AK1542A_17 Datasheet, PDF (1/38 Pages) Asahi Kasei Microsystems – 20 to 600MHz Integer-N Frequency Synthesizer

[AK1542A]
AK1542A
20 to 600MHz 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 AK1542A 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 AK1542A 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
2.7 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:
20 to 600MHz
 Programmable charge pump current:
158 to 2528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:
2.2mA typical
 Package:
24pin QFN (0.5mm pitch, 4mm4mm0.75mm)
 Operating temperature:
-40C to 85C
MS1399-E-02
-1-
2014/4