3D7215Z-8 datasheet(2/4 Pages) DATADELAY

Part #	3D7215Z-8

Description	MONOLITHIC 5-TAP FIXED DELAY LINE (SERIES 3D7215 - LOW NOISE)

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Manufacturer	DATADELAY [Data Delay Devices, Inc.]

Direct Link	http://www.datadelay.com

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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%

O5

VDD

O1

IN

O2

O3

O4

Temp & VDD

Compensation

GND

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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