MC13190FC View Datasheet(PDF) - Motorola => Freescale
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MC13190FC Datasheet PDF : 15 Pages
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Application Information Freescale Semiconductor, Inc.
4 Application Information
Figure 3 shows the basic transceiver evaluation board circuit schematic with reference oscillator and
Figure 4 shows the optional external LNAs. Figures 5 and 6 show the evaluation board printed circuit
board layout details.
This realization is intended for device evaluation and has been designed with a 50 Ω interface. C19, C20,
L10 and L12 form a lumped-element balun. In equipment applications a differential antenna can be
interfaced through matching elements directly to the LNA and Modulator contacts. A PCB dipole antenna
board with balun and SMA connector is available for link evaluations. A version of the board which
includes a dipole antenna is also available. The RF circuit layout is critical and should be duplicated
exactly. In normal applications, the entire transceiver should be shielded and control lines from the
baseband should be as short as possible.
The optional external LNA circuits require an external differential switch that is implemented with PIN
diodes D1, D2, D3 and D4. T1 and T2 are quarter wave lines for isolation. IC Contact 15, LNA_SW, is
grounded since the internal switch is not used. If the LNA are used, C25 and C30 are not placed and “zero
Ohm” resistors R5, R9, R13 and R14 insert the LNAs into the receive path.
Voltage supply Contacts 1, 2, 3, 12, 19, 23 and 24 require bypass capacitors as close as possible to the
device. Logic supply Contact 4 can directly interface to the baseband supply in equipment applications.
The DEMOD_BYPASS (Contact 22) bypasses the demodulator bias circuitry for both RF signals and low
frequency signals. The differential demodulator output from contacts 20 and 21 is available at TP1 and
TP2. The PLL loop filter is the standard R+C // C network and connects between contacts 12 and 13.
8
MC13190 Advance Information
MOTOROLA
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