ml4044 Lansdale Semiconductor, Inc., ml4044 Datasheet
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ml4044
Manufacturer Part Number
ml4044
Description
Phase Frequency Detector
Manufacturer
Lansdale Semiconductor, Inc.
Datasheet
1.ML4044.pdf
(5 pages)
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
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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 ...