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Texas Instruments LMH6505MM/NOPB
- Part No.:
- LMH6505MM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6505MM/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,602
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Product details
Overview
LMH6505MM/NOPB 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 high-speed current-feedback output amplifier - enabling precise AGC in RF/IF signal chains, video imaging, and voltage-controlled filter applications.
For engineers reviewing the LMH6505MM/NOPB datasheet, LMH6505MM/NOPB pinout, LMH6505MM/NOPB application, or LMH6505MM/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in video and communications systems, and two rigorously cross-checked alternative VGAs with documented functional differences.
Technical Context
The LMH6505MM/NOPB implements a three-stage architecture: a high-impedance transconductance input buffer (pin 2), a voltage-controlled gain cell modulated by VG (pin 1), and a current-feedback output amplifier (pins 5, 6, 7, 8). Gain is set externally via RG (pin 3) and RF (pin 1), with AVMAX = K·RF/RG (K = 0.940 typical).
Its linear-in-dB response over 0–2 V VG range enables stable closed-loop AGC; feedthrough at VG = 0 V is −51 dB at 30 MHz. Output drive capability includes ±60 mA sourcing/sinking and ±2.4 V swing into 100 Ω, supported by 1500 V/μs slew rate in inverting configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports full-swing signals up to UHF frequencies with minimal amplitude roll-off. |
| Gain Control Bandwidth | 100 MHz - enables fast gain updates without distorting modulated carriers or video edges. |
| Attenuation Range | 80 dB below 10 MHz - provides wide dynamic range for automatic level control in receivers. |
| Slew Rate (Inverting) | 1500 V/μs - ensures faithful reproduction of fast-rising video sync pulses or radar pulses. |
| Input Noise Voltage | 4.4 nV/√Hz - maintains SNR integrity in front-end amplification stages before ADCs. |
| Supply Current | 11 mA (no load) - enables battery-powered or thermally constrained portable instrumentation. |
| Output Voltage Swing | ±2.4 V into 100 Ω - drives standard 75 Ω video loads with AC-coupled termination. |
| Gain Matching Limit | ±0.50 dB at max gain - guarantees consistent channel-to-channel gain in multi-path systems. |
Pinout & Package
LMH6505MM/NOPB is packaged in an 8-pin VSSOP (DGK) with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed thermal pad. Pin 4 is GND; pin 5 is V+; pin 7 is V−; pin 6 is VOUT; pin 2 is VIN; pin 3 is RG; pin 1 is VG; pin 8 is X1 (internal node, not user-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain control voltage input | 0–2 V referenced to GND (pin 4); high-impedance (>25 MΩ) interface simplifies DAC or PWM filtering. |
| 2 (VIN) | Inverting input of transconductance stage | DC-coupled, ±3 V input range; low bias current (−2.5 µA typ) minimizes offset error with high-RG networks. |
| 3 (RG) | Gain-setting resistor connection | Current-sensing node defining transconductance; IRG_MAX = ±7.4 mA limits usable input voltage swing. |
| 4 (GND) | Analog ground reference | Common return for VG, RG, and signal paths; critical for noise rejection in single-supply configurations. |
| 5 (V+) | Positive supply rail | Accepts +3.5 V to +6 V (±5 V nominal); PSRR >65 dB suppresses supply ripple from switching regulators. |
| 6 (VOUT) | Current-feedback amplifier output | Drives 50–100 Ω loads directly; requires RF feedback (typically 1 kΩ) for stable gain configuration. |
| 7 (V−) | Negative supply rail | Accepts −3.5 V to −6 V (±5 V nominal); symmetrical rails enable true bipolar signal handling. |
| 8 (X1) | Internal transconductance stage output | Not accessible externally; connects internally to gain cell - no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | 80 dB range with <±0.50 dB matching across units enables predictable AGC loop design without calibration. |
| Current-feedback output stage | 1500 V/μs slew rate and ±60 mA drive support heavy capacitive loads and fast transient recovery in video lines. |
| Wideband DC-coupled architecture | 150 MHz bandwidth with DC coupling allows baseband video, IF, and pulse-amplitude modulation without AC-blocking caps. |
| Low-noise input stage | 4.4 nV/√Hz input voltage noise + 2.6 pA/√Hz current noise optimizes SNR in low-level signal conditioning. |
| Single-supply compatible operation | VG referenced to GND and rail-to-rail input/output swing allow use with virtual ground at mid-supply (e.g., 2.5 V). |
| High gain accuracy | ±0.50 dB gain accuracy at VG = 2.0 V ensures repeatable system-level gain calibration in production test. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
|
Use Scenario: Amplifying composite video signals (NTSC/PAL) prior to digitization in broadcast cameras and medical endoscopes. IC Role / Device Role / Timing Role: DC-coupled VGA providing programmable black-level and gain adjustment with sub-1% gain matching across channels. Use Value: Maintains differential gain/phase <0.30%/0.15° while supporting 4.43 MHz color burst fidelity and 150 MHz pixel clock edge integrity. |
Use Scenario: Stabilizing RF signal amplitude in direct-conversion receivers for cellular base stations and spectrum analyzers. IC Role / Device Role / Timing Role: Wideband VGA in feedback loop with RMS detector, adjusting gain every 100 ns to suppress fading or interference bursts. Use Value: 100 MHz gain control BW and 80 dB range enable real-time correction of >40 dB signal fluctuations without overshoot or settling delay. |
| Voltage-Controlled Filter | Test & Measurement Signal Conditioning |
|
Use Scenario: Tuning center frequency and Q-factor in active bandpass filters for EMI pre-compliance testing. IC Role / Device Role / Timing Role: Gain element in state-variable filter topology where VG sets resonance depth and bandwidth scaling. Use Value: Linear-in-dB response ensures logarithmic filter tuning linearity; 150 MHz BW supports harmonics up to 7th order. |
Use Scenario: Scaling analog outputs from arbitrary waveform generators (AWGs) to match DUT input ranges in automated test equipment. IC Role / Device Role / Timing Role: Precision programmable attenuator/gain stage with calibrated 0.1 dB resolution via DAC-driven VG. Use Value: ±0.50 dB gain matching and <±10 mV output offset ensure traceable amplitude accuracy across temperature and unit batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MM/NOPB | Linear-in-V/V gain control (not linear-in-dB); 200 MHz bandwidth; 60 dB range; higher supply current (14 mA). | Better suited for digitally controlled gain steps requiring exact V/V proportionality (e.g., digital potentiometer interfaces). | Select when gain must scale linearly with control voltage, not logarithmically - e.g., in open-loop programmable gain stages. |
| AD8367ARUZ | 500 MHz bandwidth; 45 dB range; integrated RMS detector; 5 V single-supply only; higher power (125 mW). | Integrated detector enables self-contained AGC loops; lacks DC coupling and dual-supply flexibility of LMH6505MM/NOPB. | Choose when closed-loop AGC with on-chip detection is required and RF bandwidth >150 MHz is mandatory. |
Compared with LMH6505MM/NOPB, LMH6503MM/NOPB trades logarithmic control linearity for wider bandwidth and linear transfer, while AD8367ARUZ replaces external detector dependency with monolithic integration at the cost of DC coupling and supply flexibility.
Availability
LMH6505MM/NOPB is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, voltage-controlled filter, and test & measurement signal conditioning requiring stable component supply, long-term lifecycle assurance, and TI-qualified production lots.
Supply support for LMH6505MM/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The LMH6505MM/NOPB belongs to TI's high-speed amplifier portfolio, designed specifically for wideband, low-power, DC-coupled gain control in professional video, communications infrastructure, and instrumentation systems.
FAQ
What is the maximum recommended supply voltage for LMH6505MM/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6505MM/NOPB is 12.6 V, but the specified operating range is 7 V to 12 V. TI recommends using ±5 V (10 V total) for optimal distortion and bandwidth performance. Exceeding ±6 V risks increased THD and reduced PSRR, as confirmed in Figure 14 of the SNOSAT4E datasheet.
Does LMH6505MM/NOPB support true single-supply operation?
Yes - LMH6505MM/NOPB supports single-supply operation by biasing pin 4 (GND) to a virtual mid-rail (e.g., 2.5 V), tying RG (pin 3) to that node, and referencing VG (pin 1) to the same potential. Input and output swing remain rail-to-rail relative to the virtual ground, as detailed in the "Single Supply Operation" section of the datasheet.
What is the purpose of pin 8 (X1) on LMH6505MM/NOPB?
Pin 8 (X1) is an internal node connecting the transconductance stage output to the gain cell input. It is not intended for external connection and has no user-accessible function. TI's connection diagram (Figure 3) and block diagram (Figure 41) confirm X1 is unbroken and unbuffered - leaving it unconnected is mandatory for proper operation.
How does gain accuracy vary across the VG range for LMH6505MM/NOPB?
LMH6505MM/NOPB gain accuracy is ±0.50 dB at VG = 2.0 V, but degrades to +4.3/−3.9 dB across 0.8 V < VG < 2.0 V (Electrical Characteristics table). This non-uniformity arises from hyperbolic tangent gain law; for highest accuracy, operate near VG = 2.0 V or calibrate per unit using Figure 42's theoretical gain model.
Can LMH6505MM/NOPB drive a 50 Ω coaxial cable directly?
Yes - LMH6505MM/NOPB delivers ±60 mA output current and ±2.4 V swing into 100 Ω, making it capable of driving 50 Ω loads with appropriate series termination. For 75 Ω video lines, use a 25 Ω series resistor at VOUT (pin 6) to match impedance and minimize reflections, as validated in Figure 28's output current vs. voltage curves.
LMH6505MM/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:
- 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-VSSOP
LMH6505MM/NOPB FAQ
1.How can I place an order for LMH6505MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MM/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 LMH6505MM/NOPB reliable?
The price and inventory of LMH6505MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MM/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6505MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MM/NOPB?
LMH6505MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MM/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 LMH6505MM/NOPB?
For technical support, including LMH6505MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MM/NOPB requirements.
6.How does Aetrix verify that LMH6505MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6505MM/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 LMH6505MM/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6505MM/NOPB?
All LMH6505MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MM/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 LMH6505MM/NOPB part is unused and in its original packaging.
Return procedure for LMH6505MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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