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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(yè)數(shù)： | 10/47頁(yè) |
| 文件大?。?/td> | 374K |
| 代理商： | TDA7421N |
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Electrical specifications
TDA7421N
GIF2AMPMIN Minimum gain
VIF2AMPIN = 10 dBμV;
IF2A1-0 set to 00
50
dB
GIF2AMPMAX Maximum gain
VIF2AMPIN = 10 dBμV;
IF2A1-0 set to 11
59
dB
AGCAMPSP AGC2 starting point on IF2 amp
Value of VIF2AMPIN for which
VIF2AMPOUT is 1dB
compressed, IF2A1-0 set to 01
60
dB
μV
AGCAMPR AGC2 range on IF2 amp
fIN = 10.7MHzRange of
VIF2AMPIN above AGCAMPSP for
which VIF2AMPOUT is not
increasing linearly with a
1dB/dB slope; IF2A1-0 set to 01
33
dB
AGCAMPIS
AGC2 intervention slope on IF2
amp
fIN = 10.7MHz; ΔVIF2AMPOUT for
ΔV
IF2AMPIN = 1dB;
IF2A1-0 set to 1
0.1
dB/dB
AGCTCR
AGC2 time constant ratio
Ratio of AGC2 "reception" Time
Constant and "seek" Time
Constant
150/5
s/s
IFAMST
AM IF2 output level at pin 28
VIF2AMPIN = 72dBmV;
AMSTEREO set to 1
106
dB
μV
IFAMSTcurr Current capability of pin 28
AMSTEREO set to 1
150
μA
AM Field strength meter and field strength station detector
Ref: AM test circuit; fIN = 10.7 MHz, measure input at VMIX2AMIN, outputs at VAMSMETER and at VAMSD (switches in
position 2).
AMSM1
AM smeter 1 at VAMSMETER
VMIX2AMIN = 40dBμV1.4
V
AMSM2
AM smeter 2 at VAMSMETER
VMIX2AMIN = 60dBμV3.4
V
AMSM3
AM smeter 3 at VAMSMETER
VMIX2AMIN = 80dBμV4.8
V
AMSDMIN
Station detector minimum
threshold
VMIX2AMIN at which VAMSD =
2.5V; ASS3-0 set to 0000, SEEK
set to 1
27
dB
μV
AMSDMAX
Station detector maximum
threshold
VMIX2AMIN at which VAMSD =
2.5V; ASS3-0 set to 1111, SEEK
set to 1
dB
μV
IF counter output
Ref: AM & FM test circuit, measure at pin 28
IFCFM
FM IFC sensitivity
VFMLIMIN at which Vpin 28 =
2.5V, SEEK set to 1, EW2-0 set
to 101, IFS2-0 set to 010
34
dB
μV
IFCAM
AM IFC sensitivity
VIF2AMPIN at which Vpin 28 =
2.5V, SEEK set to 1, EW2-0 set
to 011, IF2-0 set to 100, AMFM
STBY1-0 set to 10
29
dB
μV
IFCcurrent
IFC current capability
150
μA
Table 7.
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
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