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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)： | 8/47頁 |
| 文件大小： | 374K |
| 代理商： | TDA7421N |
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Electrical specifications
TDA7421N
ACDMIN
Adjacent channel quality
detector minimum sensitivity
threshold
amplitude of undesired signal at
which VMUTE,DRIVE = VPLAY,
HDM4-0 set to 00000
94.8
dBu
Field strength station detector
Ref: FM Test circuit; SEEK set to 1, HDDIS and BWDIS set to 1, measure:
– Input at VFMLIMIN: desired 10.7MHz, CW
– Output at VFMSD
FSSDMIN
Field strength station detector
minimum threshold
VFMLIMIN level at which
VFMSD = 2.5V;
FSS4-0 set to 00000
dB
μV
FSSDMAX
Field strength station detector
maximum threshold
VFMLIMIN level at which
VFMSD = 2.5V;
FSS4-0 set to 11111
dB
μV
Detuning station detector
Ref: FM test circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
– Input at VFMLIMIN, CW;
– Output at VFMSD
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DSD
Detuning Station Detector
Threshold
frequency shift from 10.7MHz at
which VFMSD = 2.5V
±28
KHz
Adjacent channel station detector
Ref: FM test circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
- Input at VFMLIMIN: desired 10.7MHz, 95dBμV CW; undesired 10.8MHz CW
- output at VFMSD
ACSDMAX
Adjacent channel detector
maximum sensitivity threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0
set to 11111
92.5
dB
μV
ACSDMIN
Adjacent channel detector
minimum sensitivity threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0
set to 00000
94.9
dB
μV
AM mixer 1
Ref: AM test circuit, measure input at VMIX1AMIN, output at VMIXOUT
RIN,MIX1
Input resistance
1.2
K
Ω
GMIX1
Conversion gain
fIN = 1 MHz
7.6
dB
IP3MIX1
3rd order intermodulation
distortion intercept point
fd = 1MHz; fu1 = 1.1MHz;
fu2 = 1.2MHz
131
dB
μV
CP1MIX1
1dB compression point
fIN = 1MHz
110
dB
μV
CAdj1
Value of the minimum adjusting
capacitance step
T1A3-0 set to 1000
0.38
pF
Table 7.
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
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