Direct Modulation/Waveform Generating, 6.1 GHz Fractional-N Frequency Synthesizer
The ADF4158 is a 6.1 GHz, fractional-N frequency synthesizer with modulation and waveform generation capability. It contains a 25-bit fixed modulus, allowing subhertz resolution at 6.1 GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a sigma-delta (Σ-Δ) based fractional interpolator to allow programmable fractional-N division. The INT and FRAC registers define an overall N-divider as N = INT + (FRAC/225).
The ADF4158 can be used to implement frequency shift keying (FSK) and phase shift keying (PSK) modulation. There are also a number of frequency sweep modes available, which generate various waveforms in the frequency domain, for example, sawtooth and triangular waveforms. Sweeps can be set to run automatically, or each step manually triggered by an external pulse. The ADF4158 features cycle slip reduction circuitry, which leads to faster lock times, without the need for modifications to the loop filter.
Control of all on-chip registers is via a simple 3-wire interface. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.
- Frequency modulated continuous wave (FMCW) radar
- Communications test equipment
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EVAL-ADF4158EB1Z evaluates the performance of the ADF4158 frequency synthesizer for phase locked loops (PLL). The board contains the ADF4158 synthesizer, a PC connector, SMA connectors for the power supplies, and an RF output. There is also a low pass loop filter (20 kHz) and a VCO (Z Communications, Inc., VCO940ME03 5.8 GHz) on board. The evaluation board is set up for a 10 MHz PFD comparison frequency. An on-board TCXO provides the 10 MHz reference frequency. A USB cable is included with the board to connect to a PC USB port.
The package also contains Windows® software (XP, Vista, and 7 compatible) to allow easy programming of the synthesizer.
Recommended Linear Regulators
Recommended Divide-by-4 Prescaler
- For a low noise, low power, fixed RF block: ADF5001.
Recommended PLL Active Filter
- For an ultralow noise, rail-to-rail amplifier: OP184.
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