MB15U36 Datasheet, PDF(20/23 Page) Fujitsu Component Limited. – Dual PLL Frequency Synthesizer with On-Chip Prescaler

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MB15U36 Datasheet, PDF (20/23 Pages) Fujitsu Component Limited. – Dual PLL Frequency Synthesizer with On-Chip Prescaler

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Application Example: Fastlock Mode

OUTPUT

LPF

VCO

TCXO

1000 pF

MB15U36

.1 ÂµF

From Controller

LD/fOUT OSCOUT OSCIN GND1 Xfin1

fin1

GND1

Do1

Vp1

Vcc1

MB15U36

Clock Data

GND2 Xfin2

fin2

GND2

Do2

Vp2

Vcc2

1000 pF

OUTPUT

VCO

LPF

.1 ÂµF

Notes: 1) Package Type: 20-pin SSOP

2) Clock, Data, LE: Insert a pull-down or pull-up resistor as needed to prevent oscillation when the terminals are left open

3) The Fastlock mode is controlled by the LDS/FDS bits and the CMCRF1 bit. When the CMCRF1 bit is set to âHâ (the RF1 charge pump current is increased

4x normal mode), the LD/fout pin (open drain output) is âLâ, enabling the parallel resistor in the loop filter. This effectively increases the LPF bandwidth,

allowing the loop to lock faster. After the loop has locked onto a new frequency, the CMCRF1 bit is set to âLâ, forcing the LD/fout output pin into a high

impedance state and returning the LPF bandwidth back to its original value.

Fujitsu Microelectronics, Inc. 21

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