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Texas Instruments LMH6881SQE/NOPB
- Part No.:
- LMH6881SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMH6881SQE/NOPB.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:284
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Product details
Overview
LMH6881SQE/NOPB from Texas Instruments is a DC–2.4-GHz programmable differential amplifier optimized for high-linearity signal conditioning in RF/IF and high-speed data acquisition systems. It delivers 26 dB to 6 dB voltage gain in 0.25-dB steps, 44 dBm OIP3 at 100 MHz, 9.7 dB noise figure, and 100 Ω differential input impedance - enabling direct interfacing with mixers, filters, and ADCs in spectrum analyzers and oscilloscope front ends.
For engineers reviewing the LMH6881SQE/NOPB datasheet, LMH6881SQE/NOPB pinout, LMH6881SQE/NOPB application, or LMH6881SQE/NOPB equivalent, key selection criteria include its digitally programmable gain range, dual parallel/SPI control interface, shutdown capability, thermal performance in WQFN-24, and compatibility with both differential (100 Ω) and single-ended (50 Ω) sources without external resistors.
Technical Context
The LMH6881SQE/NOPB integrates a low-noise amplifier, digitally controlled attenuator, and low-distortion output stage - enabling consistent OIP3 and noise figure across its full 20-dB gain range. Its architecture supports DC-coupled operation and maintains < ±0.125 dB gain step error and ±3° phase shift between adjacent steps.
Gain is set via parallel 4-bit logic (2-dB steps) or SPI-compatible serial interface (0.25-dB steps), with independent shutdown (SD pin) and output common-mode control (OCM pin, gain = 2). Input impedance is 100 Ω differential or 50 Ω single-ended; output impedance is < 0.5 Ω differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 2.4 GHz - supports wideband RF/IF signal paths up to 2.4 GHz without roll-off |
| OIP3 @ 100 MHz | 44 dBm - enables high dynamic range in multi-tone applications like spectrum analysis |
| Noise Figure | 9.7 dB - preserves SNR in low-level signal amplification before ADCs |
| Voltage Gain Range | 6 dB to 26 dB - covers gain requirements for variable-sensitivity front ends |
| Gain Step Size | 0.25 dB (SPI) / 2 dB (parallel) - allows precise AGC tuning or fixed-gain configuration |
| Input Impedance | 100 Ω differential or 50 Ω single-ended - matches standard RF sources and simplifies PCB layout |
| Supply Voltage | 4.75 V to 5.25 V - compatible with standard 5-V analog rails and tolerant of ±2.5% variation |
Pinout & Package
The LMH6881SQE/NOPB is housed in a thermally enhanced 24-pin WQFN package (4.00 mm × 4.00 mm) with an exposed thermal pad bonded to ground. Pin assignment follows TI's RTW footprint and supports both surface-mount reflow and manual probing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPD / INMD | Differential Analog Input | 100 Ω matched pair for balanced RF/IF signals; self-biased common-mode at 2.5 V |
| INPS / INMS | Single-Ended Analog Input | 50 Ω inputs accepting unbalanced sources; unused pin must be terminated to 50 Ω |
| OUTP / OUTM | Differential Analog Output | Low-impedance (≤0.4 Ω), fully differential outputs driving ADCs or cables directly |
| OCM | Output Common-Mode Control | Gain-of-2 input setting output common-mode voltage (e.g., 1.25 V → 2.5 V) |
| SD | Digital Shutdown | Active-high logic disables amplifier core, reducing supply current from 135 mA to 15 mA |
| SPI, D0–D3 | Digital Gain Control | Selects parallel (SPI = 0) or SPI mode (SPI = 1); D0/D1/D2/D3 configure gain or serve as SDI/SDO/CLK/CS |
| VCC (Pins 19,20,23,24) | Power Supply | Four dedicated 5-V supply pins minimize IR drop and improve PSRR |
| GND (Pins 6,7,12,13) | Ground | Four ground pins + exposed thermal pad ensure low-inductance return path and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Architecture | Monolithic integration of LNA + digital attenuator + output driver eliminates external gain-setting resistors and ensures stable performance across all 80 gain states |
| Dual Control Interface | Parallel mode enables fixed-gain solder-down designs; SPI mode supports dynamic AGC with 0.25-dB resolution and minimal pin count |
| DC-Coupled Operation | Supports baseband and IF signals down to 0 Hz - critical for pulse, medical imaging, and time-domain applications |
| Thermal-Enhanced WQFN | 4×4 mm package with exposed pad achieves θJA = 38.1°C/W - sustains full performance at 85°C ambient without heatsink |
| Input Flexibility | Simultaneous support for 100 Ω differential and 50 Ω single-ended inputs reduces BOM count and design iterations |
Applications
| Oscilloscope Front End | Spectrum Analyzer Gain Block |
|---|---|
Use Scenario: Amplifying low-amplitude, wideband transient signals from passive probes or active differential probes before digitization. IC Role / Device Role / Timing Role: Programmable differential amplifier providing adjustable gain and 2.4-GHz bandwidth to preserve rise time and harmonic content. Use Value: Enables real-time capture of fast edges (e.g., >100 ps) while maintaining SNR across varying input levels via 0.25-dB gain steps. | Use Scenario: Boosting weak RF signals from preselectors/mixers prior to digitization or detection in benchtop and portable analyzers. IC Role / Device Role / Timing Role: High-linearity gain block delivering 44 dBm OIP3 and 9.7 dB NF to maximize spurious-free dynamic range (SFDR). Use Value: Reduces measurement floor and improves third-order intermodulation visibility - critical for EMI debugging and spectral purity validation. |
| Differential ADC Driver | Medical Imaging Signal Chain |
Use Scenario: Driving high-resolution, wideband differential ADCs (e.g., 16-bit, 125 MSPS+) in communications test equipment and radar receivers. IC Role / Device Role / Timing Role: Low-output-impedance (≤0.4 Ω), DC-coupled driver ensuring flat frequency response and minimal settling error into capacitive ADC inputs. Use Value: Maintains ENOB across full Nyquist band by minimizing harmonic distortion (HD3 = −100 dBc at 100 MHz) and preserving phase matching. | Use Scenario: Conditioning ultrasound receive-path signals from transducer arrays in portable and cart-based imaging systems. IC Role / Device Role / Timing Role: Variable-gain amplifier supporting time-gain compensation (TGC) with precise 0.25-dB steps and low noise for weak echo amplification. Use Value: Improves image contrast resolution by enabling fine-grained gain adjustment per depth layer without degrading SNR or introducing switching artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6882RTWT | Dual-channel version in same WQFN-24 package; shares identical gain range, OIP3 (44 dBm), and noise figure (9.7 dB) but doubles channel count | Required when two synchronized, matched gain paths are needed (e.g., I/Q demodulation, stereo ultrasound) | Select LMH6882RTWT only if dual-channel functionality is essential; otherwise LMH6881SQE/NOPB offers lower cost and power per channel |
| ADL5562ACPZ-R7 | Fixed-gain (16 dB) differential amplifier; higher bandwidth (4.3 GHz), slightly better OIP3 (45 dBm), but no programmability or shutdown | Suitable for static-gain, ultra-wideband applications where gain flexibility is unnecessary and layout simplicity is prioritized | Choose ADL5562ACPZ-R7 only for fixed-gain, high-frequency (>2.4 GHz) paths; LMH6881SQE/NOPB remains superior for AGC, TGC, or multi-configurable systems |
Compared with LMH6882RTWT and ADL5562ACPZ-R7, the LMH6881SQE/NOPB uniquely balances programmability, linearity, and thermal efficiency in a single-channel WQFN - making it optimal for space-constrained, dynamically configurable RF front ends where gain agility and DC coupling are mandatory.
Availability
LMH6881SQE/NOPB is available at Aetrix Electronics and suitable for spectrum analyzer gain blocks, oscilloscope front ends, and differential ADC driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMH6881SQE/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 high-performance signal chain solutions for industrial, automotive, and communications markets.
The LMH6881SQE/NOPB belongs to TI's high-speed differential amplifier product line, engineered specifically for wideband, high-linearity, programmable gain applications in test & measurement, medical imaging, and communications infrastructure.
FAQ
What is the maximum operating frequency of the LMH6881SQE/NOPB?
The LMH6881SQE/NOPB has a small-signal bandwidth of 2.4 GHz, verified at 25°C with VCC = 5 V and RL = 200 Ω. This bandwidth supports full-power operation up to at least 2.4 GHz for differential signals, making it suitable for RF/IF gain blocks and high-speed data acquisition front ends where wideband fidelity is required. Performance remains usable beyond 2.4 GHz with gradual roll-off.
Does the LMH6881SQE/NOPB support both differential and single-ended inputs?
Yes, the LMH6881SQE/NOPB supports both configurations: differential inputs (INPD/INMD) present a 100 Ω impedance, while single-ended inputs (INPS/INMS) accept 50 Ω sources - with the unused input terminated to 50 Ω. This dual-input capability eliminates the need for external baluns or matching networks in mixed-signal systems, simplifying design and improving layout robustness.
How does gain control work on the LMH6881SQE/NOPB?
The LMH6881SQE/NOPB offers two gain control modes: parallel (via D0–D3 pins with SPI = 0) provides 2-dB steps across 10 states, while SPI mode (SPI = 1) enables 0.25-dB resolution across 80 states using SDI/SDO/CLK/CS. Both interfaces retain gain state during shutdown, and gain step error is tightly controlled at ±0.125 dB over the full range - ensuring predictable, repeatable signal scaling.
What is the purpose of the OCM pin on the LMH6881SQE/NOPB?
OCM (Output Common-Mode) is a dedicated input pin with gain = 2 that sets the differential output common-mode voltage. Applying 1.25 V to OCM produces a 2.5 V common-mode level at OUTP/OUTM - matching typical ADC reference voltages. This eliminates external level-shifting circuitry and ensures DC-coupled compatibility with modern pipeline and sigma-delta ADCs requiring precise common-mode alignment.
Can the LMH6881SQE/NOPB be used in DC-coupled applications?
Yes, the LMH6881SQE/NOPB supports true DC-coupled operation across its full gain range. Its internal biasing allows baseband signal amplification from 0 Hz, making it suitable for time-domain applications such as pulse amplification in ultrasound, TDR systems, and precision instrumentation - unlike AC-coupled alternatives that require external blocking capacitors and suffer from low-frequency droop.
LMH6881SQE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2.4 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 100mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LMH6881SQE/NOPB FAQ
1.How can I place an order for LMH6881SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6881SQE/NOPB 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 LMH6881SQE/NOPB reliable?
The price and inventory of LMH6881SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6881SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6881SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6881SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6881SQE/NOPB?
LMH6881SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6881SQE/NOPB 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 LMH6881SQE/NOPB?
For technical support, including LMH6881SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6881SQE/NOPB requirements.
6.How does Aetrix verify that LMH6881SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6881SQE/NOPB 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 LMH6881SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6881SQE/NOPB?
All LMH6881SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6881SQE/NOPB, 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 LMH6881SQE/NOPB part is unused and in its original packaging.
Return procedure for LMH6881SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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