AddiTIonal InformaTIon:
- Wireless Product Line Page
- MAX2680/MAX2681/MAX2682
- The MAX2140 Complete SDARS Receiver
- The MAX2472/MAX2473 500MHz to 2500MHz VCO Buffer Amplifiers
- Applications Technical Support
The MAX2682 downconverter operates from a single +2.7V to +5.5V supply, ideal for hand held applications. Each downconverter features a low-power shutdown mode in which it typically draws less than 0.1µA of supply current.
The MAX2682 downconverter is manufactured on a high-frequency, low-noise, advanced silicon-germanium process and is offered in the space-saving 6-pin SOT23 package.

Figure 1. Typical operating circuit (the values of matching components C2, L1, R1, Z1, Z2, and Z3 depend on the IF and RF frequency and downconverter).
The MAX2682 mixer has been retuned for the following parameters:
1. RF = 2642.5MHz
2. IF = 402.5MHz
3. LO frequency = 3045MHz
4. BW (bandwidth) = 25MHz
5. Vcc = 3.3V
Figure 2 shows the matching networks used to make all measurements in this report.

Figure 2. Matching network for 2642.5MHz satellite radio. Measured Performance

Figure 3. LO port return loss.

Figure 4. RF port return loss.

Figure 5. IF port return loss.

Figure 6. Return loss measurement set up.
Figure 7 shows very flat gain, down only 0.2dB at 12.5MHz band edge.

Figure 7. Gain flatness.
IsolationLO – IF = 10.67dB
LO – RF = 16.67dB
Below is the raw data taken for the isolation measurement.
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MAX2116和MAX2118的散热设计
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