detuning detector maximum
muting slope
frequency shift from 10.7 MHz +
DDSTART at which
VMUTE,DRIVE = VMUTE,
BWM2-0 set to 001, SEEK set to 0
10
kHz
DDTRC
Detuning Detector Time
Constant Ratio
ratio of "reception" mode
integration time constant inside
the Detuning Detector with
respect to "seek" mode
34/6
s/s
Adjacent channel detector
Ref: FM test circuit; BWDIS and SMDIS set to 1, measure:
– Input at VFMLIMIN: desired 10.7 MHz, 95 dBμV CW; undesired 10.8 MHz CW
– output at VMUTE,DRIVE
ACDMAX
Adjacent channel quality
detector maximum sensitivity
threshold
amplitude of undesired signal at
which VMUTE,DRIVE = VMUTE,
HDM4-0 set to 11111
91
dBu
Table 7.
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
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