AK1544 Datasheet, PDF (1/37 Pages) Asahi Kasei Microsystems – 1300MHz Integer-N Frequency Synthesizer

[AK1544]
AK1544
1300MHz Integer-N Frequency Synthesizer
1. Overview
Consisting a highly accurate charge pump that supports current adjustment in 9 steps, a reference divider, a
programmable divider and a dual-modulus prescaler (P/P+1), the AK1544 provides high performance, low consumption
current and small footprint for a wide range of frequency conversions. This synthesizer also has two general-purpose
output pins which allow it to be used to control the RF front end.
An ideal Phase Locked Loop (PLL) can be achieved by combining the AK1544 with the external loop filter and VCO
(Voltage Controlled Oscillator). Access to the registers is controlled via a 3-wire serial interface. The operating supply
voltage is from 2.7V to 5.5V; and the supply voltage for the charge pump and that for the serial interface can be driven
separately.
2. Features
 Operating frequency:
400 to 1300MHz
 Programmable charge pump current:
160 to 2530A typical
The charge pump current can be changed in 9 steps, and the
current range can be adjusted by the external resistance.
Two current settings can be specified with the register and switched
over from one to another using the timer.
 Supply Voltage:
2.7 to 5.5 V (PVDD pin)
 Separate power supply for the charge pump: PVDD to 5.5V (CPVDD pin)
 On-chip power-saving features
 On-chip lock detection feature of PLL:
Direct output to the PFD (Phase frequency detector)
or digital filtering output can be selected.
 General-purpose output:
It has two general-purpose output ports to control peripheral
parts.
 Very low consumption current:
2.8mA typical
 Package:
24pin QFN (0.5mm pitch, 4mm4mm0.7mm)
 Operating temperature:
-40°C to 85°C
MS1350-E-01
1
2013/03