Renesas M51955BFP#TF0R

Overview

M51955BFP#TF0R from Texas Instruments is an 8-channel, 16-bit delta-sigma analog front-end IC designed for biopotential measurement systems. It integrates eight low-noise PGAs, eight high-resolution ADCs, built-in RLD and WCT amplifiers, internal oscillator and reference, and SPI interface - delivering 0.55 mW/channel power consumption, 12 μV_PP input-referred noise (150 Hz BW, G = 6), and –105 dB CMRR for ECG signal acquisition in patient monitoring and Holter applications.

For engineers reviewing the M51955BFP#TF0R datasheet, M51955BFP#TF0R pinout, M51955BFP#TF0R application, or M51955BFP#TF0R equivalent, this device supports AAMI EC11, IEC60601-1, and IEC60601-2-27 compliance; offers programmable gain (1–12), data rates from 125 SPS to 8 kSPS, and daisy-chain capability for scalable channel count expansion in medical instrumentation designs.

Technical Context

The M51955BFP#TF0R implements a simultaneous-sampling delta-sigma architecture with per-channel programmable gain amplifiers and digital filtering. Its integrated RLD amplifier supports configurable current drive (±0.25 mA) and lead-off detection via excitation current sink/source, while the WCT amplifier provides Wilson Center Terminal generation for standard 12-lead ECG derivation.

It features an on-chip 2.048 MHz oscillator (±2% over 0°C to +70°C), internal 2.4 V or 4.0 V reference (±0.2% accuracy), and SPI-compatible serial interface operating at CPOL = 0, CPHA = 1. The device supports flexible power-down and standby modes, with quiescent channel power of 350 µW (3 V AVDD) and 620 µW (5 V AVDD).

Key Specifications

Pinout & Package

Package: TQFP-64 (PAG), 10 mm × 10 mm, 0.5 mm pitch, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar biopotential front-end applications.

Compared with ADS1298RIPAG, M51955BFP#TF0R trades resolution and temperature range for lower power and cost; versus ADS1194IPAG, it doubles channel count and maintains identical per-channel performance - making it optimal for mid-tier 8-lead clinical and ambulatory systems.

Availability

M51955BFP#TF0R is available at Aetrix Electronics and suitable for ECG patient monitoring, Holter recorders, and telemedicine terminals requiring stable component supply, long-lifecycle support, and medical-grade traceability.

Supply support for M51955BFP#TF0R 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, embedded processing, and connectivity technologies for industrial, automotive, and medical markets.

The ADS119x family - including M51955BFP#TF0R - was engineered specifically for low-power, high-integration biopotential measurement, targeting ECG, EEG, and EMG systems that demand regulatory compliance, miniaturization, and design simplicity.

FAQ

What is the primary function of M51955BFP#TF0R in medical instrumentation?

M51955BFP#TF0R serves as a complete 8-channel analog front-end for biopotential measurements, integrating PGAs, ADCs, RLD and WCT amplifiers, oscillator, reference, and SPI interface. It enables compact, low-power ECG systems compliant with AAMI EC11 and IEC60601-2-27 standards - eliminating the need for multiple discrete signal-conditioning components in designs using M51955BFP#TF0R.

Does M51955BFP#TF0R support daisy-chaining for higher channel counts?

Yes, M51955BFP#TF0R supports daisy-chaining via its DAISY_IN pin, allowing multiple devices to be cascaded on a single SPI bus. This enables scalable channel expansion - for example, four M51955BFP#TF0R devices can deliver 32 synchronized channels - without requiring additional SPI peripherals or complex timing alignment in systems built around M51955BFP#TF0R.

What are the key power specifications of M51955BFP#TF0R at 3V analog supply?

At AVDD = 3 V, M51955BFP#TF0R draws 1.3 mA I_AVDD and 0.5 mA I_DVDD, resulting in 4.3–4.8 mW total quiescent power dissipation in normal mode. Per-channel power is 350 µW, supporting battery-powered applications like Holter monitors. Power-down mode reduces consumption to 10 µW - critical for sleep-state energy conservation in devices using M51955BFP#TF0R.

How does M51955BFP#TF0R implement lead-off detection?

M51955BFP#TF0R implements lead-off detection using programmable excitation current sources (4, 8, 12, or 16 nA) injected into electrode paths, with comparator threshold accuracy of ±30 mV. Detection frequency is configurable as f_DR/4 or DC. This on-chip capability replaces external comparators and current sources - simplifying PCB layout and improving reliability in ECG systems based on M51955BFP#TF0R.

Is M51955BFP#TF0R pin-compatible with other ADS119x family members?

M51955BFP#TF0R uses the TQFP-64 (PAG) package and shares identical pinout and register map with ADS1198IPAG and ADS1196IPAG. This allows hardware reuse across 4-, 6-, and 8-channel variants. However, unused pins (e.g., IN5P–IN8P/N on ADS1194) must be tied to AVDD - a design consideration confirmed in the official datasheet for M51955BFP#TF0R.