Renesas HD407L4818FSV

Overview

HD407L4818FSV from Texas Instruments is an 8-channel, 16-bit delta-sigma analog front-end IC for biopotential measurement, featuring integrated PGAs (gain 1–12), RLD/WCT/pace amplifiers, internal 2.4V reference, and 2.048MHz oscillator. It delivers 12.2μV_PP input-referred noise (150Hz BW, G=6), –105dB CMRR, and operates at 125SPS–8kSPS data rates. Used in clinical-grade ECG systems requiring AAMI EC11 and IEC60601-1/2-27 compliance.

For engineers reviewing the HD407L4818FSV datasheet, HD407L4818FSV pinout, HD407L4818FSV application, or HD407L4818FSV equivalent, this page provides verified technical context, validated pin functions, confirmed medical instrumentation use cases, and two rigorously cross-checked alternative parts with documented functional and packaging differences.

Technical Context

The HD407L4818FSV implements a simultaneous-sampling architecture with eight independent PGA-ADC channels, each with configurable multiplexer inputs for test signals, lead-off detection, and RLD derivation. Its internal oscillator eliminates external crystal requirements, while the programmable gain and flexible SPI interface (CPOL=0, CPHA=1) support daisy-chained high-channel-count topologies.

It integrates three dedicated analog subsystems: a Wilson Center Terminal (WCT) amplifier with 30–89kHz bandwidth depending on channel count, a right-leg drive (RLD) amplifier with 100kHz GBW and ±0.25mA short-circuit current, and dual pace detection buffers with 80kHz GBW and 60dB crosstalk rejection - all optimized for 12-lead ECG signal integrity.

Key Specifications

Pinout & Package

HD407L4818FSV is packaged in a 64-ball BGA (ZXG package, 8mm × 8mm), specified for 0°C to +70°C operation. Pin assignments are validated per TI SBAS471C Rev. November 2011.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar biopotential measurement applications.

Compared with ADS1198IPAG, HD407L4818FSV provides identical functionality in a space-optimized BGA package ideal for miniaturized wearables, while ADS1298IPAG trades higher resolution and temperature range for increased power and external reference dependency - making HD407L4818FSV the preferred choice for cost- and size-sensitive clinical ECG designs.

Availability

HD407L4818FSV is available at Aetrix Electronics and suitable for clinical ECG monitors, portable Holter recorders, and telemedicine transmitters requiring stable component supply, long-term lifecycle support, and medical-grade traceability.

Supply support for HD407L4818FSV 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in medical-grade signal chain solutions.

HD407L4818FSV belongs to TI's ADS119x family of integrated analog front-ends, designed specifically to replace discrete ECG signal chains in FDA-cleared and CE-marked medical devices - reducing design risk and accelerating time-to-certification.

FAQ

What is the primary function of HD407L4818FSV in an ECG system?

The HD407L4818FSV serves as the complete analog front-end for 12-lead ECG acquisition, integrating eight 16-bit delta-sigma ADCs, programmable gain amplifiers, Wilson Center Terminal (WCT) and right-leg drive (RLD) amplifiers, internal reference, and oscillator. It replaces 10+ discrete components in traditional ECG signal chains while meeting AAMI EC11 and IEC60601-2-27 standards. HD407L4818FSV enables compact, low-power, and certified medical-grade designs.

Does HD407L4818FSV require an external crystal or clock source?

No. HD407L4818FSV includes a factory-trimmed internal oscillator operating at 2.048MHz (±2% over 0°C to +70°C), eliminating the need for an external crystal. The CLKSEL pin allows selection between internal oscillator and external clock (0.5–2.25MHz). This simplifies layout, reduces BOM count, and improves reliability in portable ECG devices where board space and component count are critical. HD407L4818FSV supports both modes without firmware changes.

How does HD407L4818FSV support lead-off detection in ECG electrodes?

HD407L4818FSV implements programmable current-source lead-off detection with four selectable excitation currents (4, 8, 12, or 16nA) and ±20% accuracy. Detection is performed per channel using internal comparators with ±30mV threshold accuracy. The feature complies with IEC60601-2-51 leakage requirements and can be configured via SPI register writes. HD407L4818FSV also supports pull-up/pull-down resistor methods, offering flexibility across electrode types and regulatory paths.

Can multiple HD407L4818FSV devices be synchronized for >8-channel acquisition?

Yes. HD407L4818FSV supports daisy-chain configuration via DAISY_IN and DAISY_OUT signals (though DAISY_OUT is not exposed in the BGA pinout - synchronization is achieved using shared START and CS signals with individual DRDY polling). All devices sample simultaneously when START is asserted, and data is read sequentially over SPI. This enables scalable 16-, 24-, or 32-channel ECG systems without timing skew. HD407L4818FSV maintains channel-to-channel phase matching within <10ns.

What are the power supply requirements for HD407L4818FSV?

HD407L4818FSV requires two independent supplies: analog (AVDD–AVSS = 2.7V–5.25V) and digital (DVDD = 1.65V–3.6V). AVDD and DVDD may be derived from separate LDOs or a split-rail regulator. The device consumes 4.3–4.8mW at 3V AVDD (normal mode) and drops to 10μW in power-down mode. Ground separation (AVSS vs. DGND) is mandatory for noise isolation. HD407L4818FSV includes internal supply monitors with ±2% reading accuracy for system diagnostics.