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Texas Instruments LMH6505MAX
- Part No.:
- LMH6505MAX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6505MAX.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
LMH6505MAX from Texas Instruments is a wideband, low-power, linear-in-dB variable gain amplifier (VGA) featuring 150 MHz −3 dB bandwidth, 100 MHz gain control bandwidth, and 80 dB attenuation range (<10 MHz). It integrates a transconductance input stage, voltage-controlled multiplier, and current-feedback output amplifier - enabling precise AGC in RF/IF signal chains, video imaging, and high-speed instrumentation.
For engineers reviewing the LMH6505MAX datasheet, LMH6505MAX pinout, LMH6505MAX application, or LMH6505MAX equivalent, this page delivers verified specifications, SOIC-8 package details, real-world use scenarios, and two validated alternative VGAs - all grounded in TI's SNOSAT4E datasheet (Rev. April 2013) and official electrical characteristics tables.
Technical Context
The LMH6505MAX implements a three-stage architecture: a high-impedance transconductance input buffer (pin 2, RG-dependent), a linear-in-dB analog multiplier controlled by VG (pin 1), and a current-feedback op amp output stage (pins 6/7) with 1500 V/μs slew rate in inverting configuration. Gain is set by external RF/RG ratio and scaled by K = 0.940 nominal.
Its gain control is hyperbolic tangent-based, delivering ±0.50 dB gain matching at AVMAX and <±0.2 dB flatness over 26 dB range below 30 MHz. Input bias current is −2.5 µA (typ), input resistance is 7 MΩ, and VG input impedance exceeds 25 MΩ - enabling direct DAC or filter-driven control without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports full-scale video (HD/SD), IF sampling up to 75 MHz, and broadband test equipment front-ends. |
| Gain Control Bandwidth | 100 MHz - enables fast AGC loop closure for pulsed RF, radar, or burst-mode communication systems. |
| Attenuation Range | 80 dB (<10 MHz) - sufficient for dynamic range compression in spectrum analyzers and automatic level control in CATV line drivers. |
| Slew Rate (Inverting) | 1500 V/μs - sustains 4 VPP large-signal integrity at 20 MHz without slewing distortion. |
| Supply Current | 11 mA (no load) - enables low-power portable instrumentation and battery-backed signal conditioning modules. |
| Input Noise Density | 4.4 nV/√Hz - maintains SNR > 68 dB for 10 MHz baseband signals with 100 Ω source impedance. |
| Output Drive | ±60 mA - directly drives 50 Ω transmission lines, ADC input buffers, or coaxial cable loads without external buffering. |
Pinout & Package
LMH6505MAX is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.27 mm pitch). Thermal resistance θJA = 165°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Voltage Input | High-impedance (25 MΩ) node accepting 0–2 V relative to GND (pin 4); sets gain linearly in dB across 80 dB range. |
| 2 (VIN) | Inverting Input | Transconductance input with ±3 V common-mode range; accepts DC-coupled or AC-coupled signals with minimal offset shift. |
| 3 (RG) | Gain Setting Resistor Terminal | DC current path defining input transconductance; RG = 100 Ω sets ±0.6 V input range and 9.4 V/V max gain. |
| 4 (GND) | Analog Ground Reference | Signal and supply reference for single-supply operation; must be tied to virtual mid-rail when using unipolar supplies. |
| 5 (V+) | Positive Supply | Accepts +3.5 V to +6 V (±5 V typical); PSRR > 65 dB ensures immunity to supply ripple in mixed-signal systems. |
| 6 (VOUT) | Output | Current-feedback amplifier output; delivers ±2.4 V swing into 100 Ω and ±60 mA continuous current. |
| 7 (V−) | Negative Supply | Accepts −3.5 V to −6 V (±5 V typical); symmetric supply enables true bipolar signal handling and rail-to-rail output swing. |
| 8 (X1) | Non-inverting Input / Buffer Output | Internal node accessible for feedback or monitoring; not intended for external connection in standard configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | 80 dB range with <±0.2 dB flatness up to 30 MHz - eliminates logarithmic conversion circuitry in AGC loops. |
| Resistor-programmable AVMAX | Set via RF/RG ratio (e.g., RF = 1 kΩ, RG = 100 Ω → 9.4 V/V); K = 0.940 accounts for process variation. |
| Low distortion at 20 MHz | THD = −45 dBc (2 VPP, RL = 100 Ω) - preserves fidelity in video processing and high-fidelity IF amplification. |
| Wide temperature stability | Gain matching ±0.50 dB over −40°C to +85°C - ensures consistent performance in industrial and automotive environments. |
| Single-supply compatibility | GND pin (4) serves as virtual mid-rail reference; VG input referenced to GND enables 0–2 V control from 3.3 V logic. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Real-time gain adjustment of composite video signals in broadcast encoders and medical ultrasound beamformers. IC Role / Device Role / Timing Role: VGA core providing DC-coupled, wideband gain scaling with <1% gain error across 0–2 V VG sweep. Use Value: Maintains constant output amplitude despite varying sensor sensitivity or cable loss - eliminating manual calibration and enabling plug-and-play camera modules. |
Use Scenario: Closed-loop RF receiver front-end where signal strength varies >60 dB (e.g., cellular base stations, spectrum analyzers). IC Role / Device Role / Timing Role: Primary gain-control element with 100 MHz control bandwidth, interfacing directly to RMS detector and DAC. Use Value: Enables sub-µs AGC response time while preserving signal integrity - critical for burst-mode LTE/NR and radar pulse detection. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision programmable attenuator in automated test equipment (ATE) for calibrating signal generator outputs. IC Role / Device Role / Timing Role: Digitally controlled analog attenuator replacing relay-based or PIN diode solutions. Use Value: Delivers 80 dB dynamic range with monotonic, repeatable step response - reducing calibration overhead and improving test repeatability. |
Use Scenario: Tunable low-pass or band-pass filter in software-defined radio (SDR) receivers, where cutoff frequency is dynamically adjusted. IC Role / Device Role / Timing Role: Gain-controllable integrator stage in active filter topologies (e.g., biquad, state-variable). Use Value: Enables real-time filter reconfiguration without changing passive components - supporting multi-standard wireless protocols in compact form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MAX | Linear-in-V/V gain control (not dB); 120 MHz BW; lower noise (3.9 nV/√Hz); no X1 pin access. | Better suited for linear gain interpolation (e.g., digital pot emulation), less ideal for logarithmic AGC loops. | Select LMH6503MAX when absolute linearity in voltage domain is required and dB-scale control is unnecessary. |
| AD8367ARUZ | 500 MHz BW; 45 dB range; requires external 5 V supply; higher supply current (25 mA); integrated RMS detector. | Targeted at RF/IF gain control above 100 MHz; includes on-chip detector for self-contained AGC. | Choose AD8367ARUZ for >200 MHz signal paths or when integrated detector simplifies system-level AGC design. |
Compared with LMH6505MAX, LMH6503MAX offers superior linearity for voltage-domain gain setting but lacks linear-in-dB response essential for wide-dynamic-range AGC, while AD8367ARUZ provides higher RF bandwidth and integrated detection at the cost of power and complexity - making LMH6505MAX optimal for 10–100 MHz video, instrumentation, and medium-speed communications.
Availability
LMH6505MAX is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control circuits, and voltage-controlled filter designs requiring stable component supply, long-term manufacturability, and guaranteed TI second-source availability.
Supply support for LMH6505MAX 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, embedded processing, and connectivity technologies - with over 50 years of innovation in high-speed amplifiers and precision signal chain solutions.
The LMH6505MAX belongs to TI's LMH high-speed amplifier family, designed specifically for wideband, low-distortion, and low-power variable gain applications in test & measurement, video infrastructure, and communications equipment.
FAQ
What is the maximum recommended supply voltage for LMH6505MAX?
The LMH6505MAX has an absolute maximum supply voltage rating of ±6.3 V (12.6 V total), but its specified operating range is ±3.5 V to ±6 V. For reliable long-term operation with full parameter guarantees, TI recommends ±5 V supplies - which deliver optimal bandwidth (150 MHz), distortion (−45 dBc), and thermal margin per the SNOSAT4E datasheet.
Can LMH6505MAX operate from a single 5 V supply?
Yes, LMH6505MAX supports single-supply operation: tie pin 4 (GND) to a stable virtual mid-rail (e.g., 2.5 V), bias VIN (pin 2) to that same voltage, and ensure VG (pin 1) swings from 0 V to 2 V relative to the mid-rail. This configuration maintains full 80 dB gain range and 150 MHz bandwidth - confirmed in TI's Application Information section (Figure 41).
What is the purpose of the X1 pin (pin 8) on LMH6505MAX?
Pin 8 (X1) is the internal non-inverting input of the LMH6505MAX's input transconductance stage - exposed for diagnostic or specialized feedback configurations. TI does not recommend connecting external circuitry to X1 in standard operation; it is primarily used internally and may affect stability or accuracy if improperly loaded per Figure 41 and Section "Other Configurations".
How does gain matching tolerance affect system-level calibration?
The LMH6505MAX guarantees ±0.50 dB device-to-device gain matching at maximum gain (AVMAX), meaning two units set to identical RF/RG and VG will differ by ≤0.5 dB. This tight matching reduces per-unit calibration effort in multi-channel systems (e.g., phased-array receivers or multi-sensor data acquisition), enabling factory trim only once per board rather than per channel.
Is LMH6505MAX suitable for driving 50 Ω transmission lines directly?
Yes - LMH6505MAX delivers ±60 mA output current and ±2.4 V swing into 100 Ω, and maintains >40 dB gain flatness up to 40 MHz into 50 Ω loads per TI's typical performance curves (Figure 6). For full 150 MHz bandwidth into 50 Ω, add a series 25 Ω resistor at the output to match characteristic impedance and minimize reflections - a practice validated in TI's evaluation board layout guidelines.
LMH6505MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LMH6505MAX FAQ
1.How can I place an order for LMH6505MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MAX 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 LMH6505MAX reliable?
The price and inventory of LMH6505MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MAX is usually 5 days.
3.What payment methods are accepted for LMH6505MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MAX?
LMH6505MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MAX 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 LMH6505MAX?
For technical support, including LMH6505MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MAX requirements.
6.How does Aetrix verify that LMH6505MAX is sourced from the original manufacturer or authorized distributors?
All LMH6505MAX 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 LMH6505MAX meets industry standards.
7.What is the process for return or replacement of LMH6505MAX?
All LMH6505MAX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MAX, 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 LMH6505MAX part is unused and in its original packaging.
Return procedure for LMH6505MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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