ISG4042EU-T

The ISG4042EU-T has the following features including TWO WAY EURO DOCSIS BASED DESIGN:112-858 MHz Downstream,5-65 MHz Upstream;SINGLE SUPPLY 5 V OPERATION:With Built-in Linear Regulation;SINGLE AGC CONTROL Simplifies Modem Calibration.

The ISG4042EU-T is an RF tuner/transmitter designed for use in EURO DOCSIS cable modem applications. It is a complete solution that interfaces directly with QAM Mod/Demod IC's. The tuner/transmitter integrates a diplex filter, dual conversion receiver, transmit AGC amplifier, and other RF filtering (see Figure 1). The diplex filter provides over 40 dB of isolation between the Tx band and the Rx band. The receiver channel selects and converts QAM signals in the Rx band down to the IF sampling frequency. It also provides the necessary gain control to adjust the input power to the DSP chip. The RF transmitter section provides56 dB of digitally controlled range while maintaining excellent linearity performance.Each of these modes is characterized by activation of a distinct output stage. In HP mode, the output stage exhibits 15 dB higher gain than LN mode. The lower gain of the LN output stage allows for significantly lower output noise and lower transmit-disable transients.

Performance tests and ratings for Sirenza Microdevices' products were performed internally by Sirenza and measured using specific computer systems and/or components and reflect the approximate performance of the products as measured by those tests. Any difference in circuit implementation, test software, or test equipment may affect actual performance. The information provided herein is believed to be reliable at press time and Sirenza Microdevices assumes no responsibilityforthe use ofthis information. All such use shall be entirely at the user's own risk. Prices and specificationsfor Sirenza Microdevices' products are su bject to change without notice. B uyers should consult Sirenza Microdevices' standard terms and conditions of sale for S irenza's l united wa +anty with regard to its products. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. Sirenza Microdevices does notauthorize orwa+ant any productfor use in life-support devices and/or systems.