Texas Instruments LM4140CCMX-2.0/NOPB

Overview

LM4140CCMX-2.0/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference with 2.048 V nominal output, 0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), 20 mV typical dropout at 1 mA, and enable-controlled shutdown consuming ≤1 µA. It serves as a stable reference in precision ADCs, DACs, and portable instrumentation where low supply voltage (as low as 1.8 V) and ultra-low noise (2.2 µV_PP, 0.1–10 Hz) are critical.

For engineers reviewing the LM4140CCMX-2.0/NOPB datasheet, LM4140CCMX-2.0/NOPB pinout, LM4140CCMX-2.0/NOPB application, or LM4140CCMX-2.0/NOPB equivalent, key selection considerations include its C-grade tempco, 1-µF mandatory output capacitor requirement, enable logic thresholds (V_H = 0.8×V_IN, V_L = 0.4 V), and SOIC-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LM4140CCMX-2.0/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.048 V output with 3 ppm/°C stability over 0°C to 70°C. Its P-channel pass transistor architecture supports operation down to V_IN = V_REF + 20 mV (typical) while maintaining regulation under 1–8 mA load.

Enable functionality provides fast turn-on (<200 µs) and active discharge of the output capacitor during shutdown. The device requires a 1-µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types per TI's application guidance.

Key Specifications

Pinout & Package

LM4140CCMX-2.0/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin functions are validated per TI SNVS053F Rev F datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF5020IDR and ADR4520BRZ, LM4140CCMX-2.0/NOPB uniquely balances 0.1% accuracy, 3 ppm/°C tempco, 1.8 V operation, and enable control in SOIC-8 - making it optimal for battery-constrained, space-limited embedded systems requiring programmable power management.

Availability

LM4140CCMX-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, battery-powered medical sensors, automotive diagnostic tools, and industrial process control requiring stable component supply across design-in, prototyping, and volume production phases.

Supply support for LM4140CCMX-2.0/NOPB 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, with decades of leadership in precision analog ICs and reference design expertise.

The LM4140 product line was engineered to deliver sub-bandgap precision references with EEPROM-based trimming for high-volume manufacturability - targeting portable, battery-powered, and industrial measurement systems demanding accuracy, low noise, and low power.

FAQ

What is the minimum input voltage required for stable operation of LM4140CCMX-2.0/NOPB?

The LM4140CCMX-2.0/NOPB operates with a minimum input voltage of 1.8 V - just 20 mV above its 2.048 V output under 1 mA load (typical dropout). This enables direct use with single-cell Li-ion (2.7–4.2 V), NiMH (1.2 V × 2), or coin-cell sources when paired with appropriate regulation. Operation below 1.8 V risks loss of regulation and increased output drift.

Does LM4140CCMX-2.0/NOPB require an output capacitor, and what type is recommended?

Yes - a 1 µF capacitor between VREF and GND is mandatory for loop stability and transient response, as specified in the TI SNVS053F datasheet. Tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors (e.g., Murata GRM42-6Y5V225Z16) are validated options. Ceramic types require verification of ESR (≥0.1 Ω) and capacitance retention over temperature to avoid oscillation.

How does the enable pin function on LM4140CCMX-2.0/NOPB, and what are its voltage thresholds?

The enable pin (Pin 3) controls output state: driven high (≥0.8×V_IN) for normal operation; driven low (≤0.4 V) for shutdown. During shutdown, output drops to 0 V within microseconds and supply current falls to ≤1 µA. The pin must never float - tie to VIN if unused. Logic compatibility includes 1.8 V, 3.3 V, and 5 V GPIO without level shifters.

What is the output noise performance of LM4140CCMX-2.0/NOPB, and how does it scale with voltage?

LM4140CCMX-2.0/NOPB delivers 2.2 µV_PP (0.1–10 Hz) output noise, linearly proportional to V_REF. Since its 2.048 V output is ~2× the 1.024 V option used in noise characterization, its actual noise is 2.2 µV_PP - matching the datasheet's normalized specification. This ultra-low noise preserves ENOB in 16+ bit data converters without post-filtering.

Can LM4140CCMX-2.0/NOPB drive multiple ADC references simultaneously?

Yes - LM4140CCMX-2.0/NOPB sources/sinks up to ±8 mA, sufficient to drive multiple high-impedance ADC references (e.g., 12-bit SAR, 16-bit sigma-delta) without external buffering. For >8 mA total load or low-impedance buffers, TI recommends adding a unity-gain op-amp follower. Load regulation remains within 20 ppm/mA up to 8 mA, ensuring consistent accuracy across varying channel counts.