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Texas Instruments LMH6523SQ/NOPB
- Part No.:
- LMH6523SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Amplifiers
- Package:
- 54-WFQFN Exposed Pad
- Datasheet:
-
LMH6523SQ/NOPB.pdf
- Description:
- IC OPAMP VGA 4 CIRCUIT 54WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,517
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Product details
Overview
LMH6523SQ/NOPB from Texas Instruments is a quad-channel, digitally controlled variable gain amplifier (DVGA) with independent 1 dB gain steps over 31 dB range, −3 dB bandwidth of 1.4 GHz, OIP3 of 49 dBm at 200 MHz, and differential 100 Ω input / 20 Ω output impedance. It drives high-performance ADCs in wideband IF sampling receivers for cellular base stations.
For engineers reviewing the LMH6523SQ/NOPB datasheet, LMH6523SQ/NOPB pinout, LMH6523SQ/NOPB application, or LMH6523SQ/NOPB equivalent, key selection criteria include per-channel enable control (High/Low Power/Shutdown), SPI or parallel digital interface, gain step accuracy (±0.1 dB over 0–23 dB), thermal performance (θJA = 23 °C/W), and 54-pin WQFN package compatibility with high-density RF layouts.
Technical Context
The LMH6523SQ/NOPB integrates four independent DVGA channels, each comprising a 5-bit digitally controlled attenuator (0–31 dB) followed by a fixed 26 dB differential-output amplifier. Gain control supports both serial (SPI-compatible) and parallel modes via MODE pin selection.
Each channel features three-state enable logic (0.0–0.4 V = shutdown, 0.6–1.9 V = Low Power Mode, ≥2.2 V = High Power Mode), self-biasing enable pins, and channel-to-channel crosstalk <−65 dBc at 200 MHz. The architecture targets automatic gain control (AGC) loops requiring fast settling (20 ns gain step, 200 ns enable/disable) and stable linearity across temperature (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OIP3 | 49 dBm at 200 MHz - enables high-dynamic-range signal chain operation before ADC saturation |
| −3 dB Bandwidth | 1.4 GHz - supports wideband IF sampling up to 400 MHz fundamental frequency |
| Noise Figure | 8.5 dB at 100 Ω source - balances low-noise front-end amplification with high-linearity gain control |
| Gain Range | +25.74 dB to −4.3 dB in 1 dB steps - provides precise AGC resolution for mixed-signal receiver calibration |
| Input Impedance | 97 Ω differential - matches standard 100 Ω RF filter and mixer interfaces without external termination |
| Output Impedance | 20 Ω differential - allows direct drive of 200 Ω ADC inputs or matched filter loads with minimal reflection |
| Supply Current | 485 mA typical (High Power Mode), 398 mA (Low Power Mode) - enables power-scalable system-level thermal management |
Pinout & Package
LMH6523SQ/NOPB is housed in a thermally enhanced 54-pin WQFN package (10 mm × 5.5 mm × 0.8 mm, 0.5 mm pitch) with exposed thermal pad bonded to ground. Pin layout supports symmetrical analog I/O routing and dedicated power/ground distribution for RF isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA+/INA−, INB+/INB−, INC+/INC−, IND+/IND− | Differential Analog Inputs | Four independent 100 Ω differential input pairs, self-biased to 2.5 V, AC-coupled compatible |
| OUTA+/OUTA−, OUTB+/OUTB−, OUTC+/OUTC−, OUTD+/OUTD− | Differential Analog Outputs | Four low-impedance (20 Ω) differential outputs supporting up to 10 VPPD swing on single 5 V supply |
| +5VA, +5VB, +5VC, +5VD | Channel-Specific Power Supplies | Independent 4.75–5.25 V supply pins per channel reduce inter-channel supply coupling and improve PSRR |
| ENBA, ENBB, ENBC, ENBD | Per-Channel Enable Inputs | Three-state logic control: shutdown (<0.4 V), Low Power Mode (0.6–1.9 V), High Power Mode (≥2.2 V) |
| MODE, A0–A4, B0–B4, C0–C4, D0–D4 | Digital Control Interface | MODE selects parallel (logic low) or serial (logic high); A0–A4 etc. are 5-bit attenuation codes per channel |
| GND (Pins 1,4,6,9,10,13–15,18,31,33,40,42) | Ground Terminals | 14 dedicated ground pins + exposed thermal pad ensure low-inductance return path for all analog/digital domains |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel power mode control | Independent High Power / Low Power / Shutdown states enable dynamic power scaling per signal path segment |
| 1 dB gain step accuracy | ±0.1 dB error over 0–23 dB attenuation range ensures precise AGC loop convergence and channel matching |
| Differential input/output architecture | 97 Ω input / 20 Ω output impedances simplify interface to 100 Ω filters and 200 Ω ADCs without external matching networks |
| Fast gain switching | 20 ns settling time between adjacent 1 dB steps minimizes transient distortion during rapid gain updates |
| Channel isolation | −65 dBc crosstalk at 200 MHz enables simultaneous multi-band IF processing without inter-channel interference |
Applications
| Cellular Base Station Receiver | Wideband Direct Conversion Transceiver |
|---|---|
Use Scenario: Multi-carrier LTE/FDD-TDD base station front-end with dynamic signal level variation exceeding 60 dB. IC Role / Device Role / Timing Role: Quad-channel DVGA provides per-RF-path AGC before quadrature demodulation and ADC sampling. Use Value: 31 dB per-channel gain range + 49 dBm OIP3 maintains SNR >75 dB across full input dynamic range while enabling cascaded channel use for 62 dB total range. | Use Scenario: Software-defined radio (SDR) transceiver supporting 20–500 MHz instantaneous bandwidth with real-time gain adaptation. IC Role / Device Role / Timing Role: Differential DVGA conditions IF signals prior to high-speed ADC (≥125 MSPS) with minimal phase distortion. Use Value: ±0.1° gain-step phase shift and 1.4 GHz bandwidth preserve wideband signal integrity and EVM compliance under fast AGC transitions. |
| ADC Driver for Wideband IF Sampling | Multi-Channel Spectrum Analyzer Front-End |
Use Scenario: 16-bit, 250 MSPS ADC driving in high-fidelity instrumentation requiring >90 dB SFDR. IC Role / Device Role / Timing Role: Final-stage gain control and driver delivering 10 VPPD differential swing into 200 Ω load. Use Value: 20 Ω output impedance enables precise 40.2 Ω series termination to match 100 Ω differential filter, minimizing reflections and maintaining >75 dB SFDR up to 200 MHz. | Use Scenario: Real-time spectrum analysis with simultaneous multi-channel FFT processing across 100+ MHz span. IC Role / Device Role / Timing Role: Four independent DVGAs condition parallel IF paths from downconversion mixers before digitization. Use Value: Channel-to-channel gain matching ±0.15 dB and <−65 dBc crosstalk ensure amplitude coherence across FFT bins, reducing measurement uncertainty below ±0.2 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5330ACPZ-R7 | Single-channel, 0–30 dB range, 2.5 GHz bandwidth, requires external op-amp for differential output | Lacks integrated differential output stage and quad-channel integration; suited for discrete high-frequency gain blocks | Select when >2 GHz bandwidth is required and board space permits external output conditioning |
| MAX19707ETX+ | Quad-channel, 0–31.5 dB range, 1.2 GHz bandwidth, 3.3 V supply, lower OIP3 (42 dBm @ 200 MHz) | Lower supply voltage and linearity; optimized for portable battery-powered systems rather than infrastructure-grade linearity | Select when 3.3 V operation and reduced power (320 mA) outweigh 7 dB OIP3 penalty in cost-sensitive designs |
Compared with ADL5330ACPZ-R7 and MAX19707ETX+, LMH6523SQ/NOPB delivers superior per-channel linearity (49 dBm OIP3), native differential I/O, and thermal efficiency (23 °C/W) essential for densely packed cellular infrastructure and test equipment where signal fidelity and channel density are critical.
Availability
LMH6523SQ/NOPB is available at Aetrix Electronics and suitable for cellular base station receivers, wideband IF sampling systems, and high-speed ADC driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and telecom deployments.
Supply support for LMH6523SQ/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 LMH6523SQ/NOPB belongs to TI's high-speed amplifier portfolio, designed specifically for wideband IF sampling, automatic gain control, and precision ADC driver applications demanding ultra-low distortion and digitally programmable gain in compact form factors.
FAQ
What is the maximum operating frequency range supported by the LMH6523SQ/NOPB?
The LMH6523SQ/NOPB supports signal frequencies up to 400 MHz with specified performance, including −3 dB bandwidth of 1.4 GHz and OIP3 characterization up to 500 MHz. At 200 MHz, it delivers 49 dBm OIP3 and 8.5 dB noise figure under High Power Mode with 5 V supply and 200 Ω load. Performance remains functional beyond 400 MHz but with gradually reduced linearity and gain flatness.
How does the LMH6523SQ/NOPB handle power management across its four channels?
The LMH6523SQ/NOPB implements per-channel power control via four dedicated enable pins (ENBA–ENBD). Each pin accepts three voltage levels: <0.4 V (shutdown, 74 mA total ICC), 0.6–1.9 V (Low Power Mode, 398 mA total), or ≥2.2 V (High Power Mode, 485 mA total). This allows independent optimization of linearity vs. power per signal path without affecting other channels.
Can the LMH6523SQ/NOPB be used with a 3.3 V supply?
No - the LMH6523SQ/NOPB is specified only for 4.75 V to 5.25 V operation. Absolute maximum ratings prohibit operation below 4.75 V, and electrical characteristics (OIP3, gain, noise figure) are guaranteed only within this range. Attempting 3.3 V operation will result in undefined behavior, degraded linearity, and potential failure to meet datasheet specifications.
What is the significance of the 54-pin WQFN package's exposed thermal pad for LMH6523SQ/NOPB?
The exposed thermal pad on the LMH6523SQ/NOPB's 54-pin WQFN package is internally bonded to all GND pins and must be soldered to a low-impedance PCB ground plane. It reduces junction-to-ambient thermal resistance to θJA = 23 °C/W, enabling reliable operation at full 485 mA supply current across −40°C to +85°C ambient. Omitting thermal pad connection risks thermal runaway and parametric drift.
Does the LMH6523SQ/NOPB require external biasing components for DC-coupled operation?
No - the LMH6523SQ/NOPB features self-biased differential inputs (VICM = 2.5 V) and is designed exclusively for AC-coupled operation. Its internal bias network and output stage require external 0.01 µF AC-coupling capacitors and bias inductors (e.g., 1 µH) on all inputs and outputs. DC coupling is not supported and would violate absolute maximum ratings for input voltage range.
LMH6523SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 54-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Variable Gain Amplifier
- Applications:
- Driver, Cellular Base Stations
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 54-WQFN (10x5.5)
LMH6523SQ/NOPB FAQ
1.How can I place an order for LMH6523SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6523SQ/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 LMH6523SQ/NOPB reliable?
The price and inventory of LMH6523SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6523SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6523SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6523SQ/NOPB transactions.
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4.How is shipping managed for LMH6523SQ/NOPB?
LMH6523SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6523SQ/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 LMH6523SQ/NOPB?
For technical support, including LMH6523SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6523SQ/NOPB requirements.
6.How does Aetrix verify that LMH6523SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6523SQ/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 LMH6523SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6523SQ/NOPB?
All LMH6523SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6523SQ/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 LMH6523SQ/NOPB part is unused and in its original packaging.
Return procedure for LMH6523SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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