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Texas Instruments LMV981BLX
- Part No.:
- LMV981BLX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-UFBGA
- Datasheet:
-
LMV981BLX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 6USMD
- Quantity:
- Payment:
- Shipping:
Inventory:4,836
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Product details
Overview
LMV981BLX from Texas Instruments is a single-channel, rail-to-rail input/output operational amplifier optimized for 1.8-V operation, delivering 1.4-MHz gain-bandwidth product, 100-µA supply current per channel, and output swing within 80 mV of rails into 600-Ω load - enabling precision signal conditioning in ultra-low-power battery-powered systems such as fitness trackers and wearables.
For engineers reviewing the LMV981BLX datasheet, LMV981BLX pinout, LMV981BLX application, or LMV981BLX equivalent, this page provides verified technical context, real-world design implications of rail-to-rail I/O, shutdown functionality, thermal behavior in DSBGA packaging, and validated alternative options for portable analog front-end designs.
Technical Context
The LMV981BLX implements a CMOS input stage with rail-to-rail input common-mode range extending 200 mV beyond supplies and rail-to-rail output swing capable of driving 600-Ω loads while maintaining stability with up to 1000-pF capacitive loads. Its internal architecture supports single-supply operation from 1.8 V to 5 V without performance degradation.
Shutdown control is implemented via a dedicated SHDN pin that places the output in high-impedance state and reduces quiescent current to ≤1 µA; turnon time from shutdown is 19 µs at 1.8 V, 12.5 µs at 2.7 V, and 8.4 µs at 5 V - confirming fast wake-up capability critical for duty-cycled sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5 V - enables direct interface with single-cell Li-ion (3.0–4.2 V) and two-cell alkaline (2.4–3.2 V) batteries without regulation. |
| Gain-Bandwidth Product | 1.4 MHz at 1.8 V - supports stable closed-loop gain ≥10 at audio-band frequencies (≤140 kHz) in low-voltage sensor amplification. |
| Input Offset Voltage | Max 4 mV at 25°C - ensures ≤0.4% error in 1-V full-scale DC-coupled measurement paths without trimming. |
| Output Swing (600 Ω) | Within 80 mV of rails at 1.8 V - preserves >90% dynamic range in 1.8-V systems, critical for maximizing ADC utilization. |
| Supply Current (per channel) | 103 µA typical at 1.8 V - allows continuous operation for >1 year on a 200-mAh coin cell in always-on wearable monitoring. |
| Input Common-Mode Range | Extends 200 mV beyond supplies - permits accurate sensing of signals below ground or above V+ in single-supply configurations. |
| Shutdown Current | 0.156 µA typical at 25°C - reduces system standby power to nanoampere level during sleep modes. |
Pinout & Package
LMV981BLX is packaged in a 6-pin DSBGA (YZR) with 1.006 mm × 1.514 mm footprint and 0.945 mm height - optimized for space-constrained PCBs in wearables and hearing aids.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN | Noninverting input | High-impedance CMOS node accepting signals from sensors or DACs; supports rail-to-rail common-mode range. |
| −IN | Inverting input | Differential input node; used with feedback network to set closed-loop gain and bandwidth. |
| OUT | Amplifier output | Capable of sourcing/sinking ≥4 mA into 600-Ω load while maintaining rail-to-rail swing and low THD (0.023%). |
| SHDN | Active-high shutdown control | Pull high (>1 V at 1.8 V supply) to enable; pull low (<0.55 V) to disable and reduce supply current to sub-µA level. |
| V+ | Positive supply | Connects to main system rail (1.8–5 V); internal ESD protection rated to ±2000 V HBM. |
| V− | Negative supply / ground | Reference node for single-supply operation; supports true ground-referenced inputs and outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 1.8-V supply in single-ended configurations - no level-shifting required for interfacing with 1.8-V ADCs or microcontrollers. |
| Ultra-low quiescent current | 103 µA typical at 1.8 V - allows integration into energy-harvesting or coin-cell-powered nodes without compromising battery life. |
| Fast shutdown wake-up | 19 µs turnon time from shutdown at 1.8 V - supports burst-mode sensing with minimal latency penalty in motion-triggered applications. |
| Stable with capacitive loads | Drives up to 1000-pF load without oscillation - eliminates need for isolation resistors when driving long traces or ADC input capacitance. |
| Extended temperature range | Specified from −40°C to +125°C - qualified for under-hood automotive modules and industrial edge sensors requiring wide thermal margin. |
Applications
| Battery Voltage Monitoring | Wearable Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion cell voltage during charge/discharge cycles in smart bands and hearables. IC Role / Device Role / Timing Role: Precision buffer and level-shifter between battery sense resistor divider and 12-bit SAR ADC. Use Value: 80-mV rail-to-rail swing at 1.8 V ensures >95% of ADC input range is usable, improving resolution by 0.5 LSB over non-RRIO alternatives. |
Use Scenario: Amplifying weak biopotential signals (ECG, EMG) from dry electrodes in compact fitness trackers. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver with DC-coupled input and low-noise (60 nV/√Hz) performance. Use Value: 200-mV beyond-rail input common-mode range accommodates electrode offset voltages without AC coupling or bias networks. |
| Portable Audio Line Driver | Low-Power Supply Current Sensing |
|
Use Scenario: Driving stereo headphone outputs from a 1.8-V codec in Bluetooth earbuds with <1% THD+N. IC Role / Device Role / Timing Role: Output line driver configured as unity-gain buffer with 600-Ω load drive capability. Use Value: 0.023% THD at 1 kHz into 600 Ω meets Class-D audio pre-driver requirements while consuming <110 µA total. |
Use Scenario: Measuring system supply current in IoT edge nodes using high-side shunt sensing with microcontroller ADC. IC Role / Device Role / Timing Role: Current-sense amplifier with gain set by external resistors, referenced to V+ for high-side topology. Use Value: Input common-mode range up to V+ + 0.2 V allows direct connection to shunt placed between battery and PMIC input, eliminating level-shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-I/OT | Higher VOS (max 4.5 mV), lower GBW (1 MHz), no shutdown pin, SC70-5 package (no SHDN terminal). | Lacks active shutdown; unsuitable for duty-cycled systems requiring sub-µA sleep current. | Select when shutdown is unnecessary and cost sensitivity outweighs power savings. |
| TLV9001IDBVR | Lower VOS (max 1.6 mV), same GBW (1 MHz), integrated EMI filtering, SOT-23-5 (no SHDN pin). | No dedicated shutdown control; requires external logic or GPIO-driven enable circuit for power gating. | Prefer when precision offset and noise immunity are prioritized over integrated low-power control. |
Compared with MCP6001T-I/OT and TLV9001IDBVR, LMV981BLX uniquely combines guaranteed 1.8-V operation, rail-to-rail I/O, integrated shutdown, and DSBGA packaging - making it the only option among the three qualified for space- and power-constrained wearable sensor nodes requiring fast wake-up and full supply-rail utilization.
Availability
LMV981BLX is available at Aetrix Electronics and suitable for battery monitoring, wearable sensor interfaces, portable audio line driving, and low-power supply current sensing requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for LMV981BLX 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 low-power precision amplifiers and signal-chain solutions.
The LMV98x-N family was designed specifically for ultra-low-voltage, battery-operated applications - emphasizing rail-to-rail operation at 1.8 V, sub-100-µA quiescent current, and miniature packaging for next-generation wearables and portable medical devices.
FAQ
What is the maximum operating supply voltage for LMV981BLX?
The LMV981BLX supports a maximum supply voltage of 5.5 V, with recommended operation from 1.8 V to 5 V. Absolute maximum rating is specified as V+ – V− ≤ 5.5 V, and operation beyond 5 V risks permanent damage. At 5 V, LMV981BLX delivers 4.89-V positive swing and 0.12-V negative swing into 600-Ω load, maintaining rail-to-rail functionality across its full rated range.
Does LMV981BLX support true single-supply operation with input signals below ground?
Yes, LMV981BLX supports true single-supply operation with input common-mode voltage extending 200 mV below V− (i.e., down to V− − 0.2 V). This allows direct interface with transducers generating negative-going signals relative to system ground - such as piezoelectric sensors or AC-coupled microphone outputs - without external level-shifting circuitry.
What is the thermal resistance (RθJA) of LMV981BLX in its DSBGA package?
The LMV981BLX in YZR (DSBGA) package has a junction-to-ambient thermal resistance (RθJA) of 138.2°C/W, measured on a standard JEDEC 2-layer board. This value reflects its efficient heat dissipation in ultra-thin form factor - critical for reliability in sealed wearable enclosures where airflow is restricted and ambient temperatures may reach 60°C.
Can LMV981BLX drive a 1000-pF capacitive load without instability?
Yes, LMV981BLX is characterized to remain stable driving up to 1000-pF capacitive loads with minimal ringing, as confirmed in TI's SNOS976M datasheet Figure 6 (Gain/Phase vs Frequency) and Section 9.2. This eliminates the need for series isolation resistors when interfacing directly with SAR ADC input capacitance or long PCB traces in compact layouts.
How does the shutdown function behave on LMV981BLX?
The LMV981BLX enters shutdown when the SHDN pin is pulled low (<0.55 V at 1.8 V supply), reducing supply current to ≤1 µA and placing the output in high-impedance state. It exits shutdown when SHDN rises above the turnon threshold (1 V at 1.8 V), with 19-µs propagation delay to valid output - enabling precise timing control in microcontroller-managed power sequencing.
LMV981BLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-UFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.42V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 14 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 116µA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µSMD (1.01x1.51)
LMV981BLX FAQ
1.How can I place an order for LMV981BLX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV981BLX 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 LMV981BLX reliable?
The price and inventory of LMV981BLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV981BLX is usually 5 days.
3.What payment methods are accepted for LMV981BLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV981BLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV981BLX?
LMV981BLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV981BLX 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 LMV981BLX?
For technical support, including LMV981BLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV981BLX requirements.
6.How does Aetrix verify that LMV981BLX is sourced from the original manufacturer or authorized distributors?
All LMV981BLX 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 LMV981BLX meets industry standards.
7.What is the process for return or replacement of LMV981BLX?
All LMV981BLX units undergo pre-shipment inspection (PSI). If there is an issue with LMV981BLX, 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 LMV981BLX part is unused and in its original packaging.
Return procedure for LMV981BLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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