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Texas Instruments LMH6502MTX/NOPB
- Part No.:
- LMH6502MTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6502MTX/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMH6502MTX/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 over full VG control range. It serves as the core gain-control element in analog AGC loops for video imaging and RF signal conditioning.
For engineers reviewing the LMH6502MTX/NOPB datasheet, LMH6502MTX/NOPB pinout, LMH6502MTX/NOPB application, or LMH6502MTX/NOPB equivalent, key selection criteria include guaranteed gain matching (±0.6dB at max gain), linear-in-dB transfer characteristic across temperature, slew rate (1800 V/µs), and compatibility with ±5V or single-supply operation via virtual ground on pin 11.
Technical Context
The LMH6502MTX/NOPB integrates a DC-coupled differential input transconductance stage followed by a high-speed current-feedback op amp. Gain is controlled by a 0V–+2V voltage applied to pin 2 (VG), where Q1/Q2 current steering sets attenuation relative to AVMAX set by external RF/RG network.
Its architecture enables simultaneous wideband flatness (±0.3dB up to 30MHz), low distortion (THD = −53dBc at 20MHz), and robust common-mode rejection (>72dB CMRR). The device operates from ±2.5V to ±5V supplies and supports single-ended or differential signal paths without performance penalty.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 130 MHz - supports full HD video baseband and IF sampling up to 65 MSPS. |
| Gain Adjustment Range | 72 dB (f < 10 MHz) - enables >4-decade dynamic range compression in AGC systems. |
| Slew Rate | 1800 V/µs - ensures faithful reproduction of fast-rising video sync pulses and radar chirps. |
| Output Current | ±75 mA - drives 100Ω loads directly without external buffers, reducing BOM count. |
| Input Noise Density | 7.7 nV/√Hz - maintains SNR > 62 dB in 10MHz video channels with 100Ω source impedance. |
| Gain Matching | ±0.6 dB at AVMAX - allows multi-channel gain calibration without per-unit trimming in imaging arrays. |
| Supply Current | 27 mA (no load, ±5V) - enables low-power portable instrumentation with <300 mW total dissipation. |
Pinout & Package
LMH6502MTX/NOPB is packaged in a 14-pin TSSOP (MTC14) with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed thermal pad. Thermal resistance θJA = 160°C/W enables stable operation at +85°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output | Current-feedback amplifier output; capable of ±75 mA into 100Ω with 1800 V/µs slew. |
| 2 (VG) | Gain Control Voltage | 0V–+2V referenced to pin 11; linear-in-dB response with 4.8 dB/ns gain change rate. |
| 3 (+IN) | Differential Input (+) | High-impedance (750 kΩ) buffered input; accepts ±0.12V differential swing for linear operation. |
| 4 (RG1) | Gain Set Resistor Terminal | Connects to one end of RG; sets maximum gain AVMAX = 1 + RF/RG when combined with pin 5. |
| 5 (RG2) | Gain Set Resistor Terminal | Completes RG connection; internal bias current ±1.56 mA limits minimum RG to ~590Ω. |
| 6 (−IN) | Differential Input (−) | Matches pin 3; enables common-mode rejection >72 dB and noise cancellation on long traces. |
| 7 (V−) | Negative Supply | Accepts −2.5V to −5V; PSRR −41 dB ensures immunity to negative rail noise. |
| 8 (NC) | No Connect | Internally unused; must remain floating or grounded per layout guidelines. |
| 9 (NC) | No Connect | Internally unused; no routing or loading permitted. |
| 10 (I−) | Inverting Summing Node | High-sensitivity node; stray capacitance degrades phase margin-keep trace area minimal. |
| 11 (GND) | Ground Reference | Reference for VG and VCM; tied to virtual half-supply in single-supply designs. |
| 12 (I+) | Non-Inverting Summing Node | Internal node for current-steering Q1/Q2; not externally accessible. |
| 13 (V+) | Positive Supply | Accepts +2.5V to +5V; +PSRR −47 dB rejects positive rail ripple at baseband. |
| 14 (RF) | Feedback Resistor Terminal | Optimized for 1 kΩ RF; lower values require loop-gain compensation per QA-13 application note. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain law | Enables precise, temperature-stable AGC with constant dB/V slope across −40°C to +85°C. |
| Differential input architecture | Provides >55 dB CMRR at 4.43 MHz for broadcast video applications with long cable runs. |
| Current-feedback output stage | Delivers 130 MHz bandwidth independent of closed-loop gain-unlike voltage-feedback op amps. |
| Guaranteed gain accuracy | ±0.6 dB max error at VG = 2.0 V ensures predictable system-level gain calibration. |
| Single-supply ready | VG range (0V to +2V w.r.t. pin 11) simplifies level-shifting in 3.3V/5V systems using virtual ground. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying composite video signals (NTSC/PAL) prior to ADC sampling in medical endoscopes and broadcast cameras. IC Role / Device Role / Timing Role: VGA front-end providing programmable 0–40 dB gain with <0.34% differential gain and <0.10° differential phase error. Use Value: Preserves luminance/chrominance separation and color fidelity across varying scene brightness without manual adjustment. | Use Scenario: Closed-loop gain stabilization in RF receiver IF stages handling −80 dBm to −40 dBm input signals. IC Role / Device Role / Timing Role: Core variable-gain element in analog feedback loop with LMH6714 post-amplifier and LMH6657 integrator. Use Value: Maintains constant output amplitude over ≥40 dB input dynamic range while preserving signal integrity up to 10 MHz. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision signal leveling in automated test equipment (ATE) stimulus paths for mixed-signal IC validation. IC Role / Device Role / Timing Role: Digitally programmed attenuator replacing mechanical potentiometers or relay-based networks. Use Value: Enables software-defined attenuation steps with 0.1 dB resolution and <2.2 ns rise/fall time for fast settling. | Use Scenario: Tunable low-pass filtering in ultrasound beamforming front-ends where cutoff frequency must track signal bandwidth. IC Role / Device Role / Timing Role: Gain-controlled integrator stage where VG adjusts effective RC time constant via transconductance scaling. Use Value: Achieves electronic cutoff tuning from 1 MHz to 30 MHz without changing passive components or PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MTX/NOPB | Linear-in-V gain law (not dB); 100 MHz BW; same pinout and supply specs. | Better suited for linear gain interpolation (e.g., digital pot emulation) rather than logarithmic AGC. | Select when system requires uniform ∆V/∆gain instead of constant dB/V control slope. |
| AD8367ARUZ | 500 MHz bandwidth; 45 dB range; requires external 5V supply for detector; different pinout. | Higher-frequency RF applications (up to 500 MHz) with integrated RMS detector for true power-based AGC. | Select when operating above 100 MHz or requiring on-chip envelope detection instead of external integrator. |
Compared with LMH6502MTX/NOPB, LMH6503MTX/NOPB trades logarithmic precision for linear interpolation fidelity, while AD8367ARUZ extends bandwidth and adds detector functionality at the cost of pin compatibility and higher supply complexity.
Availability
LMH6502MTX/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 lifecycle support, and RoHS-compliant packaging.
Supply support for LMH6502MTX/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 its high-performance analog portfolio. TI specializes in precision amplifiers, data converters, and interface ICs for industrial, automotive, and communications markets.
The LMH6502MTX/NOPB belongs to TI's LMH™ wideband amplifier family, engineered for demanding signal chain applications requiring high speed, low distortion, and accurate gain control-including broadcast video, test equipment, and medical imaging systems.
FAQ
What is the maximum supply voltage rating for LMH6502MTX/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6502MTX/NOPB is 12.6 V. Operating ratings specify a functional range of ±2.5 V to ±5 V (i.e., 5 V to 10 V total). Exceeding ±5 V risks parametric degradation or damage, especially under heavy load or elevated temperature. TI's datasheet DS200677 explicitly limits continuous operation to ≤±5 V for guaranteed performance and reliability.
Does LMH6502MTX/NOPB support true single-supply operation with 3.3V rails?
Yes, LMH6502MTX/NOPB supports single-supply operation down to 5 V total (e.g., 0 V and +5 V), but requires pin 11 (GND) to be biased at a virtual mid-rail (e.g., +2.5 V) using resistive dividers or active references. With 3.3 V total supply (0 V/+3.3 V), the VG range compresses to ~0.2×V+ −1 V to 0.2×V+ +1 V per Table 1, yielding only ~0.6 V–1.6 V usable control range-insufficient for full 70 dB attenuation. For 3.3 V systems, ±2.5 V split supply is strongly recommended.
What is the guaranteed gain matching tolerance for LMH6502MTX/NOPB across production lots?
LMH6502MTX/NOPB guarantees device-to-device gain matching within ±0.6 dB at maximum gain (VG = +2 V) across temperature and process variations. This specification is tested and binned during final test, ensuring consistent channel-to-channel gain in multi-VGA systems like phased-array ultrasound or multi-sensor video capture without per-unit calibration.
Can LMH6502MTX/NOPB drive a 50Ω transmission line directly?
LMH6502MTX/NOPB is characterized and stabilized for 100Ω loads, delivering ±3.2 V output swing and ±75 mA current. Driving 50Ω directly causes excessive current demand (exceeding ±80 mA absolute max) and may degrade phase margin, leading to peaking or oscillation above 400 MHz. TI recommends adding a series 50Ω resistor at the output (making it effectively a 100Ω source) or using an external buffer stage for true 50Ω line driving.
Is LMH6502MTX/NOPB pin-compatible with CLC520?
Yes, LMH6502MTX/NOPB is a direct replacement for CLC520, sharing identical pinout, supply requirements, and functional behavior. TI's datasheet explicitly states "Replacement for CLC520" in the Applications section and confirms SOIC-14/TSSOP-14 package compatibility. No PCB changes are required when upgrading from CLC520 to LMH6502MTX/NOPB, though layout optimization per TI's evaluation board CLC730146 is advised for best high-frequency performance.
LMH6502MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
LMH6502MTX/NOPB FAQ
1.How can I place an order for LMH6502MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6502MTX/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 LMH6502MTX/NOPB reliable?
The price and inventory of LMH6502MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6502MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6502MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6502MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6502MTX/NOPB?
LMH6502MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6502MTX/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 LMH6502MTX/NOPB?
For technical support, including LMH6502MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6502MTX/NOPB requirements.
6.How does Aetrix verify that LMH6502MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6502MTX/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 LMH6502MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6502MTX/NOPB?
All LMH6502MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6502MTX/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 LMH6502MTX/NOPB part is unused and in its original packaging.
Return procedure for LMH6502MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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