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Appendix C LW400-09A Digital Output Option Introduction The LW400-09A Digital Output option provides 8-bit TTL and ECL, digital outputs corresponding to the current value of the channel 1 analog output. The latched digital data, which is held for the duration of the sample clock, is available via two rear panel mounted connectors. Digital data is available whenever the channel 1 output is enabled. LW400's, with the digital output option, include a special digital editing mode for the creation of user specified data patterns. Byte wide data patterns or selected bits within the 8-bit wide digital word may be programmed. Digital data patterns created using this editor are identified as "Digital" waveforms. Digital waveforms can be edited using the same "cut and paste" tools available for analog waveforms. The major difference between the two waveform types is that digital waveforms are not processed to remove discontinuities at transitions. This also means that Time editing functions, such as sub-sample Move, are not useable with digital waveforms and are limited to analog waveforms only. Specifications Digital outputs: 8 bits corresponding to the channel 1 analog output plus CLOCK and CLOCK* (TTL only). Digital output modes: ECL, TTL all available on output connectors simultaneously. Mating output connector: SMB for ECL output 20 pin P/N 3M-3421-7020 for TTL output. Maximum data output clock rate: ECL, 400 MBytes/sec; TTL 100 MBytes/sec. C-1 Appendix C ECL outputs: Levels: Parameter Min Typ Max VOH -0.98 V -0.8 V -0.71V VOL -1.95 V -1.8 V -1.58 V Note: output load is 50 to -2 Volts. Timing: Parameter Min Typ Max Clock to 7 ns 8 ns 9.8 ns Analog Output Setup Time * T-660 ps T-485 ps T-310 ps Hold Time 310 ps 485 ps 660 ps Data skew - 80 ps 250 ps * T is clock period (i.e. 2.5 ns for 400 MHz clock) TTL : Levels: Parameter Min Typ Max VOH 2.00 V 2.60 V - VOL - 0