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Texas Instruments THS3111CD
- Part No.:
- THS3111CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3111CD.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
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Product details
Overview
THS3111CD from Texas Instruments is a low-noise, high-voltage, current-feedback operational amplifier optimized for video distribution and high-speed analog signal conditioning. It delivers 90 MHz small-signal bandwidth (G = 2, RL = 100 Ω), 1300 V/μs slew rate, ±15 V supply operation, 260 mA output drive, and differential gain/phase of 0.013% / 0.033° (PAL) into 150 Ω loads - enabling multi-load broadcast-quality video amplification.
For engineers reviewing the THS3111CD datasheet, THS3111CD pinout, THS3111CD application, or THS3111CD equivalent, this page provides verified specifications, SOIC-8 package layout, video-system design context, and validated alternative options - all grounded in TI's SLOS422E datasheet and official ordering information for the commercial-grade THS3111CD variant.
Technical Context
The THS3111CD uses a current-feedback architecture with high-impedance noninverting input (41 MΩ) and low-impedance inverting input, enabling stable wideband gain configurations up to G = 10 without sacrificing phase margin. Its transimpedance gain of 1 MΩ (min) supports precise current-to-voltage conversion in high-speed sensor interfaces.
Unlike voltage-feedback op-amps, its bandwidth remains nearly constant across gain settings - e.g., 90 MHz at G = 2 and 66 MHz at G = 10 - due to feedback resistor (RF)–dependent unity-gain bandwidth. Output stage is fully complementary, delivering symmetrical ±260 mA sourcing/sinking into 25 Ω loads at ±15 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW | 90 MHz at G = 2, RL = 100 Ω - enables full HD video (720p/1080i) baseband amplification without roll-off |
| Slew rate | 1300 V/μs at G = 2, RL = 100 Ω - supports >8 VPP fast transient response for composite sync pulses |
| Output current | ±260 mA min into 25 Ω - drives multiple 75 Ω coaxial lines via series termination or active distribution |
| Differential gain | 0.013% (PAL), 0.011% (NTSC) - meets SMPTE RP 168 broadcast fidelity requirements |
| Input voltage noise | 3 nV/√Hz - preserves SNR in low-level analog front-end stages before ADC sampling |
| Supply range | ±5 V to ±15 V - interoperable with legacy ±12 V and modern ±15 V video processing rails |
| Quiescent current | 4.8 mA max at ±15 V - balances speed and power in always-on video routing paths |
Pinout & Package
THS3111CD is housed in an 8-pin SOIC (D) package with PowerPAD™ thermal enhancement. The exposed thermal pad is electrically isolated and must be soldered to a PCB copper pour for reliable thermal dissipation under continuous 260 mA output loading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin; leave unconnected or tie to ground per layout best practices |
| 2 (VIN−) | Inverting input | Low-impedance node; requires matched trace length and controlled-impedance routing for stability |
| 3 (VIN+) | Noninverting input | High-impedance (41 MΩ); sensitive to stray capacitance - minimize pad size and guard ring |
| 4 (VS−) | Negative supply rail | Return path for output stage; connect directly to ground plane with low-inductance trace |
| 5 (NC) | No internal connection | Unused pin; no electrical function |
| 6 (VOUT) | Amplifier output | Capable of driving ≥75 Ω transmission lines; use series R-C compensation for capacitive loads >100 pF |
| 7 (VS+) | Positive supply rail | Power source for output stage; decouple with 10 μF tantalum + 0.1 μF ceramic near pin |
| 8 (NC) | No internal connection | Unused pin; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback topology | Enables flat bandwidth vs. gain - critical for consistent rise time across video gain stages |
| 75 Ω line drive capability | Validated differential gain/phase performance into 150 Ω loads confirms robustness for dual-75 Ω video fanout |
| Low 3-nV/√Hz voltage noise | Maintains >70 dB SNR in 0–10 MHz video bandwidth, even with 20 dB gain |
| High output current symmetry | ±260 mA sourcing/sinking ensures linear swing on both positive/negative video sync transitions |
| Wide supply tolerance | Operates from ±5 V to ±15 V - simplifies integration into mixed-rail video systems (e.g., ±12 V logic + ±15 V analog) |
Applications
| SD/HD Broadcast Distribution | Professional Video Routing Switchers |
|---|---|
Use Scenario: Amplifying and distributing composite or component video signals from a single source to 4–8 monitors or recorders in broadcast trucks or OB vans. IC Role / Device Role / Timing Role: High-fidelity video distribution amplifier maintaining PAL/NTSC color fidelity across multiple 75 Ω coaxial outputs. Use Value: Differential gain ≤0.013% and phase ≤0.033° ensure no visible hue/saturation shift after fanout - meeting EBU R92 and SMPTE RP 168 compliance. | Use Scenario: Buffering and level-shifting RGB or YPbPr signals between crosspoint switch matrices and output drivers in 4K-capable routing hardware. IC Role / Device Role / Timing Role: High-slew-rate buffer isolating switch matrix outputs from long cable runs and multiple downstream loads. Use Value: 1300 V/μs slew rate preserves 100 ns rise/fall times required for 1.5 Gbps HDMI 1.4 TMDS-equivalent signaling in analog-domain routing. |
| Medical Imaging Signal Conditioning | Test Equipment Video Output Stages |
Use Scenario: Driving analog video outputs from ultrasound or endoscopy processors to display panels or recording devices over 10+ meter cables. IC Role / Device Role / Timing Role: Low-noise, high-output-current driver ensuring diagnostic image clarity without ghosting or edge ringing. Use Value: 3 nV/√Hz input noise and 90 MHz bandwidth preserve fine anatomical detail in real-time B-mode imaging video streams. | Use Scenario: Generating calibrated video test patterns (e.g., multiburst, staircase, color bars) in oscilloscope or waveform monitor calibration equipment. IC Role / Device Role / Timing Role: Precision gain-setting amplifier with flat frequency response for metrology-grade pattern generation. Use Value: 0.1-dB bandwidth flatness of 45 MHz (G = 2) guarantees amplitude accuracy within ±0.1 dB across NTSC/PAL luminance band (0–4.2 MHz). |
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 |
|---|---|---|---|
| THS3201CD | Higher 400 MHz bandwidth but lower 120 mA output drive; no PowerPAD; 5 V single-supply only | Optimized for portable test gear with limited board space and low-voltage rails - not suitable for ±15 V video distribution | Select THS3201CD only when bandwidth >200 MHz is required and load current <120 mA |
| LMH6702MA | 1.7 GHz bandwidth, 120 mA output, ±6 V max supply; higher 5.5 nV/√Hz noise | Better for RF IF amplification or ADC driver roles - insufficient output current and noise for broadcast video fidelity | Choose LMH6702MA for GHz-range signal chains where video distortion specs are secondary |
Compared with THS3111CD, THS3201CD trades output drive and thermal robustness for raw bandwidth and single-supply convenience, while LMH6702MA prioritizes RF bandwidth over video-linearity metrics - making THS3111CD uniquely balanced for multi-load, high-fidelity analog video distribution.
Availability
THS3111CD is available at Aetrix Electronics and suitable for SD/HD broadcast infrastructure, professional video routing systems, medical imaging displays, and precision test equipment requiring stable component supply across extended production lifecycles.
Supply support for THS3111CD 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 digital signal technologies - with deep heritage in high-performance op-amps and video interface solutions.
The THS3111CD belongs to TI's THS31xx current-feedback op-amp family, engineered specifically for broadcast-grade video distribution, high-current analog buffering, and precision high-speed signal conditioning where bandwidth, linearity, and output drive are co-critical.
FAQ
What is the maximum number of 75 Ω video loads the THS3111CD can drive while maintaining SMPTE-compliant differential gain?
The THS3111CD maintains differential gain ≤0.013% (PAL) and ≤0.011% (NTSC) into up to eight 150 Ω loads - equivalent to four parallel 75 Ω coaxial cables with proper termination. This is confirmed by Figure 29 in the SLOS422E datasheet, which shows worst-case differential gain deviation remains below 0.03% across 0–8 loads at ±15 V supply and G = 2. For THS3111CD designs targeting SMPTE RP 168 compliance, four 75 Ω outputs represent a robust, margin-safe configuration.
Does the THS3111CD include a power-down feature like the THS3110?
No, the THS3111CD does not include a power-down (PD) pin or power-down functionality. That feature is exclusive to the THS3110 variant, as clearly differentiated in the "AVAILABLE OPTIONS" table and "POWER-DOWN CHARACTERISTICS" section of the SLOS422E datasheet. The THS3111CD is optimized for always-on video signal paths and draws 4.8 mA quiescent current at ±15 V - a fixed operating point with no enable/disable control.
Can the THS3111CD operate from a single +12 V supply?
Yes, the THS3111CD supports single-supply operation from +10 V to +30 V, per the "RECOMMENDED OPERATING CONDITIONS" table. At +12 V, it delivers 78 MHz small-signal bandwidth (G = 2), 700 V/μs slew rate, and ±3.5 V output swing into 100 Ω - sufficient for many DC-coupled video applications. However, AC-coupled designs using ±15 V remain preferred for maximum dynamic range, especially in broadcast environments where headroom for sync tips and blanking intervals is critical.
What is the recommended feedback resistor value for G = 2 in a noninverting configuration using the THS3111CD?
The THS3111CD datasheet specifies RF = 1 kΩ for G = 2 in noninverting configurations at ±15 V supply, as used in all AC performance test conditions (e.g., bandwidth, slew rate, harmonic distortion). This value optimizes stability, bandwidth flatness (45 MHz 0.1-dB flatness), and distortion performance. Using RF = 1 kΩ with RG = 1 kΩ yields precise G = 2, and the 1 kΩ value also minimizes noise gain peaking observed with higher resistance values in current-feedback topologies.
How does the THS3111CD's PowerPAD™ package affect PCB layout and thermal design?
The THS3111CD's SOIC-8 (D) package incorporates an electrically isolated PowerPAD™ thermal pad on the underside, which must be soldered to a dedicated PCB copper pour for effective heat dissipation. Per TI Technical Brief SLMA002, the pad should be connected to a minimum 1-in² copper area with ≥4 thermal vias (0.3 mm diameter) to an inner ground plane. Without this, junction temperature can exceed +125°C under sustained 260 mA output loading - risking parametric drift or long-term reliability failure. The pad is not connected to any pin and must remain floating electrically.
THS3111CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3111CD FAQ
1.How can I place an order for THS3111CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3111CD 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 THS3111CD reliable?
The price and inventory of THS3111CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3111CD is usually 5 days.
3.What payment methods are accepted for THS3111CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3111CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3111CD?
THS3111CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3111CD 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 THS3111CD?
For technical support, including THS3111CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3111CD requirements.
6.How does Aetrix verify that THS3111CD is sourced from the original manufacturer or authorized distributors?
All THS3111CD 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 THS3111CD meets industry standards.
7.What is the process for return or replacement of THS3111CD?
All THS3111CD units undergo pre-shipment inspection (PSI). If there is an issue with THS3111CD, 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 THS3111CD part is unused and in its original packaging.
Return procedure for THS3111CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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