ADF4158 Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
ADF4158 is a 6.1 GHz fractional-N frequency synthesizer with direct modulation and waveform generation from Analog Devices, offering fast frequency ramp capability for FMCW radar applications. It integrates a complete PLL loop including VCO interface, mash modulator, and ramp generator in a compact QFN package.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of ADF4158?
- 6.1 GHz fractional-N PLL with direct modulation enables wideband FMCW radar waveform generation without external components
- Fast frequency ramp generation with programmable ramp rates supports continuous wave and pulsed radar signal formats
- Low phase noise floor below -160 dBc/Hz enables high sensitivity radar and communication receiver designs
- SPI-compatible 3-wire serial interface allows flexible microcontroller or FPGA-based register programming
- Compact QFN package with integrated charge pump and sigma-delta modulator reduces system BOM and PCB area
What is ADF4158 used for?
The ADF4158 is specifically designed for FMCW (frequency-modulated continuous wave) radar systems including automotive short-range radar, level measurement radar, and industrial proximity sensing, where fast programmable frequency ramps from a single integrated PLL are essential. Its direct modulation architecture simplifies RF front-end design by generating wideband radar chirp waveforms up to 6.1 GHz directly from the synthesizer without additional external modulation circuitry. The device is also used in electronic warfare signal generation, phase-array antenna feed networks, and high-speed frequency-hopping communication systems requiring sub-microsecond frequency settling.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
What are equivalent replacements for ADF4158?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum output frequency of the ADF4158, and which radar bands does it cover?
The ADF4158 operates up to 6.1 GHz, covering the 5.8 GHz ISM band, the 5.6–5.85 GHz weather radar band, and portions of the C-band used in industrial FMCW radar. With an external VCO tuned to the appropriate range, the 6.1 GHz fractional-N PLL can generate precisely controlled frequency ramps across a 250 MHz or wider sweep bandwidth required for high-resolution distance measurement.
How does the ADF4158 generate FMCW radar chirp waveforms, and what ramp parameters are programmable?
The ADF4158 generates FMCW chirp waveforms through its internal ramp generator, which allows programmable ramp deviation (step size), ramp rate (steps per clock cycle), and ramp mode (sawtooth, triangular, or parabolic) via SPI register settings. Designers can configure chirp durations from a few microseconds to several milliseconds, with frequency deviation up to several hundred MHz per chirp, all controlled by a 25 MHz reference clock input without external DACs or analog modulation circuits.
What phase noise performance does the ADF4158 deliver, and how does it impact radar receiver sensitivity?
The ADF4158 achieves a normalized phase noise floor of approximately -160 dBc/Hz, which translates to in-band phase noise around -90 dBc/Hz at 10 kHz offset for a 5.8 GHz output. In an FMCW radar receiver, this low phase noise floor directly sets the clutter floor for close-range targets, enabling target detection at ranges below 1 meter where the reflected signal competes with transmitter phase noise leaking into the receive path.
Can the ADF4158 replace the ADF4159 in a 24 GHz radar design, and what are the key trade-offs?
The ADF4158 and ADF4159 share the same core fractional-N PLL architecture, but the ADF4159 extends the maximum output frequency to 13 GHz versus the ADF4158's 6.1 GHz, making the ADF4159 required for 24 GHz radar designs that use a frequency doubler stage. If your design uses an external 24 GHz VCO with a 12 GHz PLL input, you need the ADF4159; for 5.8 GHz ISM-band radar driving the VCO directly at 5–6 GHz, the ADF4158 is the lower-cost 24-pin QFN option with equivalent ramp and modulation features.
What interface does the ADF4158 use for configuration, and how many control registers are available?
The ADF4158 uses a 3-wire SPI-compatible serial interface operating at clock rates up to 20 MHz, allowing fast register updates in less than 1 µs per transaction. The device contains 8 programmable 32-bit registers (R0 through R7) that control PLL fractional settings, ramp waveform parameters, charge pump current (1 of 16 levels from 0.31 mA to 5.0 mA), and power-down modes, providing comprehensive control over all synthesizer and modulation parameters from a single microcontroller SPI port.
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Why Buy from FindMyChip
About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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