TDA7786 datasheet(40/54 Pages) STMICROELECTRONICS

40 / 54 page

Electrical specifications

TDA7786, TDA7786M

40/54

DocID026122 Rev 5

3.5.5

WX overall system performance

Antenna level equivalence: 0 dBµV = 1 µVrms (Antenna terminal voltage with 75

 dummy

load).

Figure 23. WX input set-up

Input level referred to 75

 dummy antenna output; antenna dummy as shown above.

Frf = 162.475 MHz, Vrf = 60 dBµV, mono modulation, fdev = 3 kHz, faudio = 400 Hz audio.

De-emphasis = 75 µs. Application WX using mixer input 2.Unless otherwise specified.

Table 29. AM SW overall system performance

Parameter

Test condition

Min

Typ

Max

Units

Tuning range SW

(can be modified by the user)

2300

30000

kHz

Tuning step SW

(can be modified by the user)

kHz

Sensitivity

S/N = 20 dB

dBµV

Ultimate S/N

@ 80 dBµV

AGC F.O.M.

Ref.=74 dBµV

-10 dB drop point

(1)

1. Programmable by software parameters.

Distortion

M = 80%

0.1

0.2

Image rejection

Table 30. WX overall system performance

Parameter

Test condition

Min

Typ

Max

Units

Sensitivity

S/N = 26 dB

-6

-3

dBµV

Ultimate S/N

@ 60 dBµV

Distortion

Deviation= 4.5 kHz

0.8

Max deviation

THD = 3%

kHz

Adjacent channel Selectivity

∆F = 25 kHz, SINAD = 30dB

desired 40 dBµV,

dev = 2.0 kHz, 400 Hz

undesired Dev = 2.0 kHz,

1 kHz

Alternate Channel Selectivity

∆F = 50 kHz, SINAD = 30dB

desired 40 dBµV,

dev = 2.0 kHz, 400 Hz

undesired Dev = 2.0 kHz,

1 kHz

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