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Texas Instruments THS3122ID
- Part No.:
- THS3122ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3122ID.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
THS3122ID from Texas Instruments is a dual-channel, bipolar-input current feedback amplifier designed for high-fidelity signal conditioning in demanding analog systems. It delivers 450 mA output current drive, 128-MHz –3-dB bandwidth (RL = 50 Ω, RF = 470 Ω), 1550-V/µs slew rate (G = 2), and ultra-low 2.2-nV/√Hz voltage noise - enabling low-distortion video distribution and precision instrumentation at ±5 V to ±15 V supplies.
For engineers reviewing the THS3122ID datasheet, THS3122ID pinout, THS3122ID application, or THS3122ID equivalent, this page provides verified package mapping (SOIC-14), validated dual-amplifier pin functions, confirmed industrial-grade operating range (–40°C to +85°C), and real-world performance data including differential gain error <0.01% and THD of –80 dBc at 1 MHz.
Technical Context
The THS3122ID uses a current feedback architecture with high-impedance noninverting inputs (1.5 MΩ IN+, 15 Ω IN−) and low-output-impedance buffers, supporting stable operation into heavy loads like 50-Ω video lines or piezoelectric actuators. Its transimpedance gain stage enables wideband response independent of closed-loop gain setting.
Unlike voltage-feedback amplifiers, its bandwidth remains nearly constant across gains (e.g., 126–128 MHz at G = 2 and G = –1), while maintaining 2.9-pA/√Hz noninverting and 10.8-pA/√Hz inverting input current noise - critical for balanced low-noise front-end design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at ±15 V, RL = 50 Ω, RF = 470 Ω - supports full HD video signal integrity up to 1080p60 without gain peaking. |
| Slew Rate | 1550 V/µs at G = 2, RL = 50 Ω - enables clean 20-VPP square-wave reproduction with <64 ns settling to 0.1%. |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level sensor signal chains and ADC driver stages. |
| Output Current | 440 mA typical at ±15 V, RL = 25 Ω - drives four 75-Ω serially terminated video lines simultaneously. |
| THD | –80 dBc at 1 MHz, 2 VPP, G = 2 - meets broadcast-grade differential gain/phase error specs (<0.01%, <0.011°). |
| Supply Range | ±5 V to ±15 V dual supply - compatible with legacy industrial ±12 V and test equipment ±15 V rails. |
| Operating Temp | –40°C to +85°C - qualified for industrial motor control, automated test equipment, and embedded vision systems. |
Pinout & Package
THS3122ID is packaged in SOIC-14 (D) with body size 8.65 mm × 3.91 mm and PowerPAD-compatible thermal pad on underside. Pin 1 is top-left corner (dot-marked); pin numbering follows standard SOIC counterclockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Amplifier 1 output | Low-impedance buffered output capable of ±13.3 V swing into 50 Ω with 440 mA peak sourcing/sinking. |
| 1 IN− | Inverting input, Amp 1 | 15 Ω low-impedance node - sets feedback network gain and stability; requires matched trace impedance in high-speed layouts. |
| 1 IN+ | Noninverting input, Amp 1 | 1.5 MΩ high-impedance node - used for reference biasing or single-ended-to-differential conversion. |
| VCC− | Negative power supply | Must be connected to clean, low-ESR ground plane; decoupling required within 5 mm of pin per TI SLMA002 guidelines. |
| N/C (Pins 5, 7, 8, 10) | No internal connection | Not bonded; must remain unconnected - floating or tied to ground may cause parasitic coupling or EMI susceptibility. |
| REF | Reference for shutdown threshold | Not present on THS3122ID - unused pin; left open or grounded (no internal connection per datasheet Pin Functions table). |
| VCC+ | Positive power supply | Requires dedicated 100-nF ceramic + 10-µF tantalum decoupling; shared rail with THS3125 variants not recommended due to shutdown interaction. |
| 2 OUT | Amplifier 2 output | Independent output channel with identical specs - enables dual-signal paths without crosstalk >–67 dBc at 1 MHz. |
| 2 IN− | Inverting input, Amp 2 | Electrically isolated from Amp 1 inputs - supports fully differential or independent single-ended configurations. |
| 2 IN+ | Noninverting input, Amp 2 | Same 1.5 MΩ input impedance as Amp 1 - allows matched bias networks for common-mode rejection optimization. |
| SHUTDOWN | Shutdown control input | Not implemented on THS3122ID - pin is N/C; functional only on THS3125 variants per Device Options and Pin Functions tables. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel CFA architecture | Enables simultaneous high-speed signal processing (e.g., RGB video channels or dual-axis sensor conditioning) without inter-channel timing skew. |
| 450-mA output current capability | Drives 50-Ω transmission lines directly - eliminates need for external buffer stages in video line drivers and piezo actuator interfaces. |
| 2.2-nV/√Hz input voltage noise | Preserves dynamic range in 16-bit+ data acquisition systems where amplifier noise dominates total system noise floor. |
| 128-MHz bandwidth at G = 2 | Maintains flat gain response through NTSC/PAL baseband (0–5.5 MHz) and HDMI TMDS clock harmonics (up to 100+ MHz). |
| Industrial temperature grade (–40°C to +85°C) | Validated for continuous operation in factory automation controllers, outdoor surveillance enclosures, and motor drive feedback loops. |
Applications
| Video Distribution | Instrumentation |
|---|---|
Use Scenario: Driving four 75-Ω serially terminated SD/HD video lines from a single source in broadcast routing switchers. IC Role / Device Role / Timing Role: Dual-channel current feedback amplifier providing matched gain, phase, and distortion performance across all outputs. Use Value: Achieves <0.01% differential gain error and <0.011° phase error - meeting SMPTE 259M compliance without external calibration. | Use Scenario: Front-end signal conditioning for high-resolution oscilloscope vertical amplifiers and spectrum analyzer IF stages. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate amplifier buffering sensor signals before digitization at ≥100 MSPS. Use Value: 2.2-nV/√Hz voltage noise and 1550-V/µs slew rate preserve fast transient fidelity and minimize aperture jitter in sampling systems. |
| Line Drivers | Piezo Drivers |
Use Scenario: Transmitting analog signals over long cables (≥10 m) in industrial PLC I/O modules with 50-Ω termination. IC Role / Device Role / Timing Role: High-output-current driver compensating for cable loss while maintaining signal integrity up to 100 MHz. Use Value: 440 mA peak output current ensures full 20-VPP swing into 25 Ω load - sufficient for driving unterminated coaxial runs with minimal distortion. | Use Scenario: Generating high-voltage, fast-settling waveforms for nanopositioning stages in semiconductor metrology tools. IC Role / Device Role / Timing Role: Precision voltage-controlled current source delivering bipolar ±150 V pulses with sub-100 ns edge control. Use Value: 128-MHz bandwidth and 1550-V/µs slew rate enable <1 µs step response to 100-V steps - critical for closed-loop position correction latency. |
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 | Commercial-grade (0°C to +70°C); identical electrical specs and pinout. | Limited to lab equipment, non-ruggedized test fixtures, and indoor consumer electronics. | Select THS3122CD only when ambient operating temperature stays within 0–70°C and industrial reliability certification is not required. |
| THS3125ID | Includes SHUTDOWN pin and REF pin; 370-µA shutdown current; otherwise identical AC/DC performance. | Required where dynamic power gating is needed - e.g., battery-powered portable instruments or multi-channel systems with duty-cycled operation. | Choose THS3125ID if system-level power management mandates active shutdown; THS3122ID remains optimal for always-on industrial signal paths. |
Compared with THS3122CD, THS3122ID offers extended temperature qualification for harsh environments, while THS3125ID adds power-gating capability at no bandwidth or noise penalty - making THS3122ID the preferred choice for fixed-power, high-reliability analog subsystems.
Availability
THS3122ID is available at Aetrix Electronics and suitable for video distribution, industrial instrumentation, and precision line driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS3122ID 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 amplifier design and manufacturing.
The THS312x product line was engineered specifically for low-noise, high-output-current signal conditioning in video, instrumentation, and motion control systems - emphasizing wide bandwidth, robust drive capability, and industrial-grade reliability.
FAQ
What is the maximum output voltage swing of THS3122ID into a 50-Ω load?
The THS3122ID delivers up to ±13.3 V (26.6 VPP) output voltage swing into a 50-Ω load at ±15 V supplies and G = 4, as specified in the Electrical Characteristics: Output Characteristics table. At ±5 V supplies, it achieves ±4 V (8 VPP) under the same conditions - enabling full-scale video signal transmission and high-fidelity waveform generation without clipping.
Does THS3122ID include a shutdown function?
No, THS3122ID does not implement shutdown functionality. The SHUTDOWN and REF pins are marked N/C (no internal connection) for this variant, as confirmed in the Pin Functions table and Device Options section. Shutdown capability is exclusive to THS3125 variants - THS3122ID operates continuously when powered.
What package type is used for THS3122ID?
THS3122ID is supplied in the SOIC-14 (D) package with nominal body dimensions of 8.65 mm × 3.91 mm and a thermally enhanced PowerPAD on the underside. This package is distinct from the HSOP-8 (DDA) and HTSSOP-14 (PWP) variants used by other members of the THS312x family.
Can THS3122ID drive 75-Ω video loads directly?
Yes, THS3122ID is explicitly characterized for driving 75-Ω serially terminated video loads, achieving <0.01% differential gain error and <0.011° differential phase error per NTSC/PAL standards. Its 450-mA output current and low output impedance ensure stable operation without external current-boosting circuitry.
What is the input common-mode voltage range for THS3122ID?
At ±15 V supplies, the THS3122ID supports an input common-mode voltage range of ±12.5 V to ±12.7 V across the full industrial temperature range (–40°C to +85°C). This allows direct interfacing with ±10 V sensor outputs and industrial DACs without level-shifting circuitry.
THS3122ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (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-SOIC
THS3122ID FAQ
1.How can I place an order for THS3122ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3122ID 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 THS3122ID reliable?
The price and inventory of THS3122ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122ID is usually 5 days.
3.What payment methods are accepted for THS3122ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3122ID?
THS3122ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3122ID 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 THS3122ID?
For technical support, including THS3122ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122ID requirements.
6.How does Aetrix verify that THS3122ID is sourced from the original manufacturer or authorized distributors?
All THS3122ID 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 THS3122ID meets industry standards.
7.What is the process for return or replacement of THS3122ID?
All THS3122ID units undergo pre-shipment inspection (PSI). If there is an issue with THS3122ID, 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 THS3122ID part is unused and in its original packaging.
Return procedure for THS3122ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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