- New Product Information -
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.
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).
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.
AK1574PLL Synthesizer with VCO support from 46.875 to 1682.5MHz
|Product Name||AK1574||AK1573/B/C (3 Chip Options)|
|Operating Frequency||46.875 to 1682.5MHz||30 to 3000MHz|
|Consumption Current||30mA at 3V, 520.1MHz,|
-6dBm Output (Single Output)
|33mA at 3V, 1600MHz,
|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
|Modulation Function||· Support analog voice signal inputs|
· Various Digital I/F: I2S, Left justified, SPI
|23-bit ΔΣ Modulator||10Hz 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 Circuit||Reduce Integer Boundary Spurious (IBS)||Not availabe|
|Reference Clock Divider Output Function||Common System Clock||Not availabe|
|REFCKIN Frequency||10 to 60MHz||10 to 300MHz|
(5 ×5 × 0.75mm, 0.4mm pitch)
(4 ×4 × 0.75mm, 0.5mm pitch)