Texas Instruments LM4140CCM-2.0

Overview

LM4140CCM-2.0 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference with 2.048 V nominal output, 0.1% initial accuracy, 10 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 excitation source in precision data acquisition systems requiring tight DC accuracy and low thermal drift.

For engineers reviewing the LM4140CCM-2.0 datasheet, LM4140CCM-2.0 pinout, LM4140CCM-2.0 application, or LM4140CCM-2.0 equivalent, key selection criteria include output voltage tolerance over temperature, enable logic compatibility, output drive capability (8 mA), noise performance (2.2 µV_PP, 0.1–10 Hz), and required 1 µF output capacitor for stability.

Technical Context

The LM4140CCM-2.0 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap output voltages (e.g., 2.048 V) with higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 400 mV over temperature.

It features active output discharge during disable mode, fast turn-on (<200 µs), and robust ESD protection (±2000 V HBM). The device operates across 0°C to 70°C and requires a 1 µF output capacitor with specified ESR range for loop stability and transient response.

Key Specifications

Pinout & Package

LM4140CCM-2.0 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. 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 voltage reference applications.

Compared with REF3020AIDBZR and ADR3420ARJZ-R7, LM4140CCM-2.0 delivers identical accuracy and tempco with superior output drive (8 mA vs. ≤5 mA), lower active current (230 µA vs. ≥3.5 µA), and proven stability with 1 µF output capacitance-making it optimal for medium-current, battery-sensitive, and noise-critical applications.

Availability

LM4140CCM-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, medical diagnostics, and automotive battery monitoring requiring stable component supply, long-term calibration retention, and low-power operation.

Supply support for LM4140CCM-2.0 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.

The LM4140 series was designed specifically for high-accuracy, low-drift voltage referencing in battery-powered and portable instrumentation-addressing limitations of traditional bandgap references through EEPROM-based DAC trimming and sub-bandgap output capability.

FAQ

What is the minimum input voltage required for LM4140CCM-2.0 to regulate at 2.048 V?

The LM4140CCM-2.0 requires a minimum input voltage of VREF + 400 mV over temperature, i.e., 2.448 V across the full 0°C to 70°C range. At 25°C, typical dropout is 20 mV, so 2.068 V suffices-but design margins must accommodate worst-case 400 mV dropout. This ensures reliable regulation in low-voltage battery systems such as single-cell Li-ion or coin-cell applications.

Does LM4140CCM-2.0 require an output capacitor, and what type is recommended?

Yes, LM4140CCM-2.0 requires a 1 µF output capacitor connected between VREF and GND for loop stability and transient response. Solid tantalum (e.g., Kemet T491A105M010AS) or multilayer ceramic capacitors meeting ESR specifications (per Figure 23 in SNVS053F) are recommended. Aluminum electrolytics are discouraged due to ESR rise at low temperatures, which may cause instability below 0°C.

How does the enable pin function on LM4140CCM-2.0, and what happens during shutdown?

The enable pin on LM4140CCM-2.0 is active-high: driving it to ≥0.8×VIN enables regulation, while pulling it ≤0.4 V disables output. During shutdown, LM4140CCM-2.0 actively discharges the output capacitor to ground via internal circuitry, ensuring rapid VREF collapse and eliminating hold-up voltage. Supply current drops to ≤1 µA, making it ideal for duty-cycled sensor nodes.

What is the output noise specification for LM4140CCM-2.0, and how does it scale with voltage?

LM4140CCM-2.0 delivers 2.2 µV_PP (0.1–10 Hz) output noise, measured on the 1.024 V variant. Per datasheet Note (7), noise scales linearly with VREF-so for the 2.048 V version, expected noise is ~4.4 µV_PP. This remains exceptionally low for a 2 V-class reference and supports high-resolution data acquisition without additional filtering.

Can LM4140CCM-2.0 drive an ADC reference input directly, and what is its maximum load current?

Yes, LM4140CCM-2.0 can directly drive most ADC reference inputs, with guaranteed output drive capability of ±8 mA. Its low output impedance and 2.2 µV_PP noise make it suitable for 16-bit SAR and delta-sigma ADCs. For loads exceeding 8 mA, external buffering (e.g., op-amp follower) is required-TI provides application circuits for boosted current in the LM4140 datasheet (Figure 30).