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Texas Instruments LMH6505MMX/NOPB
- Part No.:
- LMH6505MMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6505MMX/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
LMH6505MMX/NOPB from Texas Instruments is a wideband, linear-in-dB variable gain amplifier (VGA) with 150 MHz −3 dB bandwidth, 80 dB gain adjustment range (f < 10 MHz), and 100 MHz gain control bandwidth. It features current-feedback output stage enabling 1500 V/μs slew rate and ±60 mA linear output current, optimized for AGC loops in video imaging and RF signal conditioning.
For engineers reviewing the LMH6505MMX/NOPB datasheet, LMH6505MMX/NOPB pinout, LMH6505MMX/NOPB application, or LMH6505MMX/NOPB equivalent, this page delivers verified specifications, package-confirmed pin functions, real-world use cases in analog signal chains, and validated alternative parts for gain-control circuit design.
Technical Context
The LMH6505MMX/NOPB integrates a transconductance input buffer, voltage-controlled multiplier cell, and current-feedback amplifier (CFA) output stage. Its gain is set by external RF/RG resistor ratio (AVMAX = K·RF/RG, K = 0.940 typ), with VG input (0–2 V) controlling attenuation linearly in dB across 80 dB range.
It operates from ±3.5 V to ±6 V supplies (7–12 V total), supports single-supply operation via virtual ground biasing at pin 4 (GND), and maintains ±0.50 dB gain matching at maximum gain. Input bias current is −2.5 µA (typ), input resistance 7 MΩ, and VG input impedance 25 MΩ - enabling high-impedance control without loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports high-speed video, IF, and broadband analog signal paths up to 150 MHz with <1 dB flatness loss. |
| Gain Control Bandwidth | 100 MHz - enables fast AGC response to transient amplitude changes without phase lag in closed-loop systems. |
| Gain Adjustment Range | 80 dB (f < 10 MHz) - provides wide dynamic range control from full gain down to near-cutoff, critical for automatic level regulation. |
| Slew Rate (Inverting) | 1500 V/μs - ensures faithful reproduction of large-signal transients (e.g., video sync pulses, radar envelopes) without slew-induced distortion. |
| Supply Current (No Load) | 11 mA - achieves high speed and wide gain range at low quiescent power (110 mW @ ±5 V), suitable for power-sensitive instrumentation. |
| Input Noise Voltage | 4.4 nV/√Hz - preserves SNR in front-end amplification stages where low-noise gain control is essential (e.g., medical imaging, spectrum analyzers). |
| Output Voltage Swing | ±2.4 V (RL = 100 Ω) - delivers rail-to-rail compatible output drive into standard 50–100 Ω loads without clipping at moderate gains. |
Pinout & Package
LMH6505MMX/NOPB is packaged in an 8-pin VSSOP (DGK) - 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced for high-frequency operation. Pinout matches SOIC-8 but with reduced footprint and improved high-frequency parasitics.
| 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 pin 4 (GND). |
| 2 - VIN | Inverting Input | Main signal input node; supports ±0.74 V common-mode range with RG = 100 Ω; high-Z (7 MΩ) minimizes loading on source. |
| 3 - RG | Gain Setting Resistor Terminal | Connects external RG (e.g., 100 Ω) to set AVMAX; carries ±7.4 mA max DC current; determines input voltage range and distortion trade-offs. |
| 4 - GND | Ground Reference / Virtual Ground | Reference point for VG and RG bias; in single-supply designs, tied to "virtual half-supply" to center operating point. |
| 5 - V+ | Positive Supply | Accepts +3.5 V to +6 V; PSRR −72 dB (typ) ensures stable gain under supply ripple in mixed-signal systems. |
| 6 - VOUT | Output | Current-feedback amplifier output; drives ±60 mA into 100 Ω load; low output impedance (0.12 Ω) supports heavy capacitive loads. |
| 7 - V− | Negative Supply | Accepts −3.5 V to −6 V; −PSRR −75 dB (typ) suppresses negative rail noise coupling into gain path. |
| 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 ±0.50 dB device-to-device matching at AVMAX - simplifies AGC calibration and eliminates log-conversion circuitry. |
| Current-feedback output architecture | 1500 V/μs slew rate and 150 MHz bandwidth - enables high-fidelity amplification of fast video edges and wideband IF signals. |
| Wide supply range & single-supply support | 7–12 V total supply (±3.5 V to ±6 V); GND pin serves as virtual reference - allows integration into 5 V or 3.3 V systems with proper biasing. |
| Low input-referred noise | 4.4 nV/√Hz + 2.6 pA/√Hz - maintains signal integrity in cascaded gain stages where noise figure dominates system performance. |
| High-impedance VG and input terminals | 25 MΩ VG input resistance and 7 MΩ VIN resistance - reduces loading on DACs or precision references driving gain control. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
|
Use Scenario: Real-time brightness/contrast adjustment in broadcast cameras and medical ultrasound front-ends. IC Role / Device Role / Timing Role: VGA core dynamically scales analog video signal amplitude before ADC sampling to maximize SNR across varying scene illumination or tissue reflectivity. Use Value: 80 dB linear-in-dB range and 100 MHz gain control BW enable sub-microsecond gain updates synchronized to line or frame timing, eliminating visible gain stepping artifacts. |
Use Scenario: Stabilizing RF signal levels in receiver IF chains subject to fading or interference. IC Role / Device Role / Timing Role: Closed-loop gain controller where detector output feeds VG pin to maintain constant output amplitude despite input fluctuations. Use Value: ±0.50 dB gain matching and low 4.4 nV/√Hz noise ensure precise, repeatable loop convergence without introducing measurement error or degrading channel SNR. |
| Variable Attenuator | Voltage-Controlled Filter |
|
Use Scenario: Programmable signal conditioning in test equipment (e.g., signal generators, network analyzers). IC Role / Device Role / Timing Role: Precision analog attenuator replacing mechanical or switched-resistor networks; controlled via DAC-driven VG input. Use Value: 150 MHz bandwidth and 0.2 dB flatness over 26 dB range (f < 30 MHz) provide laboratory-grade amplitude accuracy without frequency-dependent droop. |
Use Scenario: Tunable low-pass or band-pass filtering in software-defined radio (SDR) front-ends. IC Role / Device Role / Timing Role: Gain-stage element in active filter topologies (e.g., biquad, state-variable), where VG adjusts cutoff frequency or Q factor. Use Value: Linear-in-dB response and wide 80 dB range allow smooth, monotonic filter parameter sweeps without harmonic distortion spikes seen in digital alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MMX/NOPB | Linear-in-V/V gain control (not linear-in-dB); 120 MHz BW; lower 60 dB gain range; requires external log amp for AGC. | Better suited for digitally controlled linear gain scaling (e.g., FPGA-driven step gain), not analog AGC loops. | Select when precise linear voltage-domain gain mapping is required, and logarithmic control is handled externally. |
| AD8367ARUZ | 500 MHz BW; 45 dB gain range; integrated RMS detector; 5 V single-supply only; higher 25 mA supply current. | Targeted at RF/IF AGC in cellular infrastructure; lacks DC coupling and wide common-mode input range of LMH6505. | Choose for RF applications >100 MHz requiring integrated detection, accepting trade-offs in DC response and power efficiency. |
Compared with LMH6505MMX/NOPB, LMH6503MMX/NOPB offers simpler linear gain control but no native dB-linearity for AGC, while AD8367ARUZ delivers higher RF bandwidth and on-chip detection at the cost of DC coupling, wider supply constraints, and increased quiescent power.
Availability
LMH6505MMX/NOPB is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, and voltage-controlled filter applications requiring stable component supply, consistent gain matching, and long-term production continuity.
Supply support for LMH6505MMX/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 precision signal chain solutions.
The LMH6505MMX/NOPB belongs to TI's high-performance variable gain amplifier product line, engineered specifically for wideband analog signal conditioning in video, communications, and test equipment where linear-in-dB control, low noise, and fast settling are critical.
FAQ
What is the maximum recommended supply voltage for LMH6505MMX/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6505MMX/NOPB is 12.6 V, but the recommended operating range is 7 V to 12 V total. At ±5 V (10 V total), it delivers optimal performance: 150 MHz bandwidth, 11 mA supply current, and ±2.4 V output swing into 100 Ω. Exceeding ±6 V risks exceeding junction temperature limits under load.
Does LMH6505MMX/NOPB support true DC-coupled operation?
Yes, LMH6505MMX/NOPB is fully DC-coupled: it passes signals from DC to 150 MHz with no internal AC-blocking capacitors. Its input common-mode range extends to ±3 V (RG open), and output swings to within 200 mV of rails. This enables baseband video, sensor signal conditioning, and precision instrumentation where phase coherence at 0 Hz is mandatory.
How does gain matching work across temperature for LMH6505MMX/NOPB?
LMH6505MMX/NOPB guarantees ±0.50 dB gain matching at maximum gain (AVMAX) over −40°C to +85°C. Performance plots (Figure 17) show gain variation remains within ±0.8 dB across the full −55°C to +125°C range when VG is held constant. This stability stems from matched transistor pairs in the multiplier cell and CFA core, minimizing thermal drift in gain-setting elements.
Can LMH6505MMX/NOPB be used with a single 5 V supply?
Yes - LMH6505MMX/NOPB supports single-supply operation by biasing pin 4 (GND) to a stable "virtual ground" at 2.5 V, tying RG to that node, and referencing VG to the same potential. The datasheet provides explicit guidance (Section "Single Supply Operation") including decoupling and current-sinking requirements for the virtual ground node to maintain linearity and avoid clipping.
What is the significance of the "X1" pin (pin 8) on LMH6505MMX/NOPB?
Pin 8 (X1) is the internal non-inverting input node of the input transconductance buffer - exposed for diagnostic or specialized feedback configurations. It is not intended for normal operation. TI advises against connecting external components to X1 unless implementing custom topologies per Application Note SNOSAT4E, as improper use may destabilize the gain cell or degrade noise performance.
LMH6505MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
LMH6505MMX/NOPB FAQ
1.How can I place an order for LMH6505MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MMX/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 LMH6505MMX/NOPB reliable?
The price and inventory of LMH6505MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6505MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MMX/NOPB?
LMH6505MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MMX/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 LMH6505MMX/NOPB?
For technical support, including LMH6505MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MMX/NOPB requirements.
6.How does Aetrix verify that LMH6505MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6505MMX/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 LMH6505MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6505MMX/NOPB?
All LMH6505MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MMX/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 LMH6505MMX/NOPB part is unused and in its original packaging.
Return procedure for LMH6505MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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