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Texas Instruments LMH6503MTX/NOPB
- Part No.:
- LMH6503MTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMH6503MTX/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,760
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Product details
Overview
LMH6503MTX/NOPB from Texas Instruments is a wideband, DC-coupled, differential-input voltage-controlled gain amplifier (VGA) with 135MHz −3dB bandwidth, 100MHz gain control bandwidth, and 70dB typical gain adjustment range over 10MHz. It integrates a linear-in-V/V gain core followed by a high-speed current-feedback op amp output stage capable of ±75mA linear output current and ±3.2V output swing into 100Ω - used in RF signal chains, automatic gain control loops, and video line drivers.
For engineers reviewing the LMH6503MTX/NOPB datasheet, LMH6503MTX/NOPB pinout, LMH6503MTX/NOPB application, or LMH6503MTX/NOPB equivalent, key selection criteria include gain linearity vs. VG (±0.7dB matching), input-referred noise (6.6nV/√Hz), slew rate (1800V/µs), THD at 20MHz (−57dBc), and dual SOIC-14/TSSOP-14 package compatibility with ±5V or ±2.5V supplies.
Technical Context
The LMH6503MTX/NOPB implements a two-stage architecture: first, differential input buffers convert VIN_DIFF to a gain-setting current (IRG = VIN_DIFF / RG); second, a voltage-controlled multiplier (K × (VG + 1)/2, K = 1.72 typ) scales IRG before transimpedance conversion via RF. Gain is fully programmable from cutoff to AVMAX = 10–100V/V using external RG and RF resistors.
Its current-feedback output stage delivers high slew rate (1800V/µs) and low group delay (2.6ns DC–130MHz), while maintaining ±0.2dB gain flatness up to 20MHz and linear phase deviation <1.6° up to 60MHz - enabling stable operation in wideband AGC and IF sampling applications without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 135MHz at AV(MAX) = 10 - supports baseband-to-IF amplification up to UHF without roll-off-induced distortion. |
| Gain Control BW | 100MHz - enables fast gain settling for dynamic signal conditioning in burst-mode receivers. |
| Gain Adjustment Range | 70dB (f < 10MHz) - provides precise attenuation control across multi-decade amplitude ranges in AGC systems. |
| Slew Rate | 1800V/µs - ensures faithful reproduction of fast-rising video or radar pulses without slew-induced distortion. |
| Input Voltage Noise | 6.6nV/√Hz - preserves SNR in low-level signal amplification stages preceding ADCs or mixers. |
| THD @ 20MHz | −57dBc into 100Ω - meets broadcast-grade video and communications spectral purity requirements. |
| Supply Current | 37mA (no load, ±5V) - balances performance and power efficiency in portable or thermally constrained designs. |
| Output Current | ±75mA linear - drives 100Ω loads directly, eliminating need for external buffer stages in video distribution. |
Pinout & Package
LMH6503MTX/NOPB is packaged in a 14-pin TSSOP (PW0014A) with exposed thermal pad, optimized for high-frequency layout and thermal dissipation (θJA = 160°C/W). Pin assignment matches SOIC-14 but requires tighter trace routing due to smaller pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply rail | Connects to −5V or −2.5V; must be decoupled locally to suppress PSRR degradation above 1MHz. |
| 2 (VG) | Gain control voltage input | Accepts −1V to +1V linear control; 70kΩ input resistance simplifies DAC or op-amp drive. |
| 3 (+VIN) | Differential positive input | High-impedance (750kΩ), 5pF input; common-mode range ±2.2V allows ground-referenced or level-shifted inputs. |
| 4,5 (RG) | Gain-setting resistor terminals | Current source/sink pair sets IRG = VIN_DIFF / RG; defines maximum gain with RF. |
| 6 (−VIN) | Differential negative input | Matches +VIN for >67dB CMRR; unused pin tied to ground or virtual mid-supply in single-ended use. |
| 7 (V−) | Second negative supply connection | Shared with Pin 1; improves supply rejection and reduces ground bounce in high-speed switching. |
| 8 (VREF) | Reference voltage output | Provides stable 0V reference for single-supply biasing; not internally connected to VCM node. |
| 9 (VOUT) | Amplified output | Current-feedback output capable of ±3.2V into 100Ω; requires 0.1µF ceramic decoupling near pin. |
| 10 (GND) | Analog ground | Primary ground return for input/output signals; must be star-connected to minimize noise coupling. |
| 11 (I−) | Current feedback node | Internal CFB amplifier inverting input; not accessible externally - used only for internal stability. |
| 12 (NC) | No connect | Internally unconnected; must remain floating per TI design guidelines. |
| 13 (V+) | Positive supply rail | Connects to +5V or +2.5V; bypass with 100nF ceramic + 10µF tantalum for broadband suppression. |
| 14 (V+) | Second positive supply connection | Shared with Pin 13; reduces supply impedance and improves PSRR at high frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Differential input architecture | Enables >67dB CMRR at DC–10MHz, rejecting common-mode noise on long PCB traces or coaxial feeds. |
| Linear-in-V/V gain control | Eliminates logarithmic lookup tables or calibration in FPGA/DSP-based AGC, reducing firmware overhead. |
| Integrated current-feedback output | Delivers 1800V/µs slew rate and 135MHz bandwidth without external compensation components. |
| ±0.7dB gain matching | Ensures consistent channel-to-channel gain in multi-path systems (e.g., phased-array receivers) without per-unit trimming. |
| DC-coupled signal path | Supports baseband video, instrumentation, and digital modulation waveforms without AC-coupling capacitors or drift errors. |
| Single-supply compatible operation | VG range (−1V to +1V relative to Pin 11) and VREF output simplify implementation in 3.3V or 5V-only systems. |
Applications
| Video Line Driver | RF Automatic Gain Control |
|---|---|
Use Scenario: Driving analog RGB or YPbPr video signals over 75Ω coaxial cable to multiple monitors or capture cards. IC Role / Device Role / Timing Role: DC-coupled VGA providing programmable gain to compensate for variable cable loss and maintain constant output amplitude. Use Value: Eliminates need for external DC restoration or clamping circuits while delivering ±3.2V swing and −57dBc THD at 20MHz. | Use Scenario: Closed-loop gain control in direct-conversion receivers where RSSI detection adjusts signal level prior to ADC sampling. IC Role / Device Role / Timing Role: Wideband VGA with 100MHz gain control bandwidth enabling real-time correction of burst-mode or pulsed RF signals. Use Value: 70dB gain range and ±0.7dB matching ensure accurate amplitude control across diverse signal strengths without calibration drift. |
| Programmable Filter Stage | High-Speed Multiplier |
Use Scenario: Implementing tunable low-pass or band-pass response in software-defined radio front ends using gain-controlled feedback networks. IC Role / Device Role / Timing Role: Voltage-controlled gain element in active filter topologies where VG sets cutoff frequency or Q-factor dynamically. Use Value: Linear-in-V/V transfer function and 135MHz bandwidth allow precise, wideband filter reconfiguration without phase discontinuity. | Use Scenario: Analog multiplication of baseband I/Q signals with carrier envelope in vector modulators or AM/SSB transmitters. IC Role / Device Role / Timing Role: Two-quadrant analog multiplier with gain proportional to (VG + 1)/2, enabling amplitude modulation without discrete multipliers. Use Value: Integrated architecture avoids external op-amps and multipliers, reducing component count and inter-stage mismatch errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-controlled gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6502MA/NOPB | Logarithmic-in-dB gain control (not linear-in-V/V); 100MHz bandwidth; same SOIC-14/TSSOP-14 footprint. | Preferred for dB-linear AGC where exponential gain law matches detector output; unsuitable for linear V/V scaling. | Select LMH6502MA/NOPB when system uses RSSI detectors with logarithmic output or requires constant-dB/step resolution. |
| AD8367ARUZ | 500MHz bandwidth; 45dB gain range; requires external biasing; 16-lead TSSOP; higher supply current (55mA). | Better suited for microwave IF stages (>100MHz) and higher-frequency test equipment; lacks DC coupling. | Choose AD8367ARUZ for >200MHz applications or when wider bandwidth outweighs DC-coupling requirement. |
Compared with LMH6502MA/NOPB, LMH6503MTX/NOPB offers superior linearity in V/V control and DC coupling, while AD8367ARUZ trades off low-frequency capability for extended RF bandwidth - making LMH6503MTX/NOPB optimal for video, baseband, and sub-200MHz IF gain control.
Availability
LMH6503MTX/NOPB is available at Aetrix Electronics and suitable for video line driving, RF automatic gain control, and programmable filter applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for LMH6503MTX/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 specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in high-performance signal chain solutions.
The LMH6503MTX/NOPB belongs to TI's LMH™ high-speed amplifier family, engineered for wideband, precision gain control in demanding video, communications, and instrumentation systems where linearity, speed, and DC fidelity are critical.
FAQ
What is the maximum supply voltage range supported by LMH6503MTX/NOPB?
The LMH6503MTX/NOPB operates with a total supply voltage range of ±2.5V to ±6.3V (i.e., 5V to 12.6V between V+ and V− rails). Absolute maximum rating is ±6.3V; recommended operating range is ±5V for optimal distortion and bandwidth performance. At ±2.5V, bandwidth reduces to ~50MHz and THD degrades slightly, but functionality remains intact.
How does LMH6503MTX/NOPB achieve linear-in-V/V gain control?
The LMH6503MTX/NOPB achieves linear-in-V/V gain through an internal two-quadrant voltage-controlled multiplier with transfer function K × (VG + 1)/2, where K = 1.72 (typical). With VG ranging from −1V to +1V, gain scales linearly from 0× to 2K× the base gain set by RF/RG - enabling direct DAC-driven control without logarithmic conversion or lookup tables.
Can LMH6503MTX/NOPB be used in single-supply configurations?
Yes, LMH6503MTX/NOPB supports single-supply operation. Pin 11 (VREF) provides a stable 0V reference, and the VG input is referenced to this node (−1V to +1V relative to VREF). Input common-mode range extends to ±2.2V, allowing use with virtual ground biasing. External level-shifting circuitry may be needed for full-rail input signals.
What is the purpose of Pins 4 and 5 (RG terminals) on LMH6503MTX/NOPB?
Pins 4 and 5 form the differential terminals of the internal gain-setting current source. They accept an external resistor (RG) that converts differential input voltage (VIN_DIFF) into a proportional current (IRG = VIN_DIFF / RG). This current defines the full-scale gain along with RF and the multiplier coefficient K - making RG a critical component for setting AVMAX and bandwidth.
Does LMH6503MTX/NOPB require external compensation components?
No, LMH6503MTX/NOPB is internally compensated and does not require external compensation components. Its current-feedback output architecture is stable with standard RF and RG values (e.g., RF = 1kΩ, RG = 174Ω). Bandwidth can be reduced predictably by increasing RG or RF, but no capacitor or resistor network is needed for unity-gain stability.
LMH6503MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1800V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 135 MHz
- Current - Input Bias:
- 11 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 37mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LMH6503MTX/NOPB FAQ
1.How can I place an order for LMH6503MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6503MTX/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 LMH6503MTX/NOPB reliable?
The price and inventory of LMH6503MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6503MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6503MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6503MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6503MTX/NOPB?
LMH6503MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6503MTX/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 LMH6503MTX/NOPB?
For technical support, including LMH6503MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6503MTX/NOPB requirements.
6.How does Aetrix verify that LMH6503MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6503MTX/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 LMH6503MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6503MTX/NOPB?
All LMH6503MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6503MTX/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 LMH6503MTX/NOPB part is unused and in its original packaging.
Return procedure for LMH6503MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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