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Issue A

ML145159

Serial-Input PLL Frequency

Synthesizer with Analog Phase

Detector

Legacy Device: Motorola MC145159-1

The ML145159 has a programmable 14–bit reference

counter, as well as fully programmable

divide–by–N/divide–by–A counters. The counters are pro-

grammed serially through a common data input and

latched into the appropriate counter latch, according to the

last data bit (control bit) entered.

When combined with a loop filter and VCO, this device can

provide all the remaining functions for a PLL frequency syn-

thesizer operating up to the device's frequency limit. For high-

er VCO frequency operations, a down mixer or a dual–modu-

lus prescaler can be used between the VCO and the PLL.

• Operating Temperature Range: TA – 40° to 85°C

• Low Power Consumption Through Use of CMOS

Technology

• 3.0 to 9.0 V Supply Range

• On– or Off–Chip Reference Oscillator Operation

• Compatible with the Serial Peripheral Interface (SPI)

on CMOS MCUs

• ÷ R Range = 3 to 16383

• ÷ N Range = 16 to 1023, P A Range = 0 to 127

• High–Gain Analog Phase Detector

• See Application Note AN969

Note: Lansdale lead free (Pb) product, as it

becomes available, will be identified by a part

number prefix change from ML to MLE.

INTERFACES WITH DUAL–MODULUS PRESCALERS