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Texas Instruments LMH6504MA/NOPB
- Part No.:
- LMH6504MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6504MA/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,843
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Product details
Overview
LMH6504MA/NOPB 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 LMH6504MA/NOPB datasheet, LMH6504MA/NOPB pinout, LMH6504MA/NOPB application, or LMH6504MA/NOPB equivalent, key selection criteria include gain control linearity (±0.42 dB matching), feed-through suppression (−53 dB at 30 MHz), supply current (11 mA typical), thermal stability across −40°C to +85°C, and SOIC-8 compatibility with single- or dual-supply operation.
Technical Context
The LMH6504MA/NOPB implements a three-stage architecture: a transconductance input buffer (gain set by RG), a voltage-controlled multiplier core (linear-in-dB response via VG input), and a current-feedback output amplifier (gain set by RF). Its gain control function follows a hyperbolic tangent relationship, enabling soft limiting at maximum gain and broad linear-in-dB behavior below 1 V control voltage.
Gain flatness is ±0.2 dB up to 26 MHz and ±0.1 dB up to 9.5 MHz relative to AVMAX; feed-through is −53 dB at 30 MHz when VG = 0 V. The device supports resistor-programmable AVMAX from 2 V/V to 100 V/V (e.g., RF = 1 kΩ, RG = 100 Ω yields 9.7 V/V), with K = 0.965 nominal gain multiplier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports high-frequency video and IF signal paths without external compensation |
| Gain Adjustment Range | 80 dB (<10 MHz) - enables full attenuation to cutoff for dynamic range compression in AGC systems |
| Slew Rate (inverting) | 1500 V/μs - ensures faithful reproduction of fast transient signals in pulse-based imaging |
| Output Offset Voltage | ±55 mV over 0–2 V VG range - minimizes DC error accumulation in cascaded analog signal chains |
| Supply Current | 11 mA (no load, ±5 V) - enables low-power portable and battery-backed instrumentation |
| Input Noise Voltage | 4.4 nV/√Hz - preserves SNR in front-end amplification of weak sensor or RF signals |
| Gain Matching | ±0.42 dB at max gain - critical for channel-to-channel consistency in multi-path receivers |
| THD @ 20 MHz | −45 dBc (2 VPP, RL = 100 Ω) - meets broadcast-grade video distortion requirements |
Pinout & Package
LMH6504MA/NOPB is housed in an 8-pin SOIC package (Package Number D0008A), with exposed pad not present and RoHS-compliant lead finish. Pin 4 is GND reference for VG and RG biasing; pin 3 (RG) sets input transconductance; pin 1 (VG) accepts 0–2 V control voltage referenced to pin 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VG) | Gain Control Input | High-impedance (25 MΩ) node accepting 0–2 V DC to set gain linearly in dB; must not exceed +2.3 V |
| 2 (VIN) | Inverting Input | Differential input node with ±3.2 V common-mode range; requires external RG to ground or virtual mid-rail |
| 3 (RG) | Gain Setting Resistor Terminal | Connects to external RG (e.g., 100 Ω); determines input voltage range and AVMAX via K·RF/RG |
| 4 (GND) | Ground Reference | Reference for VG, RG, and internal biasing; tied to virtual mid-rail in single-supply configurations |
| 5 (V−) | Negative Supply | Accepts −3.5 V to −6 V; supports dual-supply operation down to ±3.5 V total supply |
| 6 (VOUT) | Output | Current-feedback output capable of ±60 mA into 100 Ω; swing ±2.2 V with 100 Ω load |
| 7 (V+) | Positive Supply | Accepts +3.5 V to +6 V; total supply range 7–12 V (±3.5 V to ±6 V) |
| 8 (X1) | Non-inverting Input | Internally connected to input buffer; unused in standard configuration but enables differential input variants |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | Enables stable closed-loop AGC with predictable 1 dB/V sensitivity and soft saturation at extremes |
| Resistor-programmable AVMAX | AVMAX = K·RF/RG allows precise gain setting (2–100 V/V) without trimming or calibration |
| High-Z VG and VIN inputs | 25 MΩ VG impedance and 7 MΩ input resistance simplify drive circuitry and reduce loading errors |
| Current-feedback output stage | Delivers 1500 V/μs inverting slew rate and maintains bandwidth independent of closed-loop gain |
| Single-supply compatible | Operates with VG referenced to virtual mid-rail (e.g., V+/2), enabling 0–2 V control in 5 V systems |
| Low distortion at 20 MHz | −45 dBc THD supports composite video and digital IF applications without post-filtering |
Applications
| Video Imaging Processing | Automatic Gain Control (AGC) |
|---|---|
Use Scenario: Amplifying analog RGB or YUV signals in medical endoscopes and industrial machine vision cameras before ADC sampling. IC Role / Device Role / Timing Role: VGA front-end providing programmable gain to maintain consistent pixel amplitude across varying illumination conditions. Use Value: 80 dB dynamic range and ±0.42 dB gain matching ensure uniform image brightness and eliminate channel skew in multi-sensor arrays. | Use Scenario: Closed-loop RF receiver path where signal strength varies >60 dB due to antenna coupling or fading. IC Role / Device Role / Timing Role: Core gain element in feedback loop, adjusting amplification in real time based on detector output. Use Value: Linear-in-dB response enables proportional control action; 150 MHz bandwidth supports IF frequencies up to 70 MHz without phase lag. |
| Variable Attenuator | Voltage-Controlled Filter |
Use Scenario: Precision test equipment requiring calibrated, stepless attenuation of 10–100 MHz sine waves during calibration sweeps. IC Role / Device Role / Timing Role: Digitally controlled attenuator replacing mechanical potentiometers or relay-switched resistor networks. Use Value: 0.1 dB flatness over 9.5 MHz eliminates need for per-frequency correction tables; ±55 mV offset avoids DC drift in AC-coupled paths. | Use Scenario: Tunable anti-aliasing or reconstruction filter in software-defined radio transceivers with adaptive bandwidth. IC Role / Device Role / Timing Role: Gain-setting element in active filter topology (e.g., biquad), modulating Q and cutoff frequency via VG. Use Value: Feed-through <−53 dB at 30 MHz prevents passband leakage; 4.4 nV/√Hz noise preserves filter SNR at low gain settings. |
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/NOPB | 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., DAC-driven), less ideal for analog AGC loops | Select when gain law must be strictly proportional to control voltage, not logarithmic |
| AD8370ACPZ-R7 | 500 MHz bandwidth; 5.5 V supply; integrated 10-bit SPI interface; 25 dB gain range | Requires digital control infrastructure; higher cost; optimized for broadband communications, not video | Select when serial programming, wider bandwidth, or tighter gain step resolution is required |
Compared with LMH6504MA/NOPB, LMH6503MA/NOPB trades AGC suitability for simpler linear control, while AD8370ACPZ-R7 adds digital configurability at the expense of analog simplicity and cost-making LMH6504MA/NOPB optimal for analog-centric, wide-dynamic-range video and IF gain control.
Availability
LMH6504MA/NOPB is available at Aetrix Electronics and suitable for video imaging processing, automatic gain control, and variable attenuator applications requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for LMH6504MA/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, performance, and design enablement.
The LMH6504MA/NOPB belongs to TI's high-speed amplifier product line, engineered specifically for wideband analog signal conditioning in video, communications, and test equipment where precision gain control and low distortion are essential.
FAQ
What is the maximum recommended supply voltage for LMH6504MA/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6504MA/NOPB is 12.6 V, but the recommended operating range is 7 V to 12 V total. At ±5 V supplies, it delivers 150 MHz bandwidth and 11 mA quiescent current. Exceeding ±6 V risks exceeding junction temperature limits and degrading gain matching or noise performance. LMH6504MA/NOPB must never operate beyond its specified thermal resistance (θJA = 165°C/W for SOIC).
Can LMH6504MA/NOPB operate from a single 5 V supply?
Yes, LMH6504MA/NOPB supports single-supply operation by biasing pin 4 (GND) and the RG resistor to a stable virtual mid-rail (e.g., 2.5 V). VG must then swing 0–2 V relative to that mid-rail, and VIN must remain within ±1.8 V of the mid-rail. This configuration centers VOUT at the mid-rail and preserves full dynamic range-enabling use in portable 5 V systems without negative rail generation. LMH6504MA/NOPB's high-impedance inputs simplify mid-rail buffering.
What is the gain accuracy specification for LMH6504MA/NOPB across its control voltage range?
LMH6504MA/NOPB exhibits ±0.45 dB typical gain accuracy (vs. theoretical tanh-based model) at VG = 2.0 V, and ±3.9 dB maximum deviation across 0.8 V < VG < 2.0 V. Accuracy degrades near VG = 0 V due to feed-through; for critical applications, calibration at two points (e.g., VG = 0.5 V and VG = 1.5 V) corrects residual nonlinearity. LMH6504MA/NOPB's gain matching of ±0.42 dB at max gain ensures repeatability across units without per-device trimming.
How does LMH6504MA/NOPB achieve 1500 V/μs slew rate in inverting mode?
LMH6504MA/NOPB achieves 1500 V/μs inverting slew rate because the input buffer remains at fixed DC potential, eliminating its slew-limiting effect. In the inverting configuration (RG to VIN, VIN pin grounded via 25 Ω), only the current-feedback output stage responds to fast transitions-bypassing the slower transconductance input stage that dominates non-inverting slew rate. This architecture makes LMH6504MA/NOPB especially effective for pulse-amplification tasks where edge fidelity is critical.
Is LMH6504MA/NOPB pin-compatible with CLC5523?
Yes, LMH6504MA/NOPB is a direct replacement for CLC5523 in SOIC-8 packages, sharing identical pinout, supply ranges, and functional block diagram. TI explicitly lists CLC5523 as a legacy part superseded by LMH6504MA/NOPB, with improvements including lower supply current (11 mA vs. 13 mA), better gain matching (±0.42 dB vs. ±0.5 dB), and enhanced THD (−45 dBc vs. −42 dBc at 20 MHz). No PCB changes are required when upgrading from CLC5523 to LMH6504MA/NOPB.
LMH6504MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6504MA/NOPB FAQ
1.How can I place an order for LMH6504MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6504MA/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 LMH6504MA/NOPB reliable?
The price and inventory of LMH6504MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6504MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6504MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6504MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6504MA/NOPB?
LMH6504MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6504MA/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 LMH6504MA/NOPB?
For technical support, including LMH6504MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6504MA/NOPB requirements.
6.How does Aetrix verify that LMH6504MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6504MA/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 LMH6504MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6504MA/NOPB?
All LMH6504MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6504MA/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 LMH6504MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6504MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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