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Texas Instruments LMH6514SQX/NOPB
- Part No.:
- LMH6514SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LMH6514SQX/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
LMH6514SQX/NOPB from Texas Instruments is a 600 MHz digitally controlled variable gain amplifier (DVGA) with 42 dB gain range, precise 6.02 dB gain steps, and fully differential signal path. It features 200 Ω input impedance, selectable 200 Ω or 400 Ω output load, and drives high-performance ADCs in IF sampling receivers and cellular base stations.
For engineers reviewing the LMH6514SQX/NOPB datasheet, LMH6514SQX/NOPB pinout, LMH6514SQX/NOPB application, or LMH6514SQX/NOPB equivalent, key selection criteria include gain step accuracy (±0.07 dB at 150 MHz), 5 ns gain switching time, 8.3 dB noise figure, OIP3 of 39 dBm at 75 MHz (200 Ω load), and WQFN-16 thermal performance (θJA = 47 °C/W).
Technical Context
The LMH6514SQX/NOPB integrates a digitally controlled 7-step attenuator (0 to −42 dB) followed by a high-gain ultra-linear transconductor (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 three parallel CMOS-compatible digital inputs (GAIN_0–GAIN_2) latched by the LATCH pin; internal 200 Ω or 400 Ω loads are selected by connecting LOAD+ and LOAD− pins, directly determining net voltage gain (26 dB or 32–38 dB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 600 MHz at 100 Ω load - supports wideband IF signals up to cellular LTE and WiMAX frequencies. |
| OIP3 | 39 dBm at 75 MHz, 200 Ω load - enables high-linearity receiver front-ends with >90 dBFS SFDR when paired with ADC14V155. |
| Noise Figure | 8.3 dB at maximum gain - preserves SNR in low-level signal amplification before ADC sampling. |
| Gain Range | 26 dB to 38 dB max (load-dependent); −12.75 dB min - provides 42 dB dynamic control for AGC loops. |
| Gain Step Accuracy | ±0.07 dB at 150 MHz - ensures predictable, repeatable channel gain calibration across temperature (−40°C to +85°C). |
| Supply Current | 107–124 mA at 5 V - optimized for power-sensitive RF subsystems with thermal pad-enabled WQFN-16 dissipation. |
| Switching Time | 5 ns gain step transition - supports fast AGC response in burst-mode or TDD systems without settling artifacts. |
Pinout & Package
LMH6514SQX/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 (marking dot adjacent), pin count proceeds counter-clockwise.
| 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 VPP input swing. |
| OUT+, OUT− | Open-collector differential outputs | Require external 5 V bias via RF choke; support 5.6 VPP differential swing with 5 V common mode. |
| LOAD+, LOAD− | Internal load resistor terminals | Select 200 Ω (floating) or 400 Ω (shorted) effective load - determines net gain: 26 dB vs. 32–38 dB. |
| GAIN_0, GAIN_1, GAIN_2 | Digital gain control inputs | CMOS 3.3 V logic; define 7-step attenuation (0 to −42 dB) in 6.02 dB increments; latched by LATCH pin. |
| LATCH | Gain update enable | LOW = gain updates immediately on control pin changes; HIGH = gain held static - critical for glitch-free AGC timing. |
| VCC | Analog supply | 4 V to 5.25 V single supply; powers core amplifier (not output stage); bypass with ceramic capacitor near pin. |
| GND (Pins 5, 8, thermal pad) | Ground reference | Low-impedance return for analog, digital, and thermal paths; thermal pad must be soldered to PCB ground plane. |
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 layouts. |
| On-chip 200 Ω / 400 Ω load selection | Eliminates need for external termination resistors; simplifies layout and improves repeatability of gain and bandwidth. |
| Single-ended to differential capability | IN− can be AC-coupled to ground, allowing direct interface with 50 Ω single-ended RF sources using LC matching networks. |
| Class-A output stage | Delivers ultra-low distortion (IMD3 < −70 dBc at 75 MHz) essential for high-SFDR ADC driver applications. |
| Industrial temperature range | Specified from −40°C to +85°C with guaranteed gain step error and OIP3 - suitable for outdoor base station deployment. |
Applications
| Cellular Base Stations | IF Sampling Receivers |
|---|---|
Use Scenario: Amplifying downconverted RF signals in macro/microcell BTS transceivers with automatic gain control. IC Role / Device Role / Timing Role: DVGA in receive chain between mixer and ADC; gain updated per burst or frame to maintain ADC input within full-scale range. Use Value: 42 dB AGC range extends system dynamic range; 5 ns switching enables real-time gain adaptation in TDD-LTE uplink slots. |
Use Scenario: Driving high-speed ADCs (e.g., ADC14V155) in software-defined radio IF stages operating at 169 MHz. IC Role / Device Role / Timing Role: Precision ADC driver with calibrated 6.02 dB gain steps; interfaces directly to differential ADC inputs. Use Value: Achieves 72 dBFS SNR and >90 dBFS SFDR on TI's High IF Receiver reference design board. |
| Instrumentation | Modems |
Use Scenario: Signal conditioning in broadband test equipment requiring flat gain over 600 MHz bandwidth. IC Role / Device Role / Timing Role: Wideband voltage amplifier with stable 200 Ω input termination for 50 Ω/75 Ω system interfacing. Use Value: 600 MHz −3 dB bandwidth and <0.3 dB gain flatness (10–100 MHz) ensure accurate amplitude measurement. |
Use Scenario: Gain control in cable modem DOCSIS 3.1 upstream channel receivers handling 5–85 MHz signals. IC Role / Device Role / Timing Role: Digitally programmable front-end amplifier compensating for varying cable loss and splitter attenuation. Use Value: 8.3 dB noise figure and 39 dBm OIP3 preserve CNR in multi-channel upstream aggregation. |
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, 50 Ω I/O, requires external DAC for gain control (not parallel digital interface). | Better suited for microwave (>1 GHz) upconverters; lacks integrated latch and on-chip load resistors. | Choose ADL5330ACPZ-R7 for higher-frequency RF gain control where parallel digital interface is not required. |
| MAX19723ETJ+ | 2.5 GHz bandwidth, 31.5 dB gain range, 50 Ω I/O, 3-wire SPI interface, no internal load selection. | Optimized for direct-conversion receivers; higher supply current (145 mA) and no 6.02 dB step precision. | Choose MAX19723ETJ+ for SPI-based systems needing wider bandwidth but accepting looser gain step tolerance (±0.3 dB). |
Compared with ADL5330ACPZ-R7 and MAX19723ETJ+, the LMH6514SQX/NOPB uniquely delivers 6.02 dB gain steps with ±0.07 dB accuracy, integrated 200/400 Ω load selection, and parallel 3-bit latch interface - making it optimal for cost-sensitive, space-constrained IF sampling designs requiring deterministic, low-latency AGC.
Availability
LMH6514SQX/NOPB is available at Aetrix Electronics and suitable for cellular infrastructure, instrumentation, and high-speed data acquisition systems requiring stable component supply, industrial temperature operation, and production-ready WQFN packaging.
Supply support for LMH6514SQX/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 LMH6514SQX/NOPB belongs to TI's high-speed amplifier portfolio, engineered specifically for digitally controlled gain applications in wireless infrastructure and precision data acquisition where linearity, noise, and gain accuracy are critical.
FAQ
What is the absolute maximum supply voltage for LMH6514SQX/NOPB?
The absolute maximum positive supply voltage (VCC) for LMH6514SQX/NOPB is 5.5 V. Operation above 5.25 V is outside the recommended operating range and may degrade long-term reliability or parametric performance. The device is specified for 4 V to 5.25 V operation across −40°C to +85°C.
How does output load configuration affect gain and bandwidth in LMH6514SQX/NOPB?
In LMH6514SQX/NOPB, shorting LOAD+ and LOAD− selects the 400 Ω internal load option, yielding higher voltage gain (up to +38 dB) but reduced bandwidth (260 MHz at 200 Ω effective load). Leaving LOAD+ and LOAD− floating selects the 200 Ω option, delivering +26 dB gain with full 600 MHz bandwidth at 100 Ω total load - ideal for wideband IF applications.
Can LMH6514SQX/NOPB drive a 50 Ω single-ended source directly?
LMH6514SQX/NOPB cannot directly terminate a 50 Ω single-ended source due to its 200 Ω differential input. However, it supports single-ended operation via AC coupling IN− to ground and using an LC matching network (e.g., 50 Ω → 200 Ω transformation at 100 MHz), as validated in TI's Application Report SNOSB06A Figure 46.
What is the role of the LATCH pin in LMH6514SQX/NOPB operation?
The LATCH pin in LMH6514SQX/NOPB controls gain update timing: when pulled HIGH, gain remains fixed regardless of GAIN_0–GAIN_2 state changes; when LOW, gain updates immediately on control pin transitions. This prevents glitches during asynchronous digital control and enables synchronized AGC updates in time-division systems.
Does LMH6514SQX/NOPB require external output biasing components?
Yes - LMH6514SQX/NOPB has open-collector outputs (OUT+, OUT−) and requires external 5 V biasing via RF chokes or inductors to establish output common-mode voltage and enable full 5.6 VPP differential swing. Direct connection to 5 V without inductive isolation risks saturation and violates absolute maximum ratings for output voltage (6.4 V).
LMH6514SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
LMH6514SQX/NOPB FAQ
1.How can I place an order for LMH6514SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6514SQX/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 LMH6514SQX/NOPB reliable?
The price and inventory of LMH6514SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6514SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6514SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6514SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6514SQX/NOPB?
LMH6514SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6514SQX/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 LMH6514SQX/NOPB?
For technical support, including LMH6514SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6514SQX/NOPB requirements.
6.How does Aetrix verify that LMH6514SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6514SQX/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 LMH6514SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6514SQX/NOPB?
All LMH6514SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6514SQX/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 LMH6514SQX/NOPB part is unused and in its original packaging.
Return procedure for LMH6514SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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