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Texas Instruments LMH6514SQ/NOPB
- Part No.:
- LMH6514SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LMH6514SQ/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
LMH6514SQ/NOPB from Texas Instruments is a 600 MHz digitally controlled variable gain amplifier (DVGA) with precise 6.02 dB gain steps, 42 dB total gain range, and fully differential signal path. It features 200 Ω input impedance, selectable 200 Ω or 400 Ω output load configuration, and drives high-performance ADCs in IF sampling receivers and cellular base stations.
For engineers reviewing the LMH6514SQ/NOPB datasheet, LMH6514SQ/NOPB pinout, LMH6514SQ/NOPB application, or LMH6514SQ/NOPB equivalent, key selection criteria include gain step accuracy (±0.07 dB at 150 MHz), 5 ns gain switching time, 39 dBm OIP3 at 75 MHz, 8.3 dB noise figure, and WQFN-16 thermal performance (θJA = 47°C/W).
Technical Context
The LMH6514SQ/NOPB integrates a digitally controlled 7-step attenuator (0 to −42 dB) followed by a high-linearity transconductor stage (0.1 A/V). Its open-collector differential outputs require external biasing via RF chokes or inductors to set common-mode voltage and enable full 5.6 VPP differential swing.
Gain is set via parallel 3-bit logic (GAIN_0–GAIN_2) with latch-controlled update timing; digital inputs are 3.3 V CMOS-compatible. The internal architecture supports both single-ended and differential analog inputs while maintaining terminated 200 Ω input impedance and user-selectable output loading for gain/output impedance trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 600 MHz at 100 Ω load - enables wideband IF signal conditioning up to cellular LTE and WiMAX frequencies. |
| OIP3 | 39 dBm at 75 MHz, 200 Ω load - ensures high linearity for multi-carrier RF receiver front-ends. |
| Noise Figure | 8.3 dB at maximum gain - preserves SNR when driving 14-bit ADCs like ADC14155 in sensitive receivers. |
| Gain Range | −12.75 dB to +30.3 dB - covers dynamic range extension from weak signal amplification to strong signal attenuation. |
| Gain Step Accuracy | ±0.07 dB at 150 MHz - guarantees predictable AGC loop behavior without calibration per gain state. |
| Supply Current | 107–124 mA at 5 V - supports thermally constrained WQFN-16 layouts with 47°C/W junction-to-ambient thermal resistance. |
| Switching Time | 5 ns gain step transition - allows fast AGC response in burst-mode or TDD systems. |
Pinout & Package
LMH6514SQ/NOPB uses a 4 mm × 4 mm, 16-pin thermally enhanced WQFN package with exposed thermal pad (GND-connected). Pin 1 is top-left corner (marked dot); pin numbering follows standard counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− (Pins 6, 7) | Differential analog inputs | Internally biased to 1.4 V; 200 Ω differential input impedance; AC-coupled operation recommended. |
| OUT+, OUT− (Pins 14, 15) | Open-collector differential outputs | Require external 5 V bias via RF choke; support 5.6 VPP swing with 5 V common mode. |
| LOAD+, LOAD− (Pins 13, 16) | Internal load resistor taps | Shorting LOAD+ to LOAD− selects 200 Ω output load (lower gain, higher bandwidth); floating enables 400 Ω mode (higher gain, lower bandwidth). |
| GAIN_0–GAIN_2 (Pins 9–11) | Parallel digital gain control | 3-bit binary input defining gain step (0–7); each bit contributes 6.02 dB (GAIN_0 = 6.02 dB, GAIN_2 = 24.08 dB). |
| LATCH (Pin 2) | Gain update enable | Logic HIGH freezes gain setting; LOW allows immediate gain changes - critical for synchronous AGC timing. |
| VCC (Pin 3) | Analog supply | 4 V to 5.25 V operation; powers core amplifier (excluding output stage bias, supplied externally via OUT+/OUT−). |
| GND (Pins 5, 8) | Ground reference | Low-impedance ground plane connection; exposed thermal pad must be soldered to PCB ground for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Enables large-signal swing on single 5 V supply while rejecting common-mode noise in mixed-signal IF paths. |
| On-chip 200 Ω / 400 Ω load selection | Eliminates external termination resistors; simplifies layout and reduces component count in ADC driver applications. |
| Single-ended to differential conversion | Accepts grounded-input single-ended sources without external balun - reduces BOM cost in legacy RF designs. |
| Self-biased input common mode | 1.4 V internal bias enables DC-coupled operation with minimal external components; supports ±1.4 V AC-coupled input swing. |
| CMOS-compatible digital interface | 3.3 V logic-level gain control eliminates level-shifting circuitry when interfacing with FPGA or ASIC AGC controllers. |
Applications
| Cellular Base Station Receiver | IF Sampling Receiver |
|---|---|
|
Use Scenario: Amplifying downconverted 70–300 MHz IF signals prior to digitization in macrocell BTS. IC Role / Device Role / Timing Role: Digitally controlled gain stage in automatic gain control (AGC) loop, compensating for varying RF path loss and interference. Use Value: 42 dB gain range extends system dynamic range without ADC saturation; 5 ns switching enables fast TDD channel adaptation. |
Use Scenario: Driving high-speed ADCs (e.g., ADC14155) in software-defined radio architectures with programmable IF frequencies. IC Role / Device Role / Timing Role: Precision ADC driver with matched gain steps ensuring consistent ENOB across gain states. Use Value: 8.3 dB noise figure and 39 dBm OIP3 preserve SFDR > 90 dBFS in multi-tone LTE signals at 169 MHz IF. |
| Instrumentation Signal Chain | Differential Line Receiver |
|
Use Scenario: Wideband signal conditioning in test equipment requiring calibrated gain steps and low distortion. IC Role / Device Role / Timing Role: Programmable gain element in modular digitizer front-end with deterministic settling behavior. Use Value: ±0.07 dB gain step error at 150 MHz enables traceable amplitude calibration without per-step correction tables. |
Use Scenario: Receiving balanced analog signals over twisted-pair cabling in industrial data acquisition systems. IC Role / Device Role / Timing Role: Differential receiver with 200 Ω input impedance matching cable characteristic impedance. Use Value: 81 dB CMRR rejects common-mode noise from EMI-prone environments; 260–600 MHz bandwidth supports high-speed analog telemetry. |
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 |
|---|---|---|---|
| AD8370ACPZ-R7 | 200 MHz bandwidth, 50 dB gain range, 20 dBm OIP3 at 100 MHz, 24-lead LFCSP package | Lower bandwidth and linearity; suited for sub-200 MHz IF stages where ultra-wideband performance is not required | Select AD8370ACPZ-R7 when system bandwidth < 200 MHz and higher gain range justifies larger package and lower integration. |
| MAX19723ETX+ | 1.2 GHz bandwidth, 31.5 dB gain range, 41 dBm OIP3 at 200 MHz, 24-pin TQFN package | Higher bandwidth but narrower gain range and no internal load selection; requires external termination | Select MAX19723ETX+ for >600 MHz IF applications where gain resolution and integrated load are secondary to raw bandwidth. |
Compared with AD8370ACPZ-R7 and MAX19723ETX+, LMH6514SQ/NOPB uniquely balances 600 MHz bandwidth, 42 dB gain range, on-chip 200/400 Ω load selection, and 5 ns switching-making it optimal for compact, thermally constrained IF receivers requiring calibrated AGC without external passive networks.
Availability
LMH6514SQ/NOPB is available at Aetrix Electronics and suitable for cellular infrastructure, instrumentation, IF sampling receivers, and differential line receiver designs requiring stable component supply and long-term production continuity.
Supply support for LMH6514SQ/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 LMH6514SQ/NOPB belongs to TI's high-speed amplifier portfolio, engineered specifically for digitally controlled gain applications in RF receiver signal chains where linearity, noise, and gain accuracy are critical.
FAQ
What is the absolute maximum supply voltage for LMH6514SQ/NOPB?
The absolute maximum positive supply voltage (VCC) for LMH6514SQ/NOPB is 5.5 V. Operation above 5.25 V is outside the specified operating range and may degrade performance or reliability. The device is rated for 4 V to 5.25 V operation, with typical performance characterized at 5 V.
Can LMH6514SQ/NOPB drive a 100 Ω differential load directly?
Yes, LMH6514SQ/NOPB can drive a 100 Ω differential load directly. With its internal 200 Ω load resistors in parallel with an external 100 Ω load, the effective load is ~67 Ω, enabling near-1 GHz bandwidth. This configuration is validated in TI's Electrical Characteristics table for SSBW testing at RL = 100 Ω.
How does the LOAD+ and LOAD− pin configuration affect gain in LMH6514SQ/NOPB?
Leaving LOAD+ (Pin 13) and LOAD− (Pin 16) floating selects the 400 Ω internal load configuration, yielding +38 dB maximum gain into 400 Ω. Shorting LOAD+ to LOAD− places the internal 200 Ω resistors in parallel, selecting the 200 Ω load mode and reducing maximum gain to +32 dB - trading gain for bandwidth and output drive capability.
Is LMH6514SQ/NOPB compatible with 5 V logic on its digital control pins?
No, LMH6514SQ/NOPB digital control pins (GAIN_0–GAIN_2, LATCH) are strictly 3.3 V CMOS-compatible. Applying 5 V logic signals may cause permanent damage. VIH is specified at 2.0 V max, and absolute maximum digital input voltage is 3.6 V - external level shifters are required for 5 V controller interfaces.
What is the recommended power supply decoupling for LMH6514SQ/NOPB?
TI recommends ceramic, low-ESR bypass capacitors on VCC (Pin 3): a 100 nF capacitor placed within 2 mm of the pin, plus a 10 µF bulk capacitor nearby. The exposed thermal pad must be soldered to a solid ground plane to ensure thermal stability and minimize ground bounce during fast gain transitions.
LMH6514SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 600 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 107mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (4x4)
LMH6514SQ/NOPB FAQ
1.How can I place an order for LMH6514SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6514SQ/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 LMH6514SQ/NOPB reliable?
The price and inventory of LMH6514SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6514SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6514SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6514SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6514SQ/NOPB?
LMH6514SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6514SQ/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 LMH6514SQ/NOPB?
For technical support, including LMH6514SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6514SQ/NOPB requirements.
6.How does Aetrix verify that LMH6514SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6514SQ/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 LMH6514SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6514SQ/NOPB?
All LMH6514SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6514SQ/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 LMH6514SQ/NOPB part is unused and in its original packaging.
Return procedure for LMH6514SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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