[AK1548]
AK1548
8GHz Low Noise Integer-N Frequency Synthesizer
1. Overview
The AK1548 is an Integer-N PLL (Phase Locked Loop) frequency synthesizer, covering a wide range of frequency
from 1GHz to 8GHz. Consisting of a highly accurate charge pump, a reference divider, a programmable divider
and a dual-modulus prescaler (P/P+1), this product provides high performance, very low Phase Noise and small
footprints.
An ideal PLL can be achieved by combining the AK1548 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 3.3V, and the charge pump circuit and the serial interface can be driven by individual supply voltage.
2. Features
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Operating frequency :
1GHz to 8GHz
Programmable charge pump current :
650μA to 5200μA typical with 8steps
The current range can be controlled by an external resistor.
The programmable timer can switch two charge pump
current setting.
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Fast lock mode for improved lock time :
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Supply Voltage :
2.7 to 3.3 V (PVDD, AVDD pins)
PVDD to 5.5V (CPVDD pin)
Separate Charge Pump Power Supply :
Excellent Phase Noise :
-226dBc/Hz
On-chip lock detection feature of PLL :
Selectable Phase Frequency Detector (PFD) Output or
Digital filtered lock detect
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Package :
20pin QFN (0.5mm pitch, 4mm × 4mm × 0.75mm)
-40°C to 85°C
Operating temperature :
MS1364-E-00
1
2012/1
AKM [ ASAHI KASEI MICROSYSTEMS ]
