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Texas Instruments THS3112IDDA
- Part No.:
- THS3112IDDA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3112IDDA.pdf
- Description:
- IC OPAMP CFA 2 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
THS3112IDDA from Texas Instruments is a dual-channel, low-noise, high-speed current-feedback amplifier in SOIC PowerPAD™ (DDA) package. It delivers 150 mA minimum output current, 110-MHz –3-dB bandwidth at ±15-V supply, 1550-V/µs slew rate, and 2.2-nV/√Hz input voltage noise. It serves as a video distribution amplifier driving multiple 75-Ω coaxial lines with minimal group delay.
For engineers reviewing the THS3112IDDA datasheet, THS3112IDDA pinout, THS3112IDDA application, or THS3112IDDA equivalent, key selection criteria include output drive capability into 100-Ω loads, current-feedback stability with 750-Ω feedback resistors, industrial temperature range (–40°C to +85°C), and thermal performance enabled by the PowerPAD™ bottom-side thermal pad.
Technical Context
The THS3112IDDA uses a current-feedback architecture with transimpedance gain stage, enabling wide bandwidth independent of closed-loop gain. Its noninverting input presents 1.5-MΩ resistance and 2-pF capacitance, while the inverting input exhibits 15-Ω resistance - critical for matching RF resistor networks and minimizing peaking.
Stability relies on precise feedback resistor selection: 750 Ω is recommended for G = 2, 560 Ω for G = 4, and 200 Ω for G = 8. The device lacks shutdown functionality (distinguishing it from THS3115), operates from ±5 V to ±15 V dual supplies or 10 V to 30 V single supply, and requires thermal connection of the PowerPAD™ to PCB copper for junction temperature control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 110 MHz at ±15 V, G = 1 - supports HD video baseband signal amplification without attenuation |
| Slew Rate | 1550 V/µs at ±15 V, G = 2 - enables clean reproduction of fast video edges and pulse signals |
| Output Current | ≥175 mA into 25-Ω load - drives multiple 75-Ω video lines simultaneously via impedance-matching networks |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level analog signal paths such as RGB component video |
| Current Noise | 2.9 pA/√Hz (noninverting), 10.8 pA/√Hz (inverting) - minimizes noise contribution in high-Z sensor interfaces |
| Supply Range | ±5 V to ±15 V dual or 10 V to 30 V single - accommodates legacy industrial rails and modern compact supplies |
| Operating Temp | –40°C to +85°C - qualified for industrial motor control and outdoor video equipment |
Pinout & Package
THS3112IDDA is housed in an 8-pin SOIC PowerPAD™ (DDA) package with exposed thermal pad on underside. The PowerPAD™ must be soldered to a thermally conductive PCB plane to maintain junction temperature ≤150°C under full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Inverting output of Channel 1 - directly drives 75-Ω video line or FET gate with 150+ mA peak current |
| 2 | OUT2 | Inverting output of Channel 2 - enables dual-channel video distribution or differential driver configurations |
| 3 | IN1– | Inverting input of Channel 1 - connects to 750-Ω feedback resistor; 15-Ω impedance sets RF network stability |
| 4 | IN2– | Inverting input of Channel 2 - identical impedance and layout rules apply as IN1– |
| 5 | IN2+ | Noninverting input of Channel 2 - 1.5-MΩ input resistance allows DC-coupled biasing in single-supply video amps |
| 6 | IN1+ | Noninverting input of Channel 1 - referenced to mid-supply in single-rail designs; accepts 12.7-V common-mode range at ±15 V |
| 7 | VCC– | Negative supply rail - connects to –5 V to –15 V; internal ESD protection clamps to –4 V differential |
| 8 | VCC+ | Positive supply rail - connects to +5 V to +15 V; power dissipation limited by 67°C/W θJA (DDA package) |
Key Features
| Feature | Design Value |
|---|---|
| Low distortion | –78 dBc THD at 1 MHz, 2 VPP into 100 Ω - meets broadcast-grade video linearity requirements |
| Wide output swing | 25-VPP into 100 Ω at ±15 V - supports full-range analog video signals without clipping |
| Thermal enhancement | 67°C/W junction-to-ambient (θJA) with PowerPAD™ soldered - enables 1.87 W continuous dissipation at +25°C ambient |
| Input common-mode range | ±12.7 V at ±15 V supply - allows direct interface to ±12 V sensor outputs or DACs |
| DC precision | 13-mV max input offset voltage over full temperature range - sufficient for video DC restoration, not precision instrumentation |
Applications
| Video Distribution Amplifier | Piezo Actuator Driver |
|---|---|
Use Scenario: Distributing composite or component video signals to 4–8 monitors or recording devices over 75-Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier configured in unity-gain or G = 2 noninverting mode to preserve signal integrity and minimize group delay. Use Value: 110-MHz bandwidth and 0.01% differential gain/phase error ensure NTSC/PAL color fidelity across all outputs. | Use Scenario: Driving high-capacitance piezoelectric actuators in precision positioning stages or ultrasonic transducers. IC Role / Device Role / Timing Role: High-current voltage buffer delivering >150 mA peak into >10 nF capacitive loads with controlled slew rate. Use Value: 1550-V/µs slew rate and 25-VPP swing enable rapid actuator displacement with sub-microsecond settling. |
| Motor Phase Current Sense | High-Speed ADC Driver |
Use Scenario: Amplifying low-voltage shunt resistor signals (±100 mV) in three-phase inverter leg current sensing. IC Role / Device Role / Timing Role: Dual-channel difference amplifier with matched input offsets, driving isolated sigma-delta modulators. Use Value: 62-dB CMRR at DC and 10.8-pA/√Hz inverting current noise reduce common-mode interference from PWM switching noise. | Use Scenario: Buffering and level-shifting fast analog signals (e.g., IF sampling at 65 MSPS) into SAR or pipeline ADC inputs. IC Role / Device Role / Timing Role: Wideband, low-noise driver with 2.2-nV/√Hz voltage noise and 63-ns 0.1% settling time. Use Value: 110-MHz bandwidth and –78 dBc THD preserve ENOB in 12-bit+ ADC systems operating up to 20 MHz input frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3122IDDA | Higher 190-MHz bandwidth, 2000-V/µs slew rate, 3.5-nV/√Hz voltage noise; same DDA package and pinout | Better suited for >100-MHz IF amplification or ultrafast pulse generation where THS3112IDDA's 110-MHz limit is insufficient | Select THS3122IDDA when bandwidth headroom >25% is required and higher noise floor is acceptable |
| OPA2691IDGKT | 1.8-GHz gain-bandwidth, voltage-feedback topology; 5.5-nV/√Hz noise; MSOP-8 package; no PowerPAD™ | Superior small-signal linearity at high frequencies but lacks THS3112IDDA's output current drive and thermal robustness for sustained 150-mA loads | Choose OPA2691IDGKT for RF/IF gain blocks with <50-Ω loads; avoid for video distribution or piezo drive |
Compared with THS3112IDDA, THS3122IDDA offers higher speed at the cost of increased noise and supply current, while OPA2691IDGKT provides GHz-class bandwidth but cannot sustain 150-mA output current or match the thermal performance of the PowerPAD™ package.
Availability
THS3112IDDA is available at Aetrix Electronics and suitable for video distribution systems, industrial motor control feedback loops, and high-speed data acquisition front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS3112IDDA 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 amplifiers and precision signal chain solutions.
The THS3112IDDA belongs to TI's THS31xx family of current-feedback amplifiers, designed specifically for demanding applications requiring high output current, wide bandwidth, and low distortion - especially video, test equipment, and piezoelectric actuation.
FAQ
What is the maximum safe operating junction temperature for THS3112IDDA?
The absolute maximum junction temperature for THS3112IDDA is +150°C. To achieve this reliably, the SOIC PowerPAD™ (DDA) package must be soldered to a thermally robust PCB plane per TI Technical Brief SLMA002. With θJA = 67°C/W and ambient at +25°C, continuous power dissipation must remain ≤1.87 W. Derating is required above +25°C ambient.
Does THS3112IDDA support single-supply operation?
Yes, THS3112IDDA supports single-supply operation from 10 V to 30 V. Input and output must be biased at mid-supply (e.g., VS/2) using resistive dividers or active references to maximize output voltage swing. The input common-mode range extends to within 2.5 V of each rail at ±5 V supply and ±12.7 V at ±15 V supply, enabling flexible biasing schemes.
Can THS3112IDDA drive a 50-Ω load continuously?
THS3112IDDA can deliver ≥175 mA into a 25-Ω load, making it capable of driving 50-Ω loads with margin. However, sustained 50-Ω operation at full output swing increases power dissipation significantly. Thermal design must ensure junction temperature remains ≤150°C - typically requiring ≥2 in² of 2-oz copper connected to the PowerPAD™ for continuous 50-Ω drive at ±15 V.
How does THS3112IDDA differ from THS3115IDDA?
THS3112IDDA lacks the shutdown pin and REF pin present on THS3115IDDA. It draws 4.9–7.5 mA per channel continuously, while THS3115IDDA reduces quiescent current to 300 µA/channel in shutdown mode. Both share identical bandwidth, noise, and output drive specs, but only THS3115IDDA supports power-gating for battery-operated systems.
What feedback resistor value is recommended for G = 2 noninverting configuration with THS3112IDDA?
For a stable G = 2 noninverting configuration with THS3112IDDA, TI specifies 750 Ω for both RF (feedback) and RG (ground reference) resistors when driving a 100-Ω load. This value minimizes peaking in the frequency response and maintains phase margin >45°. Deviating from 750 Ω requires stability analysis using TI's application curves in SLOS385C.
THS3112IDDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1550V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 110 MHz
- Current - Input Bias:
- 330 nA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 4.9mA (x2 Channels)
- Current - Output / Channel:
- 270 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-SO PowerPad
THS3112IDDA FAQ
1.How can I place an order for THS3112IDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3112IDDA 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 THS3112IDDA reliable?
The price and inventory of THS3112IDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3112IDDA is usually 5 days.
3.What payment methods are accepted for THS3112IDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3112IDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3112IDDA?
THS3112IDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3112IDDA 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 THS3112IDDA?
For technical support, including THS3112IDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3112IDDA requirements.
6.How does Aetrix verify that THS3112IDDA is sourced from the original manufacturer or authorized distributors?
All THS3112IDDA 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 THS3112IDDA meets industry standards.
7.What is the process for return or replacement of THS3112IDDA?
All THS3112IDDA units undergo pre-shipment inspection (PSI). If there is an issue with THS3112IDDA, 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 THS3112IDDA part is unused and in its original packaging.
Return procedure for THS3112IDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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