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Texas Instruments LMH6629 MDC
- Part No.:
- LMH6629 MDC
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
LMH6629 MDC.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT DIESALE
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
LMH6629 MDC from Texas Instruments is an ultra-low-noise, high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning in precision analog front-ends. It delivers 0.69 nV/√Hz input voltage noise, 900 MHz −3dB bandwidth (WSON-8, AV = 10), 1600 V/μs slew rate, and ±250 mA output drive - enabling use in ultrasound pre-amplifiers, transimpedance amplifiers, and base-station receiver chains.
For engineers reviewing the LMH6629 MDC datasheet, LMH6629 MDC pinout, LMH6629 MDC application, or LMH6629 MDC equivalent, key selection criteria include its selectable minimum gain (≥4 or ≥10 V/V via COMP pin), 75 ns enable time, shutdown capability (PD pin), and dual-package availability (WSON-8 and SOT-23-5) with distinct compensation schemes.
Technical Context
The LMH6629 MDC employs a proprietary SiGe process to achieve simultaneous high speed and ultra-low noise. Its internal compensation architecture allows user-selectable stability for minimum gains of 4 V/V (COMP = LO) or 10 V/V (COMP = HI) - eliminating external compensation capacitors required by competing amplifiers.
It supports single-supply operation from 2.7 V to 5.5 V, features rail-to-rail output swing within 0.8 V of rails, and maintains >70 dB CMRR across −0.3 V to 3.8 V input common-mode range - making it suitable for DC-coupled, high-dynamic-range systems where both AC fidelity and DC accuracy are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 900 MHz at AV = 10, VS = 5 V, WSON-8 package - enables RF IF amplification up to UHF bands without gain peaking. |
| Input Voltage Noise | 0.69 nV/√Hz - sets fundamental SNR floor for low-level sensor signals like photodiode or piezoelectric transducer outputs. |
| Slew Rate | 1600 V/μs - supports clean 2 VPP step response with <0.95 ns rise time, critical for pulse-based medical imaging. |
| Output Current | ±250 mA - drives heavy loads (e.g., 100 Ω terminated lines, active filters with low-impedance feedback) without clipping or thermal foldback. |
| Supply Range | 2.7 V to 5.5 V - compatible with modern low-voltage SoC interfaces and battery-powered portable instrumentation. |
| Enable Time | 75 ns - allows rapid power cycling in time-gated applications such as pulsed ultrasound transmit/receive switching. |
| HD2 / HD3 | −90 dBc / −94 dBc at 1 MHz, 2 VPP - ensures minimal harmonic contamination in wideband communication and spectral analysis systems. |
Pinout & Package
LMH6629 MDC is available in two packages: 5-pin SOT-23 (2.90 mm × 1.60 mm) and 8-pin WSON (3.00 mm × 3.00 mm). The WSON-8 variant includes dedicated COMP and PD pins for gain selection and shutdown; the SOT-23-5 integrates fixed compensation for AV ≥10 and omits PD functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Non-inverting input | High-impedance node (450 kΩ common-mode RIN) accepting DC- or AC-coupled signals with −0.3 V to 3.8 V common-mode range. |
| IN− | Inverting input | Differential input node with 4 pF differential capacitance - requires careful PCB layout to minimize phase margin degradation. |
| OUT | Amplifier output | Capable of sourcing/sinking ±250 mA into 100 Ω loads while maintaining linearity and settling within 42 ns (±0.1%). |
| V+ | Positive supply | Accepts 2.7–5.5 V; decoupling with 0.1 μF ceramic capacitor near pin is mandatory for stability at >100 MHz. |
| V− | Negative supply / ground reference | Supports single-supply operation; output swings to within 0.8 V of V−, enabling true ground-referenced signal handling. |
| PD (WSON-8 only) | Power-down control | Active-low digital input; pulls supply current from 15.5 mA to 1.1 mA when asserted - essential for power-constrained portable systems. |
| COMP (WSON-8 only) | Compensation mode select | Logic-high selects AV ≥10 stable operation; logic-low enables AV ≥4 configuration - eliminates need for external compensation networks. |
Key Features
| Feature | Design Value |
|---|---|
| Selectable minimum gain | Configurable AV ≥4 or ≥10 via COMP pin - enables optimal bandwidth-noise trade-off without redesigning feedback network. |
| Ultra-low input voltage noise | 0.69 nV/√Hz at f > 1 MHz - preserves SNR in high-gain, low-signal applications like optical TIA stages. |
| Fast enable/disable | 75 ns enable / 80 ns disable timing - supports burst-mode operation in time-of-flight or gated echo detection systems. |
| Rail-to-rail output swing | 0.72 V to 4.28 V on 5 V supply - maximizes dynamic range in single-supply data acquisition without level-shifting circuitry. |
| High output drive capability | ±250 mA linear output current - directly drives ADC drivers, active filters, or coaxial cable terminations without buffer stages. |
Applications
| Ultrasound Pre-amplifiers | Transimpedance Amplifiers |
|---|---|
Use Scenario: Amplifying weak, high-frequency echoes from piezoelectric transducers in portable ultrasound machines. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with selectable gain and fast settling for time-gated receive windows. Use Value: 0.69 nV/√Hz noise floor and 900 MHz bandwidth preserve axial resolution and contrast-to-noise ratio in B-mode imaging. | Use Scenario: Converting photocurrent from high-speed photodiodes in fiber-optic receivers or LiDAR front-ends. IC Role / Device Role / Timing Role: Transimpedance stage with low input capacitance (1.7 pF common-mode) and high GBW for wide dynamic range. Use Value: 1600 V/μs slew rate handles large transient photocurrents without saturation; HD3 < −94 dBc minimizes intermodulation distortion. |
| Wide-band Active Filters | Base-Station Amplifiers |
Use Scenario: Implementing 2nd- or 4th-order Butterworth/ Chebyshev filters in RF test equipment with cutoff frequencies up to 200 MHz. IC Role / Device Role / Timing Role: High-linearity, low-phase-error gain block in multiple-feedback or state-variable topologies. Use Value: 0.1 dB bandwidth of 330 MHz (AV = 10) ensures flat passband response; peaking < 0.5 dB avoids resonance artifacts. | Use Scenario: Intermediate-frequency (IF) amplification in LTE/5G macrocell and small-cell base station receivers. IC Role / Device Role / Timing Role: Low-noise, high-OIP3 driver for mixer outputs or ADC inputs in zero-IF architectures. Use Value: +31 dBm OIP3 at 25 MHz and −94 dBc HD3 support high-order modulation (256-QAM) with minimal adjacent-channel interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6624MF/NOPB | Fixed AV ≥5, no COMP/PD pins; 1.4 GHz SSBW but higher 1.05 nV/√Hz noise. | Lacks shutdown and gain-selectability - suited for always-on, fixed-gain IF amplifiers. | Choose when maximum bandwidth is prioritized over noise and power control. |
| ADA4898-1ARZ | Lower 0.9 nV/√Hz noise, ±3.3 V supply only; no shutdown, 220 MHz bandwidth. | Optimized for precision DC-coupled instrumentation, not RF/ultrasound pulse response. | Prefer for high-resolution, low-drift sensor signal chains where speed < 250 MHz suffices. |
Compared with LMH6629 MDC, LMH6624MF/NOPB trades lower noise for higher bandwidth and no configurability, while ADA4898-1ARZ offers superior DC precision at significantly reduced speed - making LMH6629 MDC uniquely balanced for wideband, low-noise, power-aware applications.
Availability
LMH6629 MDC is available at Aetrix Electronics and suitable for ultrasound imaging systems, optical transimpedance amplifiers, and 5G base-station IF modules requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for LMH6629 MDC 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-performance op-amps and signal chain solutions.
The LMH6629 MDC belongs to TI's LMH ultra-low-noise, high-speed op-amp family - engineered specifically for demanding wideband applications including medical ultrasound, optical sensing, and wireless infrastructure where noise, speed, and power efficiency must coexist.
FAQ
What is the minimum stable gain of LMH6629 MDC in WSON-8 package?
The LMH6629 MDC in WSON-8 package supports two selectable minimum stable gains: ≥4 V/V when the COMP pin is pulled low, and ≥10 V/V when COMP is high. This eliminates external compensation components and allows flexible bandwidth-noise optimization per design requirements - a feature not available in the SOT-23-5 variant, which is internally compensated for ≥10 V/V only.
Does LMH6629 MDC support true single-supply operation with ground-referenced inputs?
Yes, LMH6629 MDC supports true single-supply operation down to 2.7 V. Its input common-mode range extends to −0.3 V (below ground) and up to 3.8 V on a 5 V supply, and its output swings to within 0.8 V of each rail - enabling direct interfacing with ground-referenced sensors and ADCs without level-shifting circuitry.
What is the typical supply current of LMH6629 MDC in normal and shutdown modes?
At TA = 25°C and VS = 5 V, LMH6629 MDC draws 15.5 mA in normal operation (PD pin high or open). When the PD pin is driven low, supply current drops to 1.1 mA - a 93% reduction that enables aggressive power gating in battery-powered or thermally constrained systems.
Can LMH6629 MDC drive a 100 Ω load while maintaining specified distortion performance?
Yes, LMH6629 MDC is characterized driving 100 Ω loads terminated to mid-supply (e.g., 2.5 V on 5 V). At AV = 10, VO = 2 VPP, and f = 1 MHz, it achieves HD2 = −90 dBc and HD3 = −94 dBc - confirming full-spec linearity under heavy loading, critical for driving ADC inputs or transmission lines without added buffers.
How does the noise performance of LMH6629 MDC compare between 5 V and 3.3 V supply operation?
The input voltage noise of LMH6629 MDC remains constant at 0.69 nV/√Hz regardless of supply voltage (tested at 3.3 V and 5 V). Input current noise is also unchanged at 2.6 pA/√Hz. This supply-independent noise floor ensures consistent SNR across portable (3.3 V) and mains-powered (5 V) system variants.
LMH6629 MDC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1600V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 900 MHz
- Current - Input Bias:
- 15 µA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 15.5mA
- Current - Output / Channel:
- 250 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Diesale
LMH6629 MDC FAQ
1.How can I place an order for LMH6629 MDC through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6629 MDC 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 LMH6629 MDC reliable?
The price and inventory of LMH6629 MDC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6629 MDC is usually 5 days.
3.What payment methods are accepted for LMH6629 MDC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6629 MDC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6629 MDC?
LMH6629 MDC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6629 MDC 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 LMH6629 MDC?
For technical support, including LMH6629 MDC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6629 MDC requirements.
6.How does Aetrix verify that LMH6629 MDC is sourced from the original manufacturer or authorized distributors?
All LMH6629 MDC 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 LMH6629 MDC meets industry standards.
7.What is the process for return or replacement of LMH6629 MDC?
All LMH6629 MDC units undergo pre-shipment inspection (PSI). If there is an issue with LMH6629 MDC, 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 LMH6629 MDC part is unused and in its original packaging.
Return procedure for LMH6629 MDC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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