Overview
The ADF4157BRUZ-RL7 from Analog Devices Inc. is a high-performance fractional-N phase-locked loop (PLL) synthesizer designed for RF applications. This device is notable for its cycle slip reduction circuitry, which enhances lock times without requiring modifications to the loop filter. It operates with a supply voltage of 3.3V and can be powered down when not in use, making it energy-efficient. The ADF4157 features a comprehensive set of internal counters, charge pumps, and control mechanisms that enable precise frequency synthesis.
Key Specifications
| Parameter | Value |
|---|---|
| Frequency Range | Up to 6 GHz |
| Supply Voltage | 3.3 V |
| Package Type | 16-TSSOP (0.173", 4.40mm Width) |
| RF R Counter | 5-bit |
| RF N Counter | 12-bit |
| Fractional Counter (FRAC) | 25-bit |
| Input Shift Register | 32-bit |
| Phase Frequency Detector (PFD) | Includes fixed delay element for consistent reference spur level |
Key Features
- Cycle slip reduction circuitry for faster lock times without loop filter modifications
- Comprehensive internal counters: 5-bit RF R counter, 12-bit RF N counter, and 25-bit FRAC counter
- 32-bit input shift register with double-buffered settings for smooth frequency transitions
- Phase frequency detector with a fixed delay element to ensure no dead zone and consistent reference spur level
- Output multiplexer allowing access to various internal points
- Low power consumption with the ability to power down when not in use
Applications
The ADF4157BRUZ-RL7 is suitable for a variety of RF and microwave applications, including:
- Communications analog front ends
- Frequency dividers, multipliers, and detectors
- I/Q modulators and demodulators
- Phase locked loop (PLL) synthesizer and translation loop systems
- RF integrated transmitters, receivers, and transceivers
- Wireless sensor networks
Q & A
- What is the maximum frequency range of the ADF4157BRUZ-RL7?
The ADF4157BRUZ-RL7 operates up to a frequency range of 6 GHz. - What is the supply voltage for the ADF4157BRUZ-RL7?
The supply voltage for the ADF4157BRUZ-RL7 is 3.3 V. - What type of package does the ADF4157BRUZ-RL7 come in?
The ADF4157BRUZ-RL7 comes in a 16-TSSOP package. - What are the key counters in the ADF4157BRUZ-RL7?
The ADF4157BRUZ-RL7 features a 5-bit RF R counter, a 12-bit RF N counter, and a 25-bit FRAC counter. - How does the phase frequency detector (PFD) in the ADF4157BRUZ-RL7 work?
The PFD includes a fixed delay element to ensure no dead zone and a consistent reference spur level. - What is the purpose of the output multiplexer in the ADF4157BRUZ-RL7?
The output multiplexer allows the user to access various internal points on the chip. - Can the ADF4157BRUZ-RL7 be powered down when not in use?
Yes, the ADF4157BRUZ-RL7 can be powered down when not in use to save energy. - What is the benefit of cycle slip reduction circuitry in the ADF4157BRUZ-RL7?
The cycle slip reduction circuitry leads to faster lock times without the need for modifications to the loop filter. - How does the double-buffered setting work in the ADF4157BRUZ-RL7?
The double-buffered settings ensure that new values do not take effect until a new write is performed on Register 0, ensuring smooth frequency transitions. - What are some common applications of the ADF4157BRUZ-RL7?
The ADF4157BRUZ-RL7 is used in communications analog front ends, frequency dividers, multipliers, and detectors, I/Q modulators and demodulators, and other RF and microwave applications.
