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MT8941BP Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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MT8941BP Datasheet(HTML) 1 Page - Mitel Networks Corporation |
1 / 22 page 1 Features • Provides T1 clock at 1.544 MHz locked to an 8 kHz reference clock (frame pulse) • Provides CEPT clock at 2.048 MHz and ST-BUS clock and timing signals locked to an internal or external 8 kHz reference clock • Typical inherent output jitter (unfiltered)= 0.07 UI peak-to-peak • Typical jitter attenuation at: 10 Hz=23 dB,100 Hz=43 dB, 5 to 40 kHz ≥ 64 dB • Jitter-free “FREE-RUN” mode • Uncommitted two-input NAND gate • Low power CMOS technology Applications • Synchronization and timing control for T1 and CEPT digital trunk transmission links • ST- BUS clock and frame pulse source Description The MT8941B is a dual digital phase-locked loop providing the timing and synchronization signals for the T1 or CEPT transmission links and the ST-BUS. The first PLL provides the T1 clock (1.544 MHz) synchronized to the input frame pulse at 8 kHz. The timing signals for the CEPT transmission link and the ST-BUS are provided by the second PLL locked to an internal or an external 8 kHz frame pulse signal. The MT8941B offers improved jitter performance over the MT8940. The two devices also have some functional differences, which are listed in the section on “Differences between MT8941B and MT8940”. Ordering Information MT8941BE 24 Pin Plastic DIP (600 mil) MT8941BP 28 Pin PLCC -40 °C to +85°C Figure 1 - Functional Block Diagram F0i C12i MS0 MS1 MS2 MS3 C8Kb C16i Ai Bi Yo VDD VSS RST CVb CV ENCV F0b C4b C4o ENC4o C2o C2o ENC2o 2:1 MUX Variable Clock Control Mode Selection Logic DPLL #2 Input Selector Clock Generator Frame Pulse Control 4.096 MHz Clock Control 2.048 MHz Clock Control DPLL #1 DS5186 ISSUE 1 June 1999 MT8941B Advanced T1/CEPT Digital Trunk PLL CMOS ST-BUS ™ FAMILY |
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