AN1745| Application Note
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Maxim/Dallas > Designer's Library > App Notes > WIRELESS, RF, AND CABLE Keywords: rf, rfic, cable ics, cable modem, power amplifiers, PAs, rf ics, integrated circuits Related Parts
APP 1745: Sep 25, 2002
Download, PDF Format (112kB)
Author: Scott Anderson
APPLICATION NOTE 1745
PUBLIC VIEW | ADMIN | en: PUBLIC
The MAX3510/MAX3514/MAX3516 Cable Upstream Amplifiers ACPR (Adjacent Channel Power Ratio) Performance
Provides performance data for MAX3510/MAX3514/MAX3516 cable upstream driver amplifiers. ACPR and gain data are provided in graphical and tabular form. Units meet DOCSIS 2.0 standards with margin. Data is taken from 5MHz to 65MHz. Additional Information
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Wireless Product Line Page Quick View Data Sheet for the MAX3510 Quick View Data Sheet for the MAX3514, MAX3516 Applications Technical Support
The MAX3510/MAX3514/MAX3516 were tested for adjacent channel power ratio (ACPR). The test conditions were 5.0V supply and an input of +34dBmV. A set of plots was made to show the test results. The following data meets DOCSIS 2.0 with margin. ACPR is an important parameter in cable amplifiers because a transmitted carrier may occur in an adjacent channel that could be occupied by a carrier of the same or different modulation rate. ACPR is defined as channel power ratio between the primary channel and adjacent channel. According to DOCSIS a 160kHz measurement bandwidth is used with 200kHz channel spacing. The MAX3510/MAX3514/MAX3516 are a family of programmable-gain upstream amplifiers designed for use in CATV upstream applications. They operate over a frequency range of 5MHz to 65MHz and drives up to +64dBmV QPSK (MAX3516). Since both input and output ports are differential, an external balun at the output port is required. The variable gain feature provides greater than 56dB of dynamic range (MAX3514/MAX3516
) and is controlled by a SPI 3wire interface. Gain control is available in 0.5dB steps (MAX3514/MAX3516) or 1dB step (MAX3510).
Test Conditions
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All tests at room temperature. VCC = 5.0V - PIN = -13dBm (+34dBmV in 50
system) = 0.25
Input signal: QPSK modulation with 20bit PRBS, root cosine filter, High power mode Input ACPR -66dBc 200kHz channel spacing 160kHz measurement bandwidth
Corrections and Unit Conversion
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In 50 In 75 loss
system, PIN/OUT (dBmV) = PIN/OUT (dBm) + 47dB system, PIN/OUT (dBmV) = PIN/OUT (dBm) + 49dB
The MAX3510EVKit board has 3.5dB loss at the output, so POUT (dBmV) = POUT (dBm) + 47dB + 3.5dB + cable
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