Block diagram of the MAX3510 upstream CATV amplifier system
Abstract: The block diagram in the article is the MAX3510 upstream CATV amplifier system. This design complies with the DOCSIS standard. The figure shows the transformer, tuner module, baseband IC, anti-spurious filter and duplexer.
The MAX3510 is a programmable power amplifier used in CATV upstream systems. This chip is the first product in the industry to comply with the DOCSIS standard. The following block diagram is a typical application system of MAX3510.
The MAX3510 can modulate carrier signals from 5MHz to 42MHz, and can provide harmonic characteristics better than -60dBc at 34dBmV output. A 2: 1 (transformer ratio) transformer can produce up to + 64dBmV (continuous wave) output. The operating frequency range is 5MHz to 65MHz. It is a variable gain amplifier controlled by a 3-wire digital serial bus. The gain control level difference is 1dB.
The MAX3510 provides a transmission inhibit mode. The chip is highly isolated between the burst modes of the TDMA system. In this mode, the output stage is turned off and the output noise is minimized. When entering or leaving the emission inhibit mode, the transient level is maintained at 7mV (typical) throughout the gain range. In addition, the power supply current is reduced to 25mA. 
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