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| TDA7421N Datasheet, PDF (9/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS | |||
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TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
FM IF Amplifier 1
Ref: FM Test Circuit, measure input at VFMAMP1IN, output at VFMAMP1OUT
Symbol
Parameter
Test Condition
RIN,AMP1 Input Resistance
ROUT,AMP1 Output Resistance
GAMP1 Typical Gain
fIN = 10.7MHz
IP3AMP1 3rd Order Intermodulation
Distortion Intercept Point
fd = 10.7MHz; fu1= 10.8MHz;
fu2= 10.9MHz;
FBH3-0 set to 0100
CP1AMP1 1dB Compression Point
fIN = 10.7MHz;
FBH3-0 set to 0100
FM IF Amplifier 2
Ref: FM Test Circuit, measure input at VFMAMP2IN, output at VFMAMP2OUT
RIN,AMP2 Input Resistance
f = 10.7MHz
ROUT,AMP2 Output Resistance
f = 10.7MHz
GMIN,AMP2 Minimum Gain
fIN = 10.7MHz, FBL1-0 set to 01
GMAX,AMP2 Maximum Gain
fIN = 10.7MHz, FBL1-0 set to 00
IP3AMP2 3rd Order Intermodulation
Distortion Intercept Point
fd = 10.7MHz; fu1= 10.8MHz;
fu2= 10.9MHz;
FBL3-0 set to 0100
CP1AMP2 1dB Compression Point
fIN = 10.7MHz;
FBL3-0 set to 0100
FM Limiter, Field Strengh Meter and Demodulator
Ref: FM Test circuit, measure:
- Input at VFMLIMIN, fIN = 10.7MHz
- 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
GLIM
Limiter Gain
LS
Limiting Sensitivity
SM1
SM2
Smeter 1
Smeter 2
VFMLIMIN = 40dBµV
VFMLIMIN = 60dBµV
SM3 Smeter 3
VFMLIMIN = 80dBµV
SM4 Smeter 4
VFMLIMIN = 100dBµV
SMMINSHIFT Smeter Minimum Shift Voltage
VFMLIMIN = 70dBµV;
FSL4-0 set to 00000
SMMAXSHIFT Smeter Maximum Shift Voltage VFMLIMIN = 70dBµV;
FSL4-0 set to 11111
Min.
Typ.
330
330
18.5
330
330
6
10
330
90
23
1.1
2.3
3.7
4.9
0.0
1.5
Max.
Unit
â¦
â¦
dB
dBµV
dBµV
â¦
â¦
dB
dB
dBµV
dBµV
â¦
dB
dBµv
V
V
V
V
V
V
9/38
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