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3D7225K-4 Datasheet(PDF) 2 Page - Data Delay Devices, Inc. |
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3D7225K-4 Datasheet(HTML) 2 Page - Data Delay Devices, Inc. |
2 / 4 page 3D7225 APPLICATION NOTES OPERATIONAL DESCRIPTION The 3D7225 five-tap delay line architecture is shown in Figure 1. The delay line is composed of a number of delay cells connected in series. Each delay cell produces at its output a replica of the signal present at its input, shifted in time. The delay cells are matched and share the same compensation signals, which minimizes tap-to- tap delay deviations over temperature and supply voltage variations. INPUT SIGNAL CHARACTERISTICS The Frequency and/or Pulse Width (high or low) of operation may adversely impact the specified delay accuracy of the particular device. The reasons for the dependency of the output delay accuracy on the input signal characteristics are varied and complex. Therefore a Maximum and an Absolute Maximum operating input frequency and a Minimum and an Absolute Minimum operating pulse width have been specified. OPERATING FREQUENCY The Absolute Maximum Operating Frequency specification, tabulated in Table 1, determines the highest frequency of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable duty cycle distortion. The Maximum Operating Frequency specification determines the highest frequency of the delay line input signal for which the output delay accuracy is guaranteed. To guarantee the Table 1 delay accuracy for input frequencies higher than the Maximum Operating Frequency, the 3D7225 must be tested at the user operating frequency. Therefore, to facilitate production and device identification, the part number will include a custom reference designator identifying the intended frequency of operation. The programmed delay accuracy of the device is guaranteed, therefore, only at the user specified input frequency. Small input frequency variation about the selected frequency will only marginally impact the programmed delay accuracy, if at all. Nevertheless, it is strongly recommended that the engineering staff at DATA DELAY DEVICES be consulted. OPERATING PULSE WIDTH The Absolute Minimum Operating Pulse Width (high or low) specification, tabulated in Table 1, determines the smallest Pulse Width of the delay line input signal that can be reproduced, shifted in time at the device output, with acceptable pulse width distortion. The Minimum Operating Pulse Width (high or low) specification determines the smallest Pulse Width of the delay line input signal for which the output delay accuracy tabulated in Table 1 is guaranteed. To guarantee the Table 1 delay accuracy for input pulse width smaller than the Minimum Operating Pulse Width, the 3D7225 must be tested at the user operating pulse width. Therefore, to facilitate production and device identification, the part number will include a VDD O1 IN O2 O3 O4 Temp & VDD Compensation GND Figure 1: 3D7225 Functional Diagram 20% 20% 20% 20% 20% O5 Doc #05002 DATA DELAY DEVICES, INC. 2 4/15/05 Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com |
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