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Texas Instruments LMH6514SQE/NOPB
- Part No.:
- LMH6514SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LMH6514SQE/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
LMH6514SQE/NOPB from Texas Instruments is a 600 MHz digitally controlled variable gain amplifier (DVGA) with precise 6.02 dB gain steps, 200 Ω differential input impedance, and selectable 200 Ω / 400 Ω output load configuration. It delivers 39 dBm OIP3 at 75 MHz into 200 Ω and supports automatic gain control in IF sampling receivers driving high-speed ADCs like ADC14155.
For engineers reviewing the LMH6514SQE/NOPB datasheet, LMH6514SQE/NOPB pinout, LMH6514SQE/NOPB application, or LMH6514SQE/NOPB equivalent, key selection criteria include gain step accuracy (±0.07 dB at 150 MHz), 5 ns gain switching time, noise figure (8.3 dB), and WQFN-16 package thermal performance (θJA = 47°C/W).
Technical Context
The LMH6514SQE/NOPB integrates a 7-step digital attenuator (0 to −42 dB) followed by a high-linearity transconductor (0.1 A/V) with on-chip 200 Ω or 400 Ω termination. Its fully differential signal path accepts single-ended or differential inputs and operates from a single 4–5.25 V supply.
Gain is set via three parallel CMOS-compatible pins (GAIN_0–GAIN_2) latched by the LATCH pin; output common mode is externally set using RF chokes to enable >5.6 VPP differential swing. The open-collector OUT+ and OUT− outputs require external biasing for proper Class A operation and distortion performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 600 MHz at 100 Ω load - enables wideband IF amplification up to cellular LTE and WiMAX frequencies. |
| OIP3 | 39 dBm at 75 MHz, 200 Ω load - ensures high linearity for multi-carrier base station signals without spectral regrowth. |
| Gain Range | 26 dB to 38 dB - configurable via 3-bit parallel interface; maximum gain varies with load (26 dB @ 200 Ω, 38 dB @ 400 Ω). |
| Noise Figure | 8.3 dB - maintains system SNR when driving 14-bit ADCs such as ADC14155 in sensitive receiver front-ends. |
| Gain Step Accuracy | ±0.07 dB at 150 MHz - guarantees predictable AGC loop behavior across temperature (−40°C to +85°C). |
| Supply Current | 100 mA typical - balances power efficiency with RF performance in thermally constrained WQFN-16 layouts. |
| Switching Time | 5 ns - supports fast gain updates in burst-mode communication systems and radar pulse processing. |
Pinout & Package
LMH6514SQE/NOPB is housed in a 4 mm × 4 mm, 16-pin thermally enhanced WQFN package with exposed thermal pad (GND). Pin 1 is top-left corner (marked dot); pin numbering follows standard counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | 200 Ω resistive input impedance; self-biased to 1.4 V; AC-coupled operation supports ±1.4 V input swing. |
| OUT+, OUT− | Open-collector differential outputs | Require external RF choke bias to 5 V; support >5.6 VPP swing with proper common-mode setting. |
| GAIN_0, GAIN_1, GAIN_2 | Digital gain control inputs | 3.3 V CMOS-compatible; define 7 gain states (0–42 dB attenuation) in 6.02 dB increments. |
| LATCH | Gain update enable | LOW = dynamic gain changes; HIGH = hold current gain setting; prevents spurious switching during digital transitions. |
| LOAD+, LOAD− | Internal load resistor terminals | Short LOAD+ to LOAD− to select 200 Ω internal load (lower gain, higher bandwidth); leave floating for 400 Ω mode (higher gain). |
| VCC | Analog supply | 4–5.25 V input; powers core amplifier; bypass with low-ESR ceramic capacitor near pin 3. |
| GND (Pins 5, 8, thermal pad) | Ground reference | Low-impedance return path for analog, digital, and thermal dissipation; all voltages referenced to these pins. |
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 PCB environments. |
| On-chip 200 Ω / 400 Ω load selection | Eliminates need for external termination resistors; simplifies layout and improves repeatability of gain vs. frequency response. |
| Single-ended to differential conversion | Allows direct interfacing with 50 Ω or 200 Ω single-ended RF sources using LC matching networks (e.g., 550 nH + 36 pF at 100 MHz). |
| Class A output stage | Delivers ultra-linear operation (OIP3 ≥35 dBm up to 250 MHz) critical for high-SFDR ADC driver applications. |
| Industrial temperature range | Specified from −40°C to +85°C with guaranteed gain step error and OIP3 performance - suitable for outdoor base station deployment. |
Applications
| Cellular Base Stations | IF Sampling Receivers |
|---|---|
|
Use Scenario: Amplifying downconverted 70–300 MHz IF signals in macrocell BTS before digitization. IC Role / Device Role / Timing Role: DVGA providing programmable gain control in AGC loop to maintain ADC input within full-scale range amid varying RF signal strength. Use Value: 42 dB gain range and 5 ns switching enable rapid adaptation to adjacent-channel interference and fading multipath conditions. |
Use Scenario: Driving 14-bit, 155 MSPS ADC14155 in high-IF receiver architectures operating at 169 MHz. IC Role / Device Role / Timing Role: Precision ADC driver with matched differential output impedance and low noise figure to preserve SNR and SFDR. Use Value: 8.3 dB noise figure and 39 dBm OIP3 directly contribute to measured 72 dBFS SNR and >90 dBFS SFDR on TI's ADC14V155KDRB reference design. |
| Instrumentation | Differential Line Receiver |
|
Use Scenario: Wideband signal conditioning in automated test equipment requiring calibrated gain steps and flat frequency response. IC Role / Device Role / Timing Role: Programmable gain element in modular signal source or analyzer front-end with traceable 6.02 dB per step accuracy. Use Value: ±0.07 dB gain step error at 150 MHz ensures measurement repeatability across instrument calibration cycles. |
Use Scenario: Receiving balanced analog data over twisted-pair cables in industrial control systems with high EMI immunity. IC Role / Device Role / Timing Role: Differential receiver converting legacy 200 Ω line signals to single-ended or differential ADC inputs with common-mode rejection. Use Value: 81 dB CMRR and 63–81 dB PSRR suppress ground bounce and supply noise in noisy factory-floor environments. |
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 | 3 GHz bandwidth, 30 dB gain range, requires external DAC for gain control; no integrated latch. | Better suited for microwave front-ends (>1 GHz); lacks on-chip register and parallel interface. | Select when wider bandwidth and external precision DAC control are prioritized over board space and digital simplicity. |
| LMH6518SQE/NOPB | Same WQFN-16 package, 2.2 GHz bandwidth, 30 dB gain range, 3.3 V supply only; includes SPI interface. | Targets higher-frequency IF stages (e.g., 400–1800 MHz); consumes less power (75 mA) but has lower OIP3 (32 dBm @ 200 MHz). | Choose for next-generation designs needing extended bandwidth and serial control, accepting trade-offs in linearity and gain range. |
Compared with ADL5330ACPZ-R7 and LMH6518SQE/NOPB, the LMH6514SQE/NOPB offers optimal balance of 600 MHz bandwidth, 42 dB gain range, parallel 3-bit control, and proven integration with ADC14155 - making it the preferred choice for cost-sensitive, space-constrained IF sampling receivers in sub-1 GHz infrastructure.
Availability
LMH6514SQE/NOPB is available at Aetrix Electronics and suitable for cellular base stations, IF sampling receivers, instrumentation, and differential line receiver applications requiring stable component supply, long-term lifecycle assurance, and production-ready qualification.
Supply support for LMH6514SQE/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 LMH6514SQE/NOPB belongs to TI's high-speed amplifier portfolio designed specifically for RF/IF signal conditioning in wireless infrastructure, where precise gain control, wide bandwidth, and low distortion are mandatory.
FAQ
What is the absolute maximum supply voltage for LMH6514SQE/NOPB?
The absolute maximum positive supply voltage (Pin 3, VCC) for LMH6514SQE/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 characterized and guaranteed from 4 V to 5.25 V, with thermal derating required above 5.25 V per Absolute Maximum Ratings.
Can LMH6514SQE/NOPB drive a 100 Ω differential load directly?
Yes, LMH6514SQE/NOPB can drive a 100 Ω differential load directly. With its internal 200 Ω load active and an external 100 Ω termination, the effective load is ~67 Ω, enabling nearly 1 GHz bandwidth. However, gain drops to ~26 dB, and OIP3 remains ≥35 dBm - verified in Electrical Characteristics tables for RL = 100 Ω configurations.
How does the LOAD+ and LOAD− pin configuration affect LMH6514SQE/NOPB gain?
Shorting LOAD+ (Pin 13) to LOAD− (Pin 16) selects the 200 Ω internal load option, yielding lower gain (26 dB max) and higher bandwidth (600 MHz). Leaving both pins floating selects the 400 Ω internal load, delivering higher gain (38 dB max) but reduced bandwidth (260 MHz). This hardware-selectable mode eliminates external resistor placement.
Is LMH6514SQE/NOPB compatible with 5 V logic on its gain control pins?
No, LMH6514SQE/NOPB gain control pins (GAIN_0–GAIN_2) and LATCH are strictly 3.3 V CMOS-compatible. Applying 5 V logic violates Absolute Maximum Ratings (VIH max = 3.6 V) and risks permanent damage. Interface must use level-shifting or 3.3 V FPGA/CPLD I/O banks.
What is the recommended output biasing network for LMH6514SQE/NOPB?
The recommended output biasing network for LMH6514SQE/NOPB uses RF chokes (e.g., 470 nH) from OUT+ and OUT− to 5 V, as shown in Figure 53 of the datasheet. This establishes a 5 V common mode, enabling >5.6 VPP differential swing. Capacitive AC coupling is mandatory; DC coupling requires >5.25 V supplies and careful common-mode voltage alignment.
LMH6514SQE/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)
LMH6514SQE/NOPB FAQ
1.How can I place an order for LMH6514SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6514SQE/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 LMH6514SQE/NOPB reliable?
The price and inventory of LMH6514SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6514SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6514SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6514SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6514SQE/NOPB?
LMH6514SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6514SQE/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 LMH6514SQE/NOPB?
For technical support, including LMH6514SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6514SQE/NOPB requirements.
6.How does Aetrix verify that LMH6514SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6514SQE/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 LMH6514SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6514SQE/NOPB?
All LMH6514SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6514SQE/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 LMH6514SQE/NOPB part is unused and in its original packaging.
Return procedure for LMH6514SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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