TDA6502 datasheet(24/44 Pages) PHILIPS

24 / 44 page

2000 Mar 16

Philips Semiconductors

Preliminary speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6502; TDA6502A;

TDA6503; TDA6503A

13 TEST AND APPLICATION INFORMATION

13.1

Test circuits

handbook, full pagewidth

FCE577

Ω

VHFIN

IFOUT

Vmeas

RMS

voltmeter

spectrum

analyzer

D.U.T.

V'meas

signal

source

Fig.12 Gain measurement in VHF band.

Zi >> 50 Ω⇒ Vi =2 × Vmeas =80dBµV

Vi =Vmeas +6dB =80dBµV

Vo =V’meas ×

Gv = 20 log

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handbook, full pagewidth

FCE578

PCB

plug

BNC

RIM-RIM

PCB

RIM-RIM

(a)

(b)

Fig.13 Input circuit for optimum noise figure in VHF band.

(b) For fRF = 150 MHz:

mixer A frequency response measured = 150.3 MHz, loss = 1.3 dB

image suppression = 13 dB

C3 = 5 pF

C4 =25pF

l2 = semi rigid cable (RIM): 30 cm long

l3 = semi rigid cable (RIM) of 5 cm long

(semi rigid cable (RIM); 33 dB/100 m; 50

Ω; 96 pF/m).

(a) For fRF = 50 MHz:

mixer A frequency response measured = 57 MHz, loss = 0 dB

image suppression = 16 dB

C1 = 9 pF

C2 = 15 pF

L1 = 7 turns (

∅ 5.5 mm, wire ∅ = 0.5 mm)

l1 = semi rigid cable (RIM) of 5 cm long

(semi rigid cable (RIM); 33 dB/100 m; 50

Ω; 96 pF/m).

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