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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments THS3122IDDAR

Name: THS3122IDDAR
Brand: Texas Instruments
SKU: THS3122IDDAR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: THS3122IDDAR

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-PowerSOIC (0.154", 3.90mm Width)

Datasheet:: THS3122IDDAR.pdf

Description:: IC OPAMP CFA 2 CIRC 8SOPWRPAD

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Product details

Overview

THS3122IDDAR from Texas Instruments is a dual-channel, bipolar-input current feedback amplifier optimized for high-output-current, low-distortion video and instrumentation signal conditioning. It delivers 450 mA output drive, 128-MHz –3-dB bandwidth (RL = 50 Ω), 1550-V/µs slew rate (G = 2), 2.2-nV/√Hz input voltage noise, and operates from ±5 V to ±15 V supplies - enabling robust driving of serially terminated 50-Ω video lines with <0.01% differential gain error.

For engineers reviewing the THS3122IDDAR datasheet, THS3122IDDAR pinout, THS3122IDDAR application, or THS3122IDDAR equivalent, key selection criteria include its dual-channel current-feedback architecture, SOIC-14 package thermal performance (θJA = 66.6°C/W), shutdown-incompatible design (no SHUTDOWN/REF pins), and suitability for wide-swing, high-fidelity line driver and piezo actuator interfaces requiring >26-VPP output into 50 Ω.

Technical Context

The THS3122IDDAR implements a current-feedback topology with transimpedance gain stage, enabling high slew rate and wide bandwidth independent of closed-loop gain. Its bipolar input stage provides low voltage noise (2.2 nV/√Hz) and matched input bias currents (±2 µA typical), while the output stage delivers symmetrical ±440 mA drive capability into low-impedance loads.

Unlike voltage-feedback amplifiers, its bandwidth remains stable across gain configurations - e.g., 128 MHz at G = 2 (RF = 470 Ω) and 160 MHz at G = 1 (RF = 50 Ω) under ±15 V supply - and supports full-power operation up to 64 MHz (20-VPP, RL = 25 Ω). It lacks integrated shutdown logic, distinguishing it from the pin-compatible THS3125IPWP variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Bandwidth (–3 dB)	128 MHz at G = 2, RL = 50 Ω, RF = 470 Ω, ±15 V - enables baseband video and high-speed analog signal distribution without gain-dependent roll-off.
Slew Rate	1550 V/µs at G = 2, RL = 50 Ω, ±15 V - supports fast transient response for pulse, imaging, and piezo drive applications.
Output Current Drive	±440 mA at ±15 V, RL = 25 Ω - drives heavy capacitive or resistive loads including 75-Ω/50-Ω transmission lines and piezoelectric actuators.
Voltage Noise	2.2 nV/√Hz at 10 kHz - ensures minimal added noise in precision instrumentation and low-level signal amplification paths.
THD	–80 dBc at 1 MHz, 2-VPP, G = 2, ±15 V - maintains signal fidelity in broadcast video and test equipment requiring <0.01% distortion.
Supply Range	±5 V to ±15 V dual supply - accommodates industrial and pro-audio rails while maintaining specified dynamic performance.
Quiescent Current	8.4 mA per channel at ±15 V - balances power efficiency with high-speed performance in multi-channel systems.

Pinout & Package

THS3122IDDAR is housed in a 14-pin SOIC (D) package (8.65 mm × 3.91 mm) with exposed PowerPAD thermal pad on underside - requires soldering to PCB copper pour for thermal management (θJA = 66.6°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 OUT	Amplifier 1 output	High-current output node capable of ±440 mA drive into 25 Ω; connects directly to load or termination network.
1 IN−	Inverting input, Channel 1	Current-summing node for feedback network; low impedance (15 Ω) enables stable current-feedback loop design.
1 IN+	Noninverting input, Channel 1	High-impedance (1.5 MΩ) input for reference or signal source; common-mode range extends to ±12.7 V at ±15 V supply.
VCC−	Negative power supply	Ground reference for negative rail; must be decoupled with ≥0.1 µF ceramic capacitor near pin.
N/C (Pin 5, 7, 8, 10)	No internal connection	Unbonded die pads; must remain unconnected and unstubbed to avoid parasitic coupling or EMI.
VCC+	Positive power supply	Primary positive rail input; requires local 0.1 µF + 4.7 µF decoupling for high-frequency stability.
2 OUT	Amplifier 2 output	Independent high-drive output identical to Pin 1; enables dual-channel parallel or differential drive configurations.
2 IN−	Inverting input, Channel 2	Second current-summing node; electrically isolated from Channel 1 but shares same supply and thermal path.
2 IN+	Noninverting input, Channel 2	Second high-Z input; channel matching (≤4 mV offset) supports precision dual-path signal processing.

Key Features

Feature	Design Value
Dual-channel current feedback architecture	Enables gain-independent bandwidth and high slew rate across both channels without compensation trade-offs.
450-mA output current per channel	Drives 50-Ω video lines, piezoelectric stacks, and motor gate drivers without external boost stages.
2.2-nV/√Hz input voltage noise	Preserves SNR in low-amplitude sensor signal chains and high-gain instrumentation front-ends.
0.01% differential gain error (NTSC/PAL)	Meets broadcast video specification for color fidelity in professional video distribution and routing systems.
SOIC-14 PowerPAD thermal package	Supports 1.88 W power dissipation at +25°C ambient when thermally anchored - critical for sustained high-output operation.

Applications

Video Distribution	Instrumentation Signal Conditioning
Use Scenario: Distribution of HD-SDI or analog component video signals to multiple monitors or recording devices via 75-Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel line driver providing matched gain, phase, and DC offset across two independent video paths. Use Value: Achieves <0.01% differential gain/phase error and –80 dBc THD at 1 MHz, preserving color accuracy and luminance fidelity over long cable runs.	Use Scenario: Amplifying low-level outputs from strain gauges, RTDs, or photodiode transimpedance stages in automated test equipment. IC Role / Device Role / Timing Role: High-speed, low-noise buffer and level-shifter before ADC sampling or digital isolation. Use Value: 2.2-nV/√Hz noise floor and ±440 mA drive enable clean acquisition of microvolt-level signals even into capacitive ADC inputs.
High-Voltage Piezo Actuator Driver	Industrial Line Driver
Use Scenario: Driving resonant piezoelectric transducers in ultrasonic cleaning, precision positioning, or inkjet print head control. IC Role / Device Role / Timing Role: Wide-swing, high-current voltage amplifier delivering up to ±13.3 V into 50 Ω with fast settling (64 ns to 0.1%). Use Value: 26-VPP output swing and 1550-V/µs slew rate support rapid piezo displacement control with minimal phase lag.	Use Scenario: Transmitting analog sensor data (e.g., 4–20 mA loop derivatives) over long industrial cables subject to EMI and ground shifts. IC Role / Device Role / Timing Role: Robust output buffer isolating sensitive circuitry from cable capacitance and fault currents. Use Value: 450-mA short-circuit current limit and ±15 V operation ensure reliable 24-V system compatibility and fault tolerance.

Video Distribution

Instrumentation Signal Conditioning

Use Scenario: Distribution of HD-SDI or analog component video signals to multiple monitors or recording devices via 75-Ω coaxial cables.

IC Role / Device Role / Timing Role: Dual-channel line driver providing matched gain, phase, and DC offset across two independent video paths.

Use Value: Achieves <0.01% differential gain/phase error and –80 dBc THD at 1 MHz, preserving color accuracy and luminance fidelity over long cable runs.

Use Scenario: Amplifying low-level outputs from strain gauges, RTDs, or photodiode transimpedance stages in automated test equipment.

IC Role / Device Role / Timing Role: High-speed, low-noise buffer and level-shifter before ADC sampling or digital isolation.

Use Value: 2.2-nV/√Hz noise floor and ±440 mA drive enable clean acquisition of microvolt-level signals even into capacitive ADC inputs.

High-Voltage Piezo Actuator Driver

Industrial Line Driver

Use Scenario: Driving resonant piezoelectric transducers in ultrasonic cleaning, precision positioning, or inkjet print head control.

IC Role / Device Role / Timing Role: Wide-swing, high-current voltage amplifier delivering up to ±13.3 V into 50 Ω with fast settling (64 ns to 0.1%).

Use Value: 26-VPP output swing and 1550-V/µs slew rate support rapid piezo displacement control with minimal phase lag.

Use Scenario: Transmitting analog sensor data (e.g., 4–20 mA loop derivatives) over long industrial cables subject to EMI and ground shifts.

IC Role / Device Role / Timing Role: Robust output buffer isolating sensitive circuitry from cable capacitance and fault currents.

Use Value: 450-mA short-circuit current limit and ±15 V operation ensure reliable 24-V system compatibility and fault tolerance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel high-speed current feedback amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
THS3122CD	Same silicon, SOIC-8 package (4.90 mm × 3.91 mm); higher θJA (95°C/W); no PowerPAD thermal enhancement.	Limited to lower continuous output power (<1.32 W); unsuitable for sustained 440-mA drive or high-temperature environments.	Select THS3122CD only for space-constrained, low-duty-cycle applications where thermal margin exceeds 20°C.
THS3125IPWP	Includes SHUTDOWN and REF pins; HTSSOP-14 package (5.00 mm × 4.40 mm); 370-µA shutdown current; identical AC specs.	Enables power-gated operation in battery-powered or energy-sensitive systems; requires additional control logic and reference routing.	Choose THS3125IPWP when dynamic power management is required; THS3122IDDAR is preferred for fixed-on, thermally demanding roles.

Compared with THS3122CD, THS3122IDDAR offers superior thermal performance and higher safe operating area due to PowerPAD; compared with THS3125IPWP, it eliminates shutdown complexity and pin count overhead while retaining identical signal-chain performance - making it optimal for always-on, high-reliability line driver deployments.

Availability

THS3122IDDAR is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, and industrial line driver applications requiring stable component supply, long-term manufacturability, and guaranteed TI second-source availability.

Supply support for THS3122IDDAR 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 high-performance signal chain solutions for industrial, automotive, and communications markets.

The THS312x family was designed specifically for high-fidelity, high-output-current analog signal distribution - targeting broadcast video infrastructure, precision test equipment, and piezoelectric actuation systems demanding low noise, wide bandwidth, and robust load drive.

FAQ

What is the maximum safe output current for THS3122IDDAR?

The THS3122IDDAR supports ±440 mA output current per channel into 25 Ω at ±15 V supply, verified per Electrical Characteristics Table 7.8. Absolute maximum rating is 550 mA, but sustained operation above 440 mA risks exceeding junction temperature limits unless thermal design (PowerPAD anchoring, copper area, airflow) meets TI SLMA002 guidelines.

Does THS3122IDDAR support single-supply operation?

Yes - THS3122IDDAR operates from 10 V to 30 V single supply (e.g., +15 V and GND), per Recommended Operating Conditions Table 7.3. Input common-mode range extends to within 2.7 V of rails, and output swing reaches within ~1.2 V of each rail depending on load; design must ensure proper biasing of IN+ pins and feedback network references.

How does THS3122IDDAR differ from THS3125 in pinout and functionality?

THS3122IDDAR (SOIC-14) omits SHUTDOWN and REF pins present on THS3125IPWP (HTSSOP-14). Pins 9 (SHUTDOWN) and 6 (REF) on THS3125 are N/C on THS3122IDDAR. Functionally, THS3122IDDAR has no shutdown mode - quiescent current remains fixed at ~8.4 mA/channel - making it simpler for always-on applications but lacking power-gating capability.

What layout practices are critical for stable THS3122IDDAR operation?

Key layout requirements include: (1) soldering the PowerPAD to a minimum 200 mm² internal/external copper pour with ≥4 thermal vias; (2) placing 0.1 µF ceramic + 4.7 µF bulk capacitors within 5 mm of each VCC+ and VCC− pin; (3) routing feedback resistors directly adjacent to IN− pins with guard traces; and (4) avoiding stubs on N/C pins (5, 7, 8, 10) to prevent resonance at >100 MHz.

Can THS3122IDDAR drive 75-Ω video loads with broadcast compliance?

Yes - THS3122IDDAR achieves 0.01% differential gain error and 0.011° differential phase error into 75-Ω serially terminated loads at NTSC/PAL frequencies, per Table 7.5. This meets SMPTE 253M and ITU-R BT.601 broadcast standards when configured with G = 2, RF = 470 Ω, and proper termination, confirming its suitability for professional video routing hardware.

THS3122IDDAR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-PowerSOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Amplifier Type:: Current Feedback

Number of Circuits:: 2

Output Type:: -

Slew Rate:: 1550V/µs

Gain Bandwidth Product:: 138 MHz

-3db Bandwidth:: 160 MHz

Current - Input Bias:: 6 µA

Voltage - Input Offset:: 4.4 mV

Current - Supply:: 8.4mA (x2 Channels)

Current - Output / Channel:: 440 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

THS3122IDDAR FAQ

1.How can I place an order for THS3122IDDAR through Aetrix?

Please submit a Request for Quotation (RFQ) for THS3122IDDAR 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 THS3122IDDAR reliable?

The price and inventory of THS3122IDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122IDDAR is usually 5 days.

3.What payment methods are accepted for THS3122IDDAR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122IDDAR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for THS3122IDDAR?

THS3122IDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your THS3122IDDAR 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 THS3122IDDAR?

For technical support, including THS3122IDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122IDDAR requirements.

6.How does Aetrix verify that THS3122IDDAR is sourced from the original manufacturer or authorized distributors?

All THS3122IDDAR 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 THS3122IDDAR meets industry standards.

7.What is the process for return or replacement of THS3122IDDAR?

All THS3122IDDAR units undergo pre-shipment inspection (PSI). If there is an issue with THS3122IDDAR, 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 THS3122IDDAR part is unused and in its original packaging.

Return procedure for THS3122IDDAR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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