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Texas Instruments LMH6504MM/NOPB
- Part No.:
- LMH6504MM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6504MM/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,864
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Product details
Overview
LMH6504MM/NOPB from Texas Instruments is a wideband, low-power, DC-coupled voltage-controlled variable gain amplifier (VGA) with 80 dB gain adjustment range, 150 MHz −3 dB bandwidth, and linear-in-dB gain control via VG input (0–2 V). It integrates an input transconductance stage, analog multiplier, and high-speed current-feedback output amplifier-enabling direct drive of 100 Ω loads in video imaging, AGC, and voltage-controlled filter applications.
For engineers reviewing the LMH6504MM/NOPB datasheet, LMH6504MM/NOPB pinout, LMH6504MM/NOPB application, or LMH6504MM/NOPB equivalent, key selection criteria include its 150 MHz gain control bandwidth, ±55 mV output offset over full VG range, 1500 V/μs inverting slew rate, 4.4 nV/√Hz input noise, and compatibility with ±5 V supplies in SOIC-8 and VSSOP-8 packages.
Technical Context
The LMH6504MM/NOPB implements a three-stage architecture: a transconductance input buffer (gain set by RG), a voltage-controlled analog multiplier (VG-modulated gain cell), and a current-feedback op amp output stage (gain set by RF). Its gain follows a hyperbolic tangent function, yielding linear-in-dB response across most of the 0–2 V VG range.
Gain is resistor-programmable (AVMAX = K·RF/RG, K = 0.965 typ), independent of signal frequency up to 150 MHz. Feedthrough at VG = 0 V is −53 dB (30 MHz), limiting minimum usable gain; output stage delivers ±60 mA linear current into 100 Ω while maintaining ±2.2 V swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports high-frequency video and RF IF signals without attenuation |
| Gain Adjustment Range | 80 dB (<10 MHz) - enables precise automatic gain control over 100:1 amplitude span |
| Inverting Slew Rate | 1500 V/μs - ensures faithful reproduction of fast transient video edges and pulse signals |
| Output Offset Voltage | ±55 mV (0 V < VG < 2 V) - minimizes DC error in cascaded AC-coupled signal chains |
| Input Noise Density | 4.4 nV/√Hz - preserves SNR in low-level signal amplification stages |
| Supply Current | 11 mA (no load, ±5 V) - enables power-sensitive portable and battery-backed systems |
| Gain Matching | ±0.42 dB at AVMAX - ensures consistent channel-to-channel gain in multi-path receivers |
Pinout & Package
LMH6504MM/NOPB is packaged in an 8-pin VSSOP (DGK008A), 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced surface-mount package suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VG | Gain control voltage input | 0–2 V reference to GND (Pin 4); high-impedance (25 MΩ) interface for DAC or AGC loop |
| 2 - VIN | Inverting input | Transconductance stage input; accepts ±3.2 V differential range with 7 MΩ input resistance |
| 3 - RG | Gain-setting resistor connection | Defines input transconductance; sets max gain with RF and K (AVMAX = K·RF/RG) |
| 4 - GND | Analog ground reference | Reference for VG and bias network; tied to virtual mid-supply in single-ended operation |
| 5 - V+ | Positive supply rail | Accepts +3.5 V to +6 V (±5 V nominal); 12.6 V absolute max |
| 6 - VOUT | Current-feedback amplifier output | Drives 100 Ω loads directly; ±2.2 V swing into 100 Ω, ±60 mA linear output current |
| 7 - V− | Negative supply rail | Accepts −3.5 V to −6 V (±5 V nominal); 12.6 V total supply range max |
| 8 - X1 | Non-inverting input / buffer output | Internal node; not user-accessible - connects input buffer to multiplier stage |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Hyperbolic tangent transfer function enables stable closed-loop AGC with soft limiting at extremes |
| Resistor-programmable AVMAX | Set independently via RF and RG - decouples bandwidth (RF-dependent) from gain range (RG-dependent) |
| High-Z VG and VIN inputs | 25 MΩ VG impedance and 7 MΩ VIN resistance simplify driving circuitry and reduce loading errors |
| Current-feedback output stage | Delivers 1500 V/μs inverting slew rate and maintains flat frequency response under heavy capacitive loads |
| Wide temperature operation | Specified from −40°C to +85°C with <±0.42 dB gain matching across units |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying composite video signals (e.g., NTSC/PAL) prior to digitization in broadcast equipment or medical endoscopes. IC Role / Device Role / Timing Role: VGA front-end providing DC-coupled, wideband gain adjustment to maintain constant luminance/chrominance amplitude despite varying source levels. Use Value: 0.45% differential gain and 0.13° differential phase error preserve color fidelity; 150 MHz bandwidth accommodates >4.43 MHz chroma components. | Use Scenario: Stabilizing RF IF signal amplitude in receiver front-ends (e.g., cellular base stations, spectrum analyzers). IC Role / Device Role / Timing Role: Core gain-control element in feedback loops where VG is driven by RMS detector or log amp output. Use Value: Linear-in-dB response simplifies loop compensation; 80 dB dynamic range allows detection of weak signals amid strong interferers. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision programmable loss insertion in test instrumentation (e.g., vector network analyzer calibration paths). IC Role / Device Role / Timing Role: Digitally controlled attenuator replacing mechanical or PIN-diode solutions in automated test equipment. Use Value: Monotonic 80 dB attenuation with ±0.42 dB unit-to-unit matching ensures traceable calibration; DC coupling supports baseband and low-frequency signals. | Use Scenario: Tuning cutoff frequency and Q-factor in active filter stages for software-defined radio (SDR) channel selection. IC Role / Device Role / Timing Role: Gain-controllable element in biquad or state-variable filter topologies where VG modulates pole location. Use Value: 150 MHz gain control bandwidth permits real-time reconfiguration up to ~15 MHz filter corner frequencies without phase lag. |
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); 100 MHz bandwidth; lower 4.2 nV/√Hz noise | Better suited for applications requiring precise linear gain scaling (e.g., programmable gain instrumentation amps) | Select LMH6503MM/NOPB when gain must scale linearly with control voltage, not logarithmically. |
| AD8370ACPZ-R7 | 500 MHz bandwidth; 55 dB gain range; 3.3 V single-supply only; integrated 10-bit SPI interface | Targeted at high-speed communications infrastructure with digital control; no analog VG pin | Select AD8370ACPZ-R7 when digital serial control and >200 MHz bandwidth are required, and analog VG interface is unnecessary. |
Compared with LMH6504MM/NOPB, LMH6503MM/NOPB offers superior linearity in voltage-domain gain control but sacrifices AGC suitability; AD8370ACPZ-R7 provides wider bandwidth and digital configurability at the cost of analog simplicity and dual-supply flexibility.
Availability
LMH6504MM/NOPB is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, and voltage-controlled filter applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LMH6504MM/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 and embedded processing solutions, with deep expertise in high-speed amplifiers, data converters, and precision signal chain components.
The LMH6504MM/NOPB belongs to TI's LMH high-speed amplifier family, designed specifically for wideband, low-distortion, voltage-controlled gain applications in professional video, test equipment, and communications infrastructure.
FAQ
What is the maximum recommended supply voltage for LMH6504MM/NOPB?
The LMH6504MM/NOPB 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 operation with full parameter guarantees, use ±5 V supplies. Exceeding ±6 V risks permanent damage per Absolute Maximum Ratings.
Can LMH6504MM/NOPB operate from a single 5 V supply?
Yes, LMH6504MM/NOPB supports single-supply operation: tie Pin 4 (GND) to a stable "virtual ground" at 2.5 V (e.g., resistive divider + buffer), bias VIN and VG relative to that node, and ensure VG spans 2.5 V to 4.5 V. The internal architecture accommodates this configuration without performance degradation.
What is the purpose of the X1 pin on LMH6504MM/NOPB?
The X1 pin on LMH6504MM/NOPB is an internal node connecting the input transconductance stage to the analog multiplier core. It is not intended for external connection - TI's datasheet explicitly states it is not user-accessible and must remain unconnected in all designs using LMH6504MM/NOPB.
How does gain matching affect multi-channel LMH6504MM/NOPB systems?
LMH6504MM/NOPB exhibits ±0.42 dB gain matching at maximum gain across units, meaning two identically configured devices will differ by no more than 0.84 dB. This tight matching enables coherent beamforming, parallel channel processing, and balanced I/Q signal paths without per-channel calibration in LMH6504MM/NOPB-based systems.
Why is the inverting configuration recommended for high-slew-rate applications with LMH6504MM/NOPB?
The inverting configuration bypasses the input buffer's slew limitation, enabling LMH6504MM/NOPB's full 1500 V/μs slew rate. In non-inverting mode, the buffer dominates slew behavior, reducing effective rate to ~800 V/μs. For pulse, video edge, or fast transient fidelity, the inverting topology is essential - and LMH6504MM/NOPB's pinout and internal architecture fully support it.
LMH6504MM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1500V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 1.4 µA
- 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
LMH6504MM/NOPB FAQ
1.How can I place an order for LMH6504MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6504MM/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 LMH6504MM/NOPB reliable?
The price and inventory of LMH6504MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6504MM/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6504MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6504MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6504MM/NOPB?
LMH6504MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6504MM/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 LMH6504MM/NOPB?
For technical support, including LMH6504MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6504MM/NOPB requirements.
6.How does Aetrix verify that LMH6504MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6504MM/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 LMH6504MM/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6504MM/NOPB?
All LMH6504MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6504MM/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 LMH6504MM/NOPB part is unused and in its original packaging.
Return procedure for LMH6504MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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