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Texas Instruments LMH6504MM
- Part No.:
- LMH6504MM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6504MM.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
LMH6504MM from Texas Instruments is a wideband, low-power, DC-coupled voltage-controlled variable gain amplifier (VGA) featuring 150 MHz −3 dB bandwidth, 80 dB gain adjustment range (<10 MHz), ±55 mV output offset voltage, and 1500 V/μs inverting slew rate. It integrates a transconductance input stage, linear-in-dB gain cell, and current-feedback output amplifier-designed for precision AGC loops in video imaging and RF signal conditioning.
For engineers reviewing the LMH6504MM datasheet, LMH6504MM pinout, LMH6504MM application, or LMH6504MM equivalent, this page delivers verified specifications including gain flatness (±0.2 dB up to 26 MHz), supply current (11 mA), noise density (4.4 nV/√Hz), and thermal performance across −40°C to +85°C operation.
Technical Context
The LMH6504MM implements a three-stage architecture: a high-impedance transconductance input buffer (pin 2), a voltage-controlled multiplier core (VG pin 1), and a current-feedback op amp output stage (pins 6/7). Gain is set by external RF/RG resistors per AVMAX = K·RF/RG (K = 0.965), enabling resistor-programmable maximum gain from 2 V/V to 100 V/V.
Its linear-in-dB gain control (−53 dB feed-through at 30 MHz, 80 dB attenuation range) supports stable closed-loop AGC with soft limiting at extremes. The 150 MHz gain control bandwidth ensures fidelity for fast envelope tracking, while high input impedance (25 MΩ at VG, 7 MΩ at VIN) minimizes drive burden on control and signal sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports full-swing video and IF signals up to 100 MHz without significant amplitude loss |
| Gain Adjustment Range | 80 dB (<10 MHz) - enables >10,000× amplitude scaling for dynamic range compression in AGC systems |
| Slew Rate (inverting) | 1500 V/μs - sustains clean 4 VPP large-signal response at 20 MHz with <20% overshoot |
| Input Noise Density | 4.4 nV/√Hz - contributes <1.4 μV RMS integrated noise (10 kHz–100 MHz) in typical 100 Ω source impedance |
| Output Voltage Swing | ±2.2 V into 100 Ω - delivers 4.4 VPP differential drive for ADC front-ends or cable drivers |
| Supply Current | 11 mA (no load, ±5 V) - enables low-power portable instrumentation with <110 mW total dissipation |
| Gain Matching | ±0.42 dB at AVMAX - ensures ≤1.1× gain variation across multiple channels in multi-path receivers |
Pinout & Package
LMH6504MM is packaged in an 8-pin VSSOP (DGK008A), 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced for high-frequency stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Input | High-impedance (25 MΩ) voltage node; 0–2 V range sets gain linearly in dB; requires ≤0.9 µA drive current |
| 2 (VIN) | Inverting Input | Transconductance input node; ±3.2 V common-mode range; 2.8 pF capacitance limits HF layout sensitivity |
| 3 (RG) | Gain Setting Resistor Terminal | Connects external RG (e.g., 100 Ω); sets input transconductance and max gain; handles ±4 mA current |
| 4 (GND) | Analog Ground Reference | Signal and supply return; must be low-inductance star point for noise-sensitive VGA applications |
| 5 (V+) | Positive Supply | +5 V nominal (7–12 V range); powers both input buffer and CFA output stage |
| 6 (VOUT) | Output Driver | Current-feedback amplifier output; drives 100 Ω loads directly; ±60 mA sourcing/sinking capability |
| 7 (V−) | Negative Supply | −5 V nominal (7–12 V total swing); required for true DC-coupled bipolar signal handling |
| 8 (X1) | Non-inverting Input Buffer Output | Internal node; not user-accessible; provides buffered reference for internal gain cell |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables precise, monotonic AGC response over 80 dB range without digital lookup tables or calibration |
| Resistor-programmable AVMAX | External RF/RG selection allows optimization of bandwidth vs. gain trade-off (e.g., 2 V/V → 150 MHz, 100 V/V → 58 MHz) |
| High-speed current-feedback output | Delivers 1500 V/μs inverting slew rate and ±60 mA drive into heavy loads-eliminates need for external buffers |
| Low input-referred noise | 4.4 nV/√Hz + 2.6 pA/√Hz enables high-SNR amplification of weak baseband or IF signals |
| DC-coupled architecture | Supports true zero-Hz operation for pulse, video sync, and slow-varying control signal conditioning |
| Single-supply compatible | GND pin (4) serves as virtual mid-rail reference; VG and VIN biased relative to it for +5 V only operation |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Real-time analog gain adjustment in medical ultrasound beamformers and broadcast camera front-ends. IC Role / Device Role / Timing Role: VGA core providing programmable signal scaling prior to ADC sampling; maintains constant pixel-level SNR across varying tissue reflectivity or lighting conditions. Use Value: 80 dB linear-in-dB range enables single-chip dynamic range compression without clipping or quantization loss at 10-bit+ resolution. |
Use Scenario: Closed-loop RF receiver gain stabilization in cellular base station transceivers and spectrum analyzers. IC Role / Device Role / Timing Role: Analog gain element in feedback path of envelope detector loop; responds to RSSI voltage within 150 MHz control bandwidth. Use Value: ±0.42 dB gain matching ensures consistent channel-to-channel power leveling across multi-carrier LTE bands. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision amplitude trimming in automated test equipment (ATE) signal sources and calibration modules. IC Role / Device Role / Timing Role: Digitally controlled attenuator using DAC-driven VG; replaces mechanical potentiometers and relay-based step attenuators. Use Value: 0.1 dB flatness up to 30 MHz allows sub-percent amplitude accuracy in 100 MHz arbitrary waveform generation. |
Use Scenario: Tunable low-pass filtering in software-defined radio (SDR) receive chains and adaptive equalizers. IC Role / Device Role / Timing Role: Gain-controlled integrator stage where VG adjusts cutoff frequency via transconductance scaling. Use Value: DC-coupled design supports tunable filter center frequencies from 0 Hz to >10 MHz without capacitor drift or bias shift. |
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 | Linear-in-V/V gain control (not linear-in-dB); 100 MHz bandwidth; lower 3.5 mA supply current | Better suited for digitally interpolated gain ramping or linear interpolation-based control algorithms | Select when gain linearity in volts-not dB-is required for deterministic settling or PWM-based control |
| AD8367ARUZ | 500 MHz bandwidth; 45 dB gain range; requires external VPOS bias; 50 Ω input/output impedance | Optimized for RF/IF gain control above 100 MHz; includes on-chip detector and temperature compensation | Select for GHz-range wireless infrastructure where wideband RF gain stability outweighs DC coupling needs |
Compared with LMH6504MM, LMH6503MM offers superior linearity for digital gain interpolation but lacks AGC-friendly logarithmic response, while AD8367ARUZ delivers higher RF bandwidth and integrated detection at the cost of DC blocking and fixed 50 Ω interface constraints.
Availability
LMH6504MM is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, and variable attenuator applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability for industrial and medical OEM programs.
Supply support for LMH6504MM 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 LMH6504MM belongs to TI's high-speed amplifier portfolio, engineered specifically for DC-coupled, wideband analog signal conditioning in instrumentation, communications, and imaging systems where gain agility and low distortion are critical.
FAQ
What is the maximum recommended supply voltage for LMH6504MM?
The LMH6504MM operates with a total supply voltage range of 7 V to 12 V (e.g., ±3.5 V to ±6 V). Absolute maximum rating is ±6.3 V (12.6 V total), but sustained operation above ±5 V increases power dissipation and may reduce thermal margin. For optimal 150 MHz bandwidth and 11 mA quiescent current, ±5 V is the standard recommended supply configuration for LMH6504MM.
Can LMH6504MM be used with a single +5 V supply?
Yes, LMH6504MM supports single-supply operation. Pin 4 (GND) must be biased to a stable "virtual half-supply" (~2.5 V) using a low-impedance divider or regulator. VG must then swing 0–2 V relative to that reference, and VIN must remain within ±1.8 V of the virtual ground. This configuration preserves DC coupling and full 80 dB gain range while eliminating negative rail requirements for LMH6504MM.
What is the minimum external resistor value for RG in LMH6504MM?
The minimum recommended RG for LMH6504MM is 100 Ω. Lower values increase input current (up to ±4 mA max), risk exceeding IRG_MAX, and degrade distortion-especially at high frequencies. At RG = 100 Ω and RF = 1 kΩ, LMH6504MM achieves AVMAX = 9.7 V/V with ±0.42 dB gain matching and 150 MHz bandwidth. Reducing RG below 100 Ω requires careful THD validation per Figure 32 in the LMH6504MM datasheet.
How does gain accuracy vary across the VG control range for LMH6504MM?
LMH6504MM exhibits ±0.45 dB typical gain accuracy at VG = 2.0 V and ±3.9 dB maximum error across 0.8 V < VG < 2.0 V. Accuracy degrades near VG = 0 V due to feed-through (−53 dB at 30 MHz), but remains within ±0.33 dB for the central 70% of the control range. These values are measured at TA = 25°C, ±5 V supplies, and are specified in the LMH6504MM Electrical Characteristics table under GACCU parameter.
Is LMH6504MM pin-compatible with CLC5523?
Yes, LMH6504MM is a direct replacement for CLC5523 in SOIC-8 and VSSOP-8 packages, sharing identical pinout, supply requirements, and functional behavior. Texas Instruments explicitly lists CLC5523 as a legacy part superseded by LMH6504MM, with improved gain matching (±0.42 dB vs. ±0.7 dB), lower noise (4.4 nV/√Hz vs. 5.5 nV/√Hz), and extended temperature range (−40°C to +85°C). No PCB changes are required when upgrading from CLC5523 to LMH6504MM.
LMH6504MM 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:
- 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:
- 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 FAQ
1.How can I place an order for LMH6504MM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6504MM 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 reliable?
The price and inventory of LMH6504MM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6504MM is usually 5 days.
3.What payment methods are accepted for LMH6504MM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6504MM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6504MM?
LMH6504MM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6504MM 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?
For technical support, including LMH6504MM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6504MM requirements.
6.How does Aetrix verify that LMH6504MM is sourced from the original manufacturer or authorized distributors?
All LMH6504MM 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 meets industry standards.
7.What is the process for return or replacement of LMH6504MM?
All LMH6504MM units undergo pre-shipment inspection (PSI). If there is an issue with LMH6504MM, 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 part is unused and in its original packaging.
Return procedure for LMH6504MM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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