News Release

- New Product Information -

AKM releases Fractional-N PLL synthesizer with VCO. Includes the ability to replace variable capacitance diode configurations

Product Name
Product Category:
Two way Radio ICs
PLL Synthesizer with VCO support from 46.875 to 1682.5MHz
Two-way Radio Devices
(DMR, NXDN, dPMR, TIA-603, STD-T98/102, etc.).


Asahi Kasei Microdevices Corporation, (AKM), launches a fractional-N PLL IC, the AK1574.  A built-in VCO saves space, has low-phase noise, and low-power consumption.  Uses include two-way radios in the VCO configuration with a variable capacitance diode and a winding coil.  This product is targeting professional, portable radio equipment.


● Easy to Modulate the Frequency of an Analog Voice Signal Input

By integrating a dedicated A/D converter, (ADC), frequency modulation of analog voice signal inputs are accomplished.  This makes it easy to replace a VCO built-in PLL without changing the design considerably from the conventional architecture, (inputting the analog voice signal directly to the VCO without transmitting via a quadrature modulator).

● Low Phase Noise and Low Power Consumption

The AK1574 is optimized for narrow band radio below 1GHz.  While achieving low normalized phase noise of -221dBc/Hz, it operates with power consumption of 90mW, (3V/single output), at -6dBm output.
Lock-up time, which takes several ms to several tens of ms for a general VCO with a variable capacitance diode and winding coil configuration, is completed in less than 1ms on the AK1574.  The intermittent operation of the PLL and VCO can reduce the power consumption of the system.

Main Specifications

PLL Synthesizer with VCO support from 46.875 to 1682.5MHz
Product Name AK1574 AK1573/B/C (3 Chip Options)
Operating Frequency46.875 to 1682.5MHz30 to 3000MHz
Consumption Current30mA at 3V, 520.1MHz,
-6dBm Output (Single Output)
33mA at 3V, 1600MHz,
-5dBm Output
Power Supply
/Temperature Range
2.7 to 3.45V (IOVDD: 1.7V Operation)
/ -40 to +85°C
2.7 to 3.3V
/ -40 to +85°C
Normalized Phase Noise-221dBc/Hz (Fractional-N in operation)-223dBc/Hz
In-band Phase Noise-125dBc/Hz at 12.5kHz Offset,
420MHz Output, PFD Frequency =50.4MHz
Not availabe
Modulation Function· Support analog voice signal inputs
(integrated ADC)
· Various Digital I/F: I2S, Left justified, SPI
Not availabe
23-bit ΔΣ Modulator10Hz or less frequency resolution
Not availabe
Variable Output Buffer of Output Current-12 to +6dBm Output (Single Output)-12 to +6dBm Output
Reference Clock Multiplying/Dividing CircuitReduce Integer Boundary Spurious (IBS)Not availabe
Reference Clock Divider Output FunctionCommon System ClockNot availabe
REFCKIN Frequency10 to 60MHz10 to 300MHz
Package36-pin QFN
(5 ×5 × 0.75mm, 0.4mm pitch)
24-pin QFN
(4 ×4 × 0.75mm, 0.5mm pitch)
* Information on this page is current on the date of press release.
* AKM is trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.

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