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Texas Instruments LMH6502MT/NOPB
- Part No.:
- LMH6502MT/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6502MT/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
LMH6502MT/NOPB from Texas Instruments (formerly National Semiconductor) is a wideband, linear-in-dB variable gain amplifier (VGA) with differential voltage-controlled gain stage followed by a high-speed current-feedback op amp. It delivers 70 dB gain adjustment range up to 10 MHz, −3 dB bandwidth of 130 MHz, slew rate of 1800 V/µs, and supports ±75 mA output drive into 100 Ω - ideal for AGC loops in video imaging and RF signal conditioning.
For engineers reviewing the LMH6502MT/NOPB datasheet, LMH6502MT/NOPB pinout, LMH6502MT/NOPB application, or LMH6502MT/NOPB equivalent, key selection criteria include guaranteed gain matching (±0.6 dB), low output offset (<350 mV over full VG range), linear-in-dB control architecture, and TSSOP-14 package compatibility with high-frequency layout requirements.
Technical Context
The LMH6502MT/NOPB implements a differential input transconductance stage where gain is controlled by a voltage (VG) applied to Pin 2, biasing matched transistor pair Q1/Q2 to steer signal current through RF. Its current-feedback output stage enables large-signal bandwidth preservation and robust drive capability without sacrificing stability into 100 Ω loads.
Gain control is linear-in-dB across most of its 0–2 V VG range (referenced to Pin 11), enabling precise logarithmic compression for automatic gain control. Device-to-device gain matching is tested and guaranteed at ±0.6 dB at maximum gain, and output-referred DC offset remains under ±380 mV across temperature (−40°C to +85°C) and supply (±5 V to ±2.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz - supports high-definition video baseband and IF signal paths up to 100 MHz without roll-off. |
| Gain Adjustment Range | 72 dB at f < 10 MHz - enables wide dynamic range compression in AGC systems with minimal distortion. |
| Slew Rate | 1800 V/µs - ensures faithful reproduction of fast-rising video sync pulses and digital modulation envelopes. |
| Output Drive Current | ±75 mA into 100 Ω - directly drives coaxial cables, ADC inputs, or downstream buffers without external gain staging. |
| Input Voltage Noise | 7.7 nV/√Hz - maintains SNR integrity in low-level analog front-ends such as medical imaging or radar receivers. |
| THD @ 20 MHz | −53 dBc - meets broadcast-grade video linearity requirements for composite and component signals. |
| Supply Current | 27 mA (no load, ±5 V) - balances performance and power efficiency in portable or thermally constrained designs. |
Pinout & Package
TSSOP-14 package (NS Package Number MTC14), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant / NOPB finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internal die pad; must remain unconnected per TI design guidelines. |
| 2 (VG) | Gain Control Voltage Input | 0–2 V referenced to Pin 11; sets linear-in-dB gain; bias current ≤300 µA at 0 V. |
| 3 (+IN) | Differential Input Non-Inverting | High-impedance buffered input (750 kΩ || 5 pF); common-mode range ±2.2 V. |
| 4 (RG1) | Input Gain Resistor Terminal | Connects to one end of RG; sets max gain with RF; current ≤2.22 mA. |
| 5 (RG2) | Input Gain Resistor Terminal | Connects to other end of RG; completes transconductance input stage. |
| 6 (−IN) | Differential Input Inverting | Matched to Pin 3; enables CMRR >72 dB for noise rejection in long-line applications. |
| 7 (V−) | Negative Supply Rail | Accepts −2.5 V to −6 V; PSRR −40 dB typical; requires local 0.1 µF bypass. |
| 8 (OUT) | Current-Feedback Output | Drives 100 Ω directly; output swing ±3.2 V; stable with ≥10 pF capacitive load. |
| 9 (RF) | Feedback Resistor Terminal | Connects to RF (typically 1 kΩ); sets closed-loop gain and bandwidth of output stage. |
| 10 (NC) | No Connect | Internal test node; leave floating per TI layout recommendations. |
| 11 (GND) | Ground Reference | Reference for VG and VCM; tied to virtual half-supply in single-supply operation. |
| 12 (I−) | Inverting Summing Node | Sensitive to stray capacitance; minimize trace area; avoid ground plane under RG. |
| 13 (V+) | Positive Supply Rail | Accepts +2.5 V to +6 V; PSRR −45 dB typical; requires local 0.1 µF bypass. |
| 14 (NC) | No Connect | Internal die pad; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables accurate logarithmic compression for AGC without lookup tables or digital calibration. |
| Guaranteed gain matching | ±0.6 dB tolerance at max gain ensures consistent system-level gain across multiple channels. |
| DC-coupled differential input | Supports baseband video, ultrasound, and instrumentation signals without AC coupling artifacts. |
| Current-feedback output stage | Maintains 130 MHz bandwidth even with large output swings and heavy capacitive loads. |
| Single-supply compatible VG range | 0–2 V relative to Pin 11 allows seamless integration into 3.3 V or 5 V systems using virtual ground. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
|
Use Scenario: Amplifying NTSC/PAL composite video signals before digitization in broadcast encoders. IC Role / Device Role / Timing Role: VGA front-end providing programmable gain to maintain constant peak white level despite varying camera illumination. Use Value: 70 dB dynamic range and −53 dBc THD preserve luminance/chrominance fidelity while rejecting sync pulse distortion. |
Use Scenario: Stabilizing RF receiver output amplitude across fading multipath conditions in wireless infrastructure. IC Role / Device Role / Timing Role: Core gain-control element in closed-loop analog AGC, responding to envelope-detected output voltage. Use Value: Linear-in-dB response ensures predictable loop gain and avoids log-domain instability; 100 MHz gain-control BW supports fast channel adaptation. |
| Variable Attenuator | Voltage-Controlled Filter |
|
Use Scenario: Precision attenuation of sensor outputs in industrial process monitoring systems with 4–20 mA interfaces. IC Role / Device Role / Timing Role: Digitally programmed attenuator replacing mechanical potentiometers or relay-switched resistor networks. Use Value: 0.1 dB flat-band attenuation resolution (7.5 dB range) enables fine-grained calibration without microcontroller intervention. |
Use Scenario: Tuning cutoff frequency of active filter stages in software-defined radio (SDR) receive chains. IC Role / Device Role / Timing Role: Gain-adjustable integrator stage controlling Q-factor and center frequency via VG-modulated transconductance. Use Value: Differential input rejects common-mode noise from mixed-signal PCBs; 130 MHz bandwidth supports multi-MHz filter tuning agility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MT/NOPB | Linear-in-V gain control (not linear-in-dB); 60 dB range; lower THD (−65 dBc @ 20 MHz). | Better suited for precision instrumentation requiring linear gain scaling, not logarithmic compression. | Select LMH6503MT/NOPB when gain must scale linearly with control voltage and harmonic distortion is critical. |
| AD8367ARUZ | 500 MHz bandwidth; 45 dB gain range; integrated RMS detector; requires external decoupling for stability. | Designed for RF/IF AGC in 400–2500 MHz bands; not optimized for baseband video or DC-coupled use. | Choose AD8367ARUZ for wideband RF receiver gain control where GHz-range bandwidth outweighs DC coupling needs. |
Compared with LMH6502MT/NOPB, LMH6503MT/NOPB trades logarithmic control linearity for improved THD and linear scaling, while AD8367ARUZ shifts focus to RF frequencies and integrated detection-neither offers identical DC-coupled, linear-in-dB behavior with 130 MHz baseband bandwidth.
Availability
LMH6502MT/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 LMH6502MT/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 LMH6502MT/NOPB belongs to TI's LMH™ high-speed amplifier family, engineered for wideband signal conditioning in broadcast video, test equipment, and communications infrastructure where precision gain control and low distortion are essential.
FAQ
What is the guaranteed gain matching specification for LMH6502MT/NOPB?
The LMH6502MT/NOPB guarantees device-to-device gain matching within ±0.6 dB at maximum gain (AVMAX), as tested and specified in the Electrical Characteristics table. This tolerance holds across the full operating temperature range (−40°C to +85°C) and applies to all units shipped under this part number, ensuring consistent channel-to-channel performance in multi-path systems without post-calibration trimming.
Can LMH6502MT/NOPB operate from a single 5 V supply?
Yes, the LMH6502MT/NOPB supports single-supply operation: tie Pin 11 (GND) to a virtual ground at 2.5 V (e.g., via resistor divider + bypass capacitor), set VG between 0 V and +2 V relative to that reference, and bias differential inputs accordingly. The datasheet confirms functionality down to ±2.5 V total supply (5 V), with verified performance in gain vs. VG, CMRR, and PSRR plots - though max gain reduces slightly versus ±5 V operation.
What is the maximum load capacitance LMH6502MT/NOPB can drive stably?
The LMH6502MT/NOPB is fully stable driving a purely resistive 100 Ω load. With capacitive loading, stability degrades above ~10 pF directly on Pin 8 (OUT). For loads exceeding 10 pF (e.g., PCB traces, connectors, or ADC input capacitance), TI recommends adding a 10–22 Ω series resistor between Pin 8 and the load to isolate capacitance - or using a snubber (e.g., 100 Ω + 39 pF to ground) as documented in the Application Information section.
Does LMH6502MT/NOPB require external components to set gain?
Yes, LMH6502MT/NOPB requires two external resistors: RG (between Pins 4 and 5) sets input transconductance and max gain, while RF (between Pins 9 and 8) sets output stage gain and bandwidth. TI specifies optimal RF = 1 kΩ for best performance; RG is calculated based on desired AVMAX and input signal swing per Equation (1) in the datasheet. No internal gain-setting circuitry exists - all gain configuration is resistor-determined.
Is LMH6502MT/NOPB pin-compatible with LMH6502MA/NOPB?
No, LMH6502MT/NOPB (TSSOP-14) and LMH6502MA/NOPB (SOIC-14) share identical electrical functionality and pin functions, but differ in physical dimensions, thermal resistance (θJA = 160°C/W vs. 138°C/W), and PCB footprint. They are not mechanically interchangeable - board layout must be redesigned to accommodate the smaller TSSOP body (5.0 × 4.4 mm) and finer 0.65 mm pitch versus SOIC's 8.65 × 3.91 mm and 1.27 mm pitch.
LMH6502MT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
LMH6502MT/NOPB FAQ
1.How can I place an order for LMH6502MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6502MT/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 LMH6502MT/NOPB reliable?
The price and inventory of LMH6502MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6502MT/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6502MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6502MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6502MT/NOPB?
LMH6502MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6502MT/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 LMH6502MT/NOPB?
For technical support, including LMH6502MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6502MT/NOPB requirements.
6.How does Aetrix verify that LMH6502MT/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6502MT/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 LMH6502MT/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6502MT/NOPB?
All LMH6502MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6502MT/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 LMH6502MT/NOPB part is unused and in its original packaging.
Return procedure for LMH6502MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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