TDA5630BT datasheet(8/24 Pages) PHILIPS

8 / 24 page

1996 Jun 06

Philips Semiconductors

Product speciﬁcation

9 V VHF and UHF mixer/oscillator for TV

and VCR cable tuners

TDA5630BT

Fig.3 Gain measurement in band A.

Zin (AIN) >> 50 Ω V i =2 × Vmeas.

Vi =Vmeas + 6 dB.

Vo =V’meas + 15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).

Gv =20log

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handbook, full pagewidth

MGD264

signal

source

D.U.T.

AIN

GND

out

Ω

2 x 5

turns

meas

RMS

voltmeter

spectrum

analyzer

N1/N2 = 5

Fig.4 Input circuit for optimum noise figure in band A.

(a) For fRF = 50 MHz:

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

image suppression = 16 dB

C1 = 9 pF

C2 =15pF

L1 = 7 turns (diameter = 5.5 mm, wire diameter = 0.5 mm)

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

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

Ω; 96 pF/m).

(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): 5 cm long

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

Ω; 96 pF/m).

handbook, full pagewidth

MBE286 - 1

PCB

plug

BNC

RIM-RIM

PCB

RIM-RIM

(a)

(b)

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