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Texas Instruments LM4140CCMX-1.0
- Part No.:
- LM4140CCMX-1.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140CCMX-1.0.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
LM4140CCMX-1.0 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 1.024 V output with ±0.1% initial accuracy, 10 ppm/°C temperature coefficient (C grade), and 2.2 µVPP (0.1–10 Hz) output noise. It operates down to 1.8 V input, features an enable pin for shutdown (≤1 µA quiescent current), and drives up to 8 mA - ideal for precision ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4140CCMX-1.0 datasheet, LM4140CCMX-1.0 pinout, LM4140CCMX-1.0 application, or LM4140CCMX-1.0 equivalent, key selection considerations include its sub-bandgap 1.024 V output, ultra-low noise performance, dropout voltage of 20 mV at 1 mA, SOIC-8 package compatibility, and enable-controlled power cycling for battery-sensitive systems.
Technical Context
The LM4140CCMX-1.0 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming - enabling higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports operation with VIN as low as VREF + 400 mV across 0°C to 70°C.
It implements active output capacitor discharge during shutdown, restoring VREF in <200 µs on enable. The device requires a mandatory 1 µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.024 V ±0.1% (initial accuracy at 25°C); enables precise 10-bit full-scale scaling in ADCs/DACs |
| Tempco (C Grade) | 10 ppm/°C over 0°C to 70°C; ensures ≤0.7 mV drift across industrial ambient range |
| Dropout Voltage | 20 mV (typical) at 1 mA load; allows operation from 1.8 V supply with margin for battery sag |
| Output Noise | 2.2 µVPP (0.1–10 Hz); critical for high-resolution data acquisition below 16-bit ENOB loss |
| Supply Current | 230 µA (typical, active); ≤1 µA in shutdown - extends coin-cell life in always-on sensor nodes |
| Enable Logic | Active-high enable; VIH ≥0.8×VIN, VIL ≤0.4 V; compatible with 1.8 V/3.3 V GPIO without level shift |
| Output Drive | ±8 mA sink/source capability; sufficient to directly bias SAR ADC references and op-amp inputs |
Pinout & Package
LM4140CCMX-1.0 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | Ground (GND) | Four dedicated ground connections reduce ground bounce and improve PSRR; all must be tied to system ground plane |
| 2 | VIN | Positive supply input; accepts 1.8 V to 5.5 V; requires local 0.1 µF bypass capacitor for noise suppression |
| 3 | Enable | Active-high digital control; pulling low disables output and reduces supply current to ≤1 µA |
| 5 | NC | No-connect pin; must remain unconnected and unstubbed to avoid parasitic coupling |
| 6 | VREF | Precision 1.024 V output; requires 1 µF ceramic/tantalum capacitor to GND for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 0.1% initial accuracy and 10 ppm/°C tempco without laser trimming - improves yield and long-term stability |
| Sub-bandgap output | 1.024 V option enables direct matching to 10-bit full-scale codes (210 = 1024), eliminating scaling resistors in microcontroller ADC designs |
| Active discharge on disable | Internally discharges output capacitor to ground during shutdown - prevents holdover voltage and ensures clean restart |
| Low 20-mV dropout | Permits use with single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) supplies while maintaining regulation |
| 1 µF stability guarantee | Specified stable with 1 µF output capacitor - simplifies layout vs. references requiring >10 µF or tight ESR windows |
Applications
| Portable Data Loggers | Precision Weigh Scales |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure at 16-bit resolution over 6-month deployment. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADC (e.g., ADS8860), providing stable 1.024 V full-scale reference independent of battery voltage decay. Use Value: 10 ppm/°C tempco and 2.2 µVPP noise ensure <±0.01% measurement error across 0–50°C operating range without calibration. |
Use Scenario: Industrial bench scale using strain-gauge bridge with 24-bit ΣΔ ADC (e.g., ADS1232) requiring ultra-stable excitation and reference. IC Role / Device Role / Timing Role: Dual-role reference: supplies 1.024 V to ADC reference input and biases bridge excitation via op-amp buffer. Use Value: 0.1% initial accuracy and thermal hysteresis <20 ppm eliminate need for factory zero-span recalibration after thermal cycling. |
| Medical Patient Monitors | Automotive Battery Management |
|
Use Scenario: Portable ECG module digitizing analog leads with 20-bit resolution and <1 µV RMS noise floor. IC Role / Device Role / Timing Role: Low-noise reference for precision instrumentation amplifier and ADC front-end; enabled only during sampling bursts. Use Value: Enable pin reduces average supply current to <1 µA between samples, extending AA battery life to >12 months. |
Use Scenario: 12-V automotive BMS monitoring cell voltages with 14-bit ADC under wide temperature (-40°C to 125°C ambient, 0°C to 70°C junction). IC Role / Device Role / Timing Role: Reference for isolated ADC measuring stacked lithium-ion cells; powered from local LDO with VIN = 3.3 V. Use Value: 20 mV dropout allows regulation even with LDO dropout and wiring drop, ensuring reference integrity during cold-crank transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, 50 ppm/°C max, no enable pin, 50 µA supply current | Lacks shutdown mode and sub-1.2 V options; lower accuracy limits 16-bit+ systems | Choose when enable function is unnecessary and 1.2 V matches system scaling needs |
| ADR3410ARJZ-R7 | 1.0 V output, 10 ppm/°C, enable pin, 120 µA supply current, 125 mV dropout | Higher dropout limits use with low-VIN rails; 1.0 V vs. 1.024 V requires gain adjustment in ADC interface | Prefer when lower quiescent current is critical and 1.0 V reference suffices for resolution goals |
Compared with LM4140CCMX-1.0, REF3012AIDBZR trades enable functionality and tighter initial accuracy for lower cost and smaller SOT-23 package, while ADR3410ARJZ-R7 offers comparable tempco and enable but sacrifices dropout performance and exact 1.024 V scaling - making LM4140CCMX-1.0 optimal for battery-powered, high-resolution, sub-bandgap reference applications.
Availability
LM4140CCMX-1.0 is available at Aetrix Electronics and suitable for portable instrumentation, medical sensing, and industrial data acquisition requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LM4140CCMX-1.0 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision analog ICs.
The LM4140 series was designed specifically for high-accuracy, low-power, low-noise voltage reference applications in portable, battery-operated, and industrial measurement systems - emphasizing sub-bandgap outputs and EEPROM-based trimming.
FAQ
What is the output voltage tolerance and temperature coefficient of the LM4140CCMX-1.0?
The LM4140CCMX-1.0 provides a nominal 1.024 V output with ±0.1% initial accuracy at 25°C and a temperature coefficient of 10 ppm/°C over 0°C to 70°C (C grade). This ensures total output variation remains within ±0.07% across its rated temperature range, supporting 16-bit system accuracy without calibration.
Does the LM4140CCMX-1.0 require an external output capacitor, and if so, what value and type?
Yes - the LM4140CCMX-1.0 requires a minimum 1 µF output capacitor connected between VREF and GND for loop stability and transient response. TI validates stability with surface-mount tantalum (e.g., Kemet T491A105M010AS) and ceramic capacitors meeting ESR specifications in Figures 22–24 of the datasheet.
How does the enable pin function on the LM4140CCMX-1.0, and what happens to the output during shutdown?
The LM4140CCMX-1.0 enable pin is active-high: driving it ≥0.8×VIN enables normal operation; pulling it ≤0.4 V disables the output and reduces supply current to ≤1 µA. During shutdown, internal circuitry actively discharges the output capacitor to ground, preventing voltage holdover and enabling fast, clean reactivation (<200 µs).
Can the LM4140CCMX-1.0 operate from a 1.8 V supply, and what is its minimum dropout voltage?
Yes - the LM4140CCMX-1.0 operates from 1.8 V to 5.5 V supply. Its typical dropout voltage is 20 mV at 1 mA load (25°C), rising to 45 mV over 0°C to 70°C. This allows reliable regulation even with significant supply droop, such as in single-cell Li-ion or two-cell alkaline systems.
What is the output noise specification of the LM4140CCMX-1.0, and how does it scale with output voltage?
The LM4140CCMX-1.0 delivers 2.2 µVPP (0.1–10 Hz) output noise for the 1.024 V option. Per datasheet Note 7, output noise scales linearly with VREF - so a 2.5 V variant would exhibit ~5.4 µVPP. This ultra-low noise preserves dynamic range in high-resolution data acquisition systems.
LM4140CCMX-1.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.024V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 2.2µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.8V ~ 5.5V
- Current - Supply:
- 375µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140CCMX-1.0 FAQ
1.How can I place an order for LM4140CCMX-1.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140CCMX-1.0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4140CCMX-1.0 reliable?
The price and inventory of LM4140CCMX-1.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140CCMX-1.0 is usually 5 days.
3.What payment methods are accepted for LM4140CCMX-1.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140CCMX-1.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140CCMX-1.0?
LM4140CCMX-1.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140CCMX-1.0 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4140CCMX-1.0?
For technical support, including LM4140CCMX-1.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140CCMX-1.0 requirements.
6.How does Aetrix verify that LM4140CCMX-1.0 is sourced from the original manufacturer or authorized distributors?
All LM4140CCMX-1.0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4140CCMX-1.0 meets industry standards.
7.What is the process for return or replacement of LM4140CCMX-1.0?
All LM4140CCMX-1.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140CCMX-1.0, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4140CCMX-1.0 part is unused and in its original packaging.
Return procedure for LM4140CCMX-1.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140CCMX-1.0 Tags
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