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Texas Instruments LMV797MMX
- Part No.:
- LMV797MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMV797MMX.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
LMV797MMX from Texas Instruments is a dual-channel, low-noise, CMOS-input operational amplifier optimized for low-voltage, high-fidelity signal conditioning. It delivers 5.8 nV/√Hz input voltage noise density, 17 MHz unity-gain bandwidth, and rail-to-rail output swing within a 1.8 V to 5.5 V supply range - enabling precision photodiode amplification and sensor interface in battery-powered medical and automotive systems.
For engineers reviewing the LMV797MMX datasheet, LMV797MMX pinout, LMV797MMX application, or LMV797MMX equivalent, this page provides verified technical context, package-validated pin functions, real-world application cards, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LMV797MMX employs a CMOS input stage with 100 fA typical input bias current and 0.01 pA/√Hz input current noise, supporting ground-sensing single-supply operation down to 1.8 V. Its 17 MHz gain-bandwidth product and 9.5 V/μs slew rate (at 5 V) enable stable unity-gain configurations driving 600 Ω loads with ≤0.01% THD+N at 1 kHz.
It features rail-to-rail output capable of sourcing ≥45 mA and sinking ≥37 mA (at 5 V), with output swing limited to 25 mV from either rail into 10 kΩ and 45 mV into 2 kΩ. The device is unity-gain stable and tolerates up to 120 pF capacitive load without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 5.8 nV/√Hz at 1 kHz - enables high-SNR amplification of weak sensor signals without adding measurable noise floor |
| Unity-Gain Bandwidth | 17 MHz - supports wideband active filtering and audio preamplification up to ~10 MHz closed-loop |
| Supply Voltage Range | 1.8 V to 5.5 V - compatible with Li-ion, coin-cell, and 3.3 V/5 V system rails without level-shifting |
| Rail-to-Rail Output Swing | 25 mV from rail into 10 kΩ - maximizes dynamic range in low-voltage systems (e.g., 2.5 V supply yields >2.45 Vpp output) |
| Input Bias Current | 100 fA typical - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces |
| THD+N | 0.01% at 1 kHz, 600 Ω - meets fidelity requirements for clinical-grade biomedical instrumentation |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
Pinout & Package
LMV797MMX is housed in an 8-pin VSSOP (DGK) package - 2.3 mm × 2.0 mm footprint with 0.5 mm pitch - optimized for space-constrained portable and automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Channel A output | Delivers rail-to-rail amplified signal; capable of sourcing ≥45 mA into 2 kΩ at 5 V |
| 2 (−IN A) | Inverting input A | High-impedance CMOS node; accepts differential or single-ended inputs down to V− (ground) |
| 3 (+IN A) | Non-inverting input A | Common-mode range includes V−; enables true ground-referenced sensing in single-supply designs |
| 4 (V−) | Negative supply / ground | Reference for both channels; must be connected directly to low-impedance ground plane |
| 5 (+IN B) | Non-inverting input B | Independent high-Z input for second channel; shares same V− reference as Channel A |
| 6 (−IN B) | Inverting input B | Supports dual-channel transimpedance or differential buffer configurations |
| 7 (OUT B) | Channel B output | Electrically identical to OUT A; enables independent dual-path signal conditioning |
| 8 (V+) | Positive supply | Accepts 1.8–5.5 V; quiescent current per channel is 1.30 mA at 5 V |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise CMOS input | 5.8 nV/√Hz voltage noise + 0.01 pA/√Hz current noise enables sub-nA photodiode current detection |
| Rail-to-rail output drive | Sources ≥45 mA and sinks ≥37 mA at 5 V - drives 600 Ω loads directly without external buffers |
| Wide supply range | Operates from 1.8 V (0°C to 125°C) to 5.5 V - extends usable battery life in portable medical devices |
| Unity-gain stability | Stable with capacitive loads up to 120 pF - eliminates need for external isolation resistors in most sensor interfaces |
| Automotive-ready thermal range | Specified from −40°C to +125°C - suitable for engine control, ADAS camera front-ends, and cabin sensors |
Applications
| Photodiode Amplifier | Medical ECG Front-End |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon photodiodes in pulse oximetry modules. IC Role / Device Role / Timing Role: Transimpedance amplifier converting IPHOTO to VOUT with minimal added noise and maximal bandwidth. Use Value: 5.8 nV/√Hz noise density and 100 fA bias current preserve SNR across 0.5–10 Hz physiological band; 17 MHz GBW supports fast LED modulation schemes. |
Use Scenario: Conditioning low-amplitude, high-impedance biopotential signals from dry-electrode ECG leads. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with rail-to-rail swing and ground-sensing capability. Use Value: Input common-mode range including V− allows direct connection to electrode nodes referenced to patient ground; 0.01% THD+N ensures diagnostic-grade waveform fidelity. |
| Automotive Cabin Sensor Hub | Portable Gas Analyzer Signal Chain |
Use Scenario: Simultaneous amplification of CO₂, humidity, and temperature sensor outputs in HVAC control units. IC Role / Device Role / Timing Role: Dual-channel general-purpose op amp providing gain, filtering, and level-shifting for mixed analog inputs. Use Value: −40°C to +125°C operation ensures reliability in dashboard-mounted units; 1.8 V minimum supply supports energy harvesting power sources. |
Use Scenario: Low-power signal conditioning for electrochemical gas sensors requiring ultra-low input current injection. IC Role / Device Role / Timing Role: High-impedance voltage follower and programmable-gain stage preceding ADC sampling. Use Value: 100 fA input bias current prevents sensor polarization drift; 1.30 mA per channel quiescent current enables >100-hour battery life in handheld analyzers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, dual-channel op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2376AIDGKR | Lower input voltage noise (4.2 nV/√Hz), higher supply current (750 μA/channel), no 1.8 V operation | Better for ultra-low-noise audio; unsuitable for sub-2 V battery systems | Select when noise dominates over power; avoid if operating below 2.0 V or requiring <1.1 mA/channel |
| ADA4897-2ARMZ | Higher bandwidth (225 MHz), higher noise (7.9 nV/√Hz), 3 V minimum supply, ±2.5 V dual supply only | Targeted at high-speed data acquisition, not low-voltage sensor interfaces | Choose for >100 MHz closed-loop designs; reject for single-supply, low-voltage, or battery-operated use cases |
Compared with OPA2376AIDGKR and ADA4897-2ARMZ, the LMV797MMX uniquely balances 5.8 nV/√Hz noise, 1.8 V operation, and 1.30 mA/channel supply current - making it the only option among the three viable for long-life, ground-sensing, single-supply sensor nodes below 2.5 V.
Availability
LMV797MMX is available at Aetrix Electronics and suitable for photodiode amplifiers, medical ECG front-ends, and automotive cabin sensor hubs requiring stable component supply across extended temperature ranges and low-voltage operation.
Supply support for LMV797MMX 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 precision op amps and low-power signal chains.
The LMV797MMX belongs to TI's LMV796/LMV797 family - engineered specifically for low-noise, low-voltage sensor interface applications where rail-to-rail output, femtoampere input bias, and 17 MHz bandwidth are simultaneously required.
FAQ
What is the maximum capacitive load the LMV797MMX can drive without instability?
The LMV797MMX is unity-gain stable and can directly drive up to 120 pF capacitive load without oscillation or excessive overshoot. This specification is validated per TI's SNOSAU9D datasheet Figure 39 and Figure 40 (Phase Margin vs. Capacitive Load). For loads exceeding 120 pF, an isolation resistor (RISO) between the LMV797MMX output and the load is recommended to maintain ≥30° phase margin. The LMV797MMX's robust capacitive drive capability simplifies layout in photodiode and cable-driven applications where stray capacitance is unavoidable.
Does the LMV797MMX support true ground-referenced input in single-supply operation?
Yes - the LMV797MMX features an input common-mode voltage range that includes the negative supply rail (V−), allowing direct connection of sensors referenced to ground in single-supply configurations. Per the datasheet's Electrical Characteristics table, the common-mode voltage range extends to −0.3 V (with CMRR ≥55 dB) at 5 V supply, and to 0 V with full CMRR performance. This enables accurate amplification of signals from bridge sensors, thermocouples, or biopotential electrodes without level-shifting circuitry - a key advantage of the LMV797MMX in medical and industrial sensor interfaces.
What is the guaranteed minimum open-loop voltage gain of the LMV797MMX at 125°C?
The LMV797MMX guarantees a minimum open-loop voltage gain (AVOL) of 78 dB at TA = 125°C, V+ = 5 V, RLOAD = 10 kΩ, and VOUT = 0.3 V to 4.7 V. This value is specified in the "5V Electrical Characteristics" table on page 4 of the SNOSAU9D datasheet. At 25°C, the typical AVOL is 98 dB, confirming strong loop gain retention across temperature - critical for maintaining accuracy in precision gain stages and active filters operating in hot environments such as automotive engine compartments.
Can the LMV797MMX be used as a comparator?
No - the LMV797MMX is not designed or characterized for open-loop comparator operation. TI explicitly advises against using the LMV797MMX as a comparator due to its internal positive feedback scheme that boosts output current drive but compromises open-loop response predictability. The datasheet Application Information section states: "This also limits the performance of the LMV796 family as comparators, and hence the usage of the LMV797MMX in an open-loop configuration is not recommended." For comparator functions, TI recommends dedicated devices such as the TLV3501 or LMV7215.
What is the input referred current noise density of the LMV797MMX at 1 kHz?
The LMV797MMX has an input referred current noise density of 0.01 pA/√Hz at 1 kHz, as specified in both the 2.5 V and 5 V Electrical Characteristics tables (pages 3 and 5 of SNOSAU9D). This ultra-low current noise - combined with its 100 fA input bias current - makes the LMV797MMX exceptionally well-suited for high-impedance current-to-voltage conversion, especially in photodiode and ion-selective electrode applications where minimizing noise contribution from the amplifier is essential to preserving signal integrity in the LMV797MMX-based signal chain.
LMV797MMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMV®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 11.5V/µs
- Gain Bandwidth Product:
- 17 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.3mA (x2 Channels)
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMV797MMX FAQ
1.How can I place an order for LMV797MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV797MMX 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 LMV797MMX reliable?
The price and inventory of LMV797MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV797MMX is usually 5 days.
3.What payment methods are accepted for LMV797MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV797MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV797MMX?
LMV797MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV797MMX 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 LMV797MMX?
For technical support, including LMV797MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV797MMX requirements.
6.How does Aetrix verify that LMV797MMX is sourced from the original manufacturer or authorized distributors?
All LMV797MMX 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 LMV797MMX meets industry standards.
7.What is the process for return or replacement of LMV797MMX?
All LMV797MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMV797MMX, 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 LMV797MMX part is unused and in its original packaging.
Return procedure for LMV797MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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