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3D7215Z-8 Datasheet(PDF) 2 Page - Data Delay Devices, Inc. |
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3D7215Z-8 Datasheet(HTML) 2 Page - Data Delay Devices, Inc. |
2 / 4 page 3D7215 APPLICATION NOTES 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 Recommended Maximum Frequency, the 3D7215 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. OPERATIONAL DESCRIPTION The 3D7215 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 Recommended Maximum and an Absolute Maximum operating input frequency and a Recommended Minimum and an Absolute Minimum operating pulse width have been specified. OPERATING PULSE WIDTH The Absolute Minimum 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. OPERATING FREQUENCY The Recommended Minimum 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. The Absolute Maximum 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. To guarantee the Table 1 delay accuracy for input pulse width smaller than the Recommended Minimum Pulse Width, the 3D7215 must be tested at the user operating The Recommended Maximum Frequency specification determines the highest frequency of VDD O1 IN O2 O3 O4 Temp & VDD Compensation GND Figure 1: 3D7215 Functional Diagram 25% 25% 25% 25% O5 VDD O1 IN O2 O3 O4 Temp & VDD Compensation GND 20% 20% 20% 20% 20% O5 Dash numbers < 8 Dash numbers >= 8 Doc #01015 DATA DELAY DEVICES, INC. 2 11/8/01 Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com |
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