Analog Devices Inc. HMC1031MS8E

Overview

HMC1031MS8E from Analog Devices is an integer-N PLL-based clock generator IC designed for low-jitter reference synthesis and jitter attenuation in precision timing systems. It supports 0.1 MHz to 500 MHz VCOIN input, 140 MHz phase detector rate, hardware-selectable 1×/5×/10× multiplication, 50 µA charge pump current, and operates from 2.7–3.5 V supply. It is used with external loop filters and VCXOs to clean noisy references in high-performance ADC/DAC and RF LO subsystems.

For engineers reviewing the HMC1031MS8E datasheet, HMC1031MS8E pinout, HMC1031MS8E application, or HMC1031MS8E equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and confirmed alternative options - all strictly derived from Analog Devices' Rev. C datasheet and official evaluation board documentation.

Technical Context

The HMC1031MS8E implements a fully integrated integer-N PLL architecture with a 140 MHz phase-frequency detector (PFD), 50 µA charge pump, and hardware-programmable N-divider (1/5/10) controlled via D0/D1 pins - eliminating serial interface requirements. Its low-current design (1.95 mA typical) and power-down mode (0.8 µA at +85°C) enable integration into thermally constrained or battery-sensitive timing subsystems.

It requires external ac-coupled REFIN and VCOIN inputs, operates with VCXOs up to 500 MHz, and delivers lock detection via dedicated LKDOP output. The device's 50 µA charge pump enables narrow-loop-bandwidth filter designs using smaller capacitors - critical for jitter attenuation applications where loop bandwidths are typically <2 kHz.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (HRM-8-1), 4.9 mm × 3.0 mm, RoHS-compliant, JEDEC MO-187-AA compliant.

Key Features

Applications

Availability

HMC1031MS8E is available at Aetrix Electronics and suitable for high-precision ADC clocking, OCXO-based frequency translation, low-bandwidth jitter attenuation, and RF LO reference conditioning requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for HMC1031MS8E 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.

The HMC1031MS8E belongs to Analog Devices' Hittite Microwave PLL product line, engineered specifically for low-power, hardware-configurable clock generation and jitter attenuation in space-constrained, thermally sensitive timing subsystems.

FAQ

What is the primary function of the HMC1031MS8E in a timing system?

The HMC1031MS8E serves as an integer-N PLL-based clock generator that locks an external VCXO to a reference input, enabling precise frequency multiplication (1×/5×/10×) and jitter attenuation. Its hardware-programmed division ratios, 140 MHz PFD, and 50 µA charge pump make it ideal for cleaning noisy references in ADC, DAC, and RF LO applications - all within the HMC1031MS8E's 8-lead MSOP package.

Can the HMC1031MS8E operate with a 10 MHz reference and generate a 500 MHz output?

No - the HMC1031MS8E does not generate 500 MHz directly. Its VCOIN input accepts up to 500 MHz, but output frequency depends on the external VCXO/VCO connected to VCOIN. For a 10 MHz reference, the HMC1031MS8E can only produce 10 MHz (N=1), 50 MHz (N=5), or 100 MHz (N=10). To reach 500 MHz, a higher-frequency VCXO (e.g., 500 MHz) must be used and locked to the reference via the HMC1031MS8E's feedback path.

How does the HMC1031MS8E's lock detect output (LKDOP) behave during power-down mode?

During power-down mode (D0 = D1 = 0), the HMC1031MS8E tristates REFIN, VCOIN, and CP outputs, and the LKDOP pin goes to high-impedance - it does not assert a defined logic level. System designers must treat LKDOP as invalid during power-down and rely on external control logic to manage lock status sequencing. This behavior is explicitly documented in the "Power-Down" section of the HMC1031MS8E datasheet Rev. C, Page 3.

What is the minimum recommended loop filter capacitor value for stable operation of the HMC1031MS8E?

The HMC1031MS8E datasheet specifies no absolute minimum capacitor value, but Table 5 shows functional configurations using C8 values as low as 300 pF (Configuration 3, 2 kHz bandwidth). However, for jitter attenuation applications targeting ≤100 Hz bandwidth, 220 nF (Configuration 1) is validated. Capacitor selection must prioritize low leakage (<1.5 µA for 10 MHz reference) - MLCC types like Murata GRM155R71E333KA88 are recommended per the HMC1031MS8E datasheet Rev. C, Page 11.

Is the HMC1031MS8E pin-compatible with any other Analog Devices clock generator ICs?

No - the HMC1031MS8E has a unique 8-pin MSOP pinout optimized for its hardware-programmed N-divider and dedicated LKDOP output. While other Analog Devices PLLs (e.g., ADF4xxx series) share functional similarity, none match the HMC1031MS8E's pin assignment, charge pump current, or division control scheme. Direct replacement would require PCB redesign. The HMC1031MS8E datasheet Rev. C confirms no pin-compatible alternatives are listed in the Ordering Guide or Pin Configuration table.