TDA5745 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA5745

Low power mixers/oscillators for hyperband tuners

Philips Electronics 

Philips Semiconductors

Low power mixers/oscillators for

hyperband tuners

Preliminary specification

TDA5744; TDA5745

handbook, full pagewidth

BNC C1

L1

I1

PCB

plug

C2

RIM-RIM

(a)

I3

PCB

BNC C3

I2

plug

RIM-RIM

C4

(b)

MBE286 - 1

(a) For fRF = 50 MHz:

VHF mixer frequency response measured = 57 MHz;

loss = 0 dB.

Image suppression = 16 dB.

C1 = 1 nF; C2 = 2.2 pF.

L1 = 7 turns (∅ 5.5 mm; wire ∅ = 0.5 mm).

I1 = 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:

VHF mixer frequency response measured = 150.3 MHz;

loss = 1.3 dB.

Image suppression = 13 dB.

C3 = 1 nF; C4 = 2.2 pF.

I2 = semi rigid cable (RIM): 30 cm long.

I3 = semi rigid cable (RIM): 5 cm long.

(semi rigid cable (RIM); 33 dB/100 m; 50 Ω; 96 pF/m).

Fig.8 Input circuit for optimum noise figure in the VHF band.

handbook, full pagewidth

NOISE

SOURCE

BNC

RIM

INPUT

CIRCUIT

VHFIN IFOUT1

D.U.T.

IFOUT2

T

C

NOISE

FIGURE

METER

MGL277

F = Fmeas − loss (of input circuit) (dB).

Fig.9 Noise figure (F) measurement in the VHF band.

1998 Mar 09

11

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