TDA7421 データシートの表示（PDF） - STMicroelectronics
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TDA7421 Datasheet PDF : 38 Pages
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TDA7421
ELECTRICAL CHARACTERISTICS (continued)
FM IF Amplifier 1
Ref: FM Test Circuit, measure input at VFMAMP1IN, output at VFMAMP1OUT
Symbol
RIN,AMP1
ROUT,AMP1
GTYP,AMP1
Parameter
Input Resistance
Output Resistance
Typical Gain
GMIN,AMP1 Minimum Gain
GMAX,AMP1 Maximum Gain
IP3AMP1
CP1AMP1
3rd Order Intermodulation
Distortion Intercept Point
1dB Compression Point
Test Condition
Min. Typ. Max. Unit
f = 10.7MHz
330
Ω
f = 10.7MHz
330
Ω
fIN = 10.7MHz, FBH3-0 set to
0100
16.5 17.5 18.5 dB
fIN = 10.7MHz, FBH3-0 set to
0001
14.5 15.5 16.5 dB
fIN = 10.7MHz, FBH3-0 set to
0000
18.5 19.5 20.5 dB
fd = 10.7MHz; fu1= 10.8MHz; fu2=
109
dBu
10.9MHz, FBH3-0 set to 0100
fIN = 10.7MHz; FBH3-0 set to
0100
96
dBu
FM IF Amplifier 2
Ref: FM Test Circuit, measure input at VFMAMP2IN, output at VFMAMP2OUT
Symbol
RIN,AMP2
ROUT,AMP2
GTYP,AMP2
GMIN,AMP2
GMAX,AMP2
IP3AMP2
CP1AMP2
Parameter
Input Resistance
Output Resistance
Typical Gain
Minimum Gain
Maximum Gain
3rd Order Intermodulation
Distortion Intercept Point
1dB Compression Point
Test Condition
Min. Typ. Max. Unit
f = 10.7MHz
330
Ω
f = 10.7MHz
330
Ω
fIN = 10.7MHz, FBL3-0 set to 0100 5
6
7
dB
fIN = 10.7MHz, FBL3-0 set to 0001 3
4
5
dB
fIN = 10.7MHz, FBL3-0 set to 0000 7
8
9
dB
fd = 10.7MHz; fu1= 10.8MHz; fu2=
122
dBu
10.9MHz, FBL3-0 set to 0100
fIN = 10.7MHz; FBL3-0 set to 0100
110
dBu
FM Limiter, Field Strengh Meter and Demodulator
Ref: FM Test circuit, measure:
- Input at VFMLIMIN, fIN = 10.7MHz
- filtered FS Meter output at VSM,FILT
- shifted FS Meter output at VSM,SHIFT (FMADJ set to 0)
- demodulator adjustment output at VSM,SHIFT (FMADJ set to 1)
Symbol
RIN,LIM
GLIM
LS
SM1
SM2
SM3
SMMINSHIFT
SMMAXSHIFT
GDEM
Parameter
Limiter Input Resistance
Limiter Gain
Limiting Sensitivity
Smeter 1 at VSM,FILT
Smeter 2 at VSM,FILT
Smeter 3 at VSM,FILT
Smeter Minimum Shift Voltage at
VSM,SHIFT referred to VSM,FILT
Smeter Maximum Shift Voltage
at VSM,SHIFT referred to VSM,FILT
Demodulator Conversion Gain
Test Condition
VFMLIMIN = 42dBu
VFMLIMIN = 77dBu
VFMLIMIN = 102dBu
VFMLIMIN = 70dBu, FSL4-0 set to
00000
VFMLIMIN = 70dBu, FSL4-0 set to
11111
VFMLIMIN > LS
Min.
0.1(1)
2.4(1)
4.0(1)
0.25
Typ.
330
90
23
0.25
2.75
4.35
0.3
1.55 1.8
2
GDEMADJ Demodulator Adjustment
VFMLIMIN > LS, measured at
14
Conversion Gain
VSMSHIFT, FMADJ set to 1
NOTE1: Refer to Global application circuit; input at first Ceramic Filter in, FBH3-0 set to 0001, FBL3-0 set to 0001
Max.
0.5(1)
3.1(1)
4.7(1)
0.35
Unit
Ω
dB
dBu
V
V
V
V
2.05 V
mVRMS/
KHz
mVRMS/
KHz
7/38
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