PDF ML145106 Data sheet ( Hoja de datos )

Número de pieza	ML145106
Descripción	PLL Frequency Synthesizer CMOS
Fabricantes	LANSDALE Semiconductor
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No Preview Available ! www.DataSheet4U.com ML145106 PLL Frequency Synthesizer CMOS INTERFACES WITH DUAL–MODULUS PRESCALERS Legacy Device: Motorola MC145106 The ML145106 is a phase–locked loop (PLL) frequency synthesizer constructed in CMOS on a single monolithic structure. This synthesizer finds applications in such areas as AM radio, shortwave, amateur radio, CB and FM transceivers. The device contains an oscillator/amplifier, a 210 or 211 divider chain for the oscillator signal, a programmable divider chain for the input signal, and a phase detector. The ML145106 has circuitry for a 10.24 MHz oscillator or may operate with an exter- nal signal. The circuit provides a 5.12 MHz output signal, which can be used for frequency tripling. A 29 programmable divider divides the input signal frequency for channel selection. The inputs to the program- mable divider are standard ground–to–supply binary signals. Pull–down resistors on these inputs normally set these inputs to ground enabling these programmable inputs to be controlled from a mechanical switch or electronic circuitry. The phase detector may control a VCO and yields a high level signal when input frequency is low, and a low level signal when input fre- quency is high. An out–of–lock signal is provided from the on–chip lock detector with a “0” level for the out–of–lock condition. • Single Power Supply • Wide Supply Range: 4.5 to 12 V • Provision for 10.24 MHz Crystal Oscillator • 5.12 MHz Output • Programmable Division Binary Input Selects up to 29 • On–Chip Pull–Down Resistors on Programmable Divider Inputs • Selectable Reference Divider, 210 or 211 (Including ÷ 2) • Three–State Phase Detector • See Application Note AN535 and Article Reprint AR254 • Chip Complexity: 880 FETs or 220 Equivalent Gates 18 1 P DIP 18 = VP PLASTIC DIP CASE 707 20 1 SOG 20W = -6P SOG PACKAGE CASE 751D CROSS REFERENCE/ORDERING INFORMATION PACKAGE MOTOROLA LANSDALE P DIP 18 SOG 20W MC145106P ML145106VP MC145106DW ML145106-6P Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. OSCout OSCin fin Page 1 of 8 BLOCK DIAGRAM ÷ 2out ÷2 FS REFERENCE DIVIDE 29 OR 210 DIVIDE–BY–N COUNTER 29 – 1 PHASE DETECTOR φDetout LD P0 P1 P2 P3 P4 P5 P6 P7 P8 www.lansdale.com Issue bCB 1 page ML145106 www.DataSheet4U.com LANSDALE Semiconductor, Inc. Legacy Applications Information PLL SYNTHESIZER APPLICATIONS The ML145106 is well suited for applications in CB radios because of the channelized frequency requirements. A typical 40 channel CB transceiver synthesizer, using a single crystal reference, is shown in Figure 3 for receiver IF values of 10.695 MHz and 455 kHz. In addition to applications in CB radios, the MC145106 can be used as a synthesizer for several other systems. Various fre- quency spectrums can be achieved through the use of proper offset, prescaling, and loop programming techniques. In gener- al, 300 – 400 channels can be synthesized using a single loop, with many additional channels available when multiple loop approaches are employed. Figures 4 and 5 are examples of some possibilities. In the aircraft synthesizer of Figure 5, the VHF loop (top) will provide a 50 kHz, 360 channel system with 10.7 MHz R/T offset when only the 11.0500 MHz (transmit) and 12.1200 MHz (receive) frequencies are provided to mixer #1. When these signals are provided with crystal oscillators, the result is a three crystal 360 channel, 50 kHz step synthesizer. When using the offset loop (bottom) in Figure 5 to provide the indi- cated injection frequencies for mixer #1 (two for transmit and two for receive) 360 additional channels are possible. This results in a 720–channel, 25 kHz step synthesizer which requires only two crystals and provides R/T offset capability. The receive offset value is determined by the 11.31 MHz crys- tal frequency and is 10.7 MHz for the example. The VHF marine synthesizer in Figure 4 depicts a single loop approach for FM transceivers. The VCO operates on fre- quency during transmit and is offset downward during receive. The offset corresponds to the receive IF (10.7 MHz) for chan- nels having identical receive/transmit frequencies (simplex), and is (10.7 – 4.6 = 6.1) MHz for duplex channels. Carrier modulation is introduced in the loop during transmit. 10.24 MHz 29/210 OSC 2 ML145106 5.0 kHz PROGRAMMABLE DIVIDER PHASE DETECTOR LD LOOP FILTER 26.965 – 27.405 MHz VCO BUFFER (TRANSMIT) 26.510 – 26.950 MHz (RECEIVE) SWITCH WAFERS VDD GND R/T BUFFER MIXER 1.365 – 1.805 MHz (TRANSMIT) 10.24 MHz 16.270 – 16.710 MHz 0.91 – 1.35 MHz (RECEIVE) TO RECEIVER RECEIVER 1ST 2ND MIXER LOCAL OSC SIGNAL 25.6 MHz X 5 MIXER Figure 3. Single Crystal CB Synthesizer Featuring On–Frequency VCO During Transmit Page 5 of 8 www.lansdale.com Issue b 5 Page

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