Details, datasheet, quote on part number: MC44144
PartMC44144
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CompanyN.A.
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Features, Applications

The is a gated phase­locked loop intended for, but not restricted to, video applications. The integrated circuit contains a gated phase detector, voltage controlled crystal oscillator, divide­by­4 circuitry, and a video clamp. This device provides a 4X reference frequency output, and a 1X reference frequency output. The MC44144 is manufactured using Motorola's high density, bipolar MOSAICTM process. 8­Pin DIP or Surface Mount Package

Gated­Phase Detector Single Pin Voltage Controlled Crystal Oscillator 1X and 4X Subcarrier Output Operates Off of a Standard 5.0 V Supply

Composite Video In Clamp In Reference Subcarrier Phase Detector 3 Phase Detector Output 4X Sub Xtal 5 4X Subcarrier Output 1.0n 1 Subcarrier Output VCC 8

Burst Gate Comp Video Input 4X Subcarrier Output
Voltage 4X Ref Control Out Input VCO 4X Ref Crystal Drive to 25p Device

Rating Supply Voltage Operating Ambient Temperature Storage Temperature Range Operating Junction Temperature Symbol VCC TA Tstg TJ Value to +150 Unit Vdc °C

Characteristic Supply Voltage Composite Video Input (Note 1) Burst Amplitude to Acquire Lock Pin Symbol VCC Min 4.5 Typ 5.0 Max 5.5 Unit Vdc mVpp

NOTE: 1. Total peak­to­peak voltage of video should not exceed ground or VCC.

4X Subcarrier Output Voltage: (14.32 MHz) Output Voltage: (17.73 MHz) Output Impedance: (14.3 MHz and 17.73 MHz) Subcarrier Output Voltage: (3.58 MHz and 4.43 MHz) Output Impedance: (3.58 MHz and 4.43 MHz) Phase Angle (Note 1) Phase Sensitivity (Notes & 2) Static Phase Error (Note 2) Phase­Locked Loop Pull­In Range Phase­Locked Loop Hold­In Range

NOTES: 1. Referenced to composite video input color burst. NOTES: 2. See paragraph 1 of the Functional Description text.

4Xf sc, OUTPUT (PIN 5) FREQUENCY (MHz) FOR NTSC KOPAL

The gain must be estimated from the operating point. KOPAL is the gain for PAL applications and KONTSC is the gain for NTSC applications.

Frequency Mode Frequency Tolerance @ 25°C df/dfo ­ 70°C Load Capacitance ESR C1 (Internal Series Capacitance) 14.31818 MHz (NTSC) 17.734475 MHz (PAL) Fundamental 40 ppm 50 15 mpF

Composite Video In Clamp In Reference Subcarrier Phase Detector 1.0n 4X Subcarrier Output

The MC44144 is designed to implement the color sync function in a video system. When provided NTSC/PAL composite video or composite chroma and burst gate inputs, the IC will phase­lock a Voltage Controlled Crystal Oscillator (VCXO) to the color burst. Both 4X and 1X subcarrier frequency outputs are provided by the IC. The VCXO operates off a 4X subcarrier crystal and The VCXO operates off a 4X subcarrier crystal and is capable of at least Hz of pull­in. The tradeoff for such a wide pull­in range is a resultant "soft" lock, a 3° phase shift per 100 Hz change in oscillator free­run or input reference frequency. In addition to providing the gate pulse for the MC44144 phase detector, the Burst Gate input also initiates a clamp pulse that sets up the level of the composite video at the input to the Phase Detector. The start and duration of the Gate Pulse should be timed so that the pulse envelopes the color burst of the video signal, but not so wide as to gate sync or video into the Phase Detector. The Phase Detector is enabled when the voltage at the Burst Gate input (Pin 7) is above the nominal 2.2 V threshold. While this makes possible the ability to lock to a color burst, it does not exclude the possibility of lock to a constant reference. If a constant source to be the reference, the Phase Detector can be permanently enabled by holding the voltage on the Phase Detector input pin higher than the threshold voltage. The phase detector gain must be specified in two ways, for a constant reference and for a burst­locked application. The gain in a constant reference application is specified by the maximum current output with the maximum phase error. For a maximum phase error of /2 radians the maximum current available is approximately 200 µA. So the phase detector gain is defined as, KPD 200/(/2)(µA/rad S sec) For a burst­locked application, the Phase Detector is active for only the duration of the color burst. Therefore the phase detector gain must be specified as an average gain over a line period. In this case the phase detector gain for NTSC and for PAL applications is, KPDNTSC (8/(/2))(µA/rad S sec) and, KPDPAL (7/(/2))(µA/rad S sec) A suitable filter for both types of applications is shown in the test schematic Figure 2. This same filter also works for both NTSC and PAL applications. The 4X subcarrier Voltage Controlled Crystal Oscillator (VCXO) uses a design that enables the use of series or parallel resonant types of crystals. Still, layout and crystal positioning are critical as the oscillator frequency is sensitive to shunt capacitance. Care should be taken to keep the crystal close to the IC and crystal switching should be avoided. A suitable parallel type crystal would meet the specifications in Table 1. A plot showing the VCXO gain is shown in Figure 1. From this plot the gain must be estimated from the operating point. KOPAL is the gain for PAL applications and KONTSC is the gain for NTSC applications.


 

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