TDA7705 datasheet(29/42 Pages) STMICROELECTRONICS

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TDA7705

Electrical specifications

Doc ID 15938 Rev 9

29/42

3.5.5

WX overall system performance

Antenna level equivalence: 0 dBµV = 1 µVrms (Antenna terminal voltage with 50 source).

Figure 14.

WX input set-up

Input level referred to signal generator loaded with 50

 (V

rf, node 'A'); no antenna dummy;

AM input not connected. Frf =162.475 MHz, Vrf = 60 dBµV, mono modulation, fdev = 3 kHz,

faudio =400 Hz. De-emphasis = 75 µs. Application: WX using mixer input 2, in conjunction

with FM narrow-band. Unless otherwise specified.

Table 21.

WX overall system performance

Parameter

Test condition

Min

Typ

Max

Units

Sensitivity

S/N = 26 dB

-7

dBµV

Ultimate S/N

@ 60 dBµV

Distortion

Deviation= 4.5 kHz

0.8

Max deviation

THD = 3 %

> 5 kHz

kHz

Adjacent channel Selectivity

F= 25 kHz, SINAD = 30 dB

desired 40 dBµV,

dev =2.0 kHz, 400 Hz

undesired. dev= 3 kHz, 1 kHz

-70

Alternate Channel Selectivity

F=50kHz, SINAD=30dB

desired 40 dBµV,

dev=2.0kHz, 400Hz

undesired. dev=2.0kHz, 1kHz

-70

Vrf + 6dB

PCB

UNDER

TEST

Vrf + 6dB

Vrf

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