MC13143

7

MOTOROLA RF/IF DEVICE DATA

Figure 10. Circuit Side Component Placement View

Mx Lin

Cont

Mixer In

Rev A

VCC

LO

Input

100 p

100 n

100 p

100 n

Gnd

Toko

926A10

Dielectric

Filter

16:1

Impedance

Transformer

MC13143D

51

IF

Out

NOTES: 926.5 MHz preselect dielectric filter is Toko part # 4DFA–926A10; the 4DFA (2 and 3 pole SMD type) filters are available

for applications in cellular and GSM, GPS, DECT, PHS, PCS and ISM bands at 902–928 MHz, 1.8–1.9 GHz at 2.4–2.5 GHz.

The PCB also accommodates a surface mount RF SAW filter in an eight or six pin ceramic package for the cellular base and

handset frequencies. Recommended manufacturers are Siemens and Murata.

The PCB may also be used without a preselector filter; AC coupled to the mixer as shown in the test circuit schematic.

All other external circuit components shown in the PCB layout above are the same as used in the test circuit schematic.

16:1 broadband impedance transformer is mini circuits part #TX16–R3T; it is in the leadless surface mount “TX” package. For a

more selective narrowband match, a lowpass filter may be used after the transformer. The PCB is designed to accommodate

lump inductors and capacitors in more selective narrowband matching of the mixer differential outputs to a single–ended output

at a given IF frequency.

.

The local oscillator may also be driven in a differential configuration using a coaxial transformer. Recommended sources are the

Toko Balun transformers type B4F, B5FL and B5F (SMD component).

MC13143D

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005