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Z02215 Datasheet(PDF) 54 Page - Zilog, Inc. |
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Z02215 Datasheet(HTML) 54 Page - Zilog, Inc. |
54 / 74 page Z02215 Single Chip Modem with Integrated Controller, Data Pump, and AFE PS001907-0904 Transmitted Data Spectrum 48 Transmitted Data Spectrum The transmitted data spectrum, with compromised equalization disabled, is shaped in the baseband of the Finite Impulse Response (FIR) filter. Table 10 reflects the spectrum characteristics. Active Hybrid Circuit and Relay Driver An active hybrid circuit is added to the Analog Front End (AFE) of the Z02215 to improve the received signal quality level by 20dB and to improve the modem per- formance. The on-chip active hybrid reduces system level costs by reducing the Table 9. Selectable Configurations Configuration Modulation1,2 Carrier Frequency Data Rate (bps) Symbol Rate (baud) Bits Per Symbol Constellation Points V.22 bis 2400 QAM 1200/2400 2400 600 4 16 V.22 bis 1200 DPSK 1200/2400 1200 600 2 4 V.22 1200 DPSK 1200/2400 1200 600 2 4 V.23 1200/75 FSK 1700/420 1200/75 1200/75 1 – V.21 FSK 1080/1750 300 300 1 – Bell 212A DPSK 1200/2400 1200 600 2 4 Bell 103 FSK 1170/2125 300 300 1 – Bell 202/ Bell 202T 1200/150 FSK 1700/437 1200/150 1200/150 1 – Notes: 1. QAM is Quadrature Amplitude Modulation FSK is Frequency Shift Key 2. Tone is Single or Dual Tone (DTMF), TM is Trellis Modulation, DPSK is Dual Phase Shift Keying Table 10. Spectral Shaping Mode Carrier Freq Spectral Power Shaping Function V.22 1200/2400 square root 75% Raised Cosine at 600 baud V.22bis 1200/2400 square root 75% Raised Cosine at 600 baud Bell 212A 1200/2400 square root 75% Raised Cosine at 600 baud Note: The carrier and the spectral shaping are selected automatically according to the Configuration. |
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