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Texas Instruments LMH6502MT
- Part No.:
- LMH6502MT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6502MT.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
LMH6502MT 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 130MHz −3dB bandwidth, 70dB gain adjustment range up to 10MHz, and ±75mA linear output current-enabling precise analog gain control in video imaging, AGC loops, and RF signal conditioning systems.
For engineers reviewing the LMH6502MT datasheet, LMH6502MT pinout, LMH6502MT application, or LMH6502MT equivalent, key selection criteria include its linear-in-dB gain law, low 350mV max output offset over full VG range, ±0.6dB device-to-device gain matching at maximum gain, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The LMH6502MT implements a differential input transconductance stage where gain is controlled by a 0V–+2V voltage applied to pin 2 (VG), biasing matched transistor pair Q1/Q2 to steer signal current through RF. Its output stage uses a current-feedback op amp architecture, enabling 1800V/µs slew rate and stable driving of 100Ω loads without external compensation.
Gain accuracy is guaranteed across temperature (−40°C to +85°C) and supply range (±2.5V to ±5V), with tested tolerance at each VG setting and K-factor calibration (1.58–1.91 V/V) for predictable dB-per-volt response. Input common-mode rejection exceeds 72dB, and feed-through isolation reaches −47dB at 30MHz when VG = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 130MHz - supports high-definition video and broadband IF signal paths without roll-off |
| Slew Rate | 1800V/µs - enables faithful reproduction of fast transient signals up to ~100MHz |
| Gain Adjustment Range | 72dB @ f < 10MHz - provides wide dynamic range for automatic gain control in varying signal environments |
| Output Current | ±75mA - drives 100Ω loads directly, eliminating need for external buffer stages |
| Input Voltage Noise | 7.7nV/√Hz - ensures minimal SNR degradation in low-level signal amplification |
| Supply Current | 27mA (no load) - balances speed and power efficiency for portable or thermally constrained designs |
| Gain Matching | ±0.6dB @ VG = 2.0V - guarantees consistent system gain across multiple channels or boards |
| Output Offset Voltage | ±380mV max over 0V–2V VG range - limits DC error accumulation in cascaded analog signal chains |
Pinout & Package
The LMH6502MT is housed in a 14-pin TSSOP package (NSC drawing MTC14), 5.0mm × 6.4mm body size, 0.65mm pitch, with exposed thermal pad (not electrically connected). Pin 11 serves as ground reference for VG and internal bias networks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | V− / V+ | Negative/positive supply rails; supports ±2.5V to ±5V operation |
| 2 | VG | Gain control voltage input (0V to +2V relative to pin 11); sets logarithmic gain |
| 3, 6 | +VIN / −VIN | Differential input terminals; 750kΩ input resistance, ±0.12V max differential input |
| 4, 5 | +RG / −RG | External gain-setting resistor connections; define AVMAX via RG value |
| 7 | NC | No connect - must be left floating per datasheet |
| 8 | −RF | Inverting feedback node for output stage; connects to external RF (typically 1kΩ) |
| 9 | +RF | Non-inverting feedback node; ties to RF and output (pin 10) |
| 10 | VOUT | Single-ended output; capable of ±3.2V swing into 100Ω |
| 11 | GND | Ground reference for VG, internal bias, and CM level; critical for single-supply virtual ground setup |
| 12 | I− | Current-sink node for input stage; sensitive to stray capacitance - minimize trace area |
| 13 | I+ | Current-source node for input stage; complements I− in differential current steering |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain law | Enables precise, predictable AGC response without digital lookup tables or calibration |
| Differential input architecture | Provides >55dB CMRR, rejecting noise on long cables or in mixed-signal PCB environments |
| Current-feedback output stage | Delivers 130MHz bandwidth and 1800V/µs slew rate independent of closed-loop gain |
| Guaranteed gain tolerance | Gain at any VG is production-tested - eliminates post-layout gain trimming in volume manufacturing |
| TSSOP-14 thermal performance | θJA = 160°C/W enables sustained 300mW operation in compact industrial enclosures |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying composite video or RGB signals prior to ADC sampling in broadcast equipment or medical endoscopes. IC Role / Device Role / Timing Role: VGA front-end providing programmable gain to maintain constant signal amplitude despite varying scene brightness or sensor sensitivity. Use Value: 0.34% differential gain and 0.10° differential phase errors preserve color fidelity; 70dB range accommodates 40dB+ input dynamic range. | Use Scenario: Closed-loop gain stabilization in RF receiver IF stages or optical transceiver analog front ends. IC Role / Device Role / Timing Role: Core gain-control element whose linear-in-dB response matches logarithmic detector outputs for stable loop convergence. Use Value: Guaranteed ±0.6dB gain matching across units ensures consistent AGC threshold behavior in multi-channel systems. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision signal level adjustment in test instrumentation, such as programmable attenuators in signal generators or spectrum analyzers. IC Role / Device Role / Timing Role: Digitally controlled analog attenuator replacing mechanical or relay-based solutions for faster, wear-free adjustment. Use Value: 72dB attenuation range with flat ±0.2dB bandwidth up to 30MHz enables calibrated stepless level control across HF/VHF bands. | Use Scenario: Tunable low-pass or band-pass filtering in software-defined radio (SDR) receive paths or adaptive equalizers. IC Role / Device Role / Timing Role: Gain-variable stage embedded in active filter topologies (e.g., biquad) to adjust cutoff frequency or Q factor dynamically. Use Value: 100MHz gain-control bandwidth ensures filter response tracks VG changes without phase lag or settling delay. |
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 | Linear (not logarithmic) gain control law; identical pinout and bandwidth (130MHz) | Better suited for digitally controlled linear gain scaling (e.g., DSP-based beamforming), not AGC | Select LMH6503MT only when gain vs. control voltage must be linear, not dB-linear |
| AD8367ARUZ | 500MHz bandwidth, 45dB range, requires external 5V supply for control interface; different pinout | Higher-frequency IF/RF applications (e.g., cellular baseband), but lacks DC coupling and differential inputs | Choose AD8367ARUZ for >200MHz signal paths where LMH6502MT's 130MHz limit is insufficient |
Compared with LMH6502MT, LMH6503MT offers identical packaging and speed but replaces logarithmic gain with linear control-making it unsuitable for true AGC-but superior for precision linear scaling. AD8367ARUZ extends bandwidth significantly but sacrifices DC coupling, differential input capability, and integrated current-feedback drive strength.
Availability
LMH6502MT is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control circuits, and variable attenuator designs requiring stable component supply, guaranteed gain matching, and TSSOP-14 footprint compatibility.
Supply support for LMH6502MT 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 support, documentation, and manufacturing continuity for legacy high-performance analog products.
The LMH6502MT belongs to TI's LMH™ high-speed amplifier family, designed specifically for wideband analog signal conditioning in video, communications, and test equipment where precision gain control, low distortion, and DC-coupled operation are essential.
FAQ
What is the maximum supply voltage rating for the LMH6502MT?
The LMH6502MT has an absolute maximum supply voltage rating of ±6.3V (12.6V total), but its specified operating range is ±2.5V to ±5V. Operation at ±5V delivers full performance including 130MHz bandwidth and ±75mA output current. At ±2.5V, bandwidth reduces slightly and VG range shifts downward per Table 1 in the datasheet; exceeding ±6.3V risks permanent damage.
Does the LMH6502MT support single-supply operation?
Yes, the LMH6502MT supports single-supply operation by tying pin 11 (GND) to a virtual mid-rail voltage (e.g., V+/2 using resistive divider or op-amp buffer). The VG input range becomes 0V to +2V relative to this mid-rail, enabling use with +5V or +10V supplies. Input common-mode range remains ±1.7V around mid-rail, and output swings to within ~0.8V of each rail.
What is the purpose of pins 4 and 5 (±RG) on the LMH6502MT?
Pins 4 and 5 are the ±RG terminals that connect to an external resistor defining the maximum gain (AVMAX) of the LMH6502MT. RG sets the transconductance scaling factor: lower RG yields higher AVMAX. The recommended value is 174Ω for AVMAX = 10V/V. These pins must be terminated symmetrically; mismatched RG values degrade common-mode rejection and gain linearity.
How does gain matching work across multiple LMH6502MT units?
LMH6502MT units are tested during production for gain matching at VG = 2.0V, guaranteeing ≤±0.6dB variation between devices. This tolerance holds across temperature (−40°C to +85°C) and applies to the entire gain control curve-not just maximum gain-ensuring consistent channel-to-channel tracking in multi-path systems like phased-array receivers or multi-camera video processors.
Can the LMH6502MT drive a 50Ω load directly?
The LMH6502MT is fully stable driving a 100Ω load, but driving 50Ω directly may cause peaking or instability above 400MHz due to reduced phase margin. For 50Ω applications, TI recommends adding a 10Ω series resistor at pin 10 (VOUT) to isolate parasitic capacitance, or using a snubber (e.g., 100Ω + 39pF to ground). Output swing into 50Ω drops to ±2.5V typical, versus ±3.2V into 100Ω.
LMH6502MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LMH6502MT FAQ
1.How can I place an order for LMH6502MT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6502MT 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 reliable?
The price and inventory of LMH6502MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6502MT is usually 5 days.
3.What payment methods are accepted for LMH6502MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6502MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6502MT?
LMH6502MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6502MT 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?
For technical support, including LMH6502MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6502MT requirements.
6.How does Aetrix verify that LMH6502MT is sourced from the original manufacturer or authorized distributors?
All LMH6502MT 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 meets industry standards.
7.What is the process for return or replacement of LMH6502MT?
All LMH6502MT units undergo pre-shipment inspection (PSI). If there is an issue with LMH6502MT, 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 part is unused and in its original packaging.
Return procedure for LMH6502MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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