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Texas Instruments LMH6504MA
- Part No.:
- LMH6504MA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6504MA.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,871
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Product details
Overview
LMH6504MA from Texas Instruments is a wideband, low-power, DC-coupled voltage-controlled variable gain amplifier (VGA) featuring 80 dB gain adjustment range up to 10 MHz, −3 dB bandwidth of 150 MHz, slew rate of 1500 V/μs (inverting), and output swing of ±2.2 V into 100 Ω. It integrates a transconductance input stage, linear-in-dB gain cell, and high-speed current-feedback output amplifier - used in video imaging processing, automatic gain control (AGC), and voltage-controlled filter circuits.
For engineers reviewing the LMH6504MA datasheet, LMH6504MA pinout, LMH6504MA application, or LMH6504MA equivalent, key selection considerations include its 0–2 V gain control voltage range, resistor-programmable maximum gain (AVMAX = K·RF/RG), feed-through rejection below −60 dB at <10 MHz, and thermal stability across −40°C to +85°C operating temperature.
Technical Context
The LMH6504MA implements a three-stage architecture: a transconductance input buffer (pin 2), a voltage-controlled multiplier core (VG on pin 1), and a current-feedback output amplifier (pins 6/7). Gain control follows a hyperbolic tangent relationship, yielding linear-in-dB response over most of the 0–2 V VG range - critical for stable AGC loop design.
Its current-feedback topology enables high slew rate (1500 V/μs inverting) and wide small-signal bandwidth (150 MHz at AVMAX = 9.7 V/V), while maintaining low input bias current (−3.5 µA typ), 4.4 nV/√Hz input noise, and ±0.42 dB device-to-device gain matching at maximum gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz at AVMAX = 9.7 V/V - supports high-fidelity video and RF IF signal paths up to 100 MHz |
| Gain Adjustment Range | 80 dB below AVMAX (<10 MHz) - enables precise attenuation control in AGC loops without switching |
| Slew Rate (Inverting) | 1500 V/μs - ensures faithful reproduction of fast transient signals in pulse-based imaging systems |
| Output Voltage Swing | ±2.2 V into 100 Ω - delivers full-scale analog video levels with headroom for sync pulses |
| Input Noise Density | 4.4 nV/√Hz - preserves SNR in low-level sensor signal conditioning stages |
| Supply Current | 11 mA (no load, ±5 V) - enables power-sensitive portable and battery-backed instrumentation |
| Gain Matching | ±0.42 dB at AVMAX - allows multi-channel gain calibration without per-unit trimming |
Pinout & Package
LMH6504MA is housed in an 8-pin SOIC package (Package Number D0008A), with exposed pad not present. Pin functions are validated per TI SNOSA96D Rev. MARCH 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Input | Voltage reference (0–2 V) setting gain linearly in dB; 25 MΩ input resistance eases DAC drive |
| 2 (VIN) | Inverting Input | Main signal input node; ±3.2 V input range supports rail-to-rail video and baseband signals |
| 3 (RG) | Gain-Setting Resistor Terminal | Connects external RG (e.g., 100 Ω) to set AVMAX = K·RF/RG; current-limited to ±4 mA |
| 4 (GND) | Analog Ground Reference | Reference for VG and internal biasing; tied to virtual mid-supply in single-ended operation |
| 5 (V−) | Negative Supply | Accepts −5 V (min −3.5 V); supports dual-supply operation down to ±3.5 V total |
| 6 (VOUT) | Output | Current-feedback amplifier output; drives 100 Ω loads directly with ±60 mA sourcing/sinking |
| 7 (V+) | Positive Supply | Accepts +5 V (min +3.5 V); supply range 7–12 V total enables flexible system rail usage |
| 8 (X1) | Non-Inverting Input | Internally connected to input buffer output; unused in standard configurations |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables stable closed-loop AGC with predictable 1 dB/V sensitivity and soft limiting near AVMAX |
| Resistor-programmable AVMAX | Set via external RF and RG (e.g., RF = 1 kΩ, RG = 100 Ω → AVMAX ≈ 9.7 V/V), decoupling gain from process variation |
| High-Z gain control input | 25 MΩ input resistance and 2.8 pF capacitance minimize loading on precision DACs or filter networks |
| DC-coupled signal path | Supports baseband video, ultrasound, and instrumentation where AC coupling would distort low-frequency content |
| Thermal gain stability | ±0.1 dB gain drift over −40°C to +85°C enables uncalibrated operation in industrial environments |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Analog video signal conditioning in broadcast cameras and medical endoscopes requiring DC-coupled gain adjustment across NTSC/PAL bandwidths. IC Role / Device Role / Timing Role: VGA front-end providing programmable gain from 0 dB to +40 dB while preserving differential gain/phase (<0.45%/0.13°). Use Value: Eliminates mechanical iris or fixed-gain amplifiers; enables real-time exposure compensation without frame latency. |
Use Scenario: Closed-loop RF receiver IF stage maintaining constant output amplitude despite varying antenna signal strength. IC Role / Device Role / Timing Role: Core gain element in feedback loop with RMS detector and DAC, leveraging linear-in-dB response for logarithmic error correction. Use Value: Achieves <±0.5 dB AGC accuracy over 60 dB input dynamic range with <10 µs settling time. |
| Voltage-Controlled Filter | Ultrasound Signal Chain |
Use Scenario: Tunable active filter in test equipment where center frequency and Q are adjusted via analog voltage. IC Role / Device Role / Timing Role: Programmable gain stage preceding switched-capacitor or OTA-C filter, setting overall passband amplitude. Use Value: Enables continuous filter gain tuning without discrete resistor banks or relays - reducing BOM count and PCB area. |
Use Scenario: Receive beamformer channel in portable ultrasound systems requiring low-noise, wideband amplification of echo signals. IC Role / Device Role / Timing Role: First-stage VGA after LNA, compensating for depth-dependent attenuation with 80 dB dynamic range. Use Value: Delivers 4.4 nV/√Hz input noise and 150 MHz bandwidth - preserving axial resolution and contrast in B-mode imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MA | Linear-in-V/V gain control (not linear-in-dB); lower 60 dB gain range; same 150 MHz BW and SOIC-8 package | Better suited for digitally controlled linear gain scaling (e.g., digital potentiometer interfaces) | Select LMH6503MA when absolute linearity in voltage domain is required over logarithmic control fidelity. |
| AD8370ACPZ-R7 | 500 MHz bandwidth; 5.5 V supply; SPI interface; 24-lead LFCSP; higher power (160 mW) | Targeted at broadband communications infrastructure with digital configuration and higher frequency support | Choose AD8370ACPZ-R7 for >200 MHz signal paths or when serial digital control supersedes analog VG simplicity. |
Compared with LMH6504MA, LMH6503MA trades logarithmic control precision for voltage-domain linearity, while AD8370ACPZ-R7 adds digital configurability and bandwidth at the cost of analog simplicity and SOIC compatibility.
Availability
LMH6504MA 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 production continuity, and traceable sourcing from authorized channels.
Supply support for LMH6504MA 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 connectivity technologies, with decades of expertise in high-speed amplifiers and signal chain solutions.
The LMH6504MA belongs to TI's LMH™ high-speed amplifier family, designed specifically for wideband, low-power, DC-coupled analog signal conditioning in professional video, test equipment, and medical imaging systems.
FAQ
What is the maximum recommended supply voltage for LMH6504MA?
The LMH6504MA supports 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 operation above ±5 V increases power dissipation and may reduce thermal margin. For optimal performance and reliability, TI specifies ±5 V as the standard condition in all electrical characteristics tables for LMH6504MA.
Can LMH6504MA operate from a single supply?
Yes, LMH6504MA supports single-supply operation by biasing pin 4 (GND) and the RG resistor to a stable "virtual half-supply" voltage (e.g., 2.5 V for a 5 V system). The VG input must then swing 0–2 V relative to that reference, and VIN must remain within 1.8 V of the rails. This configuration maintains full gain control functionality and is documented in the LMH6504MA application information section.
What is the minimum gain achievable with LMH6504MA?
At VG = 0 V, LMH6504MA exhibits feed-through gain of approximately −60 dB (0.001 V/V) below AVMAX at frequencies <10 MHz. This residual signal path - due to capacitive coupling and internal offsets - defines the practical minimum gain. True cutoff is not achieved, but attenuation exceeds 60 dB across the video band, making LMH6504MA suitable for mute and deep-attenuation functions.
How does LMH6504MA differ from the CLC5523 it replaces?
LMH6504MA replaces CLC5523 with improved specifications: 150 MHz −3 dB bandwidth (vs. 100 MHz), 80 dB gain range (vs. 60 dB), ±0.42 dB gain matching (vs. ±0.7 dB), and lower 4.4 nV/√Hz input noise (vs. 5.5 nV/√Hz). It retains pin compatibility and functional equivalence, enabling drop-in upgrades in existing CLC5523 designs without layout changes.
What external components are required to configure LMH6504MA for AVMAX = 20 dB?
To achieve AVMAX = 20 dB (10 V/V), select RF = 1 kΩ and RG = 100 Ω (since AVMAX ≈ 0.965 × RF/RG). Include 0.1 µF bypass capacitors on V+ and V− pins, and ensure the VG driver can source <1 µA (due to 25 MΩ input resistance). No additional compensation is needed for unity-gain stable operation - LMH6504MA is internally compensated for all AVMAX settings.
LMH6504MA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6504MA FAQ
1.How can I place an order for LMH6504MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6504MA 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 LMH6504MA reliable?
The price and inventory of LMH6504MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6504MA is usually 5 days.
3.What payment methods are accepted for LMH6504MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6504MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6504MA?
LMH6504MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6504MA 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 LMH6504MA?
For technical support, including LMH6504MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6504MA requirements.
6.How does Aetrix verify that LMH6504MA is sourced from the original manufacturer or authorized distributors?
All LMH6504MA 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 LMH6504MA meets industry standards.
7.What is the process for return or replacement of LMH6504MA?
All LMH6504MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH6504MA, 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 LMH6504MA part is unused and in its original packaging.
Return procedure for LMH6504MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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