ml4044 Lansdale Semiconductor, Inc., ml4044 Datasheet

ml4044

Manufacturer Part Number

ml4044

Description

Phase Frequency Detector

Manufacturer

Lansdale Semiconductor, Inc.

Datasheet

1.ML4044.pdf (5 pages)

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pump circuit which converts MTTL inputs to a dc voltage level

for use in frequency discrimination and phase–locked–loop

applications.

cy detector 1 is locked in (indicated by both outputs high) when

the negative transitions of the variable input (V1) and reference

input (R1) are equal in frequency and phase. If the variable input

is lower in frequency or lags in phase, the U1 (up) output goes

low; conversely the D1 (down) output goes low when the vari-

able input is higher in frequency or leads the reference input in

phase. It is important to note that the duty cycles of the variable

input and the reference input are not important since negative

transitions control system operation.

able input phase lags the reference phase th 90º (indicated by the

U2 and D2 outputs alternately going low with equal pulse

widths). If the variable input phase lags by more than 90º, U2

will remain low longer than D2, and conversely, if the variable

input phase lags the reference phase by less than 90º, D2

remains low longer. In this phase detector the variable input and

the reference must have 50% duty cycles.

applied to PU, and D1 or D2 applied to PD) and converts them

to fixed amplitude positive and negative pulses at the UF and DT

outputs respectively. These pulses are applied to a lag-lead active

filter, which incorporates external components, as well as the

amplifier provided in the MC4344/4044 circuit. The filter pro-

vides a dc voltage proportional to the phase error.

Page 1 of 5

This device contains two digital phase detectors and a charge

The two phase detectors have common inputs. Phase–frequen-

Phase detector 2, on the other hand, is locked in when the vari-

The charge pump accepts the phase detector outputs (U1 or U2

www.lansdale.com

ML4344_4044

Phase Frequency Detector

Issue 0

Related parts for ml4044

ml4044 Summary of contents

Page 1

This device contains two digital phase detectors and a charge pump circuit which converts MTTL inputs voltage level for use in frequency discrimination and phase–locked–loop applications. The two phase detectors have common inputs. Phase–frequen- cy detector 1 ...

Page 2

ML4344/4044 Page www.lansdale.com ...

Page 3

ML4344/4044 Page www.lansdale.com ...

Page 4

ML4344/4044 Page www.lansdale.com ...

Page 5

... Lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc. Page www ...

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