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データシートサーチシステム |
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データシートサーチシステム |
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AM7992 データシート(PDF) 7 Page - Advanced Micro Devices |
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AM7992 データシート(HTML) 7 Page - Advanced Micro Devices |
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7 / 27 page  Am7992B 7 Figure 3. TTL Clock Driver Circuit for X 1 SIA Oscillator Specification for External Crystal When using a crystal to drive the Am7992B oscillator, the following crystal specification should be used to en- sure a transmit accuracy of 0.01%: Some crystal manufacturers have generated crystals to this specification. One such manufacturer is Reeves- Hoffman. Their ordering part number for this crystal is RH#04-20423-312. Another manufacturer is Epson— Par t #MA 506-200M-50 pF, which is a surface- mounted crystal. Specification for External TTL Level When driving the oscillator from an external clock source, X 2 must be left floating (unconnected). An external clock having the following characteristics must be used to ensure less than +0.5 ns jitter at Transmit+ (see the X 1 Driven from External Source waveform diagram and the TTL Clock Driver Circuit for X 1, Figure 3): s Clock Frequency: 20 MHz ±0.01% s Rise/Fall Time (t R/tF): <4 ns, monotonic s X 1 HIGH/LOW Time (t HlGH/tLOW): > 20 ns s X 1 Falling Edge-to-Falling Edge Jitter: < ±0.2 ns at 1.5 V input Receiver Path The principle functions of the receiver are to signal the LANCE that there is information on the receive pair and to separate the incoming Manchester-encoded data stream into clock and NRZ data. The receiver section (see Figures 4 and 5) consists of two parallel paths. The receive data path is a zero threshold, wide bandwidth line receiver. The carrier path is an offset threshold bandpass-detecting line re- ceiver. Both receivers share common bias networks to allow operation over an input common mode range of 0 V to 5.5V. Limit Unit Min Nominal Max Resonant Frequency Error with C L = 50 pF –50 0 +50 PPM Change in Resonant Frequency Temperature with C L = 50 pF –40 +40 PPM Parallel Resonant Frequency with C L = 50 pF 20 MHz Motional Crystal Capacitance, C 1 0.022 pF X 1 ALS Driver or Equivalent 03378I-7 Manchester Decoder Data Receiver Noise Reject Filter Carrier Detect RX RCLK RENA DI ± 03378I-8 Figure 4. Receiver |
同様の部品番号 - AM7992 |
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同様の説明 - AM7992 |
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