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Texas Instruments LMH6505MA/NOPB
- Part No.:
- LMH6505MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6505MA/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
LMH6505MA/NOPB from Texas Instruments is a wideband, linear-in-dB variable gain amplifier (VGA) with 150 MHz −3 dB bandwidth, 80 dB gain control range (f < 10 MHz), and ±0.50 dB gain matching at maximum gain. It features current-feedback output stage enabling 1500 V/μs slew rate in inverting configuration and ±60 mA linear output current, suited for AGC loops in video imaging and RF signal conditioning.
For engineers reviewing the LMH6505MA/NOPB datasheet, LMH6505MA/NOPB pinout, LMH6505MA/NOPB application, or LMH6505MA/NOPB equivalent, key selection considerations include its linear-in-dB transfer function over 0–2 V VG input, resistor-programmable AVMAX (2–100 V/V), low 4.4 nV/√Hz input noise, and dual-supply (±3.5 V to ±6 V) or single-supply operation with virtual ground biasing.
Technical Context
The LMH6505MA/NOPB integrates a transconductance input buffer, voltage-controlled multiplier cell, and current-feedback output amplifier (CFA). Its gain is set by external RF and RG resistors per AVMAX = K·RF/RG (K = 0.940 typ), while VG (0–2 V) controls attenuation linearly in dB across 80 dB range below AVMAX.
Gain control bandwidth reaches 100 MHz at VG = 1 V, and feed-through remains ≤−51 dB at 30 MHz when VG = 0 V. The device maintains ±0.50 dB gain matching across units at AVMAX and exhibits <±55 mV output offset voltage over full VG range (0–2 V) and temperature (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports high-frequency video and IF signal paths up to 150 MHz with <1 dB gain loss. |
| Gain Control Range | 80 dB (f < 10 MHz) - enables precise automatic gain control over 10,000× amplitude ratio without digital control. |
| Slew Rate (Inverting) | 1500 V/μs - delivers fast large-signal response for pulse and transient-rich waveforms without distortion. |
| Input Noise Voltage | 4.4 nV/√Hz - ensures minimal added noise in low-level analog signal chains such as receiver front-ends. |
| Supply Current (No Load) | 11 mA - achieves wide bandwidth and high linearity at only 110 mW total power (±5 V). |
| Output Voltage Swing | ±2.4 V (RL = 100 Ω) - drives standard 50–100 Ω loads directly with >4.8 VPP peak-to-peak swing. |
| Gain Matching Limit | ±0.50 dB at AVMAX - guarantees consistent channel-to-channel gain in multi-path systems without calibration. |
Pinout & Package
LMH6505MA/NOPB is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard 1.27 mm pitch, RoHS-compliant, and rated for −40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VG | Gain Control Input | High-impedance (25 MΩ) analog voltage input (0–2 V) that sets gain linearly in dB; referenced to GND (pin 4). |
| 2 - VIN | Inverting Input | Main signal input node; accepts ±0.6 V (RG = 100 Ω) or ±3 V (RG open); low bias current (−2.5 µA typ) minimizes loading. |
| 3 - RG | Gain Setting Resistor Terminal | Connects external RG to set transconductance stage gain; DC current through RG affects gain stability at low VG. |
| 4 - GND | Ground Reference | Signal and supply reference point; used as VG reference and virtual ground in single-supply configurations. |
| 5 - V+ | Positive Supply | Accepts +3.5 V to +6 V in dual-supply mode; must be ≥|V−| for proper CFA biasing and output swing. |
| 6 - VOUT | Output | Current-feedback amplifier output; drives 100 Ω loads to ±2.4 V with ±60 mA linear current capability. |
| 7 - V− | Negative Supply | Accepts −3.5 V to −6 V in dual-supply mode; supplies CFA bias and enables rail-to-rail output swing symmetry. |
| 8 - X1 | Non-Inverting Input | Internally connected to input buffer output; not user-accessible-used only for internal feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB Gain Control | VG (0–2 V) produces near-linear dB gain change over 80 dB range-ideal for analog AGC without log amps or DACs. |
| Resistor-Programmable AVMAX | AVMAX = 0.94·RF/RG allows flexible gain setting from 2 V/V to 100 V/V using standard resistors-no trimming required. |
| High-Speed Current-Feedback Output | 1500 V/μs slew rate and 150 MHz bandwidth enable fidelity preservation in fast-switching video and IF applications. |
| Low Input Noise | 4.4 nV/√Hz input-referred voltage noise and 2.6 pA/√Hz current noise support high-SNR signal conditioning. |
| Single-Supply Compatibility | VG referenced to GND (pin 4) and wide input/output voltage ranges allow operation from +7 V to +12 V with virtual ground bias. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
|
Use Scenario: Real-time analog gain adjustment in broadcast-grade CCD/CMOS camera signal chains before ADC sampling. IC Role / Device Role / Timing Role: VGA core providing programmable, linear-in-dB gain scaling of baseband video signals (DC–30 MHz). Use Value: Maintains constant output amplitude despite varying scene illumination, leveraging 80 dB dynamic range and ±0.50 dB unit-to-unit matching. |
Use Scenario: Closed-loop RF/IF receiver front-end where signal strength varies widely (e.g., cellular base station LNA control). IC Role / Device Role / Timing Role: Analog gain element in feedback loop with RMS detector and op-amp integrator controlling VG voltage. Use Value: Eliminates need for digital control loop; 100 MHz gain control BW enables fast settling (<10 ns step response) for burst-mode signals. |
| Variable Attenuator | Voltage-Controlled Filter |
|
Use Scenario: Precision analog attenuation in test equipment (e.g., signal generator output stage) requiring smooth, repeatable level control. IC Role / Device Role / Timing Role: Continuously adjustable attenuator with 0.1 dB resolution via analog VG sweep (0–2 V). Use Value: Delivers flat frequency response (±0.2 dB up to 30 MHz) and <−51 dB feed-through at cutoff-superior to switched-resistor networks. |
Use Scenario: Tunable low-pass or band-pass filter in software-defined radio (SDR) front-ends where cutoff frequency must track signal bandwidth. IC Role / Device Role / Timing Role: Gain-controllable stage cascaded with fixed RC network to modulate effective Q and roll-off slope. Use Value: Enables analog reconfiguration of filter shape without switching components-reducing EMI and layout complexity. |
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/V gain control (not linear-in-dB); 100 MHz BW; same pinout and supply specs. | Better suited for digitally controlled gain where linear voltage mapping is preferred over logarithmic compression. | Select LMH6503MA/NOPB when system requires direct proportional VG-to-gain relationship rather than dB-linear AGC behavior. |
| AD8370ACPZ-R7 | 500 MHz BW; 5.5 V supply max; differential input; 24-lead LFCSP; 0.5 dB gain matching. | Targets higher-frequency IF stages (up to 500 MHz) and differential signaling; requires PCB redesign and layout optimization. | Choose AD8370ACPZ-R7 only when >150 MHz bandwidth or differential interface is mandatory-LMH6505MA/NOPB offers lower cost and simpler layout. |
Compared with LMH6505MA/NOPB, LMH6503MA/NOPB provides linear voltage gain control ideal for precision instrumentation, while AD8370ACPZ-R7 extends bandwidth and adds differential capability at the cost of package size and design complexity-LMH6505MA/NOPB remains optimal for cost-sensitive, single-ended, linear-in-dB AGC designs up to 150 MHz.
Availability
LMH6505MA/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 availability, and guaranteed RoHS compliance.
Supply support for LMH6505MA/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 and embedded processing technologies, with decades of expertise in high-speed amplifiers and signal chain solutions.
The LMH6505MA/NOPB belongs to TI's LMH high-speed amplifier family, designed specifically for wideband analog gain control in video, communications, and test equipment where linear-in-dB response, low noise, and fast settling are critical.
FAQ
What is the maximum recommended supply voltage for LMH6505MA/NOPB?
The LMH6505MA/NOPB has an absolute maximum supply voltage rating of ±6.3 V (12.6 V total), but the recommended operating range is ±3.5 V to ±6 V. Operating at ±5 V delivers optimal performance: 150 MHz bandwidth, 11 mA supply current, and ±2.4 V output swing into 100 Ω. Exceeding ±6 V risks permanent damage per Absolute Maximum Ratings.
How does LMH6505MA/NOPB achieve linear-in-dB gain control?
The LMH6505MA/NOPB implements linear-in-dB gain control via an internal hyperbolic tangent multiplier architecture. With VG applied to pin 1 (0–2 V), gain follows A(V/V) = K·RF/RG·tanh[(N − VG)/VC], yielding near-linear dB response over 80 dB. This eliminates need for external log amps or digital compensation in AGC loops.
Can LMH6505MA/NOPB operate from a single supply?
Yes. LMH6505MA/NOPB supports single-supply operation by biasing pin 4 (GND) to a stable virtual ground (e.g., VCC/2), tying RG to that node, and referencing VG to it. Input (pin 2) must remain within 2 V of the virtual ground, and output centers there-enabling +7 V to +12 V operation without split rails.
What is the purpose of the X1 pin (pin 8) on LMH6505MA/NOPB?
Pin 8 (X1) is the non-inverting input of the internal current-feedback amplifier stage and is not externally accessible. It connects internally to the output of the transconductance input buffer and serves only as a dedicated feedback node-users must not connect external components to X1.
Does LMH6505MA/NOPB require external compensation components?
No. LMH6505MA/NOPB is internally compensated and stable with standard RF and RG configurations. Bandwidth is set solely by RF (e.g., 1 kΩ yields 150 MHz), and no external capacitors or resistors beyond RG and RF are needed for basic operation-simplifying layout and reducing BOM count.
LMH6505MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1500V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 600 nA
- Voltage - Input Offset:
- -
- Current - Supply:
- 11mA
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMH6505MA/NOPB FAQ
1.How can I place an order for LMH6505MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MA/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 LMH6505MA/NOPB reliable?
The price and inventory of LMH6505MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6505MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MA/NOPB?
LMH6505MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MA/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 LMH6505MA/NOPB?
For technical support, including LMH6505MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MA/NOPB requirements.
6.How does Aetrix verify that LMH6505MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6505MA/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 LMH6505MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6505MA/NOPB?
All LMH6505MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MA/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 LMH6505MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6505MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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