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Texas Instruments THS3122CDR
- Part No.:
- THS3122CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3122CDR.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
THS3122CDR 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), 1550-V/µs slew rate (G = 2), and ultra-low 2.2-nV/√Hz voltage noise - enabling precise video distribution and instrumentation-grade line driving.
For engineers reviewing the THS3122CDR datasheet, THS3122CDR pinout, THS3122CDR application, or THS3122CDR equivalent, key selection criteria include its SOIC-8 package compatibility, ±5 V to ±15 V dual-supply operation, low distortion at 2 VPP (–80 dBc), and absence of shutdown functionality - distinguishing it from the THS3125 variant.
Technical Context
The THS3122CDR implements a current feedback architecture with transimpedance gain stage, enabling wide bandwidth independent of closed-loop gain. Its bipolar input stage provides symmetrical input bias currents (2 µA typical IN+, 23 µA typical IN−) and supports ±12.7 V common-mode input range at ±15 V supply.
It features matched channel offset voltage (≤3 mV typ), 62 dB CMRR at ±15 V, and 14 Ω open-loop output resistance - optimized for driving 50 Ω and 75 Ω transmission lines while maintaining <0.01% differential gain error in NTSC/PAL video applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at RL = 50 Ω, RF = 470 Ω, G = 2 - supports full HD video baseband signals without attenuation |
| Slew Rate | 1550 V/µs at G = 2, RL = 50 Ω - enables clean 20-MHz square wave reproduction with minimal edge distortion |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level sensor signal amplification paths |
| Output Current | 450 mA per channel - drives four 75-Ω serially terminated video lines simultaneously |
| Supply Range | ±5 V to ±15 V dual supply - accommodates legacy industrial and broadcast equipment rails |
| THD @ 1 MHz | –80 dBc at 2 VPP - meets broadcast-grade video distortion requirements for differential gain/phase |
| Input Offset Voltage | ±20 mV max at +25°C - ensures DC-coupled accuracy in precision instrumentation front-ends |
Pinout & Package
THS3122CDR is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm) with exposed PowerPAD thermal pad on underside - requires PCB copper pour connection for thermal management per TI SLMA002 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node (1.5 MΩ) for signal source connection; referenced to VCC− |
| 1 IN− | Inverting input, Channel 1 | Low-impedance current-summing node (15 Ω); sets closed-loop gain with feedback resistor |
| 1 OUT | Output, Channel 1 | Capable of ±13.3 V swing into 50 Ω; delivers up to 450 mA into heavy loads |
| VCC− | Negative power supply | Must be connected to stable low-impedance rail; supplies internal bias circuitry |
| VCC+ | Positive power supply | Accepts up to ±15 V; quiescent current per channel is 8.4 mA at ±15 V |
| 2 IN+ | Noninverting input, Channel 2 | Independent high-Z input identical to Pin 1 IN+; enables dual-path signal processing |
| 2 IN− | Inverting input, Channel 2 | Independent low-Z summing node identical to Pin 2; isolated from Channel 1 |
| 2 OUT | Output, Channel 2 | Fully independent output with same drive capability and noise performance as Channel 1 |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback topology | Enables constant bandwidth across gain settings - unlike voltage-feedback op-amps where BW drops with gain |
| Bipolar input stage | Delivers matched input bias current tracking and low input capacitance (2 pF) for high-frequency stability |
| PowerPAD thermal enhancement | Reduces θJA to 95°C/W (SOIC-8), allowing sustained 450-mA output current without thermal shutdown |
| Dual-channel isolation | Channel-to-channel crosstalk ≤ –67 dBc at 1 MHz - preserves signal integrity in multi-channel video routing |
| Video-optimized distortion | Differential gain/phase error < 0.01% / 0.011° at NTSC/PAL - eliminates color fidelity loss in analog video systems |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Distributing composite video signals to multiple monitors or recording devices in broadcast infrastructure. IC Role / Device Role / Timing Role: Dual-channel current feedback amplifier configured as unity-gain buffer with 75-Ω back-termination. Use Value: Maintains <0.01% differential gain error and –80 dBc THD at 1 MHz, preserving color fidelity across all outputs. | Use Scenario: Amplifying low-level sensor outputs (e.g., strain gauge bridges) before ADC sampling in test equipment. IC Role / Device Role / Timing Role: High-speed, low-noise gain stage with DC-coupled inputs and rail-to-rail output swing capability. Use Value: 2.2-nV/√Hz voltage noise and ±12.7-V input common-mode range enable sub-mV signal resolution at bandwidths up to 128 MHz. |
| High-Speed Line Driving | Piezo Actuator Control |
Use Scenario: Driving long coaxial cables (e.g., 100 m RG-59) in automated test systems requiring fast step response. IC Role / Device Role / Timing Role: Low-output-impedance driver (14 Ω open-loop) with 1550-V/µs slew rate and 450-mA peak current. Use Value: Delivers clean 10-V step transitions with <64 ns settling time to 0.1%, minimizing inter-symbol interference. | Use Scenario: Generating high-voltage, high-slew-rate drive signals for piezoelectric positioning stages in semiconductor metrology tools. IC Role / Device Role / Timing Role: Voltage-controlled current source delivering up to ±13.3 V into capacitive piezo loads (nF range). Use Value: 128-MHz bandwidth and 450-mA output current enable nanosecond-scale position settling without resonance excitation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3122IDR | Same electrical specs; rated for –40°C to +85°C industrial temperature range vs. THS3122CDR's 0°C to +70°C | Required for outdoor or factory-floor deployments where ambient exceeds 70°C | Select THS3122IDR when extended temperature operation is mandatory; otherwise THS3122CDR suffices for commercial environments. |
| THS3125CDR | Includes SHUTDOWN pin and REF pin; shutdown quiescent current drops to 370 µA vs. THS3122CDR's fixed 8.4 mA/channel | Used in battery-powered or power-gated systems needing dynamic power control | Choose THS3125CDR only if active power-down capability is required; THS3122CDR offers simpler interface and identical AC performance. |
Compared with THS3122IDR, THS3122CDR trades industrial temperature range for lower cost and qualification scope; compared with THS3125CDR, it eliminates shutdown complexity while retaining identical bandwidth, noise, and drive strength - making it optimal for always-on, space-constrained video and instrumentation designs.
Availability
THS3122CDR is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, and high-speed line driving requiring stable component supply, consistent SOIC-8 packaging, and guaranteed TI production lifecycle support.
Supply support for THS3122CDR 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 amplifiers and precision signal chains.
The THS3122CDR belongs to TI's THS312x current feedback amplifier family, engineered specifically for low-distortion, high-output-current analog signal routing in broadcast video, test equipment, and industrial motion control systems.
FAQ
What is the maximum supply voltage for THS3122CDR?
The THS3122CDR supports dual-supply operation from ±5 V to ±15 V, with absolute maximum rating of 33 V between VCC+ and VCC−. Exceeding ±15 V risks permanent damage per Absolute Maximum Ratings table. Operation at ±15 V delivers full 128-MHz bandwidth and 1550-V/µs slew rate - verified in TI SLOS382E Rev E test conditions.
Does THS3122CDR have a shutdown function?
No, THS3122CDR does not include shutdown functionality. The SHUTDOWN and REF pins present on the THS3125 variant are N/C (no internal connection) on THS3122CDR. This simplifies system design by eliminating control logic but means quiescent current remains fixed at 8.4 mA per channel under all operating conditions.
What package type is used for THS3122CDR?
THS3122CDR uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with an exposed PowerPAD thermal pad on the underside. This package requires soldering the PowerPAD to a PCB copper pour for effective heat dissipation - critical to sustain 450-mA output current without exceeding 150°C junction temperature.
Can THS3122CDR drive 50-Ω loads effectively?
Yes, THS3122CDR is explicitly characterized for 50-Ω loads: it delivers 128-MHz bandwidth, –80 dBc THD at 2 VPP, and 26-VPP output swing into 50 Ω. Its 14-Ω open-loop output resistance and 450-mA current capability ensure stable operation with minimal peaking or ringing - validated in TI's SLOS382E Figure 26 and Table 7.8.
How does THS3122CDR differ from THS3125CDR?
THS3122CDR and THS3125CDR share identical AC performance (bandwidth, slew rate, noise, distortion) and pin-compatible SOIC-8 layout, but THS3125CDR adds SHUTDOWN and REF pins for power gating. THS3122CDR omits these pins (N/C), resulting in simpler biasing, no shutdown timing constraints, and fixed 8.4-mA quiescent current - making it preferable for always-on applications.
THS3122CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3122CDR FAQ
1.How can I place an order for THS3122CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3122CDR 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 THS3122CDR reliable?
The price and inventory of THS3122CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122CDR is usually 5 days.
3.What payment methods are accepted for THS3122CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3122CDR?
THS3122CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3122CDR 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 THS3122CDR?
For technical support, including THS3122CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122CDR requirements.
6.How does Aetrix verify that THS3122CDR is sourced from the original manufacturer or authorized distributors?
All THS3122CDR 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 THS3122CDR meets industry standards.
7.What is the process for return or replacement of THS3122CDR?
All THS3122CDR units undergo pre-shipment inspection (PSI). If there is an issue with THS3122CDR, 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 THS3122CDR part is unused and in its original packaging.
Return procedure for THS3122CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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