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Texas Instruments LMH6503MA/NOPB
- Part No.:
- LMH6503MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6503MA/NOPB.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
LMH6503MA/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 control interface (−1V to +1V), high-speed current-feedback output stage, and delivers ±75mA linear output current into 100Ω loads - used in RF signal chains for automatic gain control and variable attenuation in test equipment and broadband receivers.
For engineers reviewing the LMH6503MA/NOPB datasheet, LMH6503MA/NOPB pinout, LMH6503MA/NOPB application, or LMH6503MA/NOPB equivalent, key selection criteria include its guaranteed ±0.7dB gain matching at maximum gain, 6.6nV/√Hz input voltage noise, −57dBc THD at 20MHz, and compatibility with ±2.5V to ±6V dual supplies - critical for precision analog front-ends requiring stable gain linearity and low distortion across temperature.
Technical Context
The LMH6503MA/NOPB implements a two-stage architecture: first, differential input buffers convert VIN_DIFF to a proportional current (IRG) set by RG; second, a voltage-controlled multiplier (K ≈ 1.72) scales IRG based on VG, followed by a current-feedback op amp (CFB) transimpedance stage with gain determined by RF. Gain is precisely expressed as AV = (RF/RG) × K × (VG + 1)/2, enabling predictable V/V scaling across −1V ≤ VG ≤ +1V.
Its CFB output stage provides 1800V/µs slew rate and drives heavy capacitive or resistive loads without stability compromise, while differential inputs deliver >67dB CMRR and support common-mode rejection in noisy environments. Input bias current drift is limited to 100nA/°C, and output offset remains <±350mV over full VG range - enabling accurate DC-coupled gain control in instrumentation-grade designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 135MHz at AV(MAX) = 10 - supports baseband-to-RF signal conditioning up to UHF without external compensation. |
| Gain Control Bandwidth | 100MHz - enables fast AGC loop response with minimal phase lag in dynamic signal environments. |
| Gain Adjustment Range | 70dB typical (f < 10MHz) - allows >3000:1 linear V/V gain scaling from cutoff to full gain with ±0.7dB matching. |
| Slew Rate | 1800V/µs - sustains large-signal fidelity (e.g., 4V step) in high-speed pulse amplification and video applications. |
| Input Voltage Noise | 6.6nV/√Hz - ensures low-noise amplification of weak signals in spectrum analyzers and medical imaging front-ends. |
| THD @ 20MHz | −57dBc (RL = 100Ω, VO = 2VPP) - meets stringent distortion requirements in communications transceivers and ADC driver stages. |
| Supply Current | 37mA (no load, ±5V) - balances high-speed performance with moderate power consumption for portable test gear. |
Pinout & Package
LMH6503MA/NOPB is housed in a 14-pin SOIC package (Package Code: D0014A), with exposed pad not present. Pin functions are validated per TI SNOSA78E Rev. April 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | V+ / V− Supply Rails | Accept ±2.5V to ±6V dual supplies; thermal resistance θJA = 138°C/W enables operation up to +85°C ambient. |
| 2 | VG (Gain Control) | High-impedance (70kΩ) input accepting −1V to +1V linear control voltage; 45µA bias current at 1.4V. |
| 3, 6 | +VIN / −VIN Differential Inputs | DC-coupled, 750kΩ input resistance; ±2.2V common-mode range supports rail-to-rail input signal handling. |
| 10 | VOUT | Current-feedback output capable of ±75mA into 100Ω; ±3.2V swing ensures full-scale drive for 50Ω/75Ω systems. |
| 11 | GND | Ground reference for VG and internal biasing; must be low-impedance to minimize feedthrough and offset drift. |
| 4, 5, 7, 8, 9, 12, 13 | NC / Reserved / Internal Nodes | No external connection required; pins 4/5 route RG current, pins 7/8/9/12/13 are internally tied or unused. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-V/V gain control | Gain scales precisely as (VG + 1)/2 × (RF/RG) × 1.72 - eliminates logarithmic lookup tables in AGC firmware. |
| Differential input architecture | 67dB CMRR and 5pF input capacitance enable robust noise rejection in long-line sensor interfaces and RF mixers. |
| Current-feedback output stage | 1800V/µs slew rate and 0.1Ω output impedance maintain stability driving 100pF+ capacitive loads without compensation. |
| DC-coupled signal path | Output offset <±350mV over full VG range allows direct connection to ADCs or downstream DC-coupled stages. |
| Temperature-stable gain matching | ±0.7dB device-to-device gain tolerance at max gain ensures consistent channel balancing in multi-path receivers. |
Applications
| RF Automatic Gain Control | Video Signal Conditioning |
|---|---|
|
Use Scenario: Dynamic amplitude stabilization of IF signals in software-defined radio receivers operating from 10kHz–100MHz. IC Role / Device Role / Timing Role: VGA core in closed-loop AGC circuit, adjusting gain in real time via DAC-driven VG pin to maintain constant ADC input level. Use Value: 70dB gain range and 100MHz control bandwidth enable sub-microsecond response to bursty RF interference without overshoot. |
Use Scenario: DC-coupled gain adjustment and level shifting in broadcast-quality SD/HD video line drivers. IC Role / Device Role / Timing Role: Precision video amplifier with adjustable black-level and gain control, interfacing directly to 75Ω coaxial outputs. Use Value: 6.6nV/√Hz noise and −57dBc THD preserve color fidelity and luma integrity across 0–30MHz video bandwidth. |
| Test Equipment Signal Generator | Medical Ultrasound Beamformer |
|
Use Scenario: Programmable output amplitude control in benchtop RF signal generators delivering calibrated sine waves from 1kHz–100MHz. IC Role / Device Role / Timing Role: Final-stage gain modulator, converting digital amplitude commands into precise analog output levels with minimal harmonic distortion. Use Value: ±0.7dB gain matching across units ensures traceable amplitude accuracy across production calibration batches. |
Use Scenario: Channel-specific gain control in phased-array ultrasound front-end ASICs, compensating for transducer sensitivity variations. IC Role / Device Role / Timing Role: Low-noise, wideband VGA per receive channel, synchronized to beam-steering timing with sub-ns group delay flatness. Use Value: 2.6ns group delay variation (DC–130MHz) and 1.6° linear phase deviation prevent beam-forming errors in real-time imaging. |
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 (dB-linear) gain control; 120MHz BW; no differential inputs; single-ended only. | Better suited for wide-dynamic-range RSSI detection where dB-linear response simplifies envelope tracking. | Select LMH6502MA/NOPB when logarithmic gain law is required and differential input rejection is unnecessary. |
| AD8367ARUZ | 500MHz bandwidth; 45dB gain range; requires external op amp for DC coupling; higher supply current (50mA). | Preferred for microwave IF stages (>200MHz) where bandwidth outweighs DC coupling and low-noise priority. | Choose AD8367ARUZ for >200MHz applications needing wider bandwidth, accepting trade-offs in noise and DC coupling. |
Compared with LMH6503MA/NOPB, LMH6502MA/NOPB offers logarithmic gain scaling ideal for RSSI but lacks differential inputs and DC coupling, while AD8367ARUZ delivers higher bandwidth at the cost of increased power and loss of true DC gain control - making LMH6503MA/NOPB optimal for precision, wideband, DC-coupled analog signal chains.
Availability
LMH6503MA/NOPB is available at Aetrix Electronics and suitable for RF automatic gain control, video signal conditioning, test equipment signal generation, and medical ultrasound beamforming requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMH6503MA/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 decades of expertise in high-speed amplifier design and manufacturing.
The LMH6503MA/NOPB belongs to TI's LMH™ high-speed amplifier product line, engineered specifically for wideband, DC-coupled, precision gain control in instrumentation, communications, and medical imaging systems.
FAQ
What is the maximum supply voltage range supported by the LMH6503MA/NOPB?
The LMH6503MA/NOPB operates from ±2.5V to ±6V dual supplies (5V to 12V total), with absolute maximum ratings of ±6.3V per rail. At ±5V, it draws 37mA quiescent current and delivers full 135MHz bandwidth and ±3.2V output swing into 100Ω. Operation at ±2.5V reduces bandwidth to ~50MHz but maintains functional gain control and linearity - verified in TI SNOSA78E Figure 22.
How does the LMH6503MA/NOPB achieve linear-in-V/V gain control?
The LMH6503MA/NOPB achieves linear-in-V/V gain through an internal current-mode architecture: input differential voltage sets IRG = VIN_DIFF / RG; this current is multiplied by a fixed gain factor K ≈ 1.72 and then scaled by (VG + 1)/2 before conversion to output voltage via RF. The resulting gain equation AV = (RF/RG) × K × (VG + 1)/2 yields exact V/V proportionality - confirmed in TI SNOSA78E Application Information section.
Can the LMH6503MA/NOPB be used in single-supply configurations?
Yes - the LMH6503MA/NOPB supports single-supply operation by biasing the GND pin (pin 11) to a virtual half-supply (e.g., VCC/2), with VG referenced to that node. Input common-mode range extends to ±2.2V, and output swings to within 0.8V of rails. TI recommends using matched input termination and decoupling to maintain PSRR (>57dB) and avoid CMRR degradation - details in SNOSA78E Figure 1 and Application Information.
What is the guaranteed gain matching specification for LMH6503MA/NOPB across production units?
LMH6503MA/NOPB guarantees ±0.7dB gain matching between devices at maximum gain (VG = +1V), as specified in TI SNOSA78E Electrical Characteristics table under "G Match". This tolerance holds over temperature (−40°C to +85°C) and ensures consistent channel gain in multi-channel systems like phased-array receivers or parallel test instrument channels.
Does the LMH6503MA/NOPB require external compensation components for stability?
No - the LMH6503MA/NOPB's current-feedback output stage is internally compensated for unity-gain stability with RF ≥ 910Ω and RG ≥ 174Ω, as validated in TI SNOSA78E Figure 4–5 and Typical Performance Characteristics. Stability is maintained across all gain settings and load conditions up to 100pF; adding series resistance at VOUT may further improve capacitive load drive if needed.
LMH6503MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6503MA/NOPB FAQ
1.How can I place an order for LMH6503MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6503MA/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 LMH6503MA/NOPB reliable?
The price and inventory of LMH6503MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6503MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6503MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6503MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6503MA/NOPB?
LMH6503MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6503MA/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 LMH6503MA/NOPB?
For technical support, including LMH6503MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6503MA/NOPB requirements.
6.How does Aetrix verify that LMH6503MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6503MA/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 LMH6503MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6503MA/NOPB?
All LMH6503MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6503MA/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 LMH6503MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6503MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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