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Texas Instruments THS3122IDDA
- Part No.:
- THS3122IDDA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3122IDDA.pdf
- Description:
- IC OPAMP CFA 2 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
THS3122IDDA from Texas Instruments is a dual-channel, bipolar-input current feedback amplifier in HSOP-8 PowerPAD™ package, delivering 450 mA output drive, 128-MHz –3-dB bandwidth (RL = 50 Ω), 1550-V/µs slew rate (G = 2), and ultra-low 2.2-nV/√Hz voltage noise. It operates from ±5 V to ±15 V supplies and targets high-fidelity video distribution and precision instrumentation requiring low distortion under heavy loads.
For engineers reviewing the THS3122IDDA datasheet, THS3122IDDA pinout, THS3122IDDA application, or THS3122IDDA equivalent, this page provides verified specifications, validated pin functions, confirmed industrial-temperature operation (–40°C to +85°C), and real-world design context for video line driving, piezo actuation, and wide-swing analog signal conditioning.
Technical Context
The THS3122IDDA implements a current feedback architecture with high-impedance noninverting inputs and low-impedance inverting inputs, enabling stable gain-setting with resistive feedback networks independent of closed-loop bandwidth. Its transimpedance gain stage drives a high-current output stage capable of ±230 mA into 50 Ω while maintaining –80 dBc THD at 1 MHz and 2 VPP.
Unlike voltage-feedback amplifiers, its bandwidth remains largely independent of closed-loop gain-e.g., 128 MHz at G = 2 (RF = 470 Ω) and 138 MHz at G = 1 (RF = 50 Ω) under ±15 V supply-making it suitable for fixed-gain, high-speed signal paths where gain stability and pulse fidelity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at G = 2, RL = 50 Ω, RF = 470 Ω - supports full HD video baseband and fast pulse amplification without roll-off |
| Slew Rate | 1550 V/µs at G = 2, RL = 50 Ω - enables clean 10-VPP step response within 6.5 ns, critical for imaging and test equipment |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level sensor signal chains and high-gain preamp stages |
| Output Current | ±450 mA peak - drives four 75-Ω serially terminated video lines or piezoelectric actuators with <0.01% differential gain error |
| Supply Range | ±5 V to ±15 V dual supply - accommodates industrial analog rails and legacy ±12 V systems without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control, motor drive feedback, and outdoor instrumentation |
| THD | –80 dBc at 1 MHz, 2 VPP, G = 2 - meets broadcast-grade video distortion requirements per NTSC/PAL standards |
Pinout & Package
THS3122IDDA uses the HSOP-8 PowerPAD™ (DDA) package: 4.89 mm × 3.90 mm body with exposed thermal pad on underside, requiring solder connection to PCB ground plane for thermal management (θJA = 67°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node (1.5 MΩ) for reference-side signal injection; common-mode range extends to ±12.7 V at ±15 V supply |
| 1 IN− | Inverting input, Channel 1 | Low-impedance current-summing node (15 Ω); sets gain via external RF resistor; sensitive to layout parasitics |
| 1 OUT | Output, Channel 1 | Capable of ±450 mA into 50 Ω; requires local 0.1-µF bypass capacitor and Kelvin return path for stability |
| VCC− | Negative power supply | Must be decoupled with ≥1 µF ceramic + 10 µF tantalum; connects to system ground plane via shortest possible path |
| N/C | No internal connection | Pins 5, 7, 8, and 10 are unconnected die pads - must remain floating or grounded per layout guidelines; no routing allowed |
| REF | Reference pin (THS3125 only) | Not connected internally in THS3122IDDA - left unconnected or tied to GND; unused function per device variant |
| VCC+ | Positive power supply | Requires symmetric decoupling to VCC−; mismatch >0.3 V risks CMRR degradation and offset drift |
| 2 OUT | Output, Channel 2 | Independent output stage; crosstalk to Channel 1 is –67 dBc at 1 MHz - sufficient for dual-channel scope front-ends |
| 2 IN− | Inverting input, Channel 2 | Electrically isolated from Channel 1 inputs; shares same bias current specs (2–22 µA) but independent offset matching |
| 2 IN+ | Noninverting input, Channel 2 | Matches Channel 1 IN+ in impedance and common-mode range; channel offset voltage matching ≤4 mV over temperature |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback topology | Enables constant bandwidth across gains (e.g., 126–128 MHz from G = 1 to G = 2), eliminating gain-bandwidth trade-off in video gain blocks |
| 450-mA output drive | Drives 50-Ω transmission lines directly without external buffers, reducing component count in high-speed analog interconnects |
| 2.2-nV/√Hz input voltage noise | Preserves dynamic range in 12-bit+ data acquisition front-ends where amplifier noise dominates total system noise floor |
| –80 dBc THD @ 1 MHz | Meets SMPTE 253M video spec for differential gain/phase error (<0.01%/0.011°) in broadcast camera signal paths |
| Industrial temperature grade | Specified performance maintained from –40°C to +85°C - validated for use in motor drive current sensing and PLC analog I/O modules |
Applications
| Video Distribution | Instrumentation Amplification |
|---|---|
Use Scenario: Driving four 75-Ω serially terminated SD/HD video lines from a single source in broadcast switchers or medical imaging displays. IC Role / Device Role / Timing Role: Dual-channel current feedback amplifier providing matched gain, phase, and drive strength for parallel video paths. Use Value: Achieves <0.01% differential gain error and <0.011° phase error at NTSC/PAL frequencies - eliminates color shift and timing skew across outputs. |
Use Scenario: High-speed, low-noise amplification of bridge sensor outputs (e.g., load cells, strain gauges) in automated test equipment. IC Role / Device Role / Timing Role: Precision gain block with 2.2-nV/√Hz noise floor and 128-MHz bandwidth for settling sub-µs step responses. Use Value: Enables 16-bit resolution at 100-kSPS sampling rates by limiting amplifier contribution to <1 LSB noise in 10-V full-scale range. |
| Piezo Actuator Driving | Line Driver for Industrial Bus |
Use Scenario: Generating high-voltage, high-slew-rate waveforms to drive piezoelectric transducers in ultrasonic cleaning or precision positioning stages. IC Role / Device Role / Timing Role: Wide-swing current source delivering ±13.3 V into 50 Ω with 1550-V/µs slew rate for nanosecond-rise pulses. Use Value: Supports 20-kHz resonant drive with <1% harmonic distortion - avoids mechanical resonance excitation and improves positioning accuracy. |
Use Scenario: Boosting analog signals onto long industrial cables (e.g., 4–20 mA loop drivers, analog fieldbus nodes) subject to EMI and capacitive loading. IC Role / Device Role / Timing Role: Robust line driver with 450-mA short-circuit current and 14-Ω output impedance for impedance-matched termination. Use Value: Maintains signal integrity up to 10 MHz over 100-m cable runs with <0.1 dB gain flatness - reduces need for repeaters or equalization. |
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); θJA = 95°C/W vs. 67°C/W for DDA; no PowerPAD thermal enhancement | Limited to commercial temperature range (0°C to +70°C); unsuitable for industrial ambient or high-power-density PCBs | Select THS3122CD only for cost-sensitive, low-ambient-temperature consumer applications with adequate airflow. |
| THS3092ID | Voltage-feedback architecture; lower 1.3-nV/√Hz noise but 220-MHz GBW; max output current 250 mA; no PowerPAD option | Better DC precision (±1 mV VIO) but lower drive capability; cannot replace THS3122IDDA in 50-Ω video or piezo loads | Choose THS3092ID when ultra-low noise and high DC accuracy outweigh drive strength - e.g., photodiode transimpedance with 1-GΩ feedback. |
Compared with THS3122CD, THS3122IDDA offers superior thermal performance and industrial temperature rating; compared with THS3092ID, it delivers 80% higher output current and current-feedback bandwidth stability, making it irreplaceable in high-drive, high-fidelity analog signal routing.
Availability
THS3122IDDA is available at Aetrix Electronics and suitable for video distribution systems, industrial instrumentation, piezo actuator control, and high-speed line driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS3122IDDA 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 signal chain solutions.
The THS3122IDDA belongs to TI's THS312x family of low-noise, high-output-current current feedback amplifiers, designed specifically for demanding analog signal conditioning in video, instrumentation, and industrial actuation systems.
FAQ
What is the maximum safe output current for THS3122IDDA?
The THS3122IDDA is rated for ±450 mA peak output current per channel into resistive loads. Absolute maximum ratings specify 550 mA, but sustained operation above 450 mA risks thermal overload unless PCB thermal design meets θJA ≤ 67°C/W via PowerPAD soldering to a solid ground plane. Derating is required above +70°C ambient.
Does THS3122IDDA include a shutdown function?
No. The THS3122IDDA does not implement shutdown functionality - that feature is exclusive to the THS3125 variant (e.g., THS3125IDDA). Pin 6 (REF) and Pin 9 (SHUTDOWN) are no-connect (N/C) in THS3122IDDA and must remain unconnected or grounded; applying voltage to these pins has no effect on operation.
What is the recommended feedback resistor value for G = 2 with THS3122IDDA?
For G = 2 in inverting configuration, TI specifies RF = 470 Ω with RL = 50 Ω to achieve 128-MHz –3-dB bandwidth and –80 dBc THD at 1 MHz. Using RF = 500 Ω or 430 Ω shifts bandwidth by ±5 MHz but maintains stability; values outside 430–500 Ω risk peaking or reduced slew rate due to stray capacitance interaction.
Can THS3122IDDA drive a 75-Ω load directly?
Yes. THS3122IDDA delivers ±26 VPP into 50 Ω and maintains <0.01% differential gain error into 75-Ω serially terminated video loads. For 75-Ω operation, configure as unity-gain follower with 75-Ω series output resistor and 75-Ω termination at load - verified in TI's THS3122EVM test reports.
Is THS3122IDDA pin-compatible with THS3122CD?
Yes - THS3122IDDA (HSOP-8 PowerPAD) and THS3122CD (SOIC-8) share identical pin numbering and electrical functions. However, the DDA package's exposed thermal pad requires dedicated PCB footprint and solder stencil design; mechanical mounting and thermal vias differ significantly despite identical pinout.
THS3122IDDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
THS3122IDDA FAQ
1.How can I place an order for THS3122IDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3122IDDA 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 THS3122IDDA reliable?
The price and inventory of THS3122IDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122IDDA is usually 5 days.
3.What payment methods are accepted for THS3122IDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122IDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3122IDDA?
THS3122IDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3122IDDA 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 THS3122IDDA?
For technical support, including THS3122IDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122IDDA requirements.
6.How does Aetrix verify that THS3122IDDA is sourced from the original manufacturer or authorized distributors?
All THS3122IDDA 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 THS3122IDDA meets industry standards.
7.What is the process for return or replacement of THS3122IDDA?
All THS3122IDDA units undergo pre-shipment inspection (PSI). If there is an issue with THS3122IDDA, 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 THS3122IDDA part is unused and in its original packaging.
Return procedure for THS3122IDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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