Overview
The HMC984LP4ETR, produced by Analog Devices Inc., is a high-performance, ultra-low phase noise SiGe BiCMOS Phase-Frequency Detector and Charge Pump. This component is designed to be used in conjunction with the HMC983LP5E (Fractional Frequency Divider) to form a high-performance, low-noise, ultra-low spurious emission fractional-N frequency synthesizer. However, it can also operate as a stand-alone, low-phase noise phase-frequency detector.
The device is housed in a compact 24-pin, 4x4 mm LP4 package and features a 14-bit reference frequency R-Divider, automatic and configurable Lock Detect Indicator, and integrated Cycle Slip Prevention (CSP) capability. It supports differential VCO input and a reference frequency up to 150 MHz.
Key Specifications
| Parameter | Conditions | Min. | Typ. | Max. | Units |
|---|---|---|---|---|---|
| Integer Boundary Spurs | Fpd=50 MHz | -85 | dBc | ||
| Logic Inputs VIH | Input High Voltage | 0.4 | V | ||
| Logic Inputs VIL | Input Low Voltage | 0.4 | V | ||
| Logic Outputs VOH | Output High Voltage | DVDD - 0.4 | V | ||
| Logic Outputs VOL | Output Low Voltage | 0.4 | V | ||
| DC Load | 1.5 | mA | |||
| Serial Port Clock Frequency | 30 | MHz | |||
| AVDD, RVDD Analog Supplies | 2.8 | 3 | 3.3 | V | |
| VCCPD Analog Supply for PD | 4.5 | 5 | 5.5 | V | |
| VPPCP CP Analog Supply | 4.5 | 5 | 5.5 | V | |
| VDDCP CP Digital Supply | 4.5 | 5 | 5.5 | V |
Key Features
- Ultra-Low Phase Noise: -231 dBc/Hz FOM in Integer Mode, -227 dBc/Hz FOM in Fractional Mode
- Ultra Low Spurious Emissions: Less than 60 dBc
- Differential Phase Detector Input
- 14-bit Reference Frequency Divider
- Automatic and/or Configurable Lock Detect Indicator
- Integrated Cycle Slip Prevention (CSP) capability
- Adjustable Charge Pump gain and offset current for improved linearity and performance
- Soft Reset feature to reset all registers to default values without power cycling
- Phase Measurement Capability and GPIO (General Purpose Input/Output)
- Test Pin and support for seamless interface to VCOs and active loop filters with inverted polarity
Applications
- Test Equipment
- Portable Instruments
- High Performance Fractional-N Frequency Synthesizers with Ultra Low Spurious Emissions
- Military
Q & A
- What is the primary function of the HMC984LP4ETR?
The HMC984LP4ETR is a high-performance, ultra-low phase noise SiGe BiCMOS Phase-Frequency Detector and Charge Pump, designed for use in fractional-N frequency synthesizers.
- What is the maximum reference frequency supported by the HMC984LP4ETR?
The device supports a reference frequency as high as 150 MHz.
- What type of package does the HMC984LP4ETR come in?
The HMC984LP4ETR is housed in a 24-pin, 4x4 mm LP4 package.
- What are the key specifications for phase noise in the HMC984LP4ETR?
The device has ultra-low phase noise of -231 dBc/Hz FOM in Integer Mode and -227 dBc/Hz FOM in Fractional Mode.
- Does the HMC984LP4ETR support differential VCO input?
- What is the purpose of the integrated Cycle Slip Prevention (CSP) capability?
The integrated CSP capability significantly improves frequency lock time when used with the HMC983LP5E.
- Can the HMC984LP4ETR be used as a stand-alone component?
- What is the function of the adjustable Charge Pump gain and offset current?
The adjustable Charge Pump gain and offset current improve linearity and performance of the device.
- Does the HMC984LP4ETR have a Soft Reset feature?
- In what types of applications is the HMC984LP4ETR typically used?
The HMC984LP4ETR is typically used in test equipment, portable instruments, high-performance fractional-N frequency synthesizers, and military applications.
