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TRF3705
SLWS223A – AUGUST 2011 – REVISED OCTOBER 2011
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DAC to Modulator Interface Network
For optimum linearity and dynamic range, a digital-to-analog converter (DAC) can interface directly with the
TRF3705 modulator. It is imperative that the common-mode voltage of the DAC and the modulator baseband
inputs be properly maintained. With the proper interface network, the common-mode voltage of the DAC can be
translated to the proper common-mode voltage of the modulator. The TRF3705 common-mode voltage is
typically 0.25 V, and is ideally suited to interface with the DAC3482 / 3484 (DAC348x) family because the
common-mode voltages of both devices are the same; there is no translation network required. The interface
network is shown in Figure 71 .
LO
DAC348x
50 W
50 W
50 W
50 W
0/90
S
50 W
50 W
50 W
50 W
TRF3705
Figure 71. DAC348x Interface with the TRF3705 Modulator
The DAC348x requires a load resistor of 25 Ω per branch to maintain its optimum voltage swing of 1-V PP
differential with a 20-mA max current setting. The load of the DAC is separated into two parallel 50- Ω resistors
placed on the input and output side of the low-pass filter. This configuration provides the proper resistive load to
the DAC while also providing a convenient 50- Ω source and load termination for the filter.
DAC348x with TRF3705 Modulator Performance
The combination of the DAC348x driving the TRF3705 modulator yields excellent system parameters suitable for
high-performance applications. As an example, the following sections illustrate the typical modulated adjacent
channel power ratio (ACPR) for common telecom standards and bands. These measurements were taken on the
DAC348x evaluation board .
24
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