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Texas Instruments LMH6505MAX/NOPB
- Part No.:
- LMH6505MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6505MAX/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,334
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Product details
Overview
LMH6505MAX/NOPB from Texas Instruments is a wideband, linear-in-dB, voltage-controlled variable gain amplifier (VGA) with 150 MHz −3 dB bandwidth, 80 dB gain adjustment range (<10 MHz), and ±0.50 dB gain matching at maximum gain. It integrates a transconductance input stage, voltage-controlled multiplier, and current-feedback output amplifier - enabling precise AGC in RF and video signal chains.
For engineers reviewing the LMH6505MAX/NOPB datasheet, LMH6505MAX/NOPB pinout, LMH6505MAX/NOPB application, or LMH6505MAX/NOPB equivalent, key selection criteria include its linear-in-dB control law (0–2 V VG input), 100 MHz gain control bandwidth, ±60 mA output drive, 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 LMH6505MAX/NOPB implements a three-stage architecture: a high-impedance transconductance input buffer (pin 2, RIN = 7 MΩ), a voltage-controlled analog multiplier (VG on pin 1, 0–2 V range), and a current-feedback op amp output stage (pins 6/7). Gain is set by external resistors RG (pin 3) and RF (pin 5), with AVMAX = K·RF/RG (K = 0.940 typ).
Its linear-in-dB response arises from a hyperbolic tangent transfer function between VG and gain (V/V), yielding ±0.2 dB flatness over 26 dB attenuation range below 30 MHz. Output offset remains ≤ ±55 mV across full VG range, and device-to-device gain matching is ensured within ±0.50 dB at AVMAX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports wideband IF/RF signal processing up to UHF without external compensation |
| Gain Control Bandwidth | 100 MHz - enables fast AGC loop response for burst-mode or transient signal suppression |
| Gain Adjustment Range | 80 dB (f < 10 MHz) - provides >60 dB dynamic range for automatic level control in receiver front-ends |
| Slew Rate (Inverting) | 1500 V/μs - sustains large-signal fidelity (e.g., 4 VPP) at 20 MHz with minimal distortion |
| Input Noise Voltage | 4.4 nV/√Hz - ensures low-noise amplification in baseband and intermediate frequency stages |
| Supply Current (No Load) | 11 mA - enables power-sensitive designs such as portable test equipment and battery-backed modules |
| Output Drive Capability | ±60 mA - directly drives 50 Ω or 100 Ω loads without external buffering |
| Gain Matching Tolerance | ±0.50 dB at AVMAX - guarantees consistent channel-to-channel gain in multi-path systems |
Pinout & Package
LMH6505MAX/NOPB is packaged in an 8-pin SOIC (SOIC-8) with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.27 mm pitch). Thermal resistance θJA = 165°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Input | High-impedance (25 MΩ) voltage input; 0–2 V range sets gain linearly in dB; referenced to GND (pin 4) |
| 2 (VIN) | Inverting Input | Transconductance input node; ±3 V common-mode range; 7 MΩ input resistance, 2.8 pF capacitance |
| 3 (RG) | Gain Set Resistor Terminal | DC current path defining input transconductance; IRG_MAX = ±7.4 mA limits max input voltage swing |
| 4 (GND) | Ground Reference | Signal and supply reference for split-supply operation; used as "virtual half-supply" in single-supply configs |
| 5 (V+) | Positive Supply | Accepts +3.5 V to +6 V; PSRR = −72 dB (1 V change); requires local 0.1 µF + 6.8 µF decoupling |
| 6 (VOUT) | Output | Current-feedback amplifier output; ±2.4 V swing into 100 Ω; capable of ±60 mA sourcing/sinking |
| 7 (V−) | Negative Supply | Accepts −3.5 V to −6 V; PSRR = −75 dB (1 V change); symmetric decoupling required |
| 8 (X1) | Non-Inverting Input / Buffer Output | Internal node of input transconductance stage; not externally accessible; used only for internal feedback |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | 0–2 V VG input yields 80 dB attenuation range with ±0.2 dB flatness up to 30 MHz - simplifies AGC loop design |
| Resistor-programmable AVMAX | Set via external RF/RG ratio (AVMAX = 0.94·RF/RG); supports 2–100 V/V range without internal trimming |
| High-speed current-feedback output | 1500 V/μs slew rate and 150 MHz bandwidth enable clean 4 VPP signals at 20 MHz with −45 dBc THD |
| Low-noise input stage | 4.4 nV/√Hz input voltage noise + 2.6 pA/√Hz input current noise - optimal for low-level RF/IF amplification |
| Single-supply compatibility | GND pin (4) serves as virtual mid-rail reference; VG and VIN biased relative to it - eliminates need for charge pumps |
| Robust DC performance | ≤ ±55 mV output offset over full VG range and temperature (−40°C to +85°C); ±0.50 dB gain matching across units |
Applications
| Wireless Receiver AGC | Video Signal Level Control |
|---|---|
Use Scenario: Dynamic signal amplitude management in 5G NR or LTE baseband receivers handling >60 dB input variation. IC Role / Device Role / Timing Role: VGA core in IF chain; gain updated every 10–100 µs based on RSSI feedback. Use Value: 100 MHz gain control BW ensures sub-microsecond AGC settling; 80 dB range accommodates fading and interference. |
Use Scenario: Real-time luminance normalization in broadcast-grade SDI/HDMI video processors. IC Role / Device Role / Timing Role: DC-coupled gain stage before ADC; adjusts black/white levels without clipping. Use Value: ±2.4 V output swing into 75 Ω matches video line driver requirements; 4.4 nV/√Hz noise preserves SNR. |
| Programmable IF Filter Tuning | Test Equipment Signal Conditioning |
Use Scenario: Adjustable bandpass response in spectrum analyzers using VGA-based active filter topologies. IC Role / Device Role / Timing Role: Gain element in voltage-controlled biquad or state-variable filter sections. Use Value: Linear-in-dB law enables constant-Q tuning; 150 MHz BW supports >50 MHz IF bandwidths. |
Use Scenario: Precision amplitude scaling in automated test equipment (ATE) source-measure units. IC Role / Device Role / Timing Role: Calibrated gain block between DAC output and DUT interface. Use Value: ±0.50 dB gain matching ensures traceable amplitude accuracy across parallel channels; 11 mA quiescent current reduces thermal drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-controlled gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MAX/NOPB | Linear-in-V/V (not dB) gain control; 120 MHz BW; lower 60 dB gain range; no VG input impedance spec | Better suited for digitally controlled linear gain steps (e.g., FPGA-driven step attenuators) | Select when linear voltage-to-gain mapping is required and AGC loop bandwidth < 50 MHz suffices |
| AD8367ARUZ | 500 MHz BW; 45 dB range; 2.7 V to 5.5 V single-supply; integrated RMS detector; higher 25 mA supply current | Integrated detector enables closed-loop AGC without external ADC/comparator; wider RF bandwidth | Choose for self-contained AGC in 400–900 MHz ISM bands where detector integration reduces BOM count |
Compared with LMH6505MAX/NOPB, LMH6503MAX/NOPB trades logarithmic control precision for simpler linear scaling, while AD8367ARUZ adds detection functionality at the cost of higher power and reduced gain range - making LMH6505MAX/NOPB optimal for discrete, high-fidelity IF/AGC stages requiring wide dynamic range and low noise.
Availability
LMH6505MAX/NOPB is available at Aetrix Electronics and suitable for wireless infrastructure, broadcast video processing, test instrumentation, and medical imaging systems requiring stable component supply and guaranteed long-term availability.
Supply support for LMH6505MAX/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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The LMH6505MAX/NOPB belongs to TI's high-speed amplifier portfolio, designed specifically for wideband, low-distortion, voltage-controlled gain applications in RF, video, and instrumentation signal chains.
FAQ
What is the recommended supply voltage range for LMH6505MAX/NOPB?
The LMH6505MAX/NOPB operates over a total supply voltage range of 7 V to 12 V (i.e., ±3.5 V to ±6 V). Typical characterization uses ±5 V. Operation outside this range may cause parametric degradation or damage; absolute maximum supply is ±6.3 V. For single-supply use, GND (pin 4) must be biased at mid-rail (e.g., 2.5 V for 5 V system) with adequate current sourcing/sinking capability.
How does the LMH6505MAX/NOPB achieve linear-in-dB gain control?
The LMH6505MAX/NOPB achieves linear-in-dB behavior through an internal hyperbolic tangent transfer function between VG (pin 1) and gain (V/V). This results in a near-straight-line relationship between VG (0–2 V) and gain expressed in dB - verified across 80 dB range at <10 MHz. The LMH6505MAX/NOPB datasheet Figure 19 plots this confirmed characteristic.
Can LMH6505MAX/NOPB drive a 50 Ω load directly?
Yes, the LMH6505MAX/NOPB can drive a 50 Ω load directly: its output delivers ±60 mA and maintains ±2.1 V swing into 100 Ω (per Electrical Characteristics table), implying ≥ ±1.05 V into 50 Ω. For full 2 VPP swing into 50 Ω, verify layout parasitics and thermal derating - TI's typical application circuit (Figure 2) uses 50 Ω series termination.
What is the maximum recommended AVMAX for LMH6505MAX/NOPB?
While the LMH6505MAX/NOPB is characterized at AVMAX = 9.4 V/V, TI recommends AVMAX between 2 V/V and 100 V/V. Higher gains increase sensitivity to input offset, noise, and distortion - especially harmonic distortion above −45 dBc at 20 MHz. Practical upper limit is constrained by IRGMAX (±7.4 mA) and input voltage range (±0.74 V with RG = 100 Ω).
Does LMH6505MAX/NOPB require external compensation capacitors?
No, the LMH6505MAX/NOPB is internally compensated and stable with standard RF/RG configurations. Its current-feedback output stage eliminates need for external compensation; bandwidth is set solely by RF value (doubling RF halves bandwidth). TI's typical application circuits (Figures 2, 41) show no added capacitors - only standard 0.1 µF + 6.8 µF supply decoupling is required.
LMH6505MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMH6505MAX/NOPB FAQ
1.How can I place an order for LMH6505MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MAX/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 LMH6505MAX/NOPB reliable?
The price and inventory of LMH6505MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6505MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MAX/NOPB?
LMH6505MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MAX/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 LMH6505MAX/NOPB?
For technical support, including LMH6505MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MAX/NOPB requirements.
6.How does Aetrix verify that LMH6505MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6505MAX/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 LMH6505MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6505MAX/NOPB?
All LMH6505MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MAX/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 LMH6505MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH6505MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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