MT9042A MT9042B Differences Application Sheet ISSUE September 199

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MT9042A MT9042B Differences Application Sheet ISSUE September 199

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MSAS-72
MT9042A MT9042B Differences Application Sheet
ISSUE September 1998
This application sheet compares MT9042B functionality with that MT9042A. initial alpha trials MT9042A indicated that some enhancements were required gain wider customer acceptance product. These enhancements will help meet exceed standards, reduce hardware software overhead. MT9042B functionally equivalent version MT9042. Most systems currently using MT9042A will able accept MT9042B with little modifications their existing hardware Item Description FP8-GCI frame pulse.
software. However, systems which require MT9042A's extra wide capture range very fast lock time find MT9042B unsuitable. Noteable differences pins below. Table illustrates functional differences between devices. Some additional details provided following section, full details MT9042B functionality, refer MT9042B data sheet.
MT9042A 122ns wide positive frame pulse with falling edge aligned with center F0o. C16o. Rising edge aligned with rising edge F8o. Cycle slips occur presence jitter. Cycle slip occur. ±12,600ppm Function input phase step. maintained events. maximum always met. ±0.48ppm maximum always met. None Controls Mode changes. Function Control, LOS1 GTi.
MT9042B F16o. 61ns wide negative frame pulse with center aligned with center F0o. C16o. Falling edge aligned with rising edge F8o. cycle slips. cycle slips. ±230ppm Maximum 5ns/125µs (53ns/ 1.326ms) Maintained events. maximum always met. ±0.05ppm maximum always met. Between 30ms 60ms. Controls Mode changes corrector circuit. Function LOS1.
Reference switching. Holdover Normal Mode changes. Capture range, lock range, output frequency range. Phase change slope. Phase continuity instance reference Mode switches. MTIE with signal. Holdover Mode accuracy. MTIE with Holdover Normal Mode changes. Holdover memory.
A-15
MSAS-72
Item Description MT9042A type input. outputs logic high logic active when logic low. Phase shift realignment always shortest direction. Occur falling edge reference input. Occur falling edge reference input. function reference input master clock frequency. maximum 2.5Hz 1.9Hz Exceeds requirements over 100%. None
Application Sheet
MT9042B Schmitt type input. outputs fixed logic high when logic low. Phase shift realignment always shortest direction. Occur rising edge F8o. Occur rising edge F8o. Always aligned. Independent reference input master clock frequency. maximum 1.9Hz both Exceeds requirements about 30%. When frequency incoming signal lost outside pre-determined range, device automatically enters Holdover Mode.
TRST Manual Control Mode changes. Automatic Control Mode changes. Input output phase alignment after reset (TRST RST). Lock time Loop filter Jitter tolerance Auto-Holdover State
Table Functional Differences between MT9042A MT9042B ±Functional
Differences Details
about 30s. MT9042A worst case lock time about Capture Range (Item order keep lock time small possible maintain reduced phase change slope, capture range MT9042B reduced ±230ppm. Since large capture range MT9042A (±12,600ppm) found unnecessary applications reviewed, impact this change deemed negligible. Loop Filter (Item reduction cutoff frequency from 2.5Hz ensures that 300-011 5.4.3.2 multiple user-network specification with sufficient margin. jitter output through 40Hz 100kHz bandpass filter reduced MT9042B from about 0.12UIpp 0.10UIpp, where specification maximum 0.11UIpp.
Phase Change Slope (Item Depending reference input degradation (such complete loss signal 1ms), MT9042A phase slope could exceed AT&T TR62411 phase slope requirement 81ns/1.326ms. order guarantee phase change slope compliance with reference input degradations, limiter (53ns/ 1.326ms) MT9042B added. This reduced phase slope also provides additional time (i.e., 10ms) hardware provide loss signal indication, software initiate reference switch before Maximum Time Interval Error (MTIE) exceeded. Lock Time (Item reduction phase change slope results increase lock time. identical frequencies 180° apart, MT9042B lock time about 1.5s. frequencies range, lock time
A-16
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MT9042A MT9042B Differences Application Sheet ISSUE September 199

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