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Texas Instruments LMH6502MA/NOPB
- Part No.:
- LMH6502MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6502MA/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
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Product details
Overview
LMH6502MA/NOPB from Texas Instruments (formerly National Semiconductor) is a wideband, linear-in-dB voltage-controlled variable gain amplifier (VGA) with differential inputs and current-feedback output stage. It delivers 130MHz −3dB bandwidth, 70dB gain adjustment range up to 10MHz, ±75mA linear output current, and <350mV output-referred DC offset across full VG control range. It serves as the core gain-control element in analog video signal chains, RF AGC loops, and high-speed instrumentation front-ends.
For engineers reviewing the LMH6502MA/NOPB datasheet, LMH6502MA/NOPB pinout, LMH6502MA/NOPB application, or LMH6502MA/NOPB equivalent, key selection criteria include guaranteed gain matching (±0.6dB at max gain), linear-in-dB control linearity over 0–2V VG, slew rate of 1800V/µs, and SOIC-14 package compatibility with single- or dual-supply operation down to ±2.5V.
Technical Context
The LMH6502MA/NOPB integrates a DC-coupled differential input transconductance stage followed by a high-speed current-feedback op amp. Gain is controlled via a 0–2V voltage applied to Pin 2 (VG), where Q1/Q2 transistor current steering sets attenuation relative to AVMAX, defined by external RF/RG resistors. The architecture enables precise dB-linear gain scaling without requiring logarithmic conversion circuitry.
Its differential input structure provides >55dB CMRR and supports common-mode rejection in low-level amplification or long-wire signal transmission. The output stage drives 100Ω loads directly with ±3.2V swing and maintains stability without external compensation-though snubbers are recommended for capacitive loads or light loads (<1kΩ) above 400MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 130MHz - supports full HD video baseband and IF sampling up to 65MHz Nyquist. |
| Gain Control Range | 72dB @ f < 10MHz - enables wide dynamic range compression in AGC systems without digital intervention. |
| Slew Rate | 1800V/µs - preserves fast edge integrity in pulse-amplitude-modulated signals and radar IF stages. |
| Output Current | ±75mA - drives 100Ω video loads or 50Ω transmission lines directly, eliminating buffer stages. |
| Input Voltage Noise | 7.7nV/√Hz - ensures minimal SNR degradation in low-amplitude sensor interface applications. |
| Supply Current | 27mA @ ±5V - achieves high speed with low power, critical for portable or thermally constrained designs. |
| Gain Matching | ±0.6dB @ AVMAX - guarantees consistent channel-to-channel gain in multi-path imaging or beamforming systems. |
Pinout & Package
LMH6502MA/NOPB is housed in a 14-pin SOIC package (NSC drawing M14A), 8.65mm × 3.91mm body, 1.27mm pitch, with exposed pad not present. Thermal resistance θJA = 138°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply rail | Accepts −2.5V to −6V; referenced to Pin 11 (GND); must be bypassed locally with 0.1µF ceramic. |
| 2 (VG) | Gain control voltage input | 0–2V linear-in-dB control; 10kΩ input resistance; bias current −300µA at 0V; sets gain from cutoff to AVMAX. |
| 3 (+IN) | Non-inverting differential input | DC-coupled; 750kΩ input resistance; ±0.12V max differential input for linear operation. |
| 4 (RG−) | Negative gain-setting resistor terminal | Connects to RG; forms transconductance path with Pin 5; sensitive to stray capacitance-minimize trace area. |
| 5 (RG+) | Positive gain-setting resistor terminal | Connects to RG; pairs with Pin 4 to define AVMAX; layout symmetry critical for gain accuracy. |
| 6 (−IN) | Inverting differential input | DC-coupled; matched to Pin 3; common-mode range ±1.7V; enables single-ended use when grounded. |
| 7 (V+) | Positive supply rail | Accepts +2.5V to +6V; referenced to Pin 11 (GND); requires local 0.1µF + 4.7µF bypassing. |
| 8 (NC) | No connect | Internally unused; leave unconnected; do not route traces or apply voltage. |
| 9 (NC) | No connect | Internally unused; leave unconnected; avoid parasitic coupling. |
| 10 (OUT) | Main output terminal | Current-feedback output; ±3.2V swing into 100Ω; avoid direct capacitive loading-add series R if needed. |
| 11 (GND) | Analog ground reference | System ground reference point; in single-supply mode, tied to virtual mid-rail (e.g., V+/2). |
| 12 (I−) | Inverting summing node | High-impedance node internal to output amplifier; extremely sensitive to stray capacitance-keep trace short and isolated. |
| 13 (RF) | Feedback resistor terminal | Connects to RF (typically 1kΩ); defines closed-loop gain with RG; optimized for 1kΩ for best bandwidth/noise trade-off. |
| 14 (NC) | No connect | Internally unused; leave floating; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables seamless integration into analog AGC loops without log-amp or DAC-based calibration. |
| Differential input architecture | Provides >55dB CMRR and rejects noise on long interconnects-ideal for CCTV camera modules and medical imaging sensors. |
| Current-feedback output stage | Delivers 1800V/µs slew rate and ±75mA drive into 100Ω, eliminating need for external buffers in video distribution. |
| Guaranteed gain matching | ±0.6dB tolerance at AVMAX ensures consistent gain across multiple channels in phased-array receivers or multi-sensor data acquisition. |
| Single-supply compatible VG range | 0–2V control voltage referenced to Pin 11 allows direct interfacing with 3.3V or 5V DACs-no level-shifting required. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying analog RGB or Y/C signals from CCD/CMOS image sensors before ADC digitization in broadcast cameras or machine vision systems. IC Role / Device Role / Timing Role: Primary VGA stage providing programmable gain from 0dB to 20dB while preserving flat frequency response up to 100MHz. Use Value: Maintains <0.34% differential gain and <0.10° differential phase error at 4.43MHz-critical for NTSC/PAL color fidelity. | Use Scenario: Closed-loop gain stabilization in RF receiver IF paths where input signal strength varies over 40dB (e.g., cellular base station front-end). IC Role / Device Role / Timing Role: Voltage-controlled gain element whose VG is dynamically adjusted by an integrator-driven rectified output feedback signal. Use Value: Delivers 70dB control range with <±0.6dB unit-to-unit matching-enabling stable loop convergence without per-unit calibration. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision amplitude trimming in test equipment signal generators or calibrated reference sources. IC Role / Device Role / Timing Role: Digitally programmable attenuator replacing mechanical potentiometers or relay-based step attenuators. Use Value: Achieves monotonic 0.1dB resolution over 72dB range with <350mV output offset drift-reducing calibration overhead in automated test systems. | Use Scenario: Tunable low-pass or band-pass filtering in software-defined radio (SDR) receive chains using VG to adjust cutoff frequency. IC Role / Device Role / Timing Role: Gain-stage-based filter topology where VG modulates effective RC time constants in feedback networks. Use Value: Enables real-time bandwidth adjustment from 10MHz to 130MHz while retaining group delay flatness <2.5ns-supporting adaptive channel selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MA/NOPB | Linear-in-V gain control (not dB); 100MHz BW; same SOIC-14 package; lower THD (−65dBc vs −53dBc). | Better suited for linear gain interpolation (e.g., motor control feedback), less ideal for logarithmic AGC loops. | Select LMH6503MA/NOPB only when precise linear gain ramping-not dB scaling-is required. |
| AD8367ARUZ | 500MHz bandwidth; 45dB range; 5V single-supply; RMS-detected AGC interface; different pinout and biasing. | Designed for RF/IF AGC with integrated detector; lacks DC coupling and differential inputs. | Choose AD8367ARUZ for GHz-range wireless IF gain control; avoid for baseband video or precision DC-coupled applications. |
Compared with LMH6502MA/NOPB, LMH6503MA/NOPB trades dB-linearity for improved harmonic distortion and linear gain predictability, while AD8367ARUZ offers higher RF bandwidth but sacrifices DC coupling, differential inputs, and SOIC-14 footprint compatibility-making LMH6502MA/NOPB the optimal choice for wideband analog video and instrumentation-grade AGC.
Availability
LMH6502MA/NOPB is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, and variable attenuator applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for LMH6502MA/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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy high-performance analog products.
The LMH6502MA/NOPB belongs to TI's LMH™ high-speed amplifier portfolio, engineered specifically for wideband analog signal conditioning in video, instrumentation, and communications infrastructure where precision gain control, low distortion, and DC coupling are mandatory.
FAQ
What is the maximum supply voltage rating for LMH6502MA/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6502MA/NOPB is 12.6V. Operating ratings specify a functional range of 5V to 12V total supply span (e.g., ±2.5V to ±6V or +5V/−5V). Exceeding 12.6V risks permanent damage. At ±5V operation, LMH6502MA/NOPB delivers its full 130MHz bandwidth and 72dB gain range; performance degrades gradually below ±2.5V due to reduced headroom and shifted VG limits.
Does LMH6502MA/NOPB support true single-supply operation?
Yes, LMH6502MA/NOPB supports single-supply operation by tying Pin 11 (GND) to a virtual mid-rail (e.g., V+/2 via resistor divider or active buffer). The VG control range becomes 0V to +2V relative to this mid-rail, enabling direct interface with 3.3V or 5V DACs. Input common-mode range extends to ±1.7V around mid-rail, and output swings to within 0.8V of each rail-ensuring usable dynamic range without level-shifting circuitry.
What is the purpose of Pins 4 and 5 (RG− and RG+) on LMH6502MA/NOPB?
Pins 4 and 5 form the differential input to the transconductance stage that sets AVMAX via external resistor RG. Their voltage difference controls the signal current injected into the gain-steering transistor pair (Q1/Q2). Layout symmetry between these pins is critical: mismatched trace lengths or parasitic capacitance causes gain nonlinearity and degrades VG-to-gain accuracy. RG values are selected based on desired AVMAX and input amplitude constraints per Equation (1) in the datasheet.
Can LMH6502MA/NOPB drive a 50Ω load directly?
LMH6502MA/NOPB is characterized and stable driving 100Ω loads, but can drive 50Ω with minor trade-offs. Output swing reduces to ±2.5V (vs ±3.2V into 100Ω), and thermal dissipation increases by ~30%. For sustained 50Ω operation, verify junction temperature stays below 150°C using θJA = 138°C/W. Add a small series resistor (e.g., 10Ω) at Pin 10 to isolate capacitive loads and prevent peaking above 400MHz.
How does gain matching tolerance affect multi-channel designs using LMH6502MA/NOPB?
LMH6502MA/NOPB guarantees device-to-device gain matching within ±0.6dB at maximum gain (AVMAX). In multi-channel systems like phased-array receivers or stereo video processors, this tolerance ensures channel gain imbalance remains under 1.2dB worst-case-eliminating need for per-channel digital correction in moderate-precision applications. For tighter matching, TI provides lot-specific gain data upon request, enabling binning during assembly.
LMH6502MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1800V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 9 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 27mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LMH6502MA/NOPB FAQ
1.How can I place an order for LMH6502MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6502MA/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 LMH6502MA/NOPB reliable?
The price and inventory of LMH6502MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6502MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6502MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6502MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6502MA/NOPB?
LMH6502MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6502MA/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 LMH6502MA/NOPB?
For technical support, including LMH6502MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6502MA/NOPB requirements.
6.How does Aetrix verify that LMH6502MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6502MA/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 LMH6502MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6502MA/NOPB?
All LMH6502MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6502MA/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 LMH6502MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6502MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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