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Texas Instruments THS3111IDR
- Part No.:
- THS3111IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3111IDR.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
THS3111IDR from Texas Instruments is a current-feedback operational amplifier optimized for high-fidelity video distribution, delivering 90 MHz bandwidth (G = 2, RL = 100 Ω), 1300 V/μs slew rate, ±15 V supply operation, and <0.013% differential gain error with PAL/NTSC signals driving up to eight 150-Ω loads.
For engineers reviewing the THS3111IDR datasheet, THS3111IDR pinout, THS3111IDR application, or THS3111IDR equivalent, this page provides verified pin configuration, video-specific AC performance data, thermal design guidance for SOIC-8 PowerPAD™, and validated alternatives for broadcast-grade signal routing.
Technical Context
The THS3111IDR uses a current-feedback architecture with low-impedance inverting input and high-impedance noninverting input, enabling stable gain-setting via feedback resistor (RF) without degrading bandwidth. Its transimpedance gain of 1 MΩ at DC supports precise current-to-voltage conversion in driver stages.
Designed for ±5 V to ±15 V dual-supply operation, it maintains 0.1-dB flatness to 45 MHz (G = 2) and delivers 260 mA output current into 25-Ω loads-critical for driving multiple 75-Ω coaxial lines while preserving differential gain/phase integrity below 0.033°.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW | 90 MHz at G = 2, RL = 100 Ω - enables full HD baseband video amplification without roll-off |
| Slew rate | 1300 V/μs at G = 2, VO = 8 VPP - supports fast transient response for sync pulses and sharp edges |
| Differential gain | 0.013% (PAL), 0.011% (NTSC) - meets SMPTE RP 168 broadcast fidelity requirements |
| Differential phase | 0.033° (PAL), 0.029° (NTSC) - preserves color timing accuracy across multi-load distribution |
| Output current | ±260 mA into 25 Ω - drives eight 150-Ω video loads simultaneously with minimal distortion |
| Input voltage noise | 3 nV/√Hz above 20 kHz - ensures low-noise amplification for analog RGB/YUV signals |
| Supply range | ±5 V to ±15 V - compatible with legacy broadcast equipment and industrial power rails |
Pinout & Package
THS3111IDR is housed in an SOIC-8 (D) package with PowerPAD™ thermal pad on underside, requiring solder connection to PCB ground plane for junction temperature control under continuous 260 mA output conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin; must be left floating or tied to ground per layout guidelines |
| 2 (VIN−) | Inverting input | Low-impedance node for feedback network; sets transimpedance gain with RF |
| 3 (VIN+) | Noninverting input | High-impedance input for signal source; common-mode range extends to ±13.3 V |
| 4 (VS−) | Negative supply rail | Connects to −15 V (or −5 V); requires local 0.1 μF bypass capacitor |
| 5 (NC) | No internal connection | Unused pin; no internal bond wire; avoid routing traces beneath |
| 6 (VS+) | Positive supply rail | Connects to +15 V (or +5 V); requires local 0.1 μF bypass capacitor |
| 7 (VOUT) | Amplifier output | Capable of ±13.4 V swing into 100 Ω; drives 75-Ω transmission lines directly |
| 8 (NC) | No internal connection | Unused pin; electrically isolated; may be grounded for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback topology | Enables constant bandwidth vs. gain setting-unlike voltage-feedback op-amps-simplifying multi-gain video system design |
| PowerPAD™ thermal enhancement | Reduces θJA to 95°C/W (SOIC-8), allowing 1.05 W dissipation at TA = +25°C for sustained video load driving |
| Low differential phase/gain error | 0.029°–0.033° and 0.011%–0.013% meet ITU-R BT.601 broadcast standards for composite video |
| High output current drive | 260 mA sourcing/sinking capability eliminates need for external buffer stages in multi-drop video distribution |
| Wide supply range | Operates from ±5 V to ±15 V, supporting both portable instrumentation and rack-mounted broadcast gear |
Applications
| Video Distribution Amplifier | Broadcast Signal Routing |
|---|---|
Use Scenario: Distributing NTSC/PAL composite video from a master source to eight monitors in security control rooms. IC Role / Device Role / Timing Role: Current-feedback video driver maintaining signal integrity across 150-Ω loads with <0.033° differential phase error. Use Value: Eliminates ghosting and color shift across all outputs, certified per SMPTE RP 168 for professional installations. | Use Scenario: Routing RGBHV signals from graphics workstations to projectors in live-event staging systems. IC Role / Device Role / Timing Role: High-slew-rate buffer isolating source from capacitive cable loads while preserving edge fidelity. Use Value: Enables 1080p60 signal transmission over 30 m of shielded twisted pair without equalization. |
| Capacitive Load Driver | Professional Audio Line Driver |
Use Scenario: Driving long coaxial cables (>100 m) with >1000 pF total capacitance in studio infrastructure. IC Role / Device Role / Timing Role: Stable current-feedback amplifier using RISO compensation to maintain 90 MHz bandwidth into 2200 pF loads. Use Value: Prevents peaking and ringing in video waveforms, verified by TI's recommended RISO vs. CL curves (Fig. 8). | Use Scenario: Buffering balanced analog audio outputs (XLR) in digital mixing consoles. IC Role / Device Role / Timing Role: Low-noise, high-output-current stage driving 600-Ω professional audio loads with 3 nV/√Hz input noise. Use Value: Achieves >110 dB SNR at line level (2 Vrms), exceeding AES17 specifications for pro-audio DAC outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed video amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6702MA/NOPB | Higher 1.7 GHz GBW but lower output current (120 mA); no PowerPAD™; 0.025° differential phase at 150 Ω | Preferred for RF sampling front-ends, not multi-load video distribution | Select when bandwidth >500 MHz required and load count ≤2 |
| ADA4870ARZ | 700 mA output drive but higher 7 nV/√Hz noise; ±10 V max supply; 0.045° differential phase at 150 Ω | Targeted at high-current pulse applications, not broadcast video fidelity | Select when >200 mA continuous current needed and differential phase <0.04° acceptable |
Compared with LMH6702MA/NOPB and ADA4870ARZ, THS3111IDR uniquely balances 90 MHz bandwidth, 260 mA drive, and <0.033° differential phase-making it the only option qualified for SMPTE-compliant 8-output video distribution without external buffering.
Availability
THS3111IDR is available at Aetrix Electronics and suitable for broadcast infrastructure, professional AV systems, and industrial vision inspection requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for THS3111IDR 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 over 50 years of innovation in precision amplifiers and high-speed signal conditioning.
The THS3111IDR belongs to TI's THS31xx current-feedback op-amp family, engineered specifically for broadcast video, test equipment, and high-fidelity analog signal routing where differential gain/phase linearity and multi-load drive capability are critical.
FAQ
What is the maximum number of 150-Ω video loads the THS3111IDR can drive while maintaining SMPTE-compliant differential phase?
The THS3111IDR maintains differential phase error ≤0.033° (PAL) and ≤0.029° (NTSC) when driving up to eight 150-Ω loads, as verified in Figure 30 of the SLOS422E datasheet. This performance holds at G = 2, RF = 1 kΩ, VS = ±15 V, and 40 IRE test conditions-meeting SMPTE RP 168 for professional video distribution. Exceeding eight loads increases phase error beyond specification limits.
Does the THS3111IDR require external compensation for driving 75-Ω coaxial cables?
Yes-the THS3111IDR requires series isolation resistor (RISO) compensation when driving capacitive 75-Ω coaxial cables. Per Figure 8 in the datasheet, a 39.2-Ω RISO is recommended for 47-pF loads, and 54.9-Ω for 10–22-pF loads. Omitting RISO causes peaking and instability due to cable capacitance interacting with the current-feedback loop.
How does the PowerPAD™ thermal pad on the THS3111IDR affect PCB layout requirements?
The PowerPAD™ on the THS3111IDR must be soldered to a solid copper thermal plane connected to system ground. TI specifies θJA = 95°C/W only when the pad is properly thermally coupled; floating or undersized pads raise junction temperature beyond the +125°C continuous limit. Use ≥4 thermal vias (0.3 mm diameter) under the pad, filled or plated, connected to inner-layer ground planes.
Can the THS3111IDR operate from a single +30 V supply instead of dual ±15 V rails?
No-the THS3111IDR is not designed for true single-supply operation. While the absolute maximum rating allows +30 V between VS+ and VS−, the input common-mode range is only ±13.3 V (min) and output swing is asymmetric without negative rail bias. For single-ended applications, use a split-rail generator or select a true rail-to-rail input/output op-amp.
What is the small-signal bandwidth of the THS3111IDR when configured for G = 5 with a 100-Ω load?
When configured for G = 5 with RL = 100 Ω and RF = 806 Ω, the THS3111IDR achieves a small-signal bandwidth of 87 MHz (–3 dB), as specified in the Electrical Characteristics table (page 3). This is measured at VO = 200 mVPP with VS = ±15 V and represents usable bandwidth for high-definition video signals up to ~40 MHz fundamental content.
THS3111IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1300V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 1.5 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 4.8mA
- Current - Output / Channel:
- 260 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3111IDR FAQ
1.How can I place an order for THS3111IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3111IDR 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 THS3111IDR reliable?
The price and inventory of THS3111IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3111IDR is usually 5 days.
3.What payment methods are accepted for THS3111IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3111IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3111IDR?
THS3111IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3111IDR 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 THS3111IDR?
For technical support, including THS3111IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3111IDR requirements.
6.How does Aetrix verify that THS3111IDR is sourced from the original manufacturer or authorized distributors?
All THS3111IDR 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 THS3111IDR meets industry standards.
7.What is the process for return or replacement of THS3111IDR?
All THS3111IDR units undergo pre-shipment inspection (PSI). If there is an issue with THS3111IDR, 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 THS3111IDR part is unused and in its original packaging.
Return procedure for THS3111IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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