The highly-integrated ZD1051 56K USB modem chip uses only one DSP core, embedded in the ZD1051, to handle both the signal and protocol processing. No controller is needed for modem protocol handling. This kind of integration not only shrinks the modem chipset into a single chip but also improves hardware reliability and reduces the power consumption. An extremely small 128-pin TQFP package, 16x16 mm square, is easily fitted to any critical PCB design. The power dissipation of ZD1051 is less than 220 mW, ZD1051 is suitable for power-sensitive portable applications.
This solution also adopts the latest silicon DAA technology with programmable characteristics; this makes it possible to meet the world wide PTT certifications using a single hardware.
ZyDAS USB modem solution is the best choice for designing a 56K USB external modem.