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Texas Instruments LMH6504MAX
- Part No.:
- LMH6504MAX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6504MAX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
LMH6504MAX 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 high-speed current-feedback output amplifier-designed for precision AGC loops in video imaging and RF signal conditioning.
For engineers reviewing the LMH6504MAX datasheet, LMH6504MAX pinout, LMH6504MAX application, or LMH6504MAX equivalent, key selection criteria include its resistor-programmable AVMAX (2–100 V/V), 150 MHz gain control bandwidth, ±0.42 dB device-to-device gain matching at max gain, and compatibility with ±5 V supplies across −40°C to +85°C.
Technical Context
The LMH6504MAX implements a three-stage architecture: a transconductance input buffer (gain set by RG), a hyperbolic-tangent voltage-controlled multiplier (VG = 0–2 V), and a current-feedback output amplifier (gain set by RF). Its linear-in-dB gain response over 80 dB enables stable closed-loop AGC operation without logarithmic conversion circuitry.
Gain is defined as AV = K × RF / RG × tanh[(N − VG)/VC], where K = 0.965 (nominal), N = 0.96 V, and VC = 80 mV. Feedthrough at VG = 0 V is ≤−60 dB below 10 MHz, and output drive capability supports ±60 mA into 100 Ω with ±2.2 V swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports high-fidelity video and IF signal amplification up to 150 MHz with <1 dB flatness loss. |
| Gain Adjustment Range | 80 dB (<10 MHz) - enables precise attenuation from full gain down to cutoff, critical for dynamic range compression. |
| Slew Rate (inverting) | 1500 V/μs - ensures distortion-free large-signal response for 4 VPP pulses with <2.1 ns rise/fall time. |
| Output Offset Voltage | ±55 mV (0 V < VG < 2 V) - limits DC error in cascaded analog signal chains without external nulling. |
| Supply Current | 11 mA (no load, ±5 V) - delivers 150 MHz performance at only 110 mW total power dissipation. |
| Input Noise Density | 4.4 nV/√Hz - maintains SNR integrity in low-level signal amplification stages before ADCs. |
| Gain Matching | ±0.42 dB at AVMAX - ensures consistent channel-to-channel gain in multi-path systems like phased-array receivers. |
Pinout & Package
LMH6504MAX is packaged in an 8-pin SOIC (Package Number D0008A) with standard lead pitch and thermal resistance θJA = 165°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Input | Voltage-controlled gain setting node; accepts 0–2 V relative to GND (pin 4); 25 MΩ input impedance minimizes loading on DAC or filter networks. |
| 2 (VIN) | Inverting Input | Main signal input node; ±3.2 V input voltage range allows direct coupling to biased sources or AC-coupled video signals. |
| 3 (RG) | Gain-Setting Resistor Terminal | Connects external RG (e.g., 100 Ω) to set transconductance stage gain; IRG_MAX = ±4 mA limits usable input swing. |
| 4 (GND) | Analog Ground Reference | Ground reference for VG and RG; in single-supply operation, tied to virtual half-supply for level-shifting. |
| 5 (V+) | Positive Supply Rail | Accepts +5 V (or +3.5–+6 V); PSRR >76 dB suppresses supply noise from affecting gain accuracy. |
| 6 (VOUT) | Amplified Output | Current-feedback output capable of ±60 mA into 100 Ω; ±2.2 V swing ensures headroom for 1 VPP video or IF signals. |
| 7 (V−) | Negative Supply Rail | Accepts −5 V (or −3.5–−6 V); −PSRR >88 dB provides superior rejection of negative rail noise. |
| 8 (X1) | Non-Inverting Input | Internally connected to input buffer output; unused in standard configurations but enables custom feedback topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables stable, monotonic AGC loop design without digital log conversion or lookup tables. |
| Resistor-programmable AVMAX | AVMAX = K × RF / RG allows flexible gain scaling (2–100 V/V) without changing IC; K = 0.965 nominal. |
| High-Z VG and VIN inputs | 25 MΩ VG input and 7 MΩ VIN input reduce DAC loading and preserve source signal integrity. |
| Current-feedback output stage | Delivers 150 MHz bandwidth independent of closed-loop gain-unlike voltage-feedback op amps. |
| Low distortion at 20 MHz | THD = −45 dBc (2 VPP, RL = 100 Ω) supports broadcast-quality video and clean IF signal paths. |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying composite video signals (e.g., NTSC/PAL) prior to digitization in medical endoscopes or broadcast cameras. IC Role / Device Role / Timing Role: VGA front-end providing programmable gain compensation for varying scene illumination and sensor output levels. Use Value: ±0.45 dB gain accuracy and 0.45% differential gain error preserve color fidelity and luma linearity across brightness changes. | Use Scenario: Closed-loop RF receiver chain maintaining constant IF amplitude despite fluctuating antenna signal strength. IC Role / Device Role / Timing Role: Core gain-control element in analog AGC loop, responding to detector output with 150 MHz control bandwidth. Use Value: Linear-in-dB response simplifies loop filter design and avoids instability from log-domain nonlinearities. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision RF test equipment requiring calibrated, stepless attenuation of 10–100 MHz signals during calibration sweeps. IC Role / Device Role / Timing Role: Digitally controlled attenuator using DAC-driven VG input to replace mechanical or switched resistor networks. Use Value: 80 dB dynamic range and ±0.42 dB gain matching enable traceable, repeatable attenuation without calibration per unit. | Use Scenario: Tunable bandpass filtering in software-defined radio (SDR) front-ends where center frequency and Q are adjusted via analog control voltages. IC Role / Device Role / Timing Role: Gain-controllable active filter stage where VG modulates effective transconductance to shift pole locations. Use Value: Wideband 150 MHz gain control BW allows real-time filter reconfiguration without settling delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MAX | Linear-in-V/V gain control (not linear-in-dB); 100 MHz bandwidth; lower power (7.5 mA). | Better suited for digitally controlled linear gain scaling (e.g., DSP-based gain staging), not analog AGC loops. | Select LMH6503MAX when gain must scale linearly with control voltage and AGC stability is not required. |
| AD8370ARUZ | 500 MHz bandwidth; 5.5 V supply; integrated 12-bit SPI interface; 0.5 dB gain resolution. | Designed for digital control in communications infrastructure; lacks analog VG pin and SOIC packaging. | Choose AD8370ARUZ for high-speed, digitally programmable gain in base station IF stages where SPI control is available. |
Compared with LMH6504MAX, LMH6503MAX trades AGC-optimized linear-in-dB response for simpler linear gain law, while AD8370ARUZ replaces analog VG control with digital precision at higher speed and cost-making LMH6504MAX optimal for analog-loop, SOIC-based, medium-bandwidth gain control.
Availability
LMH6504MAX 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 industrial availability, and SOIC package compatibility with legacy PCB layouts.
Supply support for LMH6504MAX 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 for industrial, automotive, and communications markets.
The LMH6504MAX belongs to TI's high-speed amplifier product line, engineered specifically for analog signal conditioning in video, instrumentation, and RF receiver front-ends where wide bandwidth, low distortion, and precise analog gain control are essential.
FAQ
What is the maximum recommended AVMAX for stable operation of the LMH6504MAX?
The LMH6504MAX is specified at AVMAX = 9.7 V/V, but TI recommends AVMAX between 2 and 100 V/V depending on application tradeoffs. Higher gains increase sensitivity to input offset and noise; for best distortion performance at 20 MHz, AVMAX ≤ 20 V/V is advised. The LMH6504MAX datasheet confirms AVMAX = 100 V/V is achievable with RF = 2.4 kΩ and RG = 27 Ω, though THD degrades above −45 dBc.
Can the LMH6504MAX operate from a single +10 V supply?
Yes-the LMH6504MAX supports single-supply operation with V+ = +10 V and V− = GND, provided pin 4 (GND) is biased to a virtual half-supply (~5 V) using a low-impedance divider or regulator. VG must then swing 0–2 V relative to that 5 V reference, and VIN must remain within ±1.8 V of the virtual ground. This configuration is validated in TI's Application Note SNOSA96D Figure 42.
What is the purpose of the X1 pin (pin 8) on the LMH6504MAX?
The X1 pin (pin 8) is the internal node connecting the output of the transconductance input buffer to the gain cell input. It is not intended for external connection in standard operation. TI's datasheet shows it internally routed and unconnected externally; misuse may disrupt biasing or cause instability. For custom topologies requiring access to this node, consult TI's LMH6504 application notes before implementation.
How does the LMH6504MAX achieve 150 MHz gain control bandwidth?
The LMH6504MAX achieves 150 MHz gain control bandwidth through its monolithic current-feedback amplifier architecture and optimized gain cell layout. Unlike voltage-feedback VGAs, its gain control path avoids dominant-pole compensation-enabling fast VG-to-output response. Electrical Characteristics table confirms CT (feed-through) remains ≤−53 dB at 30 MHz, validating full 150 MHz control BW per Figure 4 in SNOSA96D.
Is the LMH6504MAX pin-compatible with the CLC5523 it replaces?
Yes-the LMH6504MAX is a functional replacement for the CLC5523 and shares identical 8-pin SOIC pinout (D0008A), including matching VG (pin 1), VIN (pin 2), RG (pin 3), GND (pin 4), V+ (pin 5), VOUT (pin 6), V− (pin 7), and X1 (pin 8) assignments. TI explicitly states "Replacement for CLC5523" in the Features section of SNOSA96D, confirming drop-in compatibility for legacy designs.
LMH6504MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1500V/µs
- Gain Bandwidth Product:
- 150 MHz
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 900 nA
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 11mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMH6504MAX FAQ
1.How can I place an order for LMH6504MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6504MAX 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 LMH6504MAX reliable?
The price and inventory of LMH6504MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6504MAX is usually 5 days.
3.What payment methods are accepted for LMH6504MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6504MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6504MAX?
LMH6504MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6504MAX 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 LMH6504MAX?
For technical support, including LMH6504MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6504MAX requirements.
6.How does Aetrix verify that LMH6504MAX is sourced from the original manufacturer or authorized distributors?
All LMH6504MAX 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 LMH6504MAX meets industry standards.
7.What is the process for return or replacement of LMH6504MAX?
All LMH6504MAX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6504MAX, 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 LMH6504MAX part is unused and in its original packaging.
Return procedure for LMH6504MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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