TDC-GP21 datasheet(55/91 Pages) AMSCO

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Ultrasonic-Flow-Converter

TDC-GP21

4-10

acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de

and is done automatically with the right configuration. During calibration the TDC

measures one and two periods of the 4 MHz reference clock.

The calibrated result does not depend on temperature or supply voltage.

The measurement range is limited by size of the coarse counter:

tyy = Tref x 214 = 4.1ms @ 4MHz

The time interval between START and STOP is calculated with a 26 bit measurement

range.

Time (Condition)

Description

tph

2,5 ns (min.)

Minimum pulse width

tpl

2,5 ns (min.)

Minimum pulse width

tss

2*Tref

Start to Stop @

DIS_PHASESHIFT = 1

trr

2*Tref

Rising edge to rising edge

tff

2*Tref

Falling edge to falling edge

tva

4.6 µs (max.)

ALU start to data valid

tyy

4 ms (max)

Max. measurement range

Input circuitry

Each input separately can be set to be sensitive to rising or falling edg e. This is done in

Further all Start/Stop-inputs support a high active enable pin.

Note:

In case the Start-Stop interval is less than the lower limit tzz the TDC will ignore more and

more events the smaller it is. In no case there will be wrong results.

Figure 4.7

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