Analog Devices Inc. HMC1032LP6GETR

Overview

HMC1032LP6GETR from Analog Devices (formerly Hittite Microwave) is a low-noise clock generator IC with integrated fractional-N PLL and VCO, delivering differential output frequencies from 125 MHz to 350 MHz. It achieves 75 fs RMS jitter (typical at 350 MHz), -165 dBc/Hz phase noise floor, and supports up to 100 MHz phase detector rate-enabling high-integrity clocking for 10G Ethernet line cards and SERDES PHY interfaces.

For engineers reviewing the HMC1032LP6GETR datasheet, HMC1032LP6GETR pinout, HMC1032LP6GETR application, or HMC1032LP6GETR equivalent, key selection criteria include its 24-bit frequency resolution (3 Hz step), Exact Frequency Mode for near-zero output error, built-in digital self-test, and 40-lead 6×6 mm QFN package with exposed ground paddle for RF integrity.

Technical Context

The HMC1032LP6GETR implements a fractional-N PLL architecture with a Delta-Sigma modulator and integrated VCO, enabling wide loop bandwidths up to 250 kHz while maintaining spectral purity. Its charge pump operates at 0.02–2.54 mA with 20 µA step size, and the PD supports integer mode up to 125 MHz and fractional mode up to 100 MHz.

Differential RF outputs (RF_P/RF_N) feature 2-bit amplitude control (four gain settings), mute capability, and 47.5–52.5% duty cycle across 155.52/312.5/350 MHz. The device uses separate 3.3 V and 5 V supply domains-including dedicated VCO core (VCC2), charge pump (VPPCP), and reference (RVDD) rails-to isolate noise-sensitive blocks.

Key Specifications

Pinout & Package

40-lead, 6×6 mm QFN package (RoHS-compliant, MSL1, matte tin finish) with exposed ground paddle requiring solder connection to PCB RF ground plane per Hittite Application Note land pattern guidance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generator applications.

Compared with LMK04828BISQE/NOPB and Si5341-B-GM, the HMC1032LP6GETR delivers superior single-output jitter performance in a compact 6×6 mm footprint with true exact-frequency synthesis-making it optimal for space-constrained, high-performance telecom clocking where one clean output suffices.

Availability

HMC1032LP6GETR is available at Aetrix Electronics and suitable for 10G Ethernet line cards, OTN transport equipment, and high-speed data converter clocking requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for HMC1032LP6GETR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Hittite Microwave in 2014 and integrates its high-frequency RF and microwave expertise into precision timing and signal chain solutions.

The HMC1032LP6GETR belongs to Hittite's clock generator product line, designed specifically for carrier-grade telecom infrastructure demanding ultra-low jitter, GR-253/G.8251 compliance, and integrated VCO simplicity.

FAQ

What is the maximum phase detector frequency supported by the HMC1032LP6GETR in fractional-N mode?

The HMC1032LP6GETR supports a maximum phase detector frequency of 100 MHz in Fractional Mode B. This requires respecting the minimum N-divider value (e.g., PFD rate = f_VCO/20 or 100 MHz, whichever is less). At 350 MHz output, the minimum N is 3.5, satisfying this constraint. The HMC1032LP6GETR datasheet specifies this limit under "PD Frequency Fractional Mode B" in Electrical Specifications Table 3.

Does the HMC1032LP6GETR require an external loop filter, and what are the critical design considerations?

Yes, the HMC1032LP6GETR requires an external passive loop filter connected between CP and VTUNE pins. Critical design considerations include matching the filter's pole/zero locations to the target loop bandwidth (e.g., 250 kHz for jitter attenuation), using low-ESR capacitors and precision resistors, and shielding VTUNE from digital noise. The HMC1032LP6GETR Loop Filter Configuration Table (Figure 9) provides validated R/C values for 135 kHz, 150 kHz, and 250 kHz bandwidths.

How does the Exact Frequency Mode in the HMC1032LP6GETR improve timing accuracy compared to standard fractional-N synthesizers?

Exact Frequency Mode uses Hittite's enhanced Delta-Sigma modulator to eliminate residual fractional spurs and reduce long-term frequency error to near 0 Hz-enabling precise generation of standards-based rates like 155.52 MHz and 167.33 MHz without post-fabrication calibration. Unlike generic fractional-N ICs that exhibit ppm-level drift, the HMC1032LP6GETR maintains sub-0.1 ppm accuracy across temperature and voltage, directly supporting ITU-T G.8262 compliance.

Can the HMC1032LP6GETR generate single-ended outputs, and what is the recommended termination?

Yes, the HMC1032LP6GETR can operate in single-ended mode by disabling RF_N and using RF_P only. The datasheet specifies single-ended output swing as 0.25–1.35 V_pp into 50 Ω. AC coupling is mandatory; a 0.1 µF series capacitor followed by 50 Ω to ground is recommended. For best jitter performance, maintain controlled 50 Ω impedance and minimize stub length-verified in HMC1032LP6GETR Evaluation PCB layout guidelines.

What power supply sequencing is required for reliable startup of the HMC1032LP6GETR?

No strict power supply sequencing is mandated, but Analog Devices recommends ramping 3.3 V supplies (AVDD, RVDD, DVDD3V) before 5 V supplies (VPPCP, VCC1, VCC2) to ensure digital logic initializes prior to analog block activation. The HMC1032LP6GETR incorporates internal power-on reset with 250 µs delay and triggers reset if DVDD drops below 1.5 V. Full functionality is guaranteed once all supplies settle within ±5% of nominal values across -40°C to +85°C.