Analog Devices Inc. HMC900LP5ETR

Summary of HMC900LP5ETR Product

The HMC900LP5ETR, manufactured by Analog Devices Inc., is a highly programmable low pass filter IC designed to operate within the 3.5 MHz to 50 MHz range. This device embodies a 6th order filter topology, providing high precision, flexibility, and integration essential for modern RF, baseband, and communications system designs. Housed in a compact 32-lead QFN package (5×5 mm), the HMC900LP5ETR also includes an integrated ADC driver amplifier, making it a compelling solution for engineers seeking compact and robust filtering in demanding applications.

Main Attributes and Operational Functions of HMC900LP5ETR

The HMC900LP5ETR is distinguished by its dual programmability and advanced calibration features. With a gain setting selectable between 0 dB and 10 dB and an SPI interface for serial programming, users can tailor the filter’s cutoff frequency and bandwidth to precise application requirements. The filter supports bandwidths from 3.5 MHz up to 50 MHz, with a bypass mode capability extending operation up to 100 MHz.

The device incorporates automatic filter calibration using any reference clock rate from 20 MHz to 80 MHz, ensuring bandwidth accuracy within ±2.5% when calibrated. One-time programmable (OTP) memory allows users to "set and forget" critical parameters such as gain and bandwidth, streamlining both development and deployment. External control of common mode output levels simplifies interface design, and a filter bypass option provides flexibility for system-level optimization. The HMC900LP5ETR’s matched filter paths are engineered for superior quadrature balance, making it especially suitable for I/Q communications.

Electrical and RF Specifications of HMC900LP5ETR

Precision performance is a hallmark of the HMC900LP5ETR. In standard operating conditions, the device achieves a low noise figure (12–25 dB depending on gain and source impedance), high linearity with output IP3 up to +30 dBm at lower bandwidths, and sideband suppression of up to 45 dB.

The maximum passband gain error is limited to ±0.5 dB relative to an ideal filter response, facilitating reliable system-level gain planning. Group delay variation is minimized, with typical values in the nanosecond range at operational bandwidths, ensuring consistent timing performance in signal chains. Output noise is exceptionally low (8–25 nV/√Hz depending on bandwidth and gain selection). Differential input impedance is configurable for robust interfacing, supporting both 400 Ω and 1000 Ω sources, and full-scale differential input/output swings are supported up to 2 Vppd.

The IC operates from a single 5V supply (with ±5% tolerance) and consumes approximately 130 mA, balancing high performance with manageable power requirements. Digital interface pins accept standard levels, with CALCK and SCLK frequencies up to 80 MHz, enabling rapid filter calibration and configuration.

Package Outline, Pinout, and Physical Specifications of HMC900LP5ETR

Engineered for surface mount deployment, the HMC900LP5ETR utilizes a 32-lead QFN package with exposed pad for improved thermal management and grounding. Package body material is low-stress injection molded plastic, compliant with RoHS requirements, and all leads feature 100% matte tin plating for reliable solderability.

The pinout supports separate analog and digital supplies, input/output pairs for both in-phase (I) and quadrature (Q) channels, calibration clock input, SPI data interface, and external common mode adjustment. Most N/C pins are recommended to be connected to ground for optimal electrical performance. The package exhibits a thermal resistance of 10°C/W junction-to-ground paddle and withstands reflow soldering up to 260°C.

Referencing manufacturer-suggested PCB land patterns and soldering procedures is key for achieving reliable installation and ongoing thermal stability.

Common Uses and System Design Guidelines for HMC900LP5ETR

The HMC900LP5ETR finds utility in a wide array of RF and communications domains:

Baseband filtering before A/D or after D/A converters in wireless transceivers, including GSM/GPRS, WCDMA, and TD-SCDMA standards.

Integrated direct conversion receivers (DCR) when used in conjunction with mixers and variable gain amplifiers.

Software-defined radio architectures where flexible, precise filtering is required.

Anti-aliasing and reconstruction filters in digital systems.

Test and measurement equipment requiring configurable signal conditioning.

In practical engineering scenarios, the device’s calibration and programmability enable rapid adaptation to varied signal paths and environments. The bypass mode, high linearity, and low group delay make the HMC900LP5ETR suitable for mixed-signal front ends, ensuring minimal distortion and preserving signal fidelity in complex signal processing chains.

Alternative or Substitute Models for HMC900LP5ETR

Given the HMC900LP5ETR’s status as an obsolete component, engineers are advised to evaluate equivalent or replacement filter ICs from Analog Devices or other suppliers. Key criteria for replacement selection include programmable bandwidth in the 3.5–50 MHz range, integrated ADC driver capability, support for high order filter topology (such as Butterworth response), precision calibration features, and compatible surface-mount packages.

Products such as the Analog Devices HMC900LP5E (base part number) and other high-performance programmable low-pass filters in the Analog Devices portfolio may provide similar operational profiles. When migrating to an alternate model, review all electrical, calibration, and mechanical interfaces to ensure alignment with the HMC900LP5ETR’s design within your system context.

Information on Reliability, Environmental Conditions, and Handling Procedures for HMC900LP5ETR

The HMC900LP5ETR is assessed at MSL 1 for unlimited moisture sensitivity, with guaranteed resistance to standard reflow temperatures up to 260°C. Absolute maximum ratings for all power, data, and signal pins are provided in the datasheet and must be strictly observed to avoid permanent damage and maintain reliable service life.

Operating temperature range spans -40°C to +85°C, supporting deployment in both commercial and industrial environments. Storage temperature extends down to -65°C and up to +125°C, facilitating logistics and inventory management. Electrostatic discharge sensitivity is rated at 1 kV (HBM, Class 1C); standard ESD precautions are necessary during all handling and assembly operations.

Conclusion

The Analog Devices HMC900LP5ETR presents an advanced, programmable low pass filter solution for modern RF and baseband applications, offering high precision, flexibility, and integration to satisfy demanding system requirements. Its comprehensive calibration features, robust performance across noise and linearity metrics, and convenient surface mount package collectively make it a strong candidate for new designs—while careful attention to replacement models is essential for legacy applications due to its obsolescence. For engineers and procurement professionals, understanding the technical scope and practical integration considerations outlined above ensures that design and sourcing decisions are both technically sound and forward-looking.