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參數(shù)資料
| 型號(hào)： | TDA7421 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS |
| 中文描述： | AM / FM調(diào)諧的汽車收音機(jī)及音響應(yīng)用 |
| 文件頁(yè)數(shù)： | 6/38頁(yè) |
| 文件大?。?/td> | 527K |
| 代理商： | TDA7421 |
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Symbol
S+N/N
THD
V
O AF
US
Parameter
Test Condition
Min.
Typ.
68
0.3
400
4
Max.
Uni
dB
%
mV
RMS
dBu
Signal to Noise Ratio
Total Harmonic Distortion
Audio Output Level
Usable Sensitivity
deviation = 40KHz
350
450
antenna level at which
S+N/N=30dB
AGC
range
Range AGC FM
65
dB
ELECTRICAL CHARACTERISTICS
(continued)
FM Section Global Performances
Refer to Evaluation Circuit and enclosed curves (S+N/N, THD)
- RF Input: f
c
= 98.1MHz, 75KHz dev., 1KHz mod.,60dBu
- Audio Output: BPF 20Hz - 20KHz
FM AGC
Ref: FM Test Circuit, measure input at V
FMRFAGCIN
, and V
FMIFAGCIN
, output at V
FMAGCOUT
Symbol
V
RFAGCSTART
Parameter
Test Condition
Min.
74
Typ.
80
Max.
86
Unit
dBu
Open Loop Rf Agc Starting Point
f
RFAGCIN
= 98.1MHz Value of
V
FMRFAGCIN
, at which
V
FMAGCOUT
= 4V
R
INRFAGC
V
IFAGCSTART
Input Resistance
Open Loop If Agc Starting Point
20
77
K
dBu
f
IFAGCIN
= 10.7MHz Value of
V
FMIFAGCIN
, at which
V
FMAGCOUT
= 4V
FAGC2-0 set to 111
71
83
R
INIFAGC
R
OUTFMAGC
Input Resistance
Output Resistance
20
10
K
K
FM Mixer
Ref: FM Test Circuit, measure input at V
MIXFMIN
, output at V
MIXOUT
Symbol
Z
IN,MIX
Parameter
Test Condition
Min.
Typ.
12
Max.
Unit
Single-ended input impedance
(pin 3, pin4)
Conversion Gain
3rd order intermodulation
distortion intercept point
1dB compression point
f = 100MHz
G
MIX
IP3
MIX
f
IN
= 98.1MHz
f
d
= 98.1MHz; f
u1
= 98.2MHz;
f
u2
= 98.3MHz;
f
IN
= 98.1MHz
21.8
104
dB
dBu
CP1
MIX
90
dBu
Symbol
ANTADJ
MAX OFF
ANTADJ
STEP OFF
RFADJ
MAX OFF
RFADJ
STEP OFF
Parameter
Test Condition
Min.
21
Typ.
25
Max.
27
Uni
%
Maximum FM Antenna Filter
Adjustment Voltage Offset
FM Antenna Filter Adjustment
Voltage Offset Step
Maximum FM RF Filter
Adjustment Voltage Offset
FM RF Filter Adjustment Voltage
Offset Step
V
PLLOUT
= 2.5V, ANA3-0 set to
1111
V
PLLOUT
= 2.5V, ANA3-0 set to
1001
V
PLLOUT
= 2.5V, RFA3-0 set to
1111
V
PLLOUT
= 2.5V, RFA3-0 set to
1001
2.8
3.6
4.4
%
21
25
27
%
2.8
3.6
4.4
%
FM Front-end Electrical Adjustments
Ref: FM Test Circuit measure V
ANTADJ
and V
RFADJ
referred to V
PLLOUT
TDA7421
6/38
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