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3D7215 Datasheet(PDF) 2 Page - Data Delay Devices, Inc.

Part No. 3D7215
Description  MONOLITHIC 5-TAP FIXED DELAY LINE (SERIES 3D7215 - LOW NOISE)
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Maker  DATADELAY [Data Delay Devices, Inc.]
Homepage  http://www.datadelay.com
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3D7215 Datasheet(HTML) 2 Page - Data Delay Devices, Inc.

   
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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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