TDA7705 datasheet(25/42 Pages) STMICROELECTRONICS

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TDA7705

Electrical specifications

Doc ID 15938 Rev 9

25/42

3.5.2

AM MW overall system performance

Antenna level equivalence: 0 dBµV = 1 µVrms.

Figure 11.

AM MW input set up

Level referred to SG output before antenna dummy (Vrf, node 'A'); capacitive dummy

15pF+68pF, FM input not connected. Frf = 999 kHz (1000 kHz for US), Vrf =74 dBµV,

mod = 30%, faudio =400 Hz, unless otherwise specified.

Image rejection

Logarithmic field strength

indicator

@40 dBµV

read “FM_Smeter_log”

-0.33

(equiv.

to 37

dBµV)

-0.3

-0.27

(equiv.

to 43

dBµV)

Signal levels referred to combiner output.

Table 17.

FM overall system performance (continued)

Parameter

Test condition

Min

Typ

Max

Units

Table 18.

AM MW overall system performance

Parameter

Test condition

Min

Typ

Max

Units

Tuning range MW Eu/Jp

(can be modified by the user)

531

1629

kHz

Tuning step MW Eu/Jp

(can be modified by the user)

kHz

Tuning range MW US

(can be modified by the user)

530

1710

kHz

Tuning step MW US

(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

-10dB drop point

Distortion

m = 80 %

0.1

Adjacent channel selectivity

F=9 kHz, SINAD = 26 dB

undesired. m=30%, 1 kHz

-42

Alternate channel selectivity

F=18 kHz, SINAD=26 dB

undesired. m=30%, 1kHz

-50

PCB

UNDER

TEST

Vrf + 6dB

Vrf

15pF

68pF

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