Overview
The ADF4158CCPZ, produced by Analog Devices Inc., is a 6.1 GHz fractional-N frequency synthesizer designed with direct modulation and waveform generation capabilities. This device is particularly suited for applications requiring high-frequency resolution and fast lock times. It features a 25-bit fixed modulus, allowing for subhertz frequency resolution, and includes a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. The ADF4158 also supports various modulation schemes such as frequency shift keying (FSK) and phase shift keying (PSK), as well as multiple frequency sweep modes generating sawtooth and triangular waveforms.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| RF Frequency Range | - | - | 6.1 GHz | - | - |
| Fixed Modulus | - | - | 25-bit | - | Allows subhertz frequency resolution |
| Power Supply | 2.7 V | - | 3.3 V | V | - |
| Charge Pump Current | - | - | 5 mA | A | Maximum |
| Normalized Phase Noise Floor | - | - | -216 dBc/Hz | - | PLL loop bandwidth = 500 kHz; measured at 100 kHz offset |
| Operating Temperature | -40°C | - | 125°C | °C | - |
Key Features
- Cycle slip reduction circuitry for faster lock times without modifications to the loop filter
- Direct modulation and waveform generation capability
- Support for FSK and PSK modulation
- Multiple frequency sweep modes (sawtooth, triangular, parabolic ramp, etc.)
- Programmable charge pump currents and reference divider
- 3-wire serial interface for control of on-chip registers
- Power-down mode for reduced power consumption
- Qualified for automotive applications
Applications
- Frequency modulated continuous wave (FMCW) radar
- Communications test equipment
- Automotive applications
Q & A
- What is the maximum RF frequency range of the ADF4158?
The ADF4158 has a maximum RF frequency range of 6.1 GHz.
- What is the resolution of the frequency synthesizer?
The ADF4158 features a 25-bit fixed modulus, allowing for subhertz frequency resolution.
- What types of modulation does the ADF4158 support?
The ADF4158 supports frequency shift keying (FSK) and phase shift keying (PSK) modulation.
- What is the power supply range for the ADF4158?
The power supply range for the ADF4158 is from 2.7 V to 3.3 V.
- Does the ADF4158 have a power-down mode?
- What is the purpose of the cycle slip reduction circuitry?
The cycle slip reduction circuitry helps in achieving faster lock times without the need for modifications to the loop filter.
- How is the charge pump current controlled in the ADF4158?
The charge pump current is controlled by connecting a resistor between the RSET pin and ground.
- What is the operating temperature range for the ADF4158?
The operating temperature range for the ADF4158 is from -40°C to +125°C.
- Is the ADF4158 qualified for automotive applications?
- What interface is used to control the on-chip registers of the ADF4158?
The ADF4158 uses a simple 3-wire serial interface to control the on-chip registers.
