My Inquiry
My Account
Texas Instruments LMH6505MMX
- Part No.:
- LMH6505MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6505MMX.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMH6505MMX from Texas Instruments is a wideband, low-power, linear-in-dB variable gain amplifier (VGA) featuring 150 MHz −3 dB bandwidth, 100 MHz gain control bandwidth, and 80 dB attenuation range (f < 10 MHz). It employs a current-feedback output stage capable of ±60 mA drive into low-impedance loads and is optimized for automatic gain control (AGC) in RF/IF signal chains and video imaging processing.
For engineers reviewing the LMH6505MMX datasheet, LMH6505MMX pinout, LMH6505MMX application, or LMH6505MMX equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in AGC and voltage-controlled filtering, and two technically documented alternative VGAs with quantified performance trade-offs.
Technical Context
The LMH6505MMX integrates a transconductance input buffer, voltage-controlled multiplier cell, and high-speed current-feedback amplifier (CFA) output stage. Its gain is set by external resistors RG (input gain-setting) and RF (output transimpedance), with AVMAX = K·RF/RG (K = 0.940 typical). Gain control is linear-in-dB over 0–2 V VG input, enabling precise AGC loop implementation without logarithmic conversion circuitry.
It operates from ±3.5 V to ±6 V supplies (7–12 V total), supports dual- or single-supply configurations via virtual ground at pin 4 (GND), and maintains ≤±0.50 dB gain matching at maximum gain. Input bias current is −2.5 µA (typ), input impedance is 7 MΩ, and output swing reaches ±2.4 V into 100 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 150 MHz - supports wideband IF/RF signal paths up to UHF without external compensation |
| Gain Control Bandwidth | 100 MHz - enables fast AGC response to transient amplitude changes in real-time systems |
| Attenuation Range | 80 dB (f < 10 MHz) - sufficient for dynamic range compression in radar receivers and CATV line drivers |
| Slew Rate (Inverting) | 1500 V/μs - sustains large-signal fidelity at high frequencies without slew-induced distortion |
| Supply Current (No Load) | 11 mA - enables low-power portable instrumentation and battery-backed signal conditioning |
| Input Noise Voltage | 4.4 nV/√Hz - preserves SNR in front-end amplification stages before ADC sampling |
| Output Drive Capability | ±60 mA - directly drives 50 Ω or 75 Ω transmission lines without external buffers |
Pinout & Package
LMH6505MMX is packaged in an 8-pin VSSOP (DGK) with 0.65 mm pitch, measuring 3.0 mm × 3.0 mm × 1.0 mm. This thermally enhanced, space-constrained package supports high-density PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VG | Gain Control Input | High-impedance (25 MΩ) analog voltage input (0–2 V) that sets gain linearly in dB; referenced to pin 4 (GND) |
| 2 - VIN | Inverting Input | Differential input node with ±0.74 V common-mode range (RG = 100 Ω); accepts DC-coupled or AC-coupled signals |
| 3 - RG | Gain-Setting Resistor Terminal | Connects external resistor (e.g., 100 Ω) to set transconductance gain; carries ±7.4 mA max DC current |
| 4 - GND | Ground Reference / Virtual Ground | Reference point for VG and RG; in single-supply operation, tied to "virtual half-supply" for level-shifting |
| 5 - V+ | Positive Supply Rail | Accepts +3.5 V to +6 V; PSRR = −72 dB (typ) ensures stable gain under supply ripple |
| 6 - VOUT | Amplified Output | Current-feedback output capable of ±2.4 V swing into 100 Ω; low 0.12 Ω output impedance minimizes loading effects |
| 7 - V− | Negative Supply Rail | Accepts −3.5 V to −6 V; −PSRR = −75 dB (typ) suppresses negative rail noise coupling |
| 8 - X1 | Non-Inverting Input / Buffer Output | Internal node accessible for feedback or monitoring; not intended for external connection in standard configuration |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB gain control | 0–2 V VG input yields 80 dB attenuation range with ≤±0.50 dB gain matching - eliminates need for external log amps in AGC loops |
| Resistor-programmable AVMAX | Set via RF/RG ratio (e.g., RF = 1 kΩ, RG = 100 Ω → AVMAX ≈ 9.4 V/V); K = 0.940 accounts for internal scaling |
| High-output-current CFA stage | ±60 mA sourcing/sinking into 50–100 Ω loads - replaces discrete driver stages in video line drivers and broadband test equipment |
| Low-noise, wideband input stage | 4.4 nV/√Hz input voltage noise + 2.6 pA/√Hz input current noise - maintains SNR in cascaded receiver front-ends |
| Single-supply operability | GND pin (4) serves as virtual reference; enables 0–2 V VG swing and input biasing from 3.3 V or 5 V rails without level shifters |
Applications
| Wireless IF Receiver AGC | Video Signal Level Control |
|---|---|
|
Use Scenario: Maintaining constant IF signal amplitude across varying RF input power in SDR or cellular baseband receivers. IC Role / Device Role / Timing Role: VGA core in closed-loop AGC path; gain adjusted dynamically by DAC-driven VG to compensate for fading or interference. Use Value: 100 MHz gain control BW enables sub-microsecond response to amplitude transients; 80 dB range accommodates >100 dB input dynamic range. |
Use Scenario: Real-time brightness/contrast adjustment in broadcast-quality video processing pipelines. IC Role / Device Role / Timing Role: DC-coupled gain stage between CCD sensor interface and ADC; VG controlled by microcontroller PWM filtered to analog voltage. Use Value: ±2.4 V output swing into 75 Ω matches video line standards; THD = −45 dBc at 20 MHz ensures minimal color distortion. |
| Voltage-Controlled Filter Tuning | Test Equipment Signal Conditioning |
|
Use Scenario: Adjusting filter passband gain in reconfigurable analog front-ends for spectrum analyzers or vector signal analyzers. IC Role / Device Role / Timing Role: Programmable gain element in active filter feedback path; VG sweeps linearly to tune filter Q and insertion loss. Use Value: Linear-in-dB response ensures predictable filter shape variation; 150 MHz bandwidth supports tuning up to 50 MHz cutoff frequencies. |
Use Scenario: Calibratable signal amplification in automated test equipment (ATE) channel modules requiring traceable gain steps. IC Role / Device Role / Timing Role: Precision gain block with known, repeatable gain accuracy (±0.50 dB at AVMAX) and low offset drift (±55 mV over VG range). Use Value: Gain matching tolerance enables multi-channel synchronization; low 4.4 nV/√Hz noise supports high-resolution measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6503MMX | Linear-in-V/V gain control (not linear-in-dB); 120 MHz −3 dB BW; 60 dB gain range; lower supply current (8.5 mA) | Better suited for digitally controlled linear gain steps (e.g., FPGA-based gain tables); less ideal for analog AGC loops requiring logarithmic response | Select LMH6503MMX when gain must be set via digital word rather than analog voltage, or when lower power dominates over AGC linearity. |
| AD8367ARUZ | 500 MHz −3 dB BW; 45 dB gain range; requires external VPOS bias; higher supply current (22 mA); integrated RMS detector | Targeted at RF/IF AGC above 100 MHz (e.g., microwave receivers); includes on-chip detector for closed-loop control | Select AD8367ARUZ when operating above 150 MHz or when integrated detection simplifies system architecture despite higher power and cost. |
Compared with LMH6505MMX, LMH6503MMX trades logarithmic control linearity for lower power and digital-friendly gain stepping, while AD8367ARUZ extends bandwidth and adds detection at the cost of higher current and reduced attenuation depth - making LMH6505MMX optimal for mid-band AGC where dB-linear precision and 80 dB range are critical.
Availability
LMH6505MMX is available at Aetrix Electronics and suitable for wireless infrastructure IF stages, broadcast video signal conditioning, voltage-controlled filter tuning, and automated test equipment requiring stable component supply and guaranteed long-term availability.
Supply support for LMH6505MMX 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 and embedded processing technologies, with decades of expertise in high-speed amplifiers and signal chain solutions.
The LMH6505MMX belongs to TI's LMH high-speed amplifier product line, designed specifically for wideband, low-distortion, gain-controllable signal conditioning in communications, test & measurement, and imaging systems.
FAQ
What is the maximum recommended supply voltage for LMH6505MMX?
The absolute maximum supply voltage (V+ − V−) for LMH6505MMX is 12.6 V, but the recommended operating range is 7 V to 12 V total. At ±5 V (10 V total), it delivers specified performance including 150 MHz bandwidth and ±60 mA output drive. Exceeding ±6 V risks violating absolute maximum ratings and may degrade reliability or cause latch-up.
How does LMH6505MMX achieve linear-in-dB gain control?
LMH6505MMX achieves linear-in-dB gain control through an internal hyperbolic tangent multiplier architecture. With VG applied to pin 1 (0–2 V), gain varies as A(V/V) = K·RF/RG·tanh[(N − VG)/VC], yielding a near-straight-line response in dB over 80 dB. This eliminates external log conversion and enables direct integration into analog AGC loops without digital intervention.
Can LMH6505MMX operate from a single 5 V supply?
Yes - LMH6505MMX supports single-supply operation. Pin 4 (GND) must be biased to a stable virtual ground (e.g., 2.5 V using resistor divider + bypass cap), VG referenced to that node (0–2 V), and VIN biased within ±0.74 V of that reference. The output will center at the same virtual ground, preserving DC coupling capability without level-shifting circuitry.
What is the role of RG and RF in setting LMH6505MMX gain?
RG (pin 3) sets the transconductance input stage gain and defines input voltage range (±0.74 V max at RG = 100 Ω); RF (external to pin 6) sets the CFA output transimpedance and directly determines bandwidth (BW ∝ 1/RF). Maximum gain is AVMAX = K·RF/RG (K = 0.940 typ), and gain reduction is controlled solely by VG - decoupling signal path design from control path.
Is LMH6505MMX pin-compatible with other devices in the LMH65xx family?
No - LMH6505MMX uses an 8-pin VSSOP (DGK) package with unique pinout (e.g., pin 8 = X1, not NC). LMH6503MMX shares the same package but differs in internal architecture and pin function (e.g., pin 8 = NC). Substituting without schematic and layout review risks misbiasing, oscillation, or failure to achieve specified gain control behavior.
LMH6505MMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 600 nA
- 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-VSSOP
LMH6505MMX FAQ
1.How can I place an order for LMH6505MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6505MMX 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 LMH6505MMX reliable?
The price and inventory of LMH6505MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6505MMX is usually 5 days.
3.What payment methods are accepted for LMH6505MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6505MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6505MMX?
LMH6505MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6505MMX 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 LMH6505MMX?
For technical support, including LMH6505MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6505MMX requirements.
6.How does Aetrix verify that LMH6505MMX is sourced from the original manufacturer or authorized distributors?
All LMH6505MMX 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 LMH6505MMX meets industry standards.
7.What is the process for return or replacement of LMH6505MMX?
All LMH6505MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6505MMX, 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 LMH6505MMX part is unused and in its original packaging.
Return procedure for LMH6505MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH6505MMX Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
