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Texas Instruments THS3112CDDA
- Part No.:
- THS3112CDDA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3112CDDA.pdf
- Description:
- IC OPAMP CFA 2 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,812
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Product details
Overview
THS3112CDDA from Texas Instruments is a dual-channel, low-noise, high-speed current-feedback amplifier in SOIC PowerPAD™ (DDA) package. It delivers 150 mA min output current, 110-MHz –3-dB bandwidth at ±15 V, 2.2-nV/√Hz voltage noise, and 25-VPP swing into 100 Ω - enabling high-fidelity video distribution and piezo actuator drive.
For engineers reviewing the THS3112CDDA datasheet, THS3112CDDA pinout, THS3112CDDA application, or THS3112CDDA equivalent, key selection criteria include its current-feedback architecture, ±5 V to ±15 V dual-supply operation, thermal performance enabled by PowerPAD™, and suitability for wideband analog signal paths requiring low distortion and fast settling.
Technical Context
The THS3112CDDA uses a current-feedback topology with transimpedance gain stage, enabling bandwidth independence from closed-loop gain-unlike voltage-feedback op-amps. Its noninverting input presents 1.5 MΩ resistance and 2 pF capacitance, while the inverting input exhibits 15 Ω resistance, critical for RF network stability.
Stability relies on precise feedback resistor selection (e.g., 750 Ω for G = 2), as bandwidth and peaking are directly governed by RF value. The device lacks shutdown functionality (distinguishing it from THS3115), operates only in active mode, and requires thermally anchored PowerPAD™ for junction temperature control under 175 mA load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 110 MHz at ±15 V, G = 1 - supports >100 MHz analog signal chains without gain-dependent roll-off |
| Slew Rate | 1550 V/µs at G = 2, ±15 V - enables sub-ns edge fidelity for pulse and video signals | Output Current | 150 mA (min) into 25 Ω - drives heavy capacitive loads and low-Z transmission lines directly |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in precision wideband amplification stages |
| 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 supply - accommodates legacy industrial and broadcast power rails |
| THD | –78 dBc at 1 MHz, 2 VPP, 100 Ω - meets broadcast-grade video distortion requirements |
Pinout & Package
The THS3112CDDA is housed in an 8-pin SOIC PowerPAD™ (DDA) package with exposed thermal pad on underside, requiring solder connection to PCB ground plane for thermal management per TI Technical Brief SLMA002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Inverting output of Channel 1 - low-impedance current source/sink node |
| 2 | OUT2 | Inverting output of Channel 2 - independent output path, no internal crosstalk mitigation |
| 3 | IN1– | Inverting input of Channel 1 - 15 Ω input resistance, dictates RF network design |
| 4 | IN2– | Inverting input of Channel 2 - matched to IN1– for dual-channel symmetry |
| 5 | IN2+ | Noninverting input of Channel 2 - 1.5 MΩ || 2 pF, high-Z reference point |
| 6 | IN1+ | Noninverting input of Channel 1 - identical to IN2+, supports differential input configurations |
| 7 | VCC– | Negative supply rail - must be decoupled locally with 0.1 µF ceramic + bulk capacitor |
| 8 | VCC+ | Positive supply rail - shared across both channels; PowerPAD™ ties to this potential for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low voltage noise | 2.2 nV/√Hz enables high-resolution signal conditioning in front-end amplifiers without degrading system SNR |
| High output current | 150 mA minimum allows direct driving of 50 Ω/75 Ω coaxial cables and piezoelectric transducers without external buffers |
| Current-feedback architecture | Bandwidth remains stable across gains (e.g., 110 MHz at G = 1 and G = 2), simplifying wideband gain-setting design |
| PowerPAD™ thermal package | 67°C/W θJA enables 1.87 W power dissipation at +25°C ambient - critical for sustained high-current operation |
| Wide supply range | Operates from ±5 V to ±15 V, supporting both low-power instrumentation and high-swing broadcast systems |
Applications
| Video Distribution Amplifier | Piezo Actuator Driver |
|---|---|
Use Scenario: Distributing RGB or component video signals to multiple monitors or recording devices over 75 Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel unity-gain buffer with 0.01% differential gain/phase error and 100-MHz flatness. Use Value: Maintains broadcast-grade signal integrity with <0.011° phase error and –78 dBc THD at 1 MHz, eliminating visible artifacts in HD video. | Use Scenario: Driving high-capacitance piezoelectric positioners in semiconductor metrology stages. IC Role / Device Role / Timing Role: High-slew-rate voltage source delivering 150 mA into >10 nF capacitive loads with sub-100 ns settling. Use Value: Achieves 1550 V/µs slew rate and 25-VPP swing into 100 Ω, enabling nanosecond-scale step response for closed-loop motion control. |
| Motor Phase Current Sense | High-Speed Pulse Amplifier |
Use Scenario: Amplifying low-level shunt voltage signals in three-phase BLDC motor controllers with >100 kHz PWM switching. IC Role / Device Role / Timing Role: Dual-channel current-sense amplifier with 110-MHz bandwidth and 63 ns 0.1% settling time. Use Value: Resolves fast current transients without phase lag, supporting field-oriented control (FOC) algorithms at >20 kHz modulation frequencies. | Use Scenario: Boosting TTL/CMOS logic pulses to ±12 V levels for laser diode or RF switch drivers. IC Role / Device Role / Timing Role: Wideband pulse amplifier with 1550 V/µs slew rate and 2.2-nV/√Hz noise floor. Use Value: Delivers clean, fast-rising edges (<5 ns rise time) with minimal overshoot, critical for timing-critical pulsed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3112CD | Same die, SOIC-8 (D) package without PowerPAD™ - higher θJA (95°C/W), lower max power dissipation (1.32 W) | Limited to lower continuous output current or forced-air cooling; unsuitable for sustained 150 mA loads | Select THS3112CD only when thermal budget permits and PCB layout cannot accommodate PowerPAD™ soldering |
| THS3122CDDA | Successor with 150-MHz bandwidth, 2000 V/µs slew rate, and improved 1.8-nV/√Hz noise - same DDA package pinout | Enables next-generation designs requiring >120 MHz signal bandwidth or lower noise floors | THS3122CDDA offers drop-in replacement capability with enhanced specs; verify stability with existing RF networks |
Compared with THS3112CD, THS3112CDDA provides 30% lower thermal resistance and 42% higher power handling; versus THS3122CDDA, it trades 40 MHz bandwidth and 450 V/µs slew for proven production maturity and cost stability in volume deployments.
Availability
THS3112CDDA is available at Aetrix Electronics and suitable for video distribution systems, piezo actuator drivers, and high-speed pulse amplification requiring stable component supply across industrial and broadcast equipment lifecycles.
Supply support for THS3112CDDA 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 THS3112 product line targets wideband analog signal conditioning in demanding applications including broadcast video, test equipment, and precision motion control - emphasizing speed, linearity, and thermal robustness.
FAQ
What is the maximum safe operating junction temperature for THS3112CDDA?
The absolute maximum junction temperature for THS3112CDDA is +150°C. To maintain reliability, design must ensure junction temperature stays below this limit using the DDA package's 67°C/W θJA rating, proper PowerPAD™ soldering to thermal planes, and adequate PCB copper area. At 150 mA output into 25 Ω with ±15 V supplies, THS3112CDDA dissipates ~1.2 W - requiring ≥4 cm² of 2-oz copper for passive cooling.
Does THS3112CDDA support single-supply operation?
Yes, THS3112CDDA supports single-supply operation from 10 V to 30 V, as specified in the Recommended Operating Conditions table. Input and output must be biased at mid-supply (e.g., VCC/2) using resistive dividers and coupling capacitors to preserve dynamic range. The input common-mode range extends to ±12.7 V at ±15 V supply, enabling rail-to-rail input swing when referenced appropriately.
How does the THS3112CDDA differ from THS3115CDDA?
THS3112CDDA lacks the SHUTDOWN and REF pins present on THS3115CDDA and has no low-power disable mode. THS3112CDDA draws 4.9–6.5 mA per channel continuously, while THS3115CDDA reduces to 0.3–0.45 mA in shutdown. Both share identical AC performance, noise, and pinout for the 8-pin DDA variant - but THS3115CDDA is only offered in PWP (TSSOP PowerPAD™), not DDA.
What feedback resistor value is recommended for G = 2 configuration with THS3112CDDA?
For a noninverting gain of 2, the datasheet recommends RF = 750 Ω and RG = 750 Ω (where RG connects IN– to ground). This combination delivers optimal bandwidth (110 MHz) with minimal peaking in the frequency response. Deviating from 750 Ω increases peaking or reduces bandwidth - e.g., RF = 1 kΩ drops bandwidth to ~95 MHz at ±15 V, while RF = 560 Ω increases peaking beyond acceptable limits.
Is THS3112CDDA suitable for driving 50 Ω transmission lines directly?
Yes, THS3112CDDA is explicitly characterized for 50 Ω and 75 Ω loads, delivering 25-VPP into 100 Ω and sustaining 150 mA into 25 Ω. For 50 Ω lines, use G = 2 configuration with 750 Ω feedback and match source impedance via series resistor at output (e.g., 25 Ω) to prevent reflections. The device's 14 Ω open-loop output resistance and high current capability ensure stable termination without external buffers.
THS3112CDDA 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
THS3112CDDA FAQ
1.How can I place an order for THS3112CDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3112CDDA 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 THS3112CDDA reliable?
The price and inventory of THS3112CDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3112CDDA is usually 5 days.
3.What payment methods are accepted for THS3112CDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3112CDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3112CDDA?
THS3112CDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3112CDDA 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 THS3112CDDA?
For technical support, including THS3112CDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3112CDDA requirements.
6.How does Aetrix verify that THS3112CDDA is sourced from the original manufacturer or authorized distributors?
All THS3112CDDA 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 THS3112CDDA meets industry standards.
7.What is the process for return or replacement of THS3112CDDA?
All THS3112CDDA units undergo pre-shipment inspection (PSI). If there is an issue with THS3112CDDA, 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 THS3112CDDA part is unused and in its original packaging.
Return procedure for THS3112CDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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