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Texas Instruments THS3111CDGNR
- Part No.:
- THS3111CDGNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS3111CDGNR.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
THS3111CDGNR from Texas Instruments is a low-noise, high-voltage current-feedback operational amplifier optimized for video distribution and high-speed analog signal amplification. 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 <0.013% differential gain error with PAL/NTSC video loads.
For engineers reviewing the THS3111CDGNR datasheet, THS3111CDGNR pinout, THS3111CDGNR application, or THS3111CDGNR equivalent, this page provides verified specifications, MSOP-8 package details, video-amplifier-specific performance data, thermal design guidance, and validated alternative options for broadcast, test equipment, and industrial imaging systems.
Technical Context
The THS3111CDGNR uses a current-feedback architecture enabling wide bandwidth independent of closed-loop gain-critical for maintaining flat frequency response across multiple video loads. Its transimpedance gain stage and low-impedance output buffer support stable driving of 75-Ω transmission lines and up to eight 150-Ω video loads simultaneously without gain or phase degradation.
Unlike voltage-feedback op-amps, its bandwidth scales with feedback resistor value (e.g., 90 MHz at RF = 1 kΩ, G = 2), and its 3-nV/√Hz input voltage noise + 2-pA/√Hz noninverting current noise preserve SNR in high-gain video chains. The device lacks power-down functionality-distinguishing it from the THS3110 variant-and is rated for 0°C to +70°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW | 90 MHz at G = 2, RL = 100 Ω - enables full HD video bandwidth (up to ~40 MHz) with margin for filter roll-off and PCB trace loss. |
| Slew rate | 1300 V/μs - supports 8-VPP output swings at >10 MHz without slewing distortion in composite video or RGB applications. |
| Differential gain | 0.013% (PAL), 0.011% (NTSC) - meets broadcast-grade video fidelity requirements per ITU-R BT.601. |
| Output current | ±260 mA - drives multiple 75-Ω coaxial cables or capacitive loads up to 100 pF without external buffering. |
| Supply range | ±5 V to ±15 V - compatible with legacy ±12 V and modern ±15 V analog video subsystems. |
| Input noise | 3 nV/√Hz voltage noise + 2 pA/√Hz noninverting current noise - minimizes added noise in low-level video signal paths. |
| Operating temp | 0°C to +70°C - qualified for commercial video infrastructure including monitors, switchers, and capture cards. |
Pinout & Package
The THS3111CDGNR is housed in an 8-pin MSOP (DGN) package with PowerPAD™ thermal enhancement. The exposed thermal pad must be soldered to a PCB copper plane for reliable operation at full output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage input | Internal bias reference node; connected to VS− for standard operation; not used in most video configurations. |
| 2 (VIN−) | Inverting input | Current-summing node for feedback network; requires matched impedance to VIN+ for optimal CMRR. |
| 3 (VIN+) | Noninverting input | High-impedance (41 MΩ) input for signal source connection; low capacitance (0.4 pF) preserves HF response. |
| 4 (VS−) | Negative supply rail | Connect to system ground or negative supply; decoupling capacitor required within 1 cm for stability. |
| 5 (VS+) | Positive supply rail | Connect to +15 V (or +5 V); PSRR ≥69 dB ensures immunity to supply ripple in mixed-signal environments. |
| 6 (VOUT) | Amplified output | Low-impedance (0.15 Ω) driver capable of sourcing/sinking 260 mA into 25-Ω loads; 75-Ω line termination recommended. |
| 7 (NC) | No internal connection | Not bonded; leave unconnected or tie to ground only if required by PCB layout for symmetry. |
| 8 (NC) | No internal connection | Not bonded; no electrical function; avoid routing signals beneath this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables constant 90-MHz bandwidth across gains 1–10 via RF selection-eliminates gain-bandwidth trade-off in video gain stages. |
| 75-Ω video line drive | Optimized output stage delivers <0.033° differential phase and <0.013% differential gain into 150-Ω loads-meets SMPTE 253M broadcast specs. |
| PowerPAD™ thermal package | MSOP-8 with exposed die paddle reduces θJA to 58.4°C/W-enables 685 mW continuous dissipation at +85°C ambient without heatsink. |
| Low distortion at 10 MHz | –48 dBc 2nd harmonic and –68 dBc 3rd harmonic (RL = 100 Ω) ensure clean chroma/luma separation in SD/HD video signals. |
| Wide supply flexibility | Operates from ±5 V to ±15 V-supports both low-power portable video gear and high-dynamic-range studio equipment on shared rails. |
Applications
| Video Distribution Amplifier | Broadcast Signal Routing |
|---|---|
|
Use Scenario: Distributing a single composite or component video source to eight monitors in a security control room. IC Role / Device Role / Timing Role: Current-feedback video buffer amplifying and isolating the source while driving multiple 75-Ω coaxial cables. Use Value: Maintains <0.013% differential gain and <0.033° differential phase across all eight outputs-prevents color shift and timing skew between displays. |
Use Scenario: Feeding RGBHV signals from a graphics card to multiple projectors in a live-event staging system. IC Role / Device Role / Timing Role: High-slew-rate line driver preserving edge integrity and minimizing group delay variation across 1080p/60 signals. Use Value: 1300 V/μs slew rate ensures <1 ns rise/fall time fidelity, preventing pixel smearing during fast screen transitions. |
| Test Equipment Signal Conditioning | Industrial Imaging Interface |
|
Use Scenario: Amplifying low-level analog outputs from oscilloscope front-ends before digitization. IC Role / Device Role / Timing Role: Low-noise (3 nV/√Hz), high-output-current amplifier conditioning signals for 12-bit ADC sampling. Use Value: 260 mA drive capability eliminates need for external buffers when driving ADC input networks with 50-Ω termination. |
Use Scenario: Driving analog camera sensor outputs (e.g., CCD/CMOS) over long cables in factory automation vision systems. IC Role / Device Role / Timing Role: Robust video driver compensating for cable capacitance up to 100 pF while maintaining DC-coupled black level. Use Value: Stable operation with RISO compensation (e.g., 39.2 Ω for 47-pF load) prevents peaking and overshoot in 10-m cable runs. |
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 |
|---|---|---|---|
| THS3201DGNR | Higher 400-MHz bandwidth but lower 120 mA output drive; no PowerPAD; 0.025% differential gain (worse than THS3111CDGNR). | Better for RF/IF signal chains; less suitable for multi-load video distribution due to reduced drive and degraded video linearity. | Select THS3201DGNR only when >200-MHz small-signal BW is mandatory and load count ≤2. |
| LMH6702MA/NOPB | 1.7-GHz bandwidth, 120 mA drive, ±6-V max supply; 0.015% differential gain; SOIC-8 only (no MSOP). | Targeted at high-frequency instrumentation; lacks thermal performance for sustained 260-mA loads; larger footprint increases parasitic inductance. | Choose LMH6702MA/NOPB for GHz-range small-signal amplification-not for 75-Ω video distribution requiring high current and low distortion. |
Compared with THS3201DGNR and LMH6702MA/NOPB, the THS3111CDGNR uniquely balances 90-MHz bandwidth, 260-mA drive, 0.013% differential gain, and MSOP-8 PowerPAD thermal efficiency-making it the only option qualified for multi-drop 75-Ω video systems operating continuously at ±15 V.
Availability
THS3111CDGNR is available at Aetrix Electronics and suitable for video distribution amplifiers, broadcast signal routers, test equipment signal conditioners, and industrial imaging interfaces requiring stable component supply across commercial temperature ranges.
Supply support for THS3111CDGNR 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 precision signal chain solutions.
The THS3111 forms part of TI's high-voltage current-feedback op-amp product line, engineered specifically for demanding video, imaging, and high-fidelity analog signal distribution applications where bandwidth, drive strength, and video fidelity are critical.
FAQ
What is the maximum number of 75-Ω video loads the THS3111CDGNR can drive while maintaining broadcast video specifications?
The THS3111CDGNR maintains differential gain error <0.013% and differential phase error <0.033° when driving up to eight 150-Ω loads-equivalent to four 75-Ω video lines with proper termination. This is confirmed by Figure 29 and Figure 30 in the SLOS422E datasheet under ±15 V operation with G = 2 and RF = 1 kΩ. Exceeding eight loads degrades linearity beyond SMPTE 253M compliance.
Does the THS3111CDGNR support single-supply operation, and what are the limitations?
Yes, the THS3111CDGNR operates from a single supply of 10 V to 30 V (e.g., +12 V with ground), but input common-mode range is limited to ±2.8 V at ±5 V supply and ±12.5 V at ±15 V supply. For single-supply video use, DC-coupled inputs require level-shifting circuitry, and output swing is reduced to ±3.5 V (RL = 100 Ω) at +10 V total supply-making ±15 V dual supply preferred for full video signal headroom.
How does the THS3111CDGNR differ from the THS3110CDGNR in functionality and pin compatibility?
The THS3111CDGNR omits the power-down (PD) pin and REF pin control logic present in the THS3110CDGNR. Pin 1 on THS3111CDGNR is REF (not PD), and pins 7–8 are NC-not repurposed. Both share identical pinout, MSOP-8 package, and electrical specs except quiescent current (4.8 mA vs. 270 μA in shutdown). THS3111CDGNR is not pin-compatible with THS3110CDGNR for power-down designs.
What thermal design considerations apply to the THS3111CDGNR's PowerPAD™ package?
The THS3111CDGNR's exposed thermal pad must be soldered to a minimum 300 mm² copper pour using ≥4 thermal vias (0.3-mm diameter) to an internal ground plane. Per the Dissipation Ratings Table, this achieves θJA = 58.4°C/W, allowing 685 mW continuous power at +85°C ambient. Without proper thermal connection, junction temperature exceeds +125°C at full 260-mA output, risking parametric drift or failure.
Can the THS3111CDGNR drive capacitive loads directly, and what isolation resistor (RISO) is recommended?
Yes-the THS3111CDGNR can drive capacitive loads up to 100 pF with appropriate RISO compensation. Figure 8 in the datasheet specifies RISO = 39.2 Ω for CL = 47 pF, 28 Ω for CL = 100 pF, and 54.9 Ω for CL = 10–22 pF. These values are placed in series with the output to isolate the amplifier from cable capacitance, preventing peaking and ensuring stable step response per Figure 27.
THS3111CDGNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-HVSSOP
THS3111CDGNR FAQ
1.How can I place an order for THS3111CDGNR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3111CDGNR 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 THS3111CDGNR reliable?
The price and inventory of THS3111CDGNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3111CDGNR is usually 5 days.
3.What payment methods are accepted for THS3111CDGNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3111CDGNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3111CDGNR?
THS3111CDGNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3111CDGNR 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 THS3111CDGNR?
For technical support, including THS3111CDGNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3111CDGNR requirements.
6.How does Aetrix verify that THS3111CDGNR is sourced from the original manufacturer or authorized distributors?
All THS3111CDGNR 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 THS3111CDGNR meets industry standards.
7.What is the process for return or replacement of THS3111CDGNR?
All THS3111CDGNR units undergo pre-shipment inspection (PSI). If there is an issue with THS3111CDGNR, 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 THS3111CDGNR part is unused and in its original packaging.
Return procedure for THS3111CDGNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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