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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)： | 6/47頁 |
| 文件大?。?/td> | 374K |
| 代理商： | TDA7421N |
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Electrical specifications
TDA7421N
FM limiter, field strength meter and demodulator
Ref: FM test circuit, measure:
– Input at VFMLIMIN, fIN = 10.7 MHz
– FS meter output at VFMSMETER (FMADJ set to 0, FSL4-0 set to 00000)
– demodulator adjustment output at VFSMETER (FMADJ set to 1)
RIN,LIM
Limiter input resistance
330
Ω
GLIM
Limiter gain
90
dB
LS
Limiting sensitivity
23
dB
μv
SM1
Smeter 1
VFMLIMIN = 40 dBμV1.1
V
SM2
Smeter 2
VFMLIMIN = 60 dBμV2.3
V
SM3
Smeter 3
VFMLIMIN = 80 dBμV3.7
V
SM4
Smeter 4
VFMLIMIN = 100 dBμV4.9
V
SMMin shift Smeter minimum shift voltage
VFMLIMIN = 70 dBμV;
FSL4-0 set to 00000
0.0
V
SMMax shift Smeter maximum shift voltage
VFMLIMIN = 70 dBμV;
FSL4-0 set to 11111
1.5
V
GDEM
Demodulator conversion gain
VFMLIMIN > LS
2
mVRMS/
kHz
GDEMADJ
Demodulator adjustment
conversion gain
VFMLIMIN > LS
14
mVRMS/
kHz
CAdjDem
Value of the minimum adjusting
capacitance step
DEM6-0 set to 0000001
50
fF
FM audio amplifier
Ref: FM test circuit, VFMLIMIN, = 95 dBμV, fIN = 10.7 MHz; measure:
– MPX output at VAUDIO, BPF 200 Hz to 15 kHz, 50 μs de-emphasis.
– muting voltage at VMUTE, DRIVE
VMUTE
Mute voltage
VMUTE,DRIVE for which
ΔV
AF = -11.5dB;
AUM1-0 set to 11
2V
VPLAY
Play voltage
VMUTE,DRIVE for which
ΔV
AF = -1dB, AUM1-0 set to 11
0.3
V
GAMP,PLAY
Audio amplifier gain in play
conditions
VMUTE,DRIVE < VPLAY
9dB
MUTEATT
MIN
Minimum mute attenuation
VMUTE,DRIVE > VMUTE;
AUM1-0 set to 00
-5
dB
MUTEATT
MAX
Maximum mute attenuation
VMUTE,DRIVE > VMUTE;
AUM1-0 set to 11
-12.5
dB
VAF
AF output level
fDEV = 75KHz, FMOD = 1 kHz,
VMUTE,DRIVE < VMUTE
400
mVRMS
THD
AF total harmonic distortion
fDEV = 40 kHz, FMOD = 1 kHz,
VMUTE,DRIVE < VMUTE
0.3
%
Table 7.
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
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