TDA7421N datasheet(9/38 Pages) STMICROELECTRONICS

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TDA7421N

FM IF Amplifier 1

Ref: FM Test Circuit, measure input at VFMAMP1IN, output at VFMAMP1OUT

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

RIN,AMP1

Input Resistance

330

Ω

ROUT,AMP1

Output Resistance

330

Ω

GAMP1

Typical Gain

fIN = 10.7MHz

18.5

IP3AMP1

3rd Order Intermodulation

Distortion Intercept Point

fd = 10.7MHz; fu1= 10.8MHz;

fu2= 10.9MHz;

FBH3-0 set to 0100

µV

CP1AMP1

1dB Compression Point

fIN = 10.7MHz;

FBH3-0 set to 0100

µV

FM IF Amplifier 2

Ref: FM Test Circuit, measure input at VFMAMP2IN, output at VFMAMP2OUT

RIN,AMP2

Input Resistance

f = 10.7MHz

330

Ω

ROUT,AMP2

Output Resistance

f = 10.7MHz

330

Ω

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

µV

CP1AMP2

1dB Compression Point

fIN = 10.7MHz;

FBL3-0 set to 0100

µV

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

330

Ω

GLIM

Limiter Gain

Limiting Sensitivity

µv

SM1

Smeter 1

VFMLIMIN = 40dBµV

1.1

SM2

Smeter 2

VFMLIMIN = 60dBµV

2.3

SM3

Smeter 3

VFMLIMIN = 80dBµV

3.7

SM4

Smeter 4

VFMLIMIN = 100dBµV

4.9

SMMINSHIFT Smeter Minimum Shift Voltage

VFMLIMIN = 70dBµV;

FSL4-0 set to 00000

0.0

SMMAXSHIFT Smeter Maximum Shift Voltage

VFMLIMIN = 70dBµV;

FSL4-0 set to 11111

1.5

ELECTRICAL CHARACTERISTICS (Continued)

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